A method of obtaining a compressible printing material, a compressible layer, compressible printed canvas
(57) Abstract:The invention relates to the manufacture of laminated printed (stamp) cloth with compressibility and elasticity. Defined characteristics of compressibility printed fabric 5 are provided by the presence of the intermediate layer 10 having essentially uniform distribution of pores 30 is almost the same size. Layer located between the layer of the framework 25 and the working surface 15 of the printed fabric. The pores 30 of compressible intermediate layer 10 is formed by dispersion in the elastomeric matrix 35 sets of microspheres with a high melting point. Using high-melting microspheres of a thermoplastic resin or thermoplast. Containing microspheres elastomeric matrix 35 is applied on the top surface layer of the framework 25 and produce a cure of the coated layer basics at a temperature of about 80 - 150oC for 1 6 h with the formation of the compressible layer having almost uniform compressibility. All the layers of fabric connected with the formation of the Assembly reinforced compressible fabric and produce the final vulcanization with obtaining the laminated printed canvas. 3 C. and 32 C.p. f-crystals, 1 Il. The invention relates their thermoplastic microspheres for use in obtaining paintings.Well known is the use of printed canvases (stamp pad) in printing technology, such as, for example, offset printing, in which these canvases perform the primary function of the transfer printed (ink) of the ink from the printing cliche on paper. =Such printed cloth very carefully formed so that the surface of the canvas receives no defects or mechanical contact of the blade with a stamp, or by chemical reaction with the ingredients of printing ink or other solvents used in the printing process. Repetitive mechanical contacts cause a certain degree of compression fabric, which, however, must be maintained within acceptable limits so that exactly reproduced the image.It is also important that the canvas had elasticity, i.e. that it was able to eventually recover its original thickness, whereby is provided an image transfer constant quality, despite the degree of usage, which is subjected to the canvas.Printed canvases typically contain on their lower surface of the substrate or core material, which ensures the integrity of the canvas. To obtain this basis prepact the Ani (the term "layer" and "layer" are used here interchangeably). Printed or working surface of the top fabric, i.e., the surface that actually contacts the printed ink is usually a layer of elastomeric material such as rubber. Used herein, the terms "upper" or "top" refers to the part of the individual layers or the entire canvas, which is the farthest from the cylinder of the printing strain when the canvas is set up at him.On the contrary, the terms "lower" or "bottom" are used in relation to those parts or a separate layer, or paintings that are closest to the cylinder when installing the blade.The printed surface is traditionally performed during calendering or molding of rubber layers on the basis of (basic layer) until the desired thickness of the material, after which the Assembly is cured with the finished paintings. These canvases are suitable for many applications, but they often lack the necessary compressibility and elasticity required for other applications. So you want to get the canvas with a higher compressibility and improved elasticity.It is difficult, however, to obtain such improved compressibility using standard construction described above, because viscoelastic the surface, without causing deformation or stretching of the fabric in the areas adjacent to the point of compression. If there are irregularities in printing cliche, printing machine or the paper compress, which is exposed to the canvas, it will be very different in the process of printing machines, and non-uniformity will increase in the absence of compression in printed canvas, so the key is to produce printed cloth having the required compressibility and elasticity, is in the creation of the compressible layer.In particular, it is known that the inclusion of at least one layer of material containing a compressible layer of the elastic polymer in the printed canvas, you can avoid such problems printing, which is described above, and also "blur", i.e. the lack of clarity caused a small standing wave on the surface of the printed fabric adjacent to the clamping of the printing machine.This compressible layer can serve to absorb the "shock", i.e. a significant deformation of the fabric, caused by a transient increase in the thickness of the material intended for printing, as a result, for example, the accidental introduction of more than one sheet of paper during the printing operation.With the introduction of the compressible layer in the canvas "kick" can be absorbed by the lane which helps preserve the print surface and thickness