Thermosetting print blanket

FIELD: printing industry.

SUBSTANCE: frame of print blanket includes substrate, compressible layer and upper textile bundle. Substrate of textile bundle comprises at least one textile layer. Each layer has multiple fibres or threads of warp and woof. Compressible layer includes moisture-hardened thermosetting polymer in the form of polyurethane, urea resin or their mixture. Compressible layer contains multiple evenly distributed closed cells and has uniform characteristics of compression. Compressible layer is applied over substrate. Upper textile bundle comprises at least one textile layer. Each layer has multiple fibres or threads of warp and woof. Textile bundle is applied over compressible layer. Method has also been proposed for manufacturing of compressible frame of print blanket.

EFFECT: invention makes it possible to reduce time for preparation and hardening of print blanket.

13 cl, 1 dwg, 8 tbl, 4 ex

 

The technical field to which the invention relates

The invention relates to a method of manufacturing a multilayer blanket, such as offset lithographic surface, in which the frame of the canvas is made mainly of thermosetting material. Elastomeric print surface is applied or laminated on the frame containing thermosetting material. Microspheres can be included in thermosetting frame to provide compressibility of the canvas.

Background of invention

The use of blankets in the methods of printing, such as offset lithographic printing, is known, and such blanket have the basic function of transferring printing ink from the printing plate to the paper. Such printing blanket is very carefully designed so that the blade is not damaged or mechanical contact with the printing apparatus, or a chemical reaction with the ingredients of printing ink or other solvents used in the printing process. Repeated mechanical contacts really cause a compression of the blanket, but the integrity of the blanket should be maintained within acceptable limits so that the image is properly reproduced. It is also important to offset the canvas had characterized the Tiki elastic recovery after deformation so it to be able to the final return to its original thickness, and to ensure the image transfer constant.

Multilayer polymer blanket can be broadly described as having two subcomponents layer: the print surface and the frame. The layer of the printing surface is part of the fabric, which transfers the printing ink from the plate to the paper, etc. Frame is one-piece construction, the layer below the surface. To create a skeleton that can withstand the efforts of the printing process requires a number of polymeric coatings and tissue layers. The frame generally requires at least two woven material, each of which has on it a composite coating of polymeric material to be pressing for the formation of a unified whole. The polymeric material may include microspheres, in order to make the design compressible. The outer coating or outer material, which is the printing material is applied to the top layer of fabric. This whole process could be 15 or 20 coatings when passing through the machine for the production of polymer layered materials plus 3 or 4 layers of fabric.

The key to receiving blanket having the desired compressibility, tension, and elasticity, is to provide therein a compressible layer. In particular, about izvestno, that include at least one compressible layer elastic polymer comprising a reinforcing fabric, offset canvas, problems printing, such as described above, as well as "erosion" (i.e. lack of clarity)due to the small standing wave in a plate printing surface adjacent to the pressure roller of the printing press, can be avoided. This compressible layer may also serve to absorb the "excess pressure", that is, a significant deformation of the web, due to a temporary increase in the thickness of the material subject to printing, for example, the accidental introduction of more than one sheet of paper during printing. The inclusion of the compressible layer in offset canvas "excessive pressure" can be removed without permanent damage to the blanket or deterioration of the printing quality of the canvas. In addition, elastic, compressible layer helps to maintain the evenness of the printing surface and the thickness of the blanket during printing, restoring the normal thickness of a cloth after compression in the gap of the printing apparatus.

However, the blanket of the type indicated above have various disadvantages that adversely affect their durability and print quality. For example, they are prone to capillary wicking of ink, water and solvents commonly used in printing the EXE, either via open cut sheet edges, or in cases where these edges are protected by the application of a sealant, right through the cracks in the canvas or the lower layer of fabric. Water, solvents and printing inks that are cramping beneath layers of cloth, can react with or cause deterioration of glues that bind the various layers of the covering together. In the best case, this can cause bubbling blanket, resulting in degraded print quality and reduced speed printing due to the instability created in the canvas. In the worst case, the capillary leaking can cause delamination of the fabric, which can cause significant damage to the printing apparatus, and a large downtime.

It would therefore be very desirable to create offset canvas, which does not require so much of polymeric layers and nalavany, and while retains the desirable characteristics voltage multilayer coating. It would also be desirable if the canvas resisted the action of the solvent and other chemicals to resist delamination of the coating. Also environmentally desirable to remove many of volatile solvents. Further it would be desirable to make these blanket at a lower cost than the cost required in the case of multilayer blankets, currently known in the smoother technique.

