Printing canvas (options), compressible fabric, composite product, the method of manufacturing a compressible fabric, a method of manufacturing a printing blanket, a method of obtaining a composite material


B41D7/04 - Forming printing surfaces by covering printing forms with a thin elastic skin, e.g. rubber foil, and retaining the latter thereon; Obtaining reduced or enlarged printing surfaces by using thin elastic transfer foils (pantographic instruments for copying, reducing, or enlarging B43L0013100000)

 

(57) Abstract:

Laminated compressible offset printing fabric for use in offset printing contains in order: first compressible layer fabric, compressible elastomeric layer, at least two additional layers of fabric, placed above the compressible elastomeric layer, the elastomeric underlayer and an elastomeric printing face coating without the use of solvents and having a surface profile adapted to reduce the increase point size by increasing otdelimosti printed material. At least the bottom layer of fabric includes a protective coating to prevent the influx of printing inks, water and/or solvents in printing canvas. In addition, the cloth layer, and a compressible layer at least partially covered with a matrix material having dispersed in it a multitude of closed cells formed by, for example, by using a pore or the introduction of many advanced or capable of expanded microspheres. Products, which can also be formed from this composite structures include gaskets, packing materials, flexible membrane or printed sew the physical properties of the fabric, compressible fabric and composite products. 7 C. and 80 C.p. f-crystals, 4 Il.

The invention relates to offset printing, and more particularly, to a compressible offset printing canvas, and to methods for their manufacture for use in offset printing machines. The invention also relates to compressible woven substrates, and particularly, to those which contain a multitude of closed cells for use in offset printing canvases and other composite structures, for example, gaskets, packaging materials, flexible membranes, etc.

The use of so-called "printing blankets in offset lithography is well known for a number of years. In offset lithographic printing drum of a rotary printing machine cover printed form, with an area of printing elements of a positive, receptive to oil printing inks and snow water, and the area of the printing elements of the background to which the opposite is true assertion. The printed form is rotated so that its surface is in contact with the second drum, covered with printing canvas with a rubber surface receptive to printing inks. Printing ink presented on the surface Then be printed to paper or other sheet workpiece is passed between the drum, covered with offset blade, and a rigid supporting the drum for transferring the image from the surface of the blanket to the paper.

During the stages in which the image is transferred from the printing plate on an offset blade and subsequently, when the image is transferred from the printing blanket to the paper, it is important to ensure close contact between the two contacting surfaces. This is usually reached by placing the drum, covered with offset blade, and a support drum so that between them there was a constant mutual influence. Thus, the offset of the canvas within the print loop is compressed at a constant depth, as a rule, approximately a 0.002-0.006 in. Also is important that the pressure is spread evenly across the canvas.

This constant mutual influence between offset canvas and paper substrate may be provided, for example, by inserting one or more thin layers of paper or similar offset between the blade and the drum surface for increasing the thickness of the blanket.

First printing blanket used in the operations of rotary printing machines, consisted of the reference layer woven substrate connected to the first offset paintings came from the fact that the rubber is incompressible. Thus, when an incompressible rubber surface applied pressure, the rubber will warp and cause rough running waves in the zone of compression, that is, at a point between the printing medium and the drum recess. Such mounting will cause bleeding of the printed ink and the compression textile lining. In addition, the re-compression of the rubber blankets during surgery tend to cause permanent indentations in offset canvas and premenopausal damage textile lining.

Are the further development of compressible blankets in an attempt to solve many of the problems mentioned above. Currently, the compressible blanket, as a rule, consist of a base multilayer woven substrate with a compressible porous layer or layers and vulcanised elastomeric outer coating.

Subsequent improvements in printing blankets have so far been aimed at the achievement of the required properties of the bulk compressibility, lateral resistance to warping and sufficient hardness, that is, the elasticity to regain form after use. layers of material with an adhesive, each layer has one or more of the desired properties. Typically, the layer of solid, do not possess the ability to stretch woven material, used to provide resistance peripheral and lateral warping blanket. Compressibility and elasticity was achieved by selecting layers possessing these properties in the design of the blanket.

Known printed blanket, as a rule, include multilayer woven base and vulkanisierung elastomeric face covering. To increase the compressibility of such blankets preferably, one or more cellular layer (layers) can be formed (or attached to the fabric between the base and an elastomeric outer surface of the blanket. Such compressible layers can be formed, for example, with many, either open (for example, U.S. patent 4442895 issued Shimura) or closed (U.S. patent 4042743 issued to Larsen) cellular structures, distributed in the elastomeric matrix. In the patent Larsen, for example, the compressible layer is placed between one or more layers of fabric. The compressible layer is produced by introduction of the elastomer polymer microspheric getcontainer in the relevant proportion of the covered cells.

Another way to obtain rubber with closed or partially closed cells containing microspherical getcontainer, is described in U.S. patent 3219600 issued to Rucker.

Such applications microspheric getcontainer or hollow microspheres in the compressible layer of the printing blanket are described in U.S. patents 3700541 issued to Shrimpton and others, and 3983287 issued to Goossen, etc. In these patents hollow microspherical getcontainer embedded in an elastic polymer or etc., to form a compressible elastomeric sheet for use as an intermediate layer in the process of printing the canvas.

Liquefied layers of the above described type are particularly useful to prevent distortion of the fingerprint, i.e. the lack of clarity caused by the displacement/deformation, which otherwise often occurs on the printing surface of the blanket adjacent the compression zone of the printing machine. Compressible layer also serves to absorb the effect of "destruction", which is defined as a significant deformation of the blanket due to a temporary increase in the thickness of the printing material, for example, the accidental introduction of more than one sheet of paper between the printing medium and the reference is estom deficiencies which adversely affect their durability and print quality. For example, they are sensitive to the reduction of thickness due to the residual strain during compression of one or more of the following items: fabrics (tissues) used for formation of the base layer (layers), elastomeric compounds used for the formation of the front cover and, if used, layers of glue to connect adjacent sections blanket, and/or in the case of compressible blankets, compressible matrix. In addition, the printing blanket of the type indicated above is often also suffer from capillary penetration of printing ink, water and solvents commonly used in the printing machine through either bare edges of the slice blankets or, for example, if these edges are protected by applying a sealant directly through the cracks in the offset of the canvas or the lower layer of fabric.

In addition, offset canvases with porous compressible layer, a compressible layer, generally have lower single layer of fabric or directly below the elastomeric printed cover. In this arrangement the compressible layer is subjected to high stresses occurring on adjacent printed front cover of the s flowing through the cells in them.

In addition, the elastomeric printed front surface offset in the paintings of the prior art, normally carried out by using a known method is applied using a squeegee, in which the material of the front cover is first dissolved in an organic solvent prior to its deposition on the layer of fabric or compressible layer. However, such organic solvents require subtle adjustments to the environment to ensure the safety of their use in the workplace.

In addition, the printing blanket of the prior art often have surface profiles on their elastomeric printing face coatings that do not meet the condition acceptable balance between print quality provided by this surface, and its ability to separation from the printed workpiece in preparation for the next print of the print drum.

From U.S. patent N 3147698 known printing canvas, containing having multiple fibers or warp and weft threads forming the substrate, a compressible layer of fabric, elastomeric printing face covering and located between the compressible layer, the binder material which impregnates meanly and, as well as printing fabric containing elastomeric printing face covering.

In addition, in this patent is disclosed compressible fabric containing multiple fibers, or the warp and weft threads forming the substrate fabric, and impregnating her matrix material containing many cells in a quantity sufficient to impart fabric of high compressibility, as well as composite article containing a compressible fabric and at least one additional layer or coating to give the product the desired properties.

From U.S. patent N 4770928 known method of manufacturing a compressible tissue, which form the matrix material having a multitude of cells, causing the matrix material to the substrate fabric containing multiple fibers or threads of the warp and weft for environment and soaking essentially all fibers, yarns and magdowski matrix material to impart fabric of high compressibility, and utverjdayut the matrix material to obtain a compressible fabric, a method of manufacturing a printing blanket, wherein forming the layer of compressible tissue associated with the compressible layer and the printing face covering, and a method of obtaining a composite material, containing at least the practical properties of the material to the substrate fabric is applied to the matrix material, contains many cells for impregnation of the substrate fabric.

These products and methods for their manufacture are also inherent in the above disadvantages.

The basis of the invention is to create such a printing blanket, compressible fabric, composite products and methods of their manufacture, which would overcome the shortcomings of the blankets of the prior art.

This task according to one aspect of the present invention is solved by a process of printing fabrics, containing having multiple fibers or warp and weft threads forming the substrate, a compressible layer of fabric, elastomeric printing face covering and located between the compressible layer, the binder material which impregnates the substrate fabric and contains many cells in a quantity sufficient to impart fabric of high compressibility, which according to the invention the material of the binder impregnates at least one side of the backing fabric from the partial impregnation, and the thickness of the saturated part of the substrate, essentially equal to the thickness of the covered portion of the substrate.

It is advisable that the canvas is additionally contained sublayer replicaomega high hardness, high tensile strength and low elongation.