during the printing operation when restoring a normal sheet thickness after compression by the clamping of the printing machine.In the technique known many different receiving the compressible layer in the printed canvas.For example, the compressible layers are obtained by displacement of the granular particles of salt with the polymer used for the receiving layer, and then leaching the salt from the polymer to create it then. This method is described by Haren and others in the U.S. patent N 4025685. The pores in the underlying compressible layer, thus, provide a positive displacement of the surface layer, without causing its deformation, as is the volumetric compression, and the offset is almost perpendicular to the strike of the printing machine.Other methods, such as use of compressible fibrous structures were tested previously for receiving the compressible layers. Examples can be found at Doucette and others in the U.S. patents NN 3887750 and 4093764. Rodriguez (U.S. patent N 4303721) describes compressible canvas, made using pore-to create pores in the compressible layer. Another method, involving the use of rubber particles to create long considered by Rodarmer in U.S. patent N 3795568.The formation of pores with the use of pore-formers, however, has disadvantages in that the formed pores and their internal connections tchasnogo paintings with greater compressibility and less elasticity, than adjacent areas, which causes a deformation in the printing process.In addition, the above-described technology of leaching salt also has drawbacks, due to the fact that the particle sizes are limited and the method is difficult, time consuming and expensive.Recently, it is preferable to obtain a printed cloth having a compressible layer comprising a porous elastic polymer having cells or pores in the compressible layer is formed using a discrete chip. Thus, in particular, found the benefits of obtaining a compressible layer by the introduction of hollow thermoplastic microspheres in the polymer, as shown by Larson in U.S. patent N 4042743. These microspheres are elastic and, thus, give a layer of good compressibility characteristics.However, in the known methods of obtaining compressible layer using a thermoplastic microspheres for printed fabric, it was found that the thickness of the formed compressible layer is difficult to be controlled, as usual thermoplastic microspheres melt at normal temperature processing and vulcanization.As such microspheres melt until completion volaemic microspheres, as well as the variance of the pore size. This can affect the overall performance of the blade. In addition, variations in pore sizes can weaken the printed sheet, causing premature wear.Govorovsky and other U.S. patent N 4770298, tried to solve the problem by the introduction of an elastomeric mixture used to prepare the matrix of the microspheres in the compressible layer, accelerator capable of curing to an elastomer mixture at a temperature below the melting point of the microspheres. The use of such relatively low temperature during the vulcanization process, however, leads to the need for additional periods of vulcanization with a simultaneous increase in cost, i.e. including the cost of the accelerator, and the complexity of manufacturing cloth.Shrimpton and others, U.S. patent N 3700541 and corresponding UK patent N 1327758 describe that microspheres made of high temperature thermoeconomics plastics, allow you to be cured layer using conventional high-temperature processes of vulcanization.However, these microspheres are less elastic than thermoplastic microspheres, so that the properties of compressibility of the layer deteriorate.The present invention is a method of obtaining a compressed layer of thermoplastic microspheres with a high melting point for use in the formation of the compressible printing cloths, having improved compressibility and elasticity.The invention also provides a method of obtaining a laminated paintings by forming base (base layer) and the surface layer and by placing between them the intermediate compressible layer, which is formed through the introduction of a high-melting thermoplastic microspheres in an elastomeric matrix.In accordance with the method (according to the invention) microspheres formed from thermoplastic materials having a melting point above 135oC, mixed with the elastomeric matrix in a period of time sufficient for an almost uniform distribution of the microspheres. This contains microspheres compound for the subsequent desired thickness.Reinforcing fabric layer can then be deposited on the surface of the compressible layer, and the Assembly is cured at ordinary temperatures, and during the intervals for the partial curing of the compressible layer, thus, essentially locking the position of thermoplastic microspheres in the matrix.The Assembly is compressible layer can then be laminated on its lower surface at least one additional layer of