Description of the prior art

In U.S. patent No. 6645603 (Serain et al.) described offset of the canvas, which includes at least one layer of thermoplastic elastomer. This layer may be made of polyurethane.

In U.S. patent No. 6071620 (Kuczynski et al.) exposed lithographic layer to blanket. Lithographic layer (that is, the print surface is a layer of thermoplastic material, which ensures maximum transfer of printing ink from the printing cylinder to the paper. thermoplastic is preferably polyurethane or ethylene-propylene, which has been polarized by the inclusion of additional ingredients, such as ethylene vinyl acetate, mineral filler, a plasticizer and a pigment.

In U.S. patent No. 6027789 (Canet et al.) disclosed to the print surface for a blanket. Disclosed substrate under the print surface, which may be made of a hydrophobic or hydrophilic elastomeric material, such as polyolefin or polyurethane.

In U.S. patent No. 5974974 (Agnew et al.) disclosed offset canvas, in which the printing layers are formed from elastomeric polymers formed by photopolymerization. The polymer may be a polyurethane.

In U.S. patent No. 554968 (Byers et al.) revealed offset canvas, in which the traditional compressible layer may be removed in the connection impregnated compressible fabric. The impregnated fabric may consist of thermosetting polymers having microspheres.

In U.S. patent No. 5487339 (Breventani et al.) disclosed a method of attaching a retaining strap to offset the canvas, which apply a strip of thermoplastic or thermosetting hot melt material, such as polyurethane or nylon to attach the securing bar to offset the canvas.

In U.S. patent No. 5389171 (Bartholmei et al.) disclosed a method of creating a blanket, where the outer layer of the coating (i.e. the printing layer) is preferably made of a flexible, cured polymer, such as polyurethane.

In U.S. patent No. 5352507 (Bresson et al.) disclosed seamless multilayer offset canvas, in which the elastically compressible layer includes a foamed elastomeric material such as polyurethane, which may be reinforced with fibers.

In U.S. patent No. 4303721 (Rodriguez et al.) disclosed printing canvas foam with closed cells, in which the compressible layer may include polyurethane.

In U.S. patent No. 4174244 (Thomaset al.) disclosed a method of creating a blanket, in which the cover or top printing layer may include any material having rubber or compressible properties, which will be dried and, if necessary, to foam in the conditions of molding. Examples of preelementary include polyurethane.

In U.S. patent No. 3983287 (Goosen et al.) revealed offset canvas, in which the elastic layer contains polyurethane.

Additional objectives and advantages of the invention will be set forth in part in the description that follows, and will partly be obvious from the description or may be learned with the practice of the invention. Objectives and advantages of the present invention may be realized and attained by the means and combinations particularly underlined in the attached claims.

The invention

In General, the elastomers are any elastic materials having properties similar to rubber. They can be extremely stretched and usually return to their pre-stretched shape without deformation. This flexibility is due to the glass transition temperatures of elastomers (TC)near or below room temperature. In addition, the molecules of the elastomer usually are not focused, but easily line up in the oriented state under tension.

Unlike elastomers, thermoplastic normally solid, having a TC above room temperature but will melt or soften when heated and again dried at cooling. And thermoplastics and elastomers can be cast and molded when heated above their respective TC. Methods of processing thermoplastic products, thus, include the agrevanie and the application of pressure to the material, in order to achieve his Vehicle. The material can then be extruded or molded into desired forms.

Thermosetting material is completely different from elastomer or thermoplastic plastic. Thermosetting polymers are stitched together to such an extent that they "harden" in this form, when first made, and cannot be molded or cast later, when heated to their Vehicle. Rather thermosetting material will disintegrate after heating above its TC. They are usually solid, strong and fragile, but they can be a little soften when heated below their TC. Because of this extensive crosslinking thermosetting material is very resistant to interactions with other chemicals, as well as to high temperatures and wear. Therefore, it is often used as a coating or adhesive, to prevent corrosion of basic materials. Phenol, melamine and resorcine-formaldehyde resin, furano-, poliafito, polyimide - and urea-formaldehyde resin is a thermosetting adhesives that offer strong links and good resistance to high temperatures.