Preferably, the canvas additionally contain at least two layers of fabric between the compressible layer and the elastomeric printing face coating to protect the compressible layer from at least part of the stress occurring on the printed front surface.

It is desirable that the elastomeric front cover had the profile of a surface with an average roughness of 0.6-0.95 microns.

It is useful to elastomeric face coating had a surface with an average roughness of 0.7-0.9 ám.

It is possible that at least one of the layers was the base layer of tissue, which further comprises a protective coating to prevent absorption and flowing water through it, printing inks and solvents.

Valid to at least one of the layers of tissue contained numerous fibers or warp and weft threads forming the substrate fabric and the material of the binder, impregnating, essentially, at least one side of the substrate fabric, and the thickness of the partially impregnated substrate fabric was essentially equal to the thickness of the untreated substrate fabric, the material of the binder contained numerous cells in to the on or the warp had a tensile strength of at least 150 pounds per inch, fibers or filaments duck had a tensile strength of at least 60 pounds per inch, and the substrate fabric had a weight of 4 to 8 ounces per square yard.

Preferably, the compressible layer consisted of a matrix having a multitude of closed cells distributed essentially uniformly in it to give a layer of essentially uniform compression characteristics.

It is desirable that the matrix was a thermoplastic or elastomeric material.

It is useful to canvas additionally contain a protective coating on a compressible layer of fabric to prevent absorption and flowing water through it, printing inks and solvents.

It is possible that the protective coating contains a fluorocarbon or silicone material.

Valid that cells were formed from microspheres having a diameter of 1-200 μm, which are relatively uniformly dispersed in the binder material in the matrix or matrix material.

It is advisable that the microspheres were formed from a material selected from the group consisting of thermoplastic resins, thermosetting resins, ceramics, glass and sintered metals.

Preferably, the microspheres contained surface on the nutrient, in order microspheres were represented in the material of the binder in the matrix or matrix material during the filling of 4-90% of the dry weight of these materials.

It is useful to have cells were formed from gas bubbles trapped material, a binder, a matrix or matrix material.

It is possible that the material of the binder or matrix material was thermoplastic resin, thermosetting resin, polyurethane synthetic or natural elastomer.

Allow the elastomer was a nitrile, neoprene or acrylic elastomer.

It is advisable that the microspheres were made from phenolic resin and had diameters 50-130 μm.

This task according to another aspect of the present invention is solved by a process of printing fabrics, containing elastomeric printing face covering, which, according to the invention, the elastomeric printing face covering has a surface profile with an average roughness of 0.6 - 0.95 microns to increase otdelimosti when the dot size when printing.

It is advisable that the canvas additionally contain at least one fabric layer and the compressible layer below the printed face is covered with the front cover, moreover, the underlayer was formed from elastomeric compounds with high hardness, high tensile strength and low elongation.

It is desirable that the canvas additionally contain at least two layers of fabric between the compressible layer and the elastomeric printing face coating to protect the compressible layer from at least part of the stress occurring on the printed front surface.

It is useful to elastomeric face coating had a surface with an average roughness of 0.7 - 0.9 ám.

It is possible that at least one of the layers was the base layer of tissue, which further comprises a protective coating to prevent absorption and flowing water through it, printing inks and solvents.

Acceptable to the protective coating contains a fluorocarbon or silicone material.

It is advisable that at least one of the layers of tissue contained numerous fibers or warp and weft threads forming the substrate fabric and the material of the binder, impregnating, essentially, at least one side of the substrate fabric, and the thickness of the partially impregnated substrate fabric was essentially equal to the thickness covered is neither increased compressibility.

Preferably, the fibers or yarns had a tensile strength of at least 150 pounds per inch, fiber or weft threads had a tensile strength of at least 60 pounds per inch, and the substrate fabric had a weight of 4 to 8 ounces per square yard.

Preferably, the compressible layer consisted of a matrix having a multitude of closed cells distributed essentially uniformly in it to give a layer of essentially uniform compression characteristics.

It is useful to have a matrix was flexible thermoplastic or elastomeric material.

It is possible that the canvas is additionally contained a protective coating on a compressible layer of fabric to prevent absorption and flowing water through it, printing inks and solvents.

Acceptable to the protective coating contains a fluorocarbon or silicone material.

It is advisable that the cells were formed from microspheres having a diameter of 1 to 200 μm, which are relatively uniformly dispersed in the binder material in the matrix or matrix material.

Preferably, the microspheres were formed from a material selected from the group consisting of thermoplastic resins, thermosetting e coating to facilitate connection with the binder material, matrix or matrix material.

It is useful to microspheres were represented in the material of the binder in the matrix or matrix material during the filling of the 4 - 90% of the dry weight of these materials.

It is possible that cells were formed from gas bubbles trapped material, a binder, a matrix or matrix material.

It is permissible for the material of the binder or matrix material was thermoplastic resin, thermosetting resin, polyurethane synthetic or natural elastomer.

It is advisable that the elastomer was a nitrile, neoprene or acrylic elastomer.

Preferably, the microspheres were made from phenolic resin and had diameters of 50 to 130 μm.

This task according to further aspect of the present invention is solved by a compressible tissue containing multiple fibers, or the warp and weft threads forming the substrate fabric, and impregnating her matrix material containing many cells in a quantity sufficient to impart fabric of high compressibility, which according to the invention the substrate is partially saturated, and the thickness of the saturated part of the substrate, essentially equal to the thickness of the unpar is her least 30 pounds per square inch, and the matrix material was presented on both sides of the substrate fabric to essentially seal and circle all of the fibers or filaments.

Preferably, the fibers or yarns had a tensile strength of at least 100 pounds per square inch, the fibers or filaments duck had a tensile strength of at least 50 pounds per square inch and the substrate fabric had a weight of 4 to 8 ounces per square yard.

Preferably, the cells were formed from microspheres having a diameter of 1 to 200 μm, which are relatively uniformly dispersed in the binder material in the matrix or matrix material.

It is useful to microspheres were formed from a material selected from the group consisting of thermoplastic resins, thermosetting resins, ceramics, glass and sintered metals.

It is possible that the microspheres contained a surface treatment to facilitate connection with the material of the binder matrix or matrix material.

It is permissible for microspheres were represented in the material of the binder in the matrix or matrix material during the filling of the 4 - 90% of the dry weight of these materials.

It is advisable that the cells were formed from bubbles by gaztelecom binder or matrix material was a thermoplastic resin, thermosetting resin synthetic or natural elastomer.

It is desirable that the elastomer was a nitrile, neoprene or acrylic elastomer.

It is useful to microspheres were made from phenolic resin and had diameters of 50 to 130 μm.

This task according to the fourth aspect of the present invention is solved by a composite articles containing compressible fabric and at least one additional layer or coating to give the product the desired properties, which according to the invention compressible fabric is a compressible fabric according to the previous aspect of the invention.

It is expedient to provide an additional layer was made with the possibility of making the product resistant to the environment, chemical resistance or resistance to wicking.

Preferably, the matrix material was a thermoplastic resin, thermosetting resin, polyurethane or natural or synthetic elastomer.

Preferably, the cells were formed from microspheres having a diameter of 1 to 200 μm, which are relatively uniformly dispersed in the binder material in the matrix or matrix material.

It is possible that the microspheres contained a surface treatment to facilitate connection with the material of the binder matrix or matrix material.

It is permissible for microspheres were represented in the material of the binder in the matrix or matrix material during the filling of the 4 - 90% of the dry weight of these materials.

It is advisable that the cells were formed from gas bubbles trapped material, a binder, a matrix or material particles.

Preferably, the nuts were formed from gas bubbles trapped material, a binder, a matrix or matrix material.

This task according to the fifth aspect of the present invention is solved by a method of manufacturing a compressible tissue, which form the matrix material having a multitude of cells, causing the matrix material to the substrate fabric containing multiple fibers or threads of the warp and weft for environment and soaking essentially all fibers, yarns and magdowski matrix material to impart fabric of high compressibility, and utverjdayut the matrix material to obtain a compressible tissue, which according to izopet is s intervals substrate fabric without forming layer on its outer surface.

It is advisable to additionally applied the matrix material containing cells on the other side of the substrate fabric for, essentially, environment and impregnate all fibers, yarns and intervals without forming layer on the outer surface of the substrate.

Preferably, to further shaped cells with essentially uniform distribution of the microspheres in the matrix material.

It is desirable to additionally formed cells by essentially uniform distribution in forming a matrix material degradable blowing agent and formed from forming a matrix material, the matrix material during decomposition of the blowing agent to form cells.

It is useful to additionally formed cell mechanical introduction in forming a matrix material prior to forming the matrix material, bubbles of gas.

It is possible that as the matrix material used is a thermoplastic resin, thermosetting resin, polyurethane or natural or synthetic elastomer, and additionally kicked the matrix material completely at least on one side of the substrate fabric.

It is permissible for the application of pokr is figuratively, so that the matrix material has calandrelli or smeared on a substrate fabric.