fabric substrate on its upper surface with an elastomeric printing or "working" surface.In addition, additional fabric or elastomeric layers used for special applications, can be introduced into the canvas, above or below the elastomeric layer if necessary.Whole printed sheet is formed and then the final curing the entire Assembly of the canvas under controlled heat and pressure are well known manner. The finished laminated printed sheet contains at least one layer basics, printed or work surface layer and an intermediate compressible layer located between them.The intermediate layer has a honeycomb structure with closed cells essentially constant are closely linked to each other.The drawing shows a cross section of a typical printed fabric that contains a compressible layer obtained in accordance with the invention.The drawing shows a typical printed sheet 5, which contains a compressible layer 10 obtained in accordance with the present invention.Laminated printed sheet 5 includes, from top to bottom at least a working surface layer 15, a reinforcing fabric layer 20, the compressible layer 10 and at least one layer of a fabric substrate 25 (base).Specialists will be clear that the number and types of layers used, in particular, the number of tissue layers located above and below the compressible layer may vary depending on the applications for which it is intended the canvas.Pores 30 in the compressible layer 10 obtained as described below, make possible the displacement of the surface layer 15 of the canvas without distortion in the working conditions.As shown in the drawing, the pores 30 are essentially the same size and uniform distribution and is not interconnected. It was found that the pore size 30 molded into the compressible layer 10, are typically in the same range as the size of the microspheres, the diversified technology, stabilizing, strengthening and hardening additives, which need not be described here since they are well known in the art and are contained in the formulation in accordance with their specific application.In addition, it is also known that this formulation differs from the one used for the printing surface, as well as two layers require different characteristics. For forming the compressible layer can be any suitable polymeric material, such as rubber or rubber compound, which are cured or vulcanized materials, for example, natural rubber, rubber is the best choice (BSC), ethylene-propylene-non-conjugate diene terpolymeric rubber (SEPT), butyl rubber, nitrile rubber (BOC), polyurethanes, etc.Most preferred is an elastomer which is resistant to solvents and printing ink, such as 100% nitrile rubber. An alternative may be used a mixture of nitrile and neoprene rubber, such as nitrile gloves : neoprene = 40 : 60 : can also be used neoprene rubber.Layers of fabric 20 and 25 containing fiber basics 55 and weft fibers 60, have done is to implement processing machine blade, and are high-grade cotton yarn, which is free from swelling and knots, weaving defects, bubbles and so on, the Fabric may also be a synthetic material such as rayon, nylon (polyamide), polyester, or their mixture. Typically the tissue layer has a thickness of about 0.003 to to 0.016 inches.Fabric suitable for use in obtaining printed fabrics, containing compressible layer according to the present invention (in addition to those given in the example below), include, but are not limited to, those listed Larson and others in the U.S. patent N4042743, described herein as a specific reference.The bottom fabric layer 25 and other optional tissue layer (s), such as a fabric layer 20, are thoroughly saturated with the coating material 65 with obtaining tissue repulsive printing ink, water and solvent.The coating material 65 is preferably ftoruglevodorodnye solvent-based or water and has such a low viscosity, i.e., essentially the same as the viscosity of water, to allow the full permeability of the thus treated fabric layer (s).This processing by the NAS is her environment through internal channels in the tissue.Thus, it is no longer required, as in current practice, to seal the cut ends of the fabric. Alternative together ftoruglevodorodnyh material can be used numerous other materials such as silicone compounds having a similar resistance to water and solvents.Instead of tissues described above for use in the formation of tissue layers for the introduction of a printed sheet containing a compressible layer, according to the invention can be used a number of alternative fabrics, both natural and synthetic, including those that have the number of fibers different from the one considered in the example below, to the extent that these materials possess the necessary degree of tensile and bursting strength.In addition, materials such as foam sheets, paper or rubber, having the proper characteristics, can also be used instead of the above tissues.Compressible layer 10 is obtained by dispersion in the