Offset the canvas according to the present invention uses a thermosetting material in the frame of the printing blanket, and can be produced in different ways. Thermosetting material can be used in any or all layers, depending on gellately what's properties. thermosetting material may include a single large compressible layer of microspheres. Additionally, thermosetting material can be used as the adhesive between the fabric layers. In one specific embodiment, thermosetting material containing microspheres to form a compressible layer, applied on the reinforced fabric base. The top fabric is then applied to the compressible layer for additional strengthening, which in the end should the outer layer.

In one specific embodiment, offset fabric includes a fabric layer two-layer basis, compressible thermosetting polyurethane or polyurea layer on top of the fabric layer double-layer base and top fabric.

Brief description of drawing

The drawing is a greatly enlarged view in section of a multilayer blanket according to the invention.

Detailed description

A fabric substrate 12 consists of at least one fabric layer having fibers 14 fundamentals and weft fibers 16, which is formed from natural or synthetic material. These fibers are woven and are made from yarn or filament yarn of the desired length. Cotton, polyester, nylon, rayon, etc. are typical materials that can be used as fibers or threads tkane the second substrate 12.

Preferably the fibers 14 bases formed from natural material such as cotton, while the weft fibers 16 include synthetic fabric (e.g., polyester). The fibers or filaments of the warp and weft should have a tensile strength of at least 30 pounds per inch. The substrate preferably has the number of threads per inch, constituting between approximately 55-61 (base) and 57-63 (ducks). The fabric substrate is between about 5.8 and about 6.2 ounces per square yard in weight and from 0,014 up to 0.016 inches in thickness (also called "calibre"). The direction of the bases has a tensile strength of at least about 150 pounds per inch, whereas the tensile strength weft direction is at least about 60 pounds per inch. In addition, in the preferred embodiment, the fabric substrate must be able to a residual elongation of not more than approximately 1.9 percent.

In General, tissue layers used in the present invention, the number of fibers or filaments per inch for both directions basics and duck, can vary between 20 and 150, depending on the denier of the fibers or filaments. In addition, you can use fabric weight of 2-8, preferably about 4-8 ounces per square yard and a thickness of 0.005 and 0.03 for specific applications of the various tissue layers of the present invention.

Tissue mean the ku 12 is additionally coated by spraying, calendering, by immersing or otherwise contacting with the upper surface of the adhesive material 20. Appropriate adhesives include thermoplastic resins, thermosetting resins, polyurethanes, and natural or synthetic elastomers. Polyvinyl chloride (PVC) and other polyolefins are suitable thermoplastic resins, while polyurethane is preferred.

Appropriate adhesives include adhesives of Acrylonitrile, neoprene and acrylic family. Polysulfides, alone or in combination with Acrylonitrile or neoprene may also be used. Any natural or synthetic elastomer can be used, if desirable, and such materials are preferred for use with the invention.

Preferably, the adhesive may be a thermosetting resin, most preferably a thermosetting polyurethane or polyurea. The preferred viscosity of the matrix material is between about 10000 and 25000 centipoise (cps).

Polyurethanes, moisture-curable, is obtained from resins having terminal isocyanate NCO group in the molecule. They are usually odnoupakovochnye the polyurethane prepolymer. After applying the prepolymer or isocyanate group reacts with moisture in the atmosphere to obtain the final stitched cover.

They are usually nizkomolekularnah the mi linear polymers with terminal isocyanate groups. Such prepolymers, completed isocyanate groups can be obtained by the reaction of an excess of MDI high gidroksilirovanii complex polyester or polyether polyols.

End isocyanatopropyl react with any compound containing an active hydrogen such as alcohols, amines, or other polyurethane and urea. For curing in a moist environment, the active hydrogen is provided by atmospheric moisture. Thus, the relative humidity will affect the speed with which cures system.

The reaction is a two-step process, where the water first reacts with the isocyanate groups with the formation of amine and carbon dioxide. Amin then will react with other isocyanate groups to form urea until the consumption of all available isocyanates. Produced carbon dioxide diffuses through the film and then evaporates from the system. The reaction can be summed up in the result as follows:

- NCO + H2O → -NH2+ CO2

- NCO +NH2→ -NH-CO-NH

- NCO +-NH-CO-NH- → -NH-CO-NH-CO-N

The adhesive used with the tissue layers can optionally contain many cells. These cells, closed or open, similar to the formation of the compressible layer, described below.