Preferably, the matrix contains an elastomeric material and it was utverjdali heating.

Preferably, the heating is continued long enough, and the temperature of heating was chosen high enough to vulkaniseure elastomeric material.

It is useful to have a matrix material formed from a solution of latex.

It is possible that the matrix material to the substrate fabric was applied by immersion of the substrate fabric in a solution of latex and removing excess solution from the substrate fabric.

Valid to additionally introduced compressible fabric in the composite material, which includes at least one additional layer or coating.

It is advisable to additionally choose the matrix material from the group consisting of thermoplastic resins, thermosetting resins, polyurethane or natural or synthetic elastomer.

Preferably, to further formed composite material in the form of gaskets, packing material or a flexible membrane.

It is desirable to additionally introduced compressible fabric in print what she least one of the additional layers compressible layer.

It is possible that the excess matrix material was removed at least from one side of the substrate fabric to prevent the formation of the layer on the side of the substrate.

Allow the excess matrix material was removed with the squeegee.

This task according to the sixth aspect of the present invention is solved by a method of manufacturing a printing blanket, wherein forming the layer of compressible tissue associated with the compressible layer and the printing face covering, which according to the invention, the compressible layer fabric formed in accordance with the method according to the previous aspect of the invention.

It is advisable to use at least one additional layer of fabric and the layers of tissue disposed between the printed front surface and a compressible layer.

Preferably, in order to improve the stability of the printed surface and its resistance to cutting was formed sublayer placed under the printed front cover.

It is advisable to print the front cover gave the profile of the surface with an average roughness of 0.6 - 0.95 microns, to maintain the other layers have introduced an additional layer of fabric, and support the second canvas.

This task according to the seventh aspect of the present invention is solved by a method of producing a composite material containing at least one substrate fabric, formed of many strands or fibers of the warp and weft in which to improve the physical properties of the material to the substrate fabric is applied to the matrix material, containing many cells for impregnation of the substrate fabric, which according to the invention the matrix material is applied at least on one side of the backing fabric at least partially surrounded by fibers, yarns and magdowski substrate fabric and at least partial impregnation of the fibers, yarns and magdowski matrix material without forming a layer on the outer surface of the substrate, and affect the matrix material to improve at least one of the properties, such as resistance to lateral buckling, the resistance to permanent deformation under compression, elasticity, elastic recovery after deformation, fracture resistance, compressibility, resistance to leaking of fluid or gas and the reduction of thickness.

It is advisable to excess matrix material was removed at least from one side of the substrate fabric for predot the matrix was removed with the squeegee.

Thus, the present invention provides a printing canvas, which has improved elasticity and resistance to decrease in thickness as opposed to offset paintings, known in the prior art. The present invention also provides a printing fabric having improved resistance to swelling and delamination caused by absorption and wicking of printing ink, water and solvents commonly used in printing machines. In addition, these printing blanket may optionally provide fracture resistance and superior breadth of the slice without compromising print quality.

In addition, the present invention provides offset canvas with superior resistance to cutting elastomeric printing face of the coating and subsequent swelling and delamination that may occur as a result of these cuts, and which specified the front surface has a special surface profile, which reduces the increased size of the dot in the printing process while maintaining good release properties.

In addition, the present invention allows to obtain these offset Polo is so the present invention includes forming a laminated unitary structure of the printing blanket, containing in sequence from the bottom up blanket at least the first compressible layer fabric, compressible elastomeric layer having many distributed therein designs of closed cells of at least two additional compressible layer of fabric, an elastomeric underlayer and an elastomeric printing face covering, having a profile adapted to decrease the magnification dot with increasing separation of the printed material from the blanket.

Other details, characteristics, goals, use cases and advantages of the present invention will become apparent from the options, which appear in the following description and in the claims, and from consideration of the attached drawings.

In Fig. 1 shows a greatly enlarged cross section of a layered compressible blanket, made in accordance with the present invention; Fig. 2 is a graph which illustrates and compares the results of tests on the destruction of the obtained offset the canvas prior art (i.e. offset canvas 2 is the ranking of the test results in the destruction, received to offset the canvas prior art (i.e. painting 5060) and two versions blanket of the present invention (i.e. offset paintings 5063 SR and 5063 SRF) of Fig.4 is an enlarged cross-section of the compressible fabric according to the present invention.

As shown in Fig. 1, printing fabric 10 according to the present invention, consists of several layers, glued together into a single unitary structure. For ease of understanding the present invention, each of these layers and their characteristic features will in turn be discussed below.

For the purposes of the present invention, the terms "bottom", "lower" and the like are used to refer to that part of a separate layer or foot layers, which is adjacent to the printing drum, which is placed offset the canvas of the present invention. On the contrary, "top" or "upper" part of one layer or of the foot layer is the part that is furthest away is placed or positioned on the printing drum.

The bottom layer 12 of the blanket 10 includes a new woven substrate that imparts improved resistance to lateral buckling and stiffness due to the transfer Besti elastic recovery after deformation, the failure resistance and compressibility blanket.

Woven substrate layer 12 consists of fibers bases 14 and weft fibers 16, which are formed from natural or synthetic material. These fibers can be twisted or non-twisted obtained from yarn or rovings of desired length. Cotton, polyester, nylon or rayon are typical materials that can be used as fibers or threads of a woven substrate layer 12.

Fiber basics form preferably of natural material such as cotton, while the weft fibers consist of synthetic material, for example, viscose. The fibers or filaments of the warp and weft should have a tensile strength equal to at least 30 pounds per square inch. The substrate preferably has the number of threads per inch in the range of about 55 to 61 (base) and 57 - 63 (ducks). Woven substrate has a weight in the range of about 5.8 to 6.2 oz/square yard and a thickness in the range of 0.014 - to 0.016 inch. In the direction of the base fabric has a tensile strength equal to at least about 150 pounds/inch, while in the weft direction is at least about 60 lbs/inch. In addition, predpochtitelno of 1.9%.

Fabric suitable for use in the present invention (in addition to the tissues described below in the example that highlights the most known way of practical application of the present invention) is not limited fabrics described in U.S. patent 4042743 issued to Larsen and others, the description of which is included in this application by reference. In General, the layer of tissue used in the present invention, the number of fibers or yarns per inch in the direction of the base and in the weft direction may vary from 20 to 150, depending on the denier of the fibers or filaments. In addition, for special cases of application of various layers of fabric of the present invention can be used fabric weight 2 to 8, and preferably 4 to 8 ounces per square yard and a thickness of 0.005 to 0.03 inch.

The bottom layer of fabric 12, and each of the intermediate fabric layers 32 and 34 (discussed below), thoroughly impregnated by immersing the coating material 1 for giving these layers properties to repel printing ink, water and solvent. The coating material is chosen from the point of view of satisfying the requirements of the tests for absence of flowing. Measuring the wicking fabric perform as described above, formation of the material nezatikaika pok the solvent will move up into the tissues within one hour. The solvents tested in accordance with the process described above include water, roelen and tool. In the most preferred case should not be getting these solvents in the fabric. However, it was found that the penetration of toluene in the fabric to approximately 20 mm and Rosolina to approximately 5 mm, does not give acceptable results when using such coated fabrics in printing the canvas of the present invention. As noted above, many manufacturers tissues capable of drawing a satisfactory coatings that meet or even exceed these requirements.

Described in more detail below impregnation coating does not have a significant effect on the coefficient of friction between the inner surface of the blanket 10 and the external outer surface of the printing drum and, thus, does not significantly increase the wear of the blanket 10 due to the rotation of the printing drum. Thus, in the case of the lower layer of fabric 12 does not require the application of special compounds and/or curing.

The coating material is preferably a fluorocarbon or water-soluble in the solvent, and such a low viscosity, that is, is what a sealing coating which effectively eliminates the possibility of wicking, for example, printing inks, water and/or solvents, through internal channels in the tissue. Thus, it is no longer necessary, as practiced in the prior art, sealing the edges of the blanket to prevent leaking from the open edges of the slice. However, in an alternative embodiment, instead of ftoruglerodami material can be used a number of other insulating materials, such as silicone compounds having similar properties of resistance to penetration of water and solvent.

As non-limiting examples, in Japanese patent publication 2116597, from may 1, 1990, the disclosure of which is specifically incorporated in this application by reference, describes a number of fluorocarbon and silicone compounds of the coating. These materials include AG (i.e., "Asahi Guard") 310, 340, 530, 550, 540, 640, 710, 730, 740, 780, 800; S (that is, "Surflon") 111, 112, 113, 121, 131, 132, 141, 145, 381, 382, each of which is a product of Asahi Glass Co. Co., Ltd.; "Unidyne DS- 101, 102, 202, 301, 401, 402, 501, 502 (produced by Daikin co., Ltd. ; "Paraguard" L 80, 30, 61, 0-400, 650, F-5), (produced by Oh-Hara Palladium Chemical Co., Ltd; New-connector" AR 10, SWR, WR40, WR44, WR50, NK Guard), (derivatives Nikka Chemical Indastrial Co., Ltd) and "Solvent" TX product Hoescht Japan, Ltd.