above-described elastomeric mixture 35 many thermoplastic microfiber with a high melting point and applying the mixture on the upper surface of layer fabric substrate, prepostional consistency for spreads by adding solvent. Then the number of layers in the mixture is applied to the fabric to obtain the compressible layer 10 of the desired thickness. When applied to each layer, it thickens, but not mixed. Compressible layer 10 may have a thickness of from about 0.004 to 0,030 inch, although it is preferable that the layer was approximately 0,011 - a 0.012 inch in thickness.Alternative instead of the technology spreads for contacting the fabric with an elastomeric matrix containing microspheres, if necessary, can be used calendering, extrusion, dipping, or any other known means.As indicated above, the microspheres for use in the present invention are obtained from a thermoplastic resin. However, the main requirement is that the specific thermoplastic resin (resin) must be and remain stable at high temperatures, i.e. above about 135oC (275oCF), to ensure processing in typical curing temperatures of the canvas without melting, deformation or destruction. The terms "high-melting" and "high melting point" used in this description and in respect of such materials.As shown above, existing technologies indicate that the low-melting thermoplastic microspheres are wulkanizacja requires special techniques (for example, increased vulcanization time). Additionally, the existing technology also indicate that although thermotherapies microspheres can be used with confidence for the stage of vulcanization, but these microspheres are not as elastic as thermoplastic microspheres.The present invention provides a significant improvement in these known compressible layers as high-melting thermoplastic microspheres have better elasticity than thermotherapies microspheres, as well as allow the use of short high-temperature regimes vulcanization without fear of degradation of the microspheres.Thermoplastic resin with a high melting point, which are acceptable for use in the invention include, but are not limited to, vinylidenechloride the homopolymers and copolymers, in particular mixtures of vinylidenechloride with vinyl chloride, acrylates or NITRILES; fluoropolymers, such as PTFE (polytetra - veratile), FEP (fluorinated ethylene propylene) copolymers, and perforamce - (PFA) resin, PTFE (polychlorotrifluoroethylene), EHTPA (ethylenchlorhydrine) copolymer, ETFE - (ethylene-tetrafluoroethylene) copolymer, PVDF (polyvinylidene fluoride), PVF (polyvinyle is you; polybenzimidazole; polycarbonates; thermoplastic polyesters such as pbtf was honored with (polybutylene terephthalate), PCHDTV (polycyclohexylenedimethylene) and PET (polyethylene terephthalate); polyetherimide; RAP (polymethylene); the modified PFD (Polyphenylene oxyde); SFC (polyster); polypropylene; chlorinated PVC (polyvinyl chloride); and mixtures thereof.A number of types of thermoplastic microspheres suitable for use in the invention is at present commercially available. The preferred microspheres are delivered by the company "Expancel of Sundavall, Sweden under the brand names "Expancel" 091 DE and "Expancel 091 DU", where "DE" means "dry foam" and "DU" - "dry nespevnena". These microspheres contain a copolymer of Acrylonitrile, Methacrylonitrile and methyl methacrylate and pentane as solvent.High-melting thermoplastic microspheres used in the invention preferably have a diameter typically in the range of about 1 to 200 microns and more preferably about 50 to 130 μm, and especially preferred is the average size of about 90 microns. Basically microspheres are uniformly dispersed in the elastomer by mixing in such a way as to avoid any appreciable crushing.Optionally, the microspheres can have a surface treatment to facilitate their coupling with the matrix material. Materials for use in forming such coatings include talc, calcium carbonate, zinc oxide, titanium dioxide, mica, calcium sulfate, barium sulfate, antimony oxide, clay, silica and aluminum trihydrate.In a preferred embodiment of the invention, therefore, the pores 30 of compressible layer 10 are formed of high-melting thermoplastic microspheres having a melting point above about 135oC (275oF).It is established that these microspheres provide significantly improved performance in the curing process, i.e., allow the use of significantly higher temperature for a much shorter time than previously possible with low-melting microspheres used in the famous paintings, and avoid the use of accelerators.TRAI is of particular importance as the complexity, and the cost of the curing process, and therefore, the operation in General. The vulcanization process used for curing the expected layer 10, is shown below.Preferably avoid the presence of water during the injection of the microspheres in the elastomer in order to avoid the expansion of water vapor during any subsequent heating of the polymer. For