Layer located directly above the adhesive 20 and associated, is the cloth 30, the switch is in the fact that at least one fabric layer. Fabric yarn fabric 30 is similar in many respects fabric substrate 12, discussed above, that the layers of fabric 30 are composed of fibers bases 32 and weft fibers 34, respectively, formed of natural or synthetic material. These fibers, as in the case of the substrate 12 are woven and composed of a yarn or filament yarn of the desired length. Preferably the fibers form a basis of natural material such as cotton, while the weft fibers comprise synthetic fibers (e.g. polyester). As yarn and fiber warp and weft should have a tensile strength{strength} of at least about 30 pounds per inch.

In a preferred embodiment, the filaments of fabric 30 has a number, threads per inch, constituting between approximately 75-80 (base) and 53-58 (ducks). The fabric 30 is changed, by weight, between about 4.9 and 5.3 oz per square yard. The thickness, i.e. the caliber of the fabric 30 varies between approximately 0,0105 and 0,0115 inches. Fiber basics 32 have a tensile strength{strength} of at least about 150 pounds per inch. The tensile strength weft fibers 32 is at least about 40 pounds per inch. Fabric 30 must be capable of a residual elongation of not more than approximately 2.2%.

Above fabric 30 is compressible layer 40. Gripping the edge of your is the range of the layer 40 made of the corresponding elastic matrix 42 thermosetting polymer, in which the materials forming cells or microspheres 44, uniformly dispersed with the formation of the composition. The polymer matrix may be a material similar to that used in the adhesive layer 20, including Acrylonitrile, neoprene and acrylic materials. Polysulfides, alone or in combination with Acrylonitrile or neoprene may also be used. Preferably the polymer matrix is a thermosetting resin, most preferably a thermosetting polyurethane or polyurea. The preferred viscosity of the matrix material is between approximately 50000 - 60000 cps.

Typically, the microspheres are formed from materials such as thermoplastic resins, thermosetting resins and phenolic resins. The microspheres have a diameter of approximately 1-200, preferably 50-130, micron, with an average size of about 90 microns is most preferred. They are scattered relatively evenly distributed within the matrix material so that when applying the matrix on the tissue layer, they become fully embedded in its intervals. Thus, when applying the material loaded microspheres described herein mainly impregnates the fabric substrate on its front side.

The microspheres are uniformly distributed within the elastomer in such a way as to avoid any appreciable tablenamemore. Additionally, the microspheres are included in the elastomeric material when loading approximately 1-20% by weight and preferably 1-10% of the solid content material. This percentage will vary based on such factors as the size of the microspheres, wall thickness, degree of any stitching and bulk density or if porophore additionally included in the matrix.

To form the cells in the embodiment described above, any of a wide variety of microspheres 44 may be added to the solution or dispersion of the matrix 42. If using solutions selected microspheres should be resistant to chemical solvents.

Sold several acceptable types of thermoplastic microspheres for use with the present invention, for example Expancel and Dualite. Microspheres of thermoplastic resins preferred for this variant of the structure.

Optionally, the microspheres may further include a coating to prevent agglomeration. Can be any coating, such as talc, calcium carbonate, zinc oxide, titanium dioxide, mica, calcium sulfate, barium sulfate, antimony oxide, clay, silica and aluminum trihydrate. The wrong choice of field/coating can interfere with the desirable properties of the matrix, which can adversely affect the polymerization.

Preferably ureterolithotomy layer 40 according to the present invention this melt moisture curable system, such glue 20, and does not use a carrier solvent. Therefore, it can be done without repeating passages coating layers inherent in the prior technology. Compressible layer 40 may be applied as a single layer, which can be applied in a quantity in excess of 0.04 inch in a single pass. In offset paintings typical of the prior art, the compressible layer is formed, applying several thin layers of fabric sequential application to create the desired thickness. This is necessary for effective volatilization of the solvent from the coated elastomer, without the formation of voids in the compressible layer. Thus, the cooking time and curing paintings were significantly reduced.

Compressible layer 40 may be affixed to the fabric 30, for example, applying a layer of an appropriate adhesive (not shown). Certain adhesive will depend on the particular elastomer used to form the layers. Preferably the compressible layer 40 is connected directly with the fabric 30, without the use of additional adhesives.