The coating materials selected for use is adowanie blanket 10 by impregnation of a first layer of the coating material, and then drying the coated using known in the art methods. In an alternative embodiment, the coating can be applied after the formation of the blanket 10 using, for example, tools such as roller machine for coating, spray or etc.

As stated above, the "standard" tissue, i.e. tissue, usually used when forming the layers of fabric for offset printing canvases available with a protective coating, as described above, from various manufacturers of textiles, including Wamsutta, a division of Springs Industries, Ink. and Technofabric S. p.A. Consequently, capital expenditures and time required for production can be reduced by the manufacturers blanket when the use of such tissue for the formation of layers of fabric, instead of include, as described above, in the manufacture of the blanket stage coating.

However, the layer of tissue 12 with additionally a coat calandrinia, lowering, or otherwise in contact only with its upper surface with a matrix material 20. The appropriate matrix materials include thermoplastic resins, thermosetting resins, polyurethanes, and natural or synthetic elastomers. Polyvinyl chloride and other polyolefins t is authorized hydrolytic stability are described in U.S. patents 5001208 issued Dengudu and others, and 5013811 issued to Ross and other Content of each of these patents is incorporated in this application by reference. The specialist in this field of technology there are numerous technology application of these materials matrix in liquid form (i.e. with a solution of an organic solvent or latex dispersion) on a woven backing.

Elastomers that are most suitable for use in the present invention are elastomers of the families of Acrylonitrile. neoprene and acrylic. Can also be used polysulfides, either alone or in combination with Acrylonitrile or neoprene. If necessary, can be used by any natural or synthetic elastomer, and such materials are preferred for use in the present invention.

As mentioned above, the elastomer may be applied to the fabric as a latex dispersion or by using media of an organic solvent. Preferred are latex adhesives of these elastomers. Most preferred for forming the elastomer matrix is self-curing nitrile latex elastomer having a total solids from about 30 to about 60%,be a little sour, that is, preferably in the range of approximately 6 - 7. The preferred viscosity of the matrix material is in the range of approximately 14,000 - 20,000 centipoise, and preferably is about 15,000 centipoise.

The matrix material used with layers of fabric further comprises multiple cells in sufficient quantity to impart fabric of high compressibility. In the first embodiment of the invention, the cells may be closed cells formed by the use of a variety of microspheres. Typically, the microspheres are formed from materials such as, for example, thermoplastic resin, thermosetting resin, ceramics, glass and sintered metals. Preferred thermosetting resins for forming the microspheres used in the present invention is a phenol-aldehyde polymer having a density in the range of about 0.01 to 0.05 grams per cubic centimeter. The diameters of the microspheres is approximately 1 to 200, preferably 50 to 130 microns, with the preferred average size is approximately 90 μm. Their relatively uniformly dispersed in the matrix material, so that after application of the matrix by a layer of fabric about what Fermi material, essentially, impregnating and sealing woven substrate on its upper side.

Typically, the microspheres are distributed uniformly on the elastomer so as to avoid any substantial crushing of the microspheres. In addition, the elastomer is introduced into the elastomeric material during the filling of approximately 4 to 90%, and preferably 10 to 70% of the content of solid component. This percentage will vary depending on such parameters as the size of the microspheres, wall thickness and bulk density, and enter if in addition the matrix pore-forming.

For the formation of cells (in the above-described embodiment of the invention) in solution or dispersion of the matrix can be entered in any of a wide variety of microspheres 22. If you use the solutions of solvents selected microspheres must be able to withstand the chemical action of solvents.

There are several types of thermoplastic microspheres, acceptable for use in the present invention, for example, microspheres manufactured by Expancel and Pierce &Stevens. In this embodiment, the preferred are microspheres of thermoplastic resin.

As soon as microspheres dispersion, through the hot cells or the number of hot cells, or passed through the furnace at a temperature sufficient to cause the full expansion of the microspheres in order to jam the matrix in the tissue. During this so-called "passage extensions woven substrates for special cases of application can be applied also additional coverage. However, alternatively, if the impregnation of the fabric of the use of pre-expanded microspheres described above, the step of heating can be excluded.

Optionally, the microspheres may further include covered floor to facilitate their connection with the material of the matrix Pierce & Stevens sells microspheres under the trade name DULITE, which include put on them one of a variety of coatings, for example, talc, calcium carbonate, zinc oxide, titanium dioxide, mica, calcium sulfate, barium sulfate, antimony oxide, clay, silica and hydroxide of aluminum. Select advanced composition sphere/coating further enhances the connection between the fabric and the elastomeric matrix. In U.S. patent 3615972, the description of which is included in this application by reference, describes a number of technologies used in the production of micro is tion of the invention, the cells may be formed in the matrix by mechanical introduction of air into the material, forming a matrix, before it is applied to the fabric, for example, aeration or stirring. Another means of creating cells is the use of chemical pore (the term is also used foaming agents), which are decomposed into gases when they otverzhdajutsja in the connection. One class of such pore is Cellogens produced Uniroyal (Cellogen is a trading name of Uniroyal). Cellogens decompose in the presence of heat, which can be achieved during curing. There are many other types of pore-formers with a wide range of characteristics, decomposition, for example, described in U.S. patent 4548859 issued to Meadows (e.g., column 4, lines 53-66), the disclosure of which is specifically incorporated in this application by reference.

Above the compressible layer fabric is particularly well-suited for applications, such as described herein blanket in the sense that, as is well known, the interval is very important for the printing blanket and, thus, limited sizes available for different layers such blankets, severely limit the choice of patterns available to developers such blankets. In h is taken by a polymer layer, can be transferred to the fabric layers, thus enabling to reduce the size of the associated compressible layer.

Directly above the layer of cloth 12 is placed a compressible layer 24. Layer 24 contains a multitude of closed cells 26 that is embedded in the junction 28. Cell 26 resist larger and more permanent deformation at offset canvas 10, which otherwise would have occurred in the absence of such a layer.

The junction 28 is composed of the corresponding elastic polymer matrix, which for the formation of compounds uniformly dispersed a number ajacobsenmusic materials. Such acecourse materials can be selected from the materials used for the formation of cells in the tissue layer 12, i.e. microspheres (coated or uncoated) and/or pore. As matrix materials are preferred elastomers, and the most preferred matrix material is a mixture of neoprene-nitrile.

As a rule, the connection is applied to the layer of cloth 12 for education in its compressible layer by successive deposition of several layers. For this application acceptable layers with a thickness of approximately 0.002 inches.

Compressible layer 24 can be glued to a layer of inim rubber, but instead, if necessary, can be used many elastomeric adhesives are soluble in water or in organic solvents. The specific choice of adhesive will depend on the particular elastomer used to form layers. Such a connection can alternatively or additionally be performed by using a chemical reaction taking place between the layer of tissue 12 and the connection formed during the subsequent curing process. In addition, the compressible layer 24 can alternatively formed by drawing connections on the separation layer, curing the composition, peeling of the cured compounds from the separation layer and the bonding layer 24 to the layer of tissue 12 during use of the adhesive 30. The connection may also be applied to the layer of cloth 12 by extrusion and calendering. In an alternative embodiment of the invention, optionally, the compressible layer 24 may be deposited on the lower part of the layer of fabric 32 (discussed below), which is located directly above the layer 24, instead of put on the upper part of the layer 12, as described above.

Directly above the compressible layer 24 is laminated intermediate stop fabrics, containing less is oami fabric 32, 34, i.e. the middle and upper tissue layer, respectively, but such an arrangement should not be construed as limiting the present invention, because in this place, if necessary, for special application may include additional layers of tissue (i.e. more than two). Layers 32 and 34 are connected to each other and with the compressible layer 24 using a suitable adhesive 30, for example filled nitrile rubber.

Compressible printing blanket of the prior art, typically received from a compressible layer located under a single layer of fabric or directly under the printed front cover. Additional new characteristic of the present invention that should be noted is that the compressible layer 24 placed at least two fabric layers, i.e. layers 32 and 34, and these layers are discussed in more detail below. This device protects the lower layer 24 from higher voltages, which typically occur on the surface of the printing of such blankets, thus providing a higher degree of resistance of the blanket 10 destruction, as well as increased resistance to leaking giacona substrate layers 32 and 34 consists of fibers bases 36, 38 and weft fibers 40, 42, respectively, formed of natural or synthetic material. Also as in the case of layer 12, these fibers can be twisted or non-twisted from yarn or rovings of desired length. Preferably, the fibers of the framework were derived from natural material such as cotton, while the weft fibers from synthetic material, such as viscose. The threads or fibers of the warp and weft should have a tensile strength equal to at least about 30 pounds per square inch.