this reason, the microspheres preferably dried before mixing with the elastomer.The printing surface layer 15 is formed by the method spreads described above, however, use elastomeric compound, suitable for the working surface of the printed fabric. An example of this is a mixture of nitrile/polysulfide mixture. To obtain a hard surface layer of the desired thickness, usually require several layers of elastomeric mixture. In General, the surface layer is in a thickness of about 0.005 to 0.025 inches, preferably about 0,010 - of 0.015 inches in thickness. Most preferably, the surface layer has a thickness within a 0.012 - of 0.015 inches.To improve the interfaces between the various layers (layers) in line 5, it is preferable to use the adhesive layers 40, 45 and 50. As adhesive layers for elastomer, known in the art.Preferably as an adhesive you can use the same elastomer used for the matrix compressible layer. When applying adhesive to any of the layers of fabric it is usually smeared on sleeppromoting car, although this method can be replaced by any alternative technology, which gives the same result. The adhesive is applied in layers until the desired thickness.The stage of obtaining a printed material, containing a compressible layer of the invention, below.In a typical printed canvas, i.e., "typical" in that it usually contains at least (as described above) fabric substrate 25, the working surface 15, a reinforcing fabric layer 20 and the compressible layer 10 located between the fabric layer 20 fabric substrate 25, and the adhesive layers 40, 45 and 50, preferably, of a compound based on a nitrile rubber (but which can independently be selected from a number of adhesives water-based and solvent) are used to connect the layers together.The adhesive layer 50 is smeared on the upper surface of the first fabric substrate 25. Compressible layer 10 is formed and then the mixture for about 30 minutes high what about the material and, preferably, 2 to 70% by weight of the microspheres, after which the mixture is spread on the adhesive layer 50.In General, to obtain a desired thickness of the compressible layer, i.e., about 0,008 - of 0.015 inch, the required number of layers of the mixture. Individual layers of a thickness of about 0.002 inch are suitable for this application.In addition, the coupling between the tissue layer of the substrate 25 and the compressible layer 10 may be implemented in alternative or additional chemical reaction taking place between the two layers and initiated during the subsequent curing process, as described here.The compressible layer is then cured; this layer to dry (felonious) in a heating Cabinet, after which it is subjected to elevated temperatures of at least about 80oC, for vulcanization of elastomer mixture to a degree sufficient to obtain the structure of the polymer matrix with a fixed arrangement of microspheres.Alternative instead of rastonirovali expected layer can be overiden well known drum technology or a continuous method of curing, such as curing rotocure or curing using a double belt press.
oC is sufficient. Optionally, the compressible layer may be air-conditioned, i.e., preheated in one or more stages at temperatures lower than the temperature of vulcanization, prior to the actual operation of vulcanization. This helps to ensure that the whole mass of the compressible layer was uniformly heated to the heating at the actual temperature vulcanization (i.e., about 135oC) in which the location of the microspheres in the matrix becomes fixed.In a preferred embodiment of the invention all parts of the elastomer which forms the compressible layer essentially completely bound at the stage of vulcanization (all the canvas as a whole is undergoing additional vulcanization as described below) to ensure the preferred modulus of elasticity and plasticity and other elastic properties of the elastomer.Of course, specialists in the art it is clear that in the resulting rubber stitching is an ongoing process and there is no rubber material ever fully stitched. In this regard, seat to be interrupted until the optimum vulcanization, while the elastomeric matrix containing microspheres, may be not to have a system that is sufficient for the "freezing" of the microspheres in their field, even when it turns out an acceptable product. Such "partial" vulcanized compressible layer can get a better blended with the layer of the substrate and the printed surface while forming a laminar cloth.The specialist will also be clear that sively layer, which will be substantially completely vulcanized, may be crosslinked with a layer of substrate and surface layer with an adhesive, specially selected for this purpose.After curing compressible layer 10 of the second adhesive layer 45 is then wound on the upper surface of the compressible layer 10 and it is one way of reinforcing fabric layer 20. These layers are then attached to the second adhesive layer. Then the reinforcing