Above the compressible layer 40 is a top fabric 50, which includes at least one fabric layer. Fabric 50 can then be associated with a compressible layer 40 using an appropriate adhesive, such as described above. Preferably the fabric is 50 is pushed directly into the compressible layer 40, reducing the need for glue.

Fabric upper layers of the fabric 50 is similar in many respects fabric substrate 12, discussed above, in which tissue layers 50 are composed of fibers bases 52 and weft fibers 54, respectively, formed of natural or synthetic material. These fibers, as in the case of the substrate 12 are woven and composed of a yarn or filament yarn of the desired length. How fiber basics and weft fibers or yarns must have a tensile strength of at least about 30 pounds per inch.

In a preferred embodiment, tissue layers 50 have the number of threads per inch, constituting between approximately 100-105 (base) and 77-82 (ducks). The fabric used to form layer 50 varies in weight between approximately 3.7 and 3.9 ounces per square yard. The thickness, i.e. the caliber of the upper layer 50 varies between approximately be 0.008 and 0.010 inches. In the direction of the fundamentals of the upper layer 50 has a tensile strength of at least about 70 pounds per inch. The tensile strength in the weft direction of the layer 50 is at least about 60 pounds per inch. In the upper fabric layer 34, the stretch fabric may be between approximately 6 and 10%.

From the upper part of the fabric 50 is connected elastomeric subpoverty 60 formed from high strength, highly with the resistance to rupture and low elongation (i.e. in comparison with the material, used to generate the print surface, as described below), which is preferably mixed with nitrile rubber. As an option, however, may use a variety of elastomeric compounds on the basis of water and solvents known in the prior art, instead of nitrile rubber in the formation of subpoverty. Subpoverty 60 introduced to strengthen the print surface, thereby obtaining a longer lifespan blanket and resistance to etching using.

Elastomeric print surface 70 adapted to receive a printed image from the printing plate and transfer it, for example, to the paper substrate, is the upper layer of the laminated/coated offset the canvas 10. In the paintings of the prior art the application of elastomeric printing surface was usually performed by the known method of drawing a knife on Rosatom platen, in which solvated elastomer composition is applied during many consecutive passes, putting a thickness of about 0,001" with each pass over, for example, subpoverty or upper fabric layer. In addition, as highlighted above, compared with the material used to form subpoverty, the elastomeric material used to form the printing surface, which meet the lower hardness Durometer and tensile strength and higher elongation.

In addition, blanket, such as described above is generally provided with a rough surface profile in an attempt to reduce the increasing size of the dot, while maintaining good properties returns the paint for the blanket. These profiles roughness in the past made either by molding in the process of curing or processing utverzhdenii the surface of the medium or coarse sandpaper, which is known in the prior art. After that, the surface profile is measured, for example, a device known as a profilometer (manufacturer, Perthen Corporation), which is also known in the prior art. The surface profiles of laminated printing surfaces of the blanket of the prior art typically have average roughness (i.e. RA) of 1.0 to 1.8 microns, while the cast blanket that do not have good properties, selection, usually have a RA of 0.3-0.5 microns. In this regard, it is important to note that the higher the average number of roughness, the worse becomes the print quality due to decreasing homogeneity of points.

In the fabric 10 of the present invention, however, the average number of roughness printing surface 70 is reduced to a value above approximately 0.6 microns but less than about 0.95 microns and preferably between approximately 0.7 and 0.9 micron, polished thin on the suburban paper. The advantage of this treatment is that it provides excellent properties of impact colors offset the canvas, and also leads to an improved structure of printed dots, thus providing improved print quality and value for paints blanket of the invention. This effect can also be achieved a number of additional methods known in the prior art, such as molding.

EXAMPLES

Example 1.

The adhesive was air-conditioned in an oven at 85°C for 2 hours before coating. Samples were prepared by coating S/4195 (main layer) shows a model for the amount of K/R to 0.010 inch. S/4200 (middle layer) was then pressed/glossy-covered main layer. The samples were allowed to cure for 24 hours.

The polyurethane composition was heated at 120°C for two hours. The middle layer of the frame is then covered shows the composition of polyurethane (PU) when the amount of K/R to 0.035 inch. The top layer S/4232 then eliminirovali in hot glue. The sample was allowed to cure for 72 hours.