In a preferred embodiment, the middle layer 32 has a number of threads per inch in the range of about 75-80 (base) and 53-58 (ducks). Corresponding values for the upper layer 34, respectively, 100-105 (base) and 77-82 (ducks). The fabric used for forming the layer 32 has a weight in the range of about 4.9 to 5.3 ounces/square yard, at the same time as the fabric used to form the upper layer 34 is approximately 3.7 to 3.9 ounces/square yard. The thickness of the layer 32 is in the range of about 0,0105 - 0,0115 inch, while the thickness of the upper layer 34 is approximately 0,008 - 0.010 in, tensile Strength of the middle layer 32 in the direction of the fundamentals of soloa 34 is at least about 70 pounds/inch. The tensile strength of the middle layer 32 in the weft direction is at least approximately 40 pounds/inch, while the corresponding parameter for the upper layer 34 is at least 60 pounds/inch. In the middle layer 32, the fabric should have a residual elongation of not more than approximately 2.2%, while the residual tension of the top layer of fabric 34 may be in the range of about 6 to 10%.

Especially acceptable fabric for forming layers 32 and 34 described in the example below, although the present invention should not be limited to these materials. In addition, instead of the fabric used to form the woven substrate 12 and layers 32 and 34, you can use a variety of other substrate materials, such as sheets of porous plastic, paper or rubber, having a corresponding elongation and tensile strength. Layers 32 and 34 are placed adjacent the front surface, and the layer 32 is also adjacent to the compressible layer 24.

The hallmark of the middle layer 32 from the upper layer 34 is that the middle layer 32 on both sides of the fabric impregnated acetoorcein material, i.e. a set of microspheres preferably evenly distribute Kani, in a manner similar to that with only one side of the impregnated fabric layer 12. If the coating should be applied on both sides of the fabric (for example, the middle layer 32), the preferred method of application is filled microspheres of the matrix material using a bath for coating by immersion and squeeze rollers. It is not necessary that one or both layers of fabric 32 and 34 could be first completely soaked floor 18, for example, fluorocarbon or silicone compound, to give them the property of repelling ink, water and solvent.

Using the coating with a bath for coating by immersing the woven substrate is fed through a bath of the coating by immersion, containing a mixture of the elastomer/microspheres, and then through squeeze rollers to push the liquid into the fabric. Then the fabric is coated with a mixture of elastomer/microspheres, dried or/and vulcanizer in accordance with conventional methods to form a compressible tissue that connect with the tissue layer 34 using a layer of adhesive 30 before multi-stop fabric layers 32, 34 are glued to the compressible layer 24.

To the upper part of the upper layer of fabric 34 is attached to lastninja (i.e. in comparison with the material, used for production of printed front cover, as described below), which preferably is filled with nitrile rubber. However, in an alternative embodiment of the invention for forming a sublayer instead of nitrile rubber can be used many well-known in the art soluble in water and solvents elastomeric compounds. The underlayer 40 envisage to increase the physical properties of the top layer of fabric 34 and consequently to increase the stability of the printed front cover, thereby obtaining as a result of improving the print quality. In addition, the underlayer also serves to improve the resistance of the printed front cover cutting during operation, and thus offset the canvas 10 is less sensitive to subsequent swelling and delamination, which otherwise often occurs when liquids such as printing inks, oils and organic solvents are offset in the fabric 10 through the cuts in the printed front surface.

Elastomeric printing face covering 46, adapted to receive the fingerprint image from the printing plate and transfer it, for example, to the paper substrate, is what I technique the formation of elastomeric printing face of the coating was performed using a well-known way, in which solvated elastomer compound was applied by the squeegee during multiple consecutive passes, forming in a single pass thickness of approximately 0.001 inch over, for example, the substrate or the top layer of fabric.

However, offset the cloth 10 of the present invention differs from the similar products of the prior art that the present invention facial coating formed from an elastomeric compound, is applied without the use of solvents. In addition, the front coating is applied directly on the underlayer in a single pass, for example, by using a method of calendering. This method provides obvious benefits of improved efficiency and reduced the need to control the environment due to the absence of organic solvents.

In addition, as mentioned above, when comparing the material used for forming the underlayer, the elastomeric material used to form the printed front cover has a lower hardness and tensile strength and higher elongation. This means that the underlayer of the present invention preferably has a residual deformation under compression, at least three times the smaller is eating the printed front cover.

In addition, the printing blanket of the type indicated above, typically provided by the profile of the surface roughness in an effort to reduce the increase in point size while maintaining good separation blanket. These profiles roughness in the past received either formation during curing or polishing the cured top coated abrasive medium or coarse sandpaper, which are well known in the art. After that, the surface profile is measured using a device known as a profilometer (manufactured Perthen Corporation), which is also well known in the art. The surface profiles of printed facial coverings layered blankets of the prior art, generally have an average roughness (i.e., "RA") of about 1.0 to 1.8 μm, while the cast blanket that do not have good properties offices typically have an average roughness of 0.3-0.5 µm. In this regard it should be noted that the higher the average roughness, the worse becomes the print quality due to the deterioration of the uniformity of the points.

However, to offset the cloth 10 of the present invention, the average roughness of the printed front cover 42 d is the range of approximately 0.7 to 0.9 μm by polishing with fine emery cloth. The advantage of this treatment is that it provides an offset to the canvas superior properties Department, at the same time providing an improved structure of printed dots, thus providing an offset to the fabric of the present invention improved the quality and separability. This effect of alternative can also be achieved using other well known in the art methods, such as molding.

In Fig. 4 shows a cross-section of the compressible fabric in accordance with the present invention. Fiber 2 and fiber weft 4 woven substrate formed from natural or synthetic fibers, which can be twisted or non-twisted and made of yarn or rovings of desired length. Cotton, polyester, nylon or rayon are typical materials that can be used in the present invention as fibers or filaments.

Fiber basics preferably formed from natural material such as cotton, while the weft fibers from synthetic material, such as viscose. The fibers or filaments of the warp and weft should have a tensile strength equal to at least 30 pounds per square inch. In the preferred embodiment, vypolnen the weft fibers are viscose fibers with high wettability layer 20/1. The substrate preferably has the number of threads per inch in the range of about 55-61 (base) and 57-63 (ducks). Woven substrate has a weight in the range of about 5.8 to 6.2 oz/square yard and a thickness in the range of 0.014-to 0.016 inch. The tensile strength in the direction of the bases is at least about 150 pounds/inch and the weft direction is at least about 60 lbs/inch. In addition, in the preferred embodiment, a woven substrate must have a residual elongation of not more than approximately 1.9 percent.

In addition, acceptable for use in the present invention, but is not limited to them, are the fabric described in U.S. patent 4042743 issued to Larsen and others, which specifically included in this description by reference.

On woven substrate by applying a squeegee, calandrinia, dipping or otherwise apply the coating in contact with the matrix material. Suitable materials for the matrix include thermoplastic resins, thermosetting resins, polyurethane or natural or synthetic elastomers. Polyvinyl chloride and other polyolefins are acceptable thermoplastic resins, although in the U.S. patents 5001208 and 5013811, each of them specially the Nike famous series of surface technology materials matrix in liquid form (i.e. with a solution of a solvent or dispersion of latex) on woven substrate.

The preferred matrix material is an elastomeric compound 6. For the formation of cells in a solution or dispersion of the elastomer can be entered multiple microspheres 8. If you use the solutions of solvents selected microspheres must have resistance to chemical solvents.

There are several acceptable types of thermoplastic microspheres for use in the present invention is produced, for example, Expacel and Pierce &Stevens. For this preferred variant implementation of the invention are preferred microspheres of thermosetting resin. The preferred microspheres are formed from phenol-aldehyde polymer, having a density in the range of about 0.02 to 0.03 grams/cubic centimeter, and preferably approximately 0,023 grams/cubic centimeter.

Pierce & Stevens also sell microspheres under the trade name DUALITE, which can be caused from a variety of coatings. The right choice of song scope/coverage increases the connection between the fabric and the elastomer matrix. In U.S. patent 3615972 issued to Morgause, the description of which is included in this application by reference, describes the invention.

The preferred range of diameters of the microspheres, as a rule, is about 50-130 μm, and the average preferred diameter is a diameter approximately equal to 90 μm. The microspheres generally evenly distributed in the elastomer thus, in order to avoid significant crushing of the microspheres. In addition, microspheres injected into the elastomeric material during the filling of approximately 4-90%, preferably 10-70% content of dry residue. This percentage will vary depending on such parameters as the size of the microspheric getcontainer, wall thickness and bulk density.

Elastomers, preferably suitable for use in the present invention are elastomers families of Acrylonitrile, neoprene rubber, and acrylic. Can also be used polysulfides, alone or in combination with Acrylonitrile, or neoprene. If necessary, can be used by any natural or synthetic elastomer.

As mentioned above, the elastomer may be applied to the fabric in the form of a latex dispersion or by using a carrier solvent. Most preferred for forming the elastomer matrix is self-curing nitrile latex is blithedale 45-50%, and preferably approximately 47%. the pH of this material should be slightly acidic, i.e. preferably in the range of about 6-7. The preferred viscosity of the matrix material is in the range of about 80-90 centipoise, preferably approximately 85 CP.