layer 20 may be laminated from the lower side of the working surface 15 using, for example, the adhesion layer 40. The connection is usually performed using laminating rolls.Accurate sheet structure can of course be changed in accordance with the intended use. For example, instead of a single layer fabric substrate can be used two layers, or may in the are adjacent the surface to each other, i.e., the bottom surface of one such layer remains above the surface of the fabric layer placed directly below, with the possible, i.e., an optional add between the adhesion layer to facilitate communication between the layers.In addition, it is desirable to provide additional reinforcing fabric layers (such as those described above) between the working surface and a compressible layer 10. This arrangement protects the compressible layer from heavy loads, usually taking place on the printed surface, thereby providing a high degree of resistance to the destruction of the canvas.The resulting Assembly (package) cloth then finally cures are well known in the art for this purpose by way of vulcanization at a temperature of from about 132 to 160oC and preferably at 143 - 149oC for from half an hour up to 16 hours at a pressure ranging from atmospheric up to 6 kg/cm2. These variations depend on the exact composition of the mixture.In addition, at the stage of vulcanization of a cloth before putting it in the vulcanizing furnace in contact with the surface of the printed canvas together with fine talcum powder may be smooth paper tape (tape), with a net Note printed canvas. For many applications the finish given thus printed canvas paper, will be sufficient for use without additional grinding surface.However, if necessary, the working surface can be polished by the material or coarse-grained abrasive cloth and to obtain the corresponding surface profile to determine the application. Such surface profiles are usually measured by a device called a profilometer, which is well known in the art.As noted above, the curing of the intermediate compressible layer at temperatures above approximately 80oC determines that the high-melting termoplastici microspheres are trapped in the stationary or steady-state (stable) provisions in the elastomeric matrix. Since the position of the microspheres in the matrix are established (sustained), the provisions of the pores created by the microspheres are, thus, the position of the microspheres in the matrix.Therefore, when assembled in the package, the fabric is the final stage of vulcanization, has already established the structure of the intermediate layer retains its shape and prevents agglomeration of the pores or the number of the example does not limit the invention and is provided only for purposes of illustration).The example describes the individual stages and materials that can be used in implementing the preferred method of the invention described herein.Fabric
The composition of the yarn:
Base: 18 (2-ply long staple staple cotton).Ducks: 20 single Polynosic silk.The expense yarn:
Base - 22 /cm
Ducks - 222/ cm
Weight: 21010 g/kg2< / BR>Caliber: 38 / 100 mm
Basis - 140 kg/5 cm
Ducks - 55 kg/5 cm
The permanent elongation at tensile: 1,8%.The environment of the receiving cells
High-melting thermoplastic microspheres Expancel 091 DE.The elastomeric matrix
100% nitrile rubber.The method of forming a compressible layer of the invention is described as follows:
1. Microspheres thoroughly mixed and dispersed in the elastomeric material used for forming the matrix compressible layer at a content of about 3% by weight of elastomeric material.2. The resulting mixture was then smeared serial fabrics through clearmeadow machine until the elastomer layer reaches the desired thickness.3. Coated fabric then astonished in the furnace and the volcanic mountain rage is in when 93 - 127oC, then 15 min at a temperature of 127 - 135oC; then 3 1/4 - at a temperature of 135oC.The compressible layer can then be used in obtaining the printed fabric in accordance with the method described above.In addition, the above description is only an illustration of the invention and other parameters and options can be used without straying from the concepts of the invention. Accordingly, the invention is limited only by the attached claims. 