These polyurethanes obtained:

CompositionViscosity (cps) at 100°CMicrospheres, wt.%
A (SG 1516-31) 294002,0
B (SG 1516-32)436002,5
C (SG 1516-33)342003,0
D (SGH 0005-3A)SGH0005-3A

The viscosity was measured by flow viscometer Brookfield TT-100. The caliber was measured table micrometer Cady or device Cady. Microspheres E130-095AD produced Dualite, used in a compressible polyurethane layer. Following frames blanket made using the proposed composition, and obtained the following results:

FrameThe adhesive layerCompressible layerCaliberStress (kg/cm2)
1D (SGH 0005-3A)A (SG 1516-31)0,04950,1
1D (SGH 0005-3A)A (SG 1516-31)0,05140,6
2D (SGH 0005-3A) B (SG 1516-32)0,05145,1
2D (SGH 0005-3A)B (SG 1516-32)0,05039,0
3D (SGH 0005-3A)C (SG 1516-33)0,05135,3
3D (SGH 0005-3A)C (SG 1516-33)0,05134,3

Example 2.

Glue was kondicionirovanie in a drying Cabinet at 120°C for 2 hours before coating. Samples were prepared, covering S/4195 (main layer) shows a model for the amount of K/R to 0.010 inch. S/4200 (middle layer) and then pressed/eliminirovali covered in the core layer. The samples were allowed to cure for 24 hours.

The polyurethane composition was heated at 120°C for two hours. The middle layer of the frame is then covered shows the composition of the polyurethane in the amount of K/R to 0.045 inches. The top layer S/4232 then eliminirovali in hot glue. The sample was allowed to cure for 96 hours. Compressible polyurethane layer contained microspheres Dualite E-095 AD.

These polyurethanes obtained:

CompositionViscosity (cps) at 100°CSetting time (C)Microspheres, wt.%
A (SG 1516-137)12200240
B (SG 1516-138)11270550
C (SG 1516-144)23950600
D (SG 1516-148)65000106
E (SG 1516-149)62800306

The viscosity was measured by flow viscometer Brookfield TT-100. The caliber was measured table micrometer Cady or device Cady. Microspheres E130-095AD produced Dualite, used in a compressible polyurethane layer. Following frames blanket made using the proposed composition, and got the following results:

FrameThe adhesive layerCompressible layer CaliberStress (kg/cm2)
1A (SG 1516-137)D (SG 1516-148)0,055529,69
2A (SG 1516-137)E (SG 1516-149)0,055529,56
3B (SG 1516-138)D (SG 1516-148)0,055528,64
4B (SG 1516-138)E (SG 1516-149)0,059026,31
5C (SG 1516-144)D (SG 1516-148)0,054025,21
6C (SG 1516-144)E (SG 1516-149)0,053027,21

Example 3

Glue was kondicionirovanie in a drying Cabinet at 120°C for 2 hours before coating. Samples were prepared, covering S/4195 (main layer) shows a model for the amount of K/R to 0.010 inch. S/4200 (middle layer) and then pressed/glossy lamination is Ali covered in the core layer. The samples were allowed to cure for 24 hours.

The polyurethane composition was heated at 120°C for two hours. The middle layer of the frame is then covered shows the composition of the polyurethane in the amount of K/R to 0.045 inches. The top layer S/4232 then eliminirovali in hot glue. The sample was allowed to cure for 96 hours.

These polyurethanes obtained:

CompositionViscosity (cps) at 100°CSetting time (C)Microspheres, wt.%
A (SG 1516-148)65000106
B (SG 1516-149)62800306

The viscosity was measured by flow viscometer Brookfield TT-100. The caliber was measured table micrometer Cady or device Cady. Microspheres E130-095AD produced Dualite, used in a compressible polyurethane layer. Following frames blanket made using the proposed composition, and got the following results:

FrameThe adhesive layer Compressible layerCaliberStress (kg/cm2)
1A (SG 1516-148)A (SG 1516-148)0,055to 20.28
2B (SG 1516-149)B (SG 1516-149)0,05522,89

Example 4

Glue was kondicionirovanie in a drying Cabinet at 120°C for 2 hours before coating. Samples were prepared, covering S/4195 (main layer) shows a model for the amount of K/R to 0.010 inch. S/4200 (middle layer) and then pressed/eliminirovali covered in the core layer. The samples were allowed to cure for 24 hours.

The polyurethane composition was heated at 120°C for two hours. Layer the middle of the frame then covered shows the composition of the polyurethane in the amount of K/R to 0.045 inches. The top layer S/4232 then eliminirovali in hot glue. The sample was allowed to cure for 96 hours.