When applying the above-filled microspheres of the material is, essentially, to impregnate and seal the fibers, filaments and magdowski woven substrate on one side. If should be covered both sides of the fabric, the preferred method of application is filled microspheres of the matrix material is the use of baths for coating by immersion and wringer rolls. Woven substrate is fed through a bath of the coating by immersion, containing a mixture of the elastomer/microspheres, and then passed through squeeze rollers for forcing the liquid into the fabric. Then impregnated with a mixture of elastomer/microspheres fabric is dried and/or vulcanizer in accordance with conventional methods for the formation of compressible fabric.

As shown in Fig. 1 and 4, although the layer of tissue partially or completely saturated filled microspheres matrix material, the coating does not pass caravana the surface of the fabric. Moreover, the impregnated layer of fabric retains its original thickness, i.e. the thickness, measured between its outer longitudinal surfaces, because the matrix containing microspheres, simply fill pre-existing space, i.e. the gaps between the fibers and threads.

The cells may be formed in the matrix material by mechanical introduction of air into the material forming the matrix, before it is applied to the fabric, for example, aeration or stirring. Another means of creating cells is the use of chemical pore (the term is also used foaming agents), which are decomposed into gases when they otverzhdajutsja in the connection. One class of such converters is Cellogens produced Uniroyal (Cellogen is a trading name of Uniroyal). Cellogens decompose in the presence of heat, which can be achieved during curing. There are many other types of pore-formers with a wide range of characteristics of decomposition.

New fabric can be used in many cases of practical applications where a resilient or compressible material. Typically, such material include composite with the quality of packaging materials, gaskets or flexible membranes, which can be used in addition to devices, generally known as seals. Seal fixed connection can be formed by placing a gasket or packing material between the two joined surfaces by application to seal a greater pressure than the pressure that is applied to the connection of the contained liquid or gas. To hold the seal can be applied to many flange, metal-metal, sewn-in, threaded, concentric and special devices.

The compressibility and elasticity of the gasket material gain importance depending on the device type and shape of the strip. Preferred spacers typically are those that are resilient and predictable compressible composition of one or more materials, which can simply be consistent in order to connect the surface with surface imperfections and to compensate for distortion of the surfaces of the connection and flow of work and temperature fluctuations.

Such fabric can be used to create a resilient, compressible composite structures, which are useful when room is ustwo, which not only prevents leakage between the two flanges of a gas or liquid, but is also flexible in any given hole to regulate pressure. The use of this product compressible tissue modifies the surface tension of the deposited film, thus increasing flexibility. This improves the regulation of the pressure at very low pressures.

The effectiveness of the sealing strip, as a rule, increases with increasing softness of the materials, while the ability to seal higher pressures increases with increasing hardness of the materials. The properties such as heat resistance, impermeability, chemical resistance and dimensional stability must be increased to maximum values to achieve effective device strip. In these cases, the application of the loading force on the gasket must be high enough to withstand the hydrostatic pressure of the contents and at the same time maintain sufficient compressive load on the gasket to maintain a tight connection. When this connection has private access to work successfully strip the compressibility becomes important.

The properties of rubber, and materialov and flexible membranes. The elastomer selected for special application, must have certain parameters. As a rule, have found the use of different materials, for example, partiellement rubber, nitrile rubber, silicon-organic rubber, neoprene, natural rubber, and others. To make the elastomeric gasket compressibility can be applied compressible fabric of the present invention. Depending on the requirements of the special properties of this gasket may be composed of multiple layers of similar or different materials. Known also various designs of pads to optimize performance for a particular purpose. This compressible fabric may include one or more elastomeric layers for improved education gaskets, packing material or a flexible membrane. Microspheres attach tissue compressibility, which is an important property for sealing devices. In addition, the elastomeric material of the sealing structure, significantly reduces leaking through the fabric of liquids or gases, which must be held in a vessel or other container with this seal.

A particular application of such strips having the time off and is switched on by the operator when attempting intake gas in the gas tank so the gasket must have sufficient compressibility to withstand numerous opening and closing. If for forming a strip or a flexible membrane for this application the fabric of the present invention is used in combination with a layer of Acrylonitrile or nitrile rubber, have improved properties protivostoyanie. In addition, the improved compressibility allows the product to be more durable compared to a product that does not use compressible fabric.

You can also increase the compressibility of the fabric by using yarn, not fiber. Fiber materials are relatively incompressible, while the yarn has a specified level of compressibility. Thus, it becomes possible to obtain a compressible fabric for use in gaskets, packing materials or flexible membranes, in which the fabric structure contains fibres, not yarn, through the use of compressible fabric of the present invention. In addition, the combination of fabrics from yarns with compressible fabric of the present invention will provide a higher compressibility and greater compensation and recoverability compared with conventional gaskets. This gives advantages in those ugim high compressive loads.

This fabric can be included as one or more tissues, which are used in offset printing canvases. Formed composite material is more perfect compared with offset printing cloths of the prior art. In offset printing canvases special requirements for the period, and the developers found that the physical dimensions of the required printed blankets severely limit the choice of patterns. The present invention has such dimensional constraints to a lesser extent, allowing the developer to transfer part or all of the compressibility and all resistance to lateral buckling blanket fabric instead use one or more of elastomeric compressible layers in addition to one or more layers of a woven substrate.

Even if such dimensional limitations are not a problem, the present invention before the prior art has the advantage that it can be used strictly to increase the performance of the printing blanket. In addition to the resistance to lateral buckling woven poloski blanket, as a rule, do not have a positive impact on A blanket, in which using that fabric. Using compressible fabric in accordance with the present invention achieves improvement of residual deformation due to the compression fabric together with improved elasticity, or the ability of the elastic recovery after deformation fabrics, superior resistance to tissue destruction, compressibility, improved resistance to leaking of fluid or gas and superior resistance thickness loss.

The following non-limiting examples are given solely for the purpose of explanation and do not limit the present invention.

Example 1. In the following examples and conclusions described specific steps and materials found practical use in most known cases of application of the present invention.

Fabric

The bottom layer

The composition thread - Base: layer 20/2. Long staple cotton fiber. Ducks: layer 20/1. Viscose high wetting

Number of threads - Based: 58/inch. Ducks: 56/inch

Weight - 6,00,2 oz/yd2< / BR>
Thickness - 0,0150,001 inches

Tensile strength (pound/inch): 160. Ducks: 60

The residual elongation is 1.9%

Finish - Processing fluorocarbon

The middle layer

the rate of wetting

Number of threads - Base: 76/inch. Ducks: 55/inch

Weight - 5,10,2 oz/yd2< / BR>
Thickness - 0.0110,0005 inch

Tensile strength (pound/inch) - Base: 150. Ducks: 40

Residual tensile - 2,2%

Finish

The top layer

The composition of the thread - Based: 36,5 Odinary. 50/50. A mixture of polyester/cotton. Ducks: 37,5 Odinary. 50/50. A mixture of polyester/cotton

Number of threads - Base: 102/inch. Ducks: 79/inch

Weight - 3,80,1 oz/yd2< / BR>
Thickness - 0,0090,001 inches

Tensile strength (pound-inch) - Base: 70. ducks: 60

Residual tensile - 6 - 10%

Finish

Fabric processing

The materials for cell - Microspheres F -80 SD(produced by Matsumoto Yushi - Jeiyaku Co. Ztd)

Binder - Filled nitrile latex

Compressible layer

The materials for cell - Phenolic microspheres UCAR. BJO -093 (produced by Union Carbide)

Matrix - Filled nitrile rubber

Other compounds

Glue - Filled nitrile rubber

Sublayer - Filled nitrile rubber

The front cover is a Mixture of nitrile/polysulphide.

When forming the printing blanket 10, when using the above materials unexpanded microspheres (i.e. F - 80 SD) was dispersible in NITRILES. One side of each of the lower layer of fabric 12 and the top layer of fabric 34, and both sides of the middle layer of fabric 32 gave two passes latex mixture on the installation application squeegee and was passed through a drying oven installation application squeegee at a rate and temperature sufficient to drain, but not otvetit latex. Then, the resulting coated with layers of fabric again was passed through a drying oven installation application squeegee at a temperature sufficient to simultaneously expand the microspheres and otvetit latex. Tissue layers 32 and 34 connected by glue and then with a layer of fabric 12 glued with compressible layer 24 by means well known in the art methods. Then on the top layer of fabric inflicted connection sublayer and the front cover and the front cover has calandrelli on the surface of the sublayer. Then the finished composite material was utverjdali in the usual way, and the front floor was polished to a surface roughness of approximately 0.7 to 0.9 μm 400 emery cloth. It was found that the thus obtained improved compressible offset printing canvas 10 does not suffer, essentially, all the above drawbacks inherent in the process of printing the previous paintings at UEMOA placing at least two layers of fabric between the compressible layer and the elastomeric printing face coating in the process of printing the canvas of the type described here.