1. A method of obtaining a compressed printed canvases, including education components of the material of the fabric layer basics, elastomeric printing surface and a compressible layer containing an elastomeric matrix having a honeycomb structure that includes many closed cells formed from a variety of thermoplastic microspheres, and vulcanization, characterized in that the elastomeric matrix is dispersed essentially uniformly many thermoplastic microspheres having a melting point of 135oand above, is applied at least one layer containing microspheres matrix essentially uniform thickness on the surface of the fabric layer framework for formirovaniia substantive provisions of the high-melting thermoplastic microspheres in the matrix and forming a compressible layer with providing microspheres essentially uniform compressibility of the layer.2. The method according to p. 1 characterized in that it further connect the reinforcing fabric layer with essentially the entire surface containing microspheres matrix to form an Assembly intermediate compressible layer.3. The method according to p. 1, characterized in that the use of high-melting thermoplastic microspheres of a thermoplastic resin selected from the group consisting of vinylidenechloride of homopolymers and copolymers, fluoropolymers, polyaryletherketones, nitrile resins, polyamideimide, polyacrylates, polybenzimidazoles, polycarbonates, thermoplastic polyesters, polyetherimides, polyamides, polymethylpentene, modified polyphenyleneoxides, polyphenylensulfide, polypropylene, chlorinated polyvinyl chloride and mixtures thereof.4. The method according to p. 1, characterized in that the use of high-melting termoplastici microspheres of a thermoplastic selected from the group consisting of copolymers of Acrylonitrile, Methacrylonitrile and methyl methacrylate.5. The method according to p. 1, wherein the high-melting thermoplastic microspheres dispersed in the matrix in the amount of 1 to 90% by weight of the matrix.6. The method according to p. 1, wherein the high-melting thermoplastic microct choose thermoplastic microspheres with a diameter of 1 to 200 microns.8. The method according to p. 1, characterized in that vibiraut thermoplastic microspheres with a diameter of 50 to 130 μm.9. The method according to p. 1, characterized in that provide microspheres surface coating to facilitate connection to the matrix.10. The method according to p. 9, characterized in that the coating is chosen from materials selected from the group consisting of talc, calcium carbonate, zinc oxide, dioxide Tatana, mica, calcium sulfate, barium sulfate, oxide, antimony, clay, silicon, three-hydrate of aluminum and mixtures thereof.11. The method according to p. 1, characterized in that when the vulcanization is conducted at least one stage of pre-heating or temperature control, which is carried out at 80oC.12. The method according to p. 1, characterized in that the connecting reinforcing fabric layer with the surface covered with vulcanized fabric layer of the substrate with the formation of the Assembly reinforced compressible printed cloth.13. The method according to p. 12, characterized in that the applied elastomeric working surface on the upper surface of the reinforcing fabric layer.14. The method according to p. 12, wherein connecting the second fabric layer of the substrate with a surface of the first the tissue layer between the Assembly compressible layer and the working surface to protect the compressible layer from stress, taking place on the printed surface.16. The method according to p. 12, wherein the applied adhesive layer between each adjacent layer of fabric before curing Assembly blades for the formation of ties between adjacent layers.17. The method according to p. 12, characterized in that the containing microspheres matrix put spread on a layer fabric base with a receiving thereon a coating thickness of 0.004 - 0.30 inches.18. The method according to p. 12, characterized in that the use of microspheres of high-melting thermoplastic selected from the group consisting of copolymers of Acrylonitrile, Methacrylonitrile and methyl methacrylate.19. The method according to p. 12, characterized in that at the stage of vulcanization carry out at least one stage of pre-heating or temperature control, which is carried out at a lower temperature than the temperature of vulcanization.20. The method according to p. 12, characterized in that utverjdayut Assembly canvases at 132 - 160oWith over a period of time from 30 min to 16 h at a pressure in the range from atmospheric up to 6 kg/cm2with the formation of the laminated printed cloth.21. The method according to p. 12, characterized in that additionally use a paper film having a relative is dcoi treatment of the working surface when laminating cloth.22. The method according to p. 12, characterized in that the polished working surface of the laminated printed canvas to give it the desired surface profile.23. The method according to any of paragraphs.1 and 12, characterized in that vulcanizer covered with a fabric layer basics at 125 - 135oC for a time period of 3.5 - 4.5 hours24. The method according to any of paragraphs.1 and 12, characterized in that it further vulcanizer covered with a fabric layer basis in a number of successive stages, and these stages include:
a) heating the coated fabric layer basics for 15 min at a temperature of from room temperature up to 93oC.b) heating the fabric layer is the basis for 93 - 127oC for additional 15 min;