These polyurethanes obtained:

CompositionViscosity (cps) at 100°CSetting time (min)Microspheres, the EU.%
A (SG 1516-188)274003,0-6,0 min0
B (SG 1516-189)278003,5-6,5 min0
(SG 1516-193)528003,5-6,0 min6
D (SG 1516-194)502502,0-3,0 min6

The viscosity was measured by flow viscometer Brookfield TT-100. The caliber was measured table micrometer Cady or device Cady. Microspheres E130-095AD produced Dualite, used in a compressible polyurethane layer. Following frames blanket made using the proposed composition, and got the following results:

FrameThe adhesive layerCompressible layerCaliberVoltage
1A (SG 1516-188)(SG 1516-194)0,05420,02
2 B (SG 1516-189)(SG 1516-193)0,05920,07

Additionally, the frame #1 showed the adhesion between the lower layer and the Central layer of 2.7 pounds/inch. Frame #1 also had the adhesion between the Central layer and the top layer of 13.1 pounds/inch.

1. The frame of the printing blanket comprising in order: a substrate of tissue of the foot, including at least one fabric layer, each layer specified has many fibers or threads of the warp and weft; compressible layer above a specified substrate, comprising a moisture-curable thermosetting polymer in the form of polyurethane, polyurea, or a mixture thereof, having a multitude of closed cells distributed essentially uniformly in it, so that the layer has an essentially uniform compression characteristics; and fabric upper stop button located on top of the compressible layer that includes at least one fabric layer, each layer specified has many fibers or threads of the warp and weft.

2. The frame according to claim 1, in which these closed cells formed from microspheres having a diameter from about 1 to about 200 microns, and these microspheres dispersed relatively evenly at the specified compressible layer.

3. The frame according to claim 2, in which pointed to by the second compressible layer contains from about 1 to about 10 wt.% microspheres.

4. The frame according to claim 3, wherein said compressible layer contains about 6 wt.% microspheres.

5. The frame according to claim 1, in which at least one specified substrate of tissue of the foot or the specified upper tissue stop includes at least two fabric layers, and these layers of contact adhesive, and the adhesive layer are selected from the group consisting of thermoplastic resins, thermosetting resins, polyurethanes, natural elastomers, synthetic elastomers, or combinations thereof.

6. The frame according to claim 5, wherein said adhesive layer has a multitude of closed cells distributed therein, essentially uniformly, so that the layer has an essentially uniform compression characteristics.

7. The frame according to claim 6, in which these closed cells formed from microspheres having a diameter from about 1 to about 200 microns, and these microspheres dispersed relatively evenly at the specified compressible layer.

8. The frame according to claim 7, wherein said compressible layer contains from about 1 to about 10 wt.% microspheres.

9. Frame of claim 8, wherein said compressible layer contains about 6 wt.% microspheres.

10. A method of manufacturing a compressible frame of the printing blanket comprising the stage of: providing a substrate of tissue of the foot, Lucaya, at least one fabric layer, each layer specified has many fibers or threads of the warp and weft; coating the specified substrate of the tissue of the foot compressible layer comprising a single moisture-curable thermosetting polymer in the form of polyurethane, polyurea, or a mixture thereof, having a multitude of closed cells distributed essentially uniformly in it, so that the layer has an essentially uniform compression characteristics; and gluing the third fabric layer to the specified compressible layer.

11. The method according to claim 10, in which these closed cells formed from microspheres having a diameter from about 1 to about 200 microns, and these microspheres dispersed relatively evenly at the specified compressible layer.

12. The method according to claim 11, wherein said compressible layer contains from about 1 to about 10 wt.% microspheres.

13. The method according to item 12, wherein said compressible layer contains about 6 wt.% microspheres.



 

Same patents:

FIELD: printing.

SUBSTANCE: gasket for offset cylinder of printing machines contains at least one inelastic polyester-based layer and at least one polyurethane elastomeric layer. The said layers are connected inseparably together. The polyurethane elastomeric component has certain chemical/physical characteristics.

EFFECT: ecological compatibility; antipyrine properties; resistance to solvents and mechanical stress; good machinability by mechanical means; durability; significant degree of universality use; good modifiability of the cylinder and elastic flexibility; improved constructional configuration of the printing contact zone; significant degree of uniformity of the image elements spreading on the raster and improved printing stability.