Example 2. In Fig. 2 graphically illustrates the results of comparative tests of the printing blanket type 5056 received in accordance with the present invention, and blanket-type 2000+SR obtained in accordance with the technology of the prior art. That is offset canvas 5056 contains, from top to bottom, print the front cover, the sublayer, two intermediate layers of fabric, compressible layer and the base layer fabric. In contrast, offset canvas 2000+ SR prior art contains only printed face covering, a single intermediate tissue layer, a compressible layer and a base layer formed of two layers of fabric. In both offset paintings, that is, 5056 of the present invention and 2000 + SR prior art compressible layer was formed using well known techniques leaching of salt. Thus, offset canvas 5056 differs from the blanket 2000 + SR in two ways, i.e. compressible layer blanket 5056 protect the two layers of fabric and is offset canvas is additionally provided with a sublayer, as opposed to offset the canvas 2000 + SR, where there is no such sublayer.

Uluchsheniyu with offset blade 2000 + SR, therefore, clearly illustrated on the Fig. 2 in that the change in the density of blanket 5056 considerably smaller with increasing thickness of destruction) than reach for a blanket 2000 + SR prior art. This superior fracture resistance leads eventually to improved characteristics of the print using a blanket 5056 compared with the characteristics of the proposed offset blade 2000 + SR that is surely one of the objects of the present invention.

Example 3. In Fig. 3 graphically shows the results obtained in the second group of comparative tests. Offset canvas 5056 design like offset canvas 2000 + SR, described in example 2 (i.e. compressible layer is located beneath a single layer of fabric), except that the compressible layer is formed using a variety of expanded microspheres. In addition, blanket 5063 SR and 5063 SRF contain such layers, as described above offset canvas 5056, that is, between the compressible layer and the printing face coating has at least two layers of fabric. Although both blanket 5063 SR and 5063 SRF contain compressible layer formed with microspheres, the LEM surface in accordance with the present invention (i.e. has an average roughness RA of more than approximately 0.6 μm, but below about 0.95 μm, while the blanket 5063 SR no such surface profile.

Consideration of Fig. 3 shows that the best results, i.e. the improvement of resistance to destruction, were obtained, first, to offset the canvas 5063 SRF, then offset the canvas 5063 SR, compared with offset blade 5060 prior art, which were obtained worse than at first paintings, characteristics. Thus, it was shown that offset canvas 5063 of the present invention in both of its versions of the SRF and SR provides higher performance (in terms of failure resistance) compared with offset cloths of the prior art.

Example 4. Below is one example of the preferred compressible fabric and method of its formation.

Cloth.

The composition thread: basis: long staple cotton fiber layer 20/2, ducks: viscose H. W. M. layer 20/1.

Number of threads: the basis 583, ducks: 603.

Weight: 60,2 oz/yd2.

Thickness: 0,0150,001 inches.

Tensile strength: base: 150 pounds (minimum) weft: 60 pounds (at least).

Residual tensile: 1,9% (maximum)

Mick is>Average particle size: 90 μm.

Density: is 0.023 g/cm3.

The elastomeric matrix: Hycar h (self-curing nitrile latex elastomer)

Total solids: 47,3, pH 6.5.

Viscosity: 85 CP.

Surface tension: 43 Dyne/see

The method of obtaining tissue contains the following three stages:

1. In nitrile latex injected microspheres and the mixture is stirred until complete dispersion of microspheric getcontainers.

2. Then the mixture of microspheres/latex is applied to the fabric through a bath of the coating by immersion, wringer rolls and doctor blades. Immersion and squeeze rollers are used to ensure maximum saturation of the fabric, and a squeegee is used to remove excess material from the surface.

3. Then the composite fabric is passed through a conventional drying oven or through the drying chamber to facilitate vulcanization. The vulcanization time, usually is 3 to 5 min at 250 - 300oF.

As apparent from the above, embodiments of the present invention can be subjected to various modifications. For this reason, it is important to understand that all of the above are for explanation, not the CLASS="ptx2">

1. Printing canvas, containing having multiple fibers or warp and weft threads forming the substrate, a compressible layer of fabric, elastomeric printing face covering and located between the compressible layer, the binder material which impregnates the substrate fabric and contains many cells in a quantity sufficient to impart fabric of high compressibility, characterized in that the binder material impregnates at least one side of the backing fabric from the partial impregnation, and the thickness of the saturated part of the substrate is essentially equal to the thickness of the covered portion of the substrate.

2. The canvas under item 1, characterized in that it further comprises a sublayer directly under the printed front surface, and the underlayer is formed of elastomeric compounds with high hardness, high tensile strength and low elongation.

3. The canvas under item 1, characterized in that it further comprises at least two layers of fabric between the compressible layer and the elastomeric printing face coating to protect the compressible layer from at least part of the stress occurring on the printed front surface.

4. The canvas under item 1 that distinguishes the="ptx2">

5. The cloth on p. 4, characterized in that the elastomeric face covering has a surface profile with an average roughness of 0.7 - 0.9 ám.

6. The cloth on p. 3, characterized in that at least one of the layers is a base layer of fabric, which further comprises a protective coating to prevent absorption and flowing water through it, printing inks and solvents.

7. The cloth on p. 3, characterized in that at least one of the layers of fabric contains many fibers or warp and weft threads forming the substrate fabric and the material of the binder, impregnating, essentially, at least one side of the substrate fabric, and the thickness of the partially impregnated substrate fabric is essentially equal to the thickness of the untreated substrate fabric, the binder material contains many cells in a quantity sufficient to impart fabric of high compressibility.

8. The canvas under item 1, characterized in that the fibers or yarns have a tensile strength of at least 150 pounds per inch, fiber or weft yarns have a tensile strength of at least 60 pounds per inch, and the substrate fabric has a weight of 4 to 8 ounces per square yard.

9. The fabric according to any one of paragraphs.1, 3 and 7, otlichit, evenly in it to give a layer of essentially uniform compression characteristics.

10. The painting by p. 9, characterized in that the matrix is a thermoplastic or elastomeric material.

11. The fabric according to any one of paragraphs.1 and 7, characterized in that it further comprises a protective coating on a compressible layer of fabric to prevent absorption and flowing water through it, printing inks and solvents.

12. The cloth on p. 11, characterized in that the protective coating contains a fluorocarbon or silicone material.

13. The fabric according to any one of paragraphs.1 and 7, characterized in that the cells formed from microspheres having a diameter of 1 to 200 μm, which are relatively uniformly dispersed in the binder material in the matrix or matrix material.

14. The painting by p. 13, characterized in that the microspheres are formed from a material selected from the group consisting of thermoplastic resins, thermosetting resins, ceramics, glass and sintered metals.

15. The painting by p. 13, characterized in that the microspheres contain a surface coating to facilitate connection with the material of the binder matrix or matrix material.

16. The painting by p. 13, characterized those who tonnes dry weight of these materials.

17. The fabric according to any one of paragraphs.1 and 7, characterized in that the cells are formed from gas bubbles trapped material, a binder, a matrix or matrix material.

18. The fabric according to any one of paragraphs.1 and 7, characterized in that the material of the binder or matrix material is a thermoplastic resin, thermosetting resin, polyurethane synthetic or natural elastomer.

19. The painting by p. 18, characterized in that the elastomer is a nitrile, neoprene or acrylic elastomer.

20. The painting by p. 13, characterized in that the microspheres are made of phenolic resin and have diameters of 50 to 130 μm.

21. Printing fabric containing elastomeric printing face covering, characterized in that the elastomeric printing face covering has a surface profile with an average roughness of 0.6 - 0.95 microns to increase otdelimosti when the dot size when printing.

22. The painting by p. 21, characterized in that it further comprises at least one fabric layer and the compressible layer printed below the front cover.

23. The painting by p. 22, characterized in that it further comprises a sublayer directly under the printed face pokrytiya tensile and low aspect ratio.

24. The fabric according to any one of paragraphs.21 and 22, characterized in that it further comprises at least two layers of fabric between the compressible layer and the elastomeric printing face coating to protect the compressible layer from at least part of the stress occurring on the printed front surface.

25. The painting by p. 21, characterized in that the elastomeric face covering has a surface profile with an average roughness of 0.7 - 0.9 ám.

26. The painting by p. 24, characterized in that at least one of the layers is a base layer of fabric, which further comprises a protective coating to prevent absorption and flowing water through it, printing inks and solvents.

27. The painting by p. 26, characterized in that the protective coating contains a fluorocarbon or silicone material.

28. The painting by p. 24, characterized in that at least one of the layers of fabric contains many fibers or warp and weft threads forming the substrate fabric and the material of the binder, impregnating, essentially, at least one side of the substrate fabric, and the thickness of the partially impregnated backing fabric, essentially equal to the thickness of the untreated substrate fabric, the binder material soda. oloto on p. 28, characterized in that the fibers or yarns have a tensile strength of at least 150 pounds per inch, fiber or weft yarns have a tensile strength of at least 60 pounds per inch, and the substrate fabric has a weight of 4 to 8 ounces per square yard.

30. The fabric according to any one of paragraphs.24 and 28, wherein the compressible layer comprises a matrix having a multitude of closed cells distributed essentially uniformly in it to give a layer of essentially uniform compression characteristics.