5 cl, 3 dwg

FIELD: printing.

SUBSTANCE: invention relates to offset cylinder and method of its production, as well as to the gravure machine. The gravure machine comprises a plate cylinder with printing plates with deep-gravure printing elements corresponding to gravure printing structure to be printed on the base, the gravure cylinder interacting with the printing cylinder. The offset cylinder incorporates, at least, one offset blanket whereon multi-colour ink is rolled by means of selector cylinders. A preset colour ink is applied onto every selector cylinder, the ink being fed from the ink device coupled thereto. Note, that every selector cylinder has recesses corresponding to the gravure printing structure and that should be filled with ink of the said preset colour. Note here, that, at least one said offset blanket contains, at least, lipophilic surface layer with recesses or lipophobic surface layer with recesses, including sections with and without recesses corresponding to the gravure printing structure and that should be filled with ink of the said preset colour.

EFFECT: higher accuracy of the ink application, optimised consumption of the ink.

6 cl, 7 dwg

FIELD: tympan of vibrating roller, printing apparatuses of printing machine.

SUBSTANCE: tympan on lateral surface of roller, for example roller of printing apparatus has elastic and(or) compressible layer whose contact stress P depends upon value of depression. Said layer is formed in such a way that to provide relationship of contact stress from depression value grown up to 700 N/cm2 at least in separate zones.

EFFECT: possibility for providing by simple means high quality of printed products due to lowered response to vibration and to distortion of printing process.

46 cl, 8 dwg

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

FIELD: tympan of vibrating roller, printing apparatuses of printing machine.

SUBSTANCE: tympan on lateral surface of roller, for example roller of printing apparatus has elastic and(or) compressible layer whose contact stress P depends upon value of depression. Said layer is formed in such a way that to provide relationship of contact stress from depression value grown up to 700 N/cm2 at least in separate zones.

EFFECT: possibility for providing by simple means high quality of printed products due to lowered response to vibration and to distortion of printing process.

46 cl, 8 dwg

FIELD: printing.

SUBSTANCE: invention relates to offset cylinder and method of its production, as well as to the gravure machine. The gravure machine comprises a plate cylinder with printing plates with deep-gravure printing elements corresponding to gravure printing structure to be printed on the base, the gravure cylinder interacting with the printing cylinder. The offset cylinder incorporates, at least, one offset blanket whereon multi-colour ink is rolled by means of selector cylinders. A preset colour ink is applied onto every selector cylinder, the ink being fed from the ink device coupled thereto. Note, that every selector cylinder has recesses corresponding to the gravure printing structure and that should be filled with ink of the said preset colour. Note here, that, at least one said offset blanket contains, at least, lipophilic surface layer with recesses or lipophobic surface layer with recesses, including sections with and without recesses corresponding to the gravure printing structure and that should be filled with ink of the said preset colour.

EFFECT: higher accuracy of the ink application, optimised consumption of the ink.

6 cl, 7 dwg

FIELD: printing.

SUBSTANCE: gasket for offset cylinder of printing machines contains at least one inelastic polyester-based layer and at least one polyurethane elastomeric layer. The said layers are connected inseparably together. The polyurethane elastomeric component has certain chemical/physical characteristics.

EFFECT: ecological compatibility; antipyrine properties; resistance to solvents and mechanical stress; good machinability by mechanical means; durability; significant degree of universality use; good modifiability of the cylinder and elastic flexibility; improved constructional configuration of the printing contact zone; significant degree of uniformity of the image elements spreading on the raster and improved printing stability.

5 cl, 3 dwg

FIELD: printing industry.

SUBSTANCE: frame of print blanket includes substrate, compressible layer and upper textile bundle. Substrate of textile bundle comprises at least one textile layer. Each layer has multiple fibres or threads of warp and woof. Compressible layer includes moisture-hardened thermosetting polymer in the form of polyurethane, urea resin or their mixture. Compressible layer contains multiple evenly distributed closed cells and has uniform characteristics of compression. Compressible layer is applied over substrate. Upper textile bundle comprises at least one textile layer. Each layer has multiple fibres or threads of warp and woof. Textile bundle is applied over compressible layer. Method has also been proposed for manufacturing of compressible frame of print blanket.

EFFECT: invention makes it possible to reduce time for preparation and hardening of print blanket.

13 cl, 1 dwg, 8 tbl, 4 ex

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