31. The painting by p. 30, characterized in that the matrix is a flexible thermoplastic or elastomeric material.

32. The painting by p. 28, characterized in that it further comprises a protective coating on a compressible layer of fabric to prevent absorption and flowing water through it, printing inks and solvents.

33. The painting by p. 32, characterized in that the protective coating contains a fluorocarbon or silicone material.

34. The painting by p. 28, wherein the cells are formed from microspheres having a diameter of 1 to 200 μm, which are relatively uniformly dispersed in the binder material in the matrix or matrix material.

35. The painting by p. YH resins, thermosetting resins, ceramics, glass and sintered metals.

36. The painting by p. 34, characterized in that the microspheres contain a surface coating to facilitate connection with the material of the binder matrix or matrix material.

37. The painting by p. 34, characterized in that the microspheres are presented in the material of the binder in the matrix or matrix material during the filling of the 4 - 90% of the dry weight of these materials.

38. The painting by p. 28, wherein the cells are formed from gas bubbles trapped material, a binder, a matrix or matrix material.

39. The painting by p. 28, characterized in that the material of the binder or matrix material is a thermoplastic resin, thermosetting resin, polyurethane synthetic or natural elastomer.

40. The painting by p. 39, characterized in that the elastomer is a nitrile, neoprene or acrylic elastomer.

41. The painting by p. 34, characterized in that the microspheres are made of phenolic resin and have diameters of 50 to 130 μm.

42. Compressible fabric containing multiple fibers, or the warp and weft threads forming the substrate fabric, and impregnating her matrix material containing many aceon partially, moreover, the thickness of the saturated part of the substrate, essentially equal to the thickness of the covered portion of the substrate.

43. The fabric on p. 42, characterized in that the fibers or filaments have a tensile strength of at least 30 pounds per square inch, and the matrix material presented on both sides of the substrate fabric to essentially seal and circle all of the fibers or filaments.

44. The fabric on p. 42, characterized in that the fibers or yarns have a tensile strength of at least 100 pounds per square inch, the fibers or weft yarns have a tensile strength of at least 50 pounds per square inch, and the substrate fabric has a weight of 4 to 8 ounces per square yard.

45. The fabric on p. 42, wherein the cells are formed from microspheres having a diameter of 1 to 200 μm, which are relatively uniformly dispersed in the binder material in the matrix or matrix material.

46. The fabric on p. 45, characterized in that the microspheres are formed from a material selected from the group consisting of thermoplastic resins, thermosetting resins, ceramics, glass and sintered metals.

47. The fabric on p. 45, characterized in that the microspheres contain a surface coating to facilitate connection crosfire presented in the binder material, in the matrix, or the matrix material during the filling of the 4 - 90% of the dry weight of these materials.

49. The fabric on p. 42, wherein the cells are formed from gas bubbles trapped material, a binder, a matrix or matrix material.

50. The fabric on p. 42, characterized in that the material of the binder or matrix material is a thermoplastic resin, thermosetting resin, polyurethane synthetic or natural elastomer.

51. The fabric on p. 50, characterized in that the elastomer is a nitrile, neoprene or acrylic elastomer.

52. The fabric on p. 45, characterized in that the microspheres are made of phenolic resin and have diameters of 50 to 130 μm.

53. Composite article containing a compressible fabric and at least one additional layer or coating to give the product the desired properties, characterized in that the compressible fabric is a compressible fabric by p. 42.

54. The article on p. 53, characterized in that the additional layer is made with the possibility of making the product resistant to the environment, chemical resistance or resistance to wicking.

55. The article on p. 53, characterized in that the matrix material is the CLASS="ptx2">

56. The article on p. 53, wherein the cells are formed from microspheres having a diameter of 1 to 200 μm, which are relatively uniformly dispersed in the binder material in the matrix or matrix material.

57. Article by p. 56, characterized in that the microspheres are formed from a material selected from the group consisting of thermoplastic resins, thermosetting resins, ceramics, glass and sintered metals.

58. Article by p. 56, wherein the microspheres contain a surface coating to facilitate connection with the material of the binder matrix or matrix material.

59. Article by p. 56, characterized in that the microspheres are presented in the material of the binder in the matrix or matrix material during the filling of the 4 - 90% of the dry weight of these materials.

60. The article on p. 53, wherein the cells are formed from gas bubbles trapped material, a binder, a matrix or matrix material.

61. Article by p. 56, characterized in that the microspheres are made of phenolic resin and have diameters of 50 to 130 μm.

62. A method of manufacturing a compressible tissue, which form the matrix material having a multitude of cells, causing the matrix material on which all of the fibers, yarns and magdowski matrix material to impart fabric of high compressibility, and utverjdayut the matrix material to obtain a compressible fabric, characterized in that the matrix material is applied at least on one side of the substrate fabric with a filling material of a matrix of intervals of the substrate fabric without forming layer on its outer surface.

63. The method according to p. 62, characterized in that it further cause the matrix material containing cells on the other side of the substrate fabric for, essentially, environment and impregnate all fibers, yarns and intervals without forming layer on the outer surface of the substrate.

64. The method according to p. 62, characterized in that it further to form cells with essentially uniform distribution of the microspheres in the matrix material.

65. The method according to p. 62, characterized in that it further form cells by essentially uniform distribution in forming a matrix material degradable blowing agent and form of forming a matrix material, the matrix material during decomposition of the blowing agent to form cells.

66. The method according to p. 62, characterized in that it further forming the cells mechanically the Method according to p. 62, characterized in that the matrix material using a thermoplastic resin, thermosetting resin, polyurethane or natural or synthetic elastomer, and optionally cause the matrix material completely at least on one side of the substrate fabric.

68. The method according to p. 67, characterized in that the coating implement sequential deposition of multiple layers of a matrix on a substrate fabric.

69. The method according to p. 62, characterized in that the matrix material will calandro or smear on the substrate fabric.

70. The method according to p. 62, characterized in that the matrix contains an elastomeric material, and its utverjdayut heating.

71. The method according to p. 70, characterized in that the heating is continued long enough, and the temperature of heating is chosen high enough to vulkaniseure elastomeric material.

72. The method according to p. 62, characterized in that the matrix material is formed from a solution of latex.

73. The method according to p. 72, characterized in that the matrix material to the substrate fabric is applied by immersion of the substrate fabric in a solution of latex and removing excess solution from the substrate fabric.

74. The method according to p. 73, characterized in that additionally the layer or coating.

75. The method according to p. 74, characterized in that it additionally choose the matrix material from the group consisting of thermoplastic resins, thermosetting resins, polyurethane or natural or synthetic elastomer.

76. The method according to p. 73, characterized in that it further form the composite material in the form of gaskets, packing material or a flexible membrane.

77. The method according to p. 70, characterized in that it further introduce compressible fabric printing fabric, which includes many additional layers.

78. The method according to p. 77, characterized in that at least one of the additional layers is compressible layer.

79. The method according to p. 62, characterized in that the excess matrix material is removed at least from one side of the substrate fabric to prevent the formation of the layer on the side of the substrate.

80. The method according to p. 79, characterized in that the excess matrix material is removed using a squeegee.

81. A method of manufacturing a printing blanket, wherein forming the layer of compressible tissue associated with the compressible layer and the printing face covering, characterized in that the layer of compressible tissue form in southeasterly tissue layer, moreover, layers of tissue have between the printed front surface and a compressible layer.

83. The method according to p. 82, characterized in that for improving the stability of the printed surface and its resistance to cutting to form the sublayer placed under the printed front cover.

84. The method according to p. 83, characterized in that the printed face of the cover give the profile of the surface with an average roughness of 0.6 - 0.95 microns, to maintain the other layers introduce an additional layer of tissue and supporting tissue layer includes a protective coating to prevent absorption or wicking of liquids to offset the canvas.

85. A method of obtaining a composite material containing at least one substrate fabric, formed of many strands or fibers of the warp and weft in which to improve the physical properties of the material to the substrate fabric is applied to the matrix material, containing many cells for impregnation of the substrate fabric, characterized in that the matrix material is applied at least on one side of the substrate fabric with at least partial encirclement of fibers, yarns and magdowski substrate fabric and with at least partial impregnation of fibers, yarns and magdowski material mA is improving at least one of these properties, as resistance to lateral buckling, the resistance to permanent deformation under compression, elasticity, elastic recovery after deformation, fracture resistance, compressibility, resistance to leaking of fluid or gas, and the reduction of thickness.

86. The method according to p. 85, characterized in that the excess matrix material is removed at least from one side of the substrate fabric to prevent the formation of the layer on the side of the substrate.

87. The method according to p. 86, characterized in that the excess matrix material is removed using a squeegee.

Priority points:

15.11.91 on PP. 1, 8 - 10, 13, 14, 16 - 20, 42 - 46, 48 - 53, 55 - 77, 79, 80 and 85 - 87;

14.02.92 on PP.2 - 7, 11, 12, 15, 21 - 41, 47, 54, 78 and 81 - 84.

 

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46 cl, 8 dwg

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