C) heating the fabric layer basis for an additional 15 minutes at 127 - 135oC.g) additional heating of the tissue layer framework for 3.5 h at 135oC.25. The method according to p. 12, characterized in that utverjdayut Assembly canvases at 143 - 149oC.26. Compressible layer containing an elastomeric matrix having essentially equal thickness and cellular structure around the layer that includes many closed cells, forming pores, and the pores are essentially the OC, that microspheres made of high-melting thermoplastic.27. Layer under item 26, characterized in that the microspheres are made of high-melting thermoplastic selected from the group consisting of copolymers of Acrylonitrile, Methacrylonitrile and methyl methacrylate.28. Layer under item 26, characterized in that vysokopilskyi thermoplastic microspheres have a diameter of 1 to 200 microns.29. Layer under item 26, characterized in that the microspheres are made of high-melting thermoplastic selected from the group consisting of vinylidenechloride of homopolymers and copolymers, fluoropolymers, polyaryletherketones, nitrile resins, polyamidimide, polyarylates, polybenzimidazoles, polycarbonates, thermoplastic polyesters, polyetherimides, polyamides, polymethylpentene, modified polyphenyleneoxides, polyster, polypropylene, chlorinated polyvinyl chloride and mixtures thereof.30. Layer under item 26, characterized in that the microspheres optionally contain a surface coating to facilitate connection to the matrix.31. Layer under item 30, wherein the surface coating is formed from a material selected from the group consisting of talc, calcium carbonate, zinc oxide, Dookie.32. Compressible printed sheet containing layer fabric base, elastomero the print surface forming the outer working surface of the canvas, and the compressible layer containing an elastomeric matrix having essentially equal thickness and cellular structure around the layer that includes many closed cells, forming pores, and the pores are essentially evenly distributed over the compressible layer and formed from a variety of thermoplastic microspheres, while the compressible layer is located between the fabric layer of the substrate and the elastomeric printing surface, and layer fabric base, a compressible elastomeric layer and the print surface is laminated together with the formation of the fabric, characterized in that that microspheres made of high-melting thermoplastic.33. The painting by p. 32, characterized in that it contains at least a second tissue layer of the base, facing the first layer tissue layer of the substrate and located below it.34. The painting by p. 33, characterized in that it contains a reinforcing fabric layer located between the compressible layer and the working surface.35. The painting by p. 34, characterized in that it contains at least two reinforcing fabric layer, u is
FIELD: tire industry.
SUBSTANCE: the invention is pertaining to the field of tire industry and may be used for making tires. The sectional toroidal support contains a set of sections precisely centered on a circumference around a geometrical basic axis and forming an exterior surface essentially reproducing an internal conformation of the treated tire. The sectional support contains a flange, on which there is at least one fastening element for engagement with a manipulating device and a counter flange operatively coupled to the flange in an axially opposite position. The sectional support contains the hutching devices for motionless retention of the sections between the flange and the counter flange. Each of the sections has a main body with essentially a U-shaped contour in its cross section, which is limited on one side by the external side forming an external surface and by the internal side facing the geometrical basic axis. The devices of hitching contain for each of the sections at least one fastening plate radially protruding from the internal side practically in a plain perpendicular to the indicated geometrical basic axis and a made with a capability of a removable hitching in an axial position between the flange and the counter flange. The invention is aimed at development of the new production method, that allows to produce separate elements of a tire and then to form them in correspondence with a specific sequence directly on the tire.
EFFECT: the invention presents a development of the new production method, that allows to produce separate elements of a tire with their formation according to a specific sequence directly on the tire.
11 cl, 11 dwg
FIELD: tires production industry.
SUBSTANCE: the invention is pertaining to the tires production industry and may be used at in production of pneumatic tires. The method of removal of a being disassembled toroidal support includes stages of placement of the toroidal support carrying a vulcanized tire on the dismantling workstation. The toroidal support contains allot of sectors located along a circumference around of a geometrical supporting axis and attached to each other with the help of a flange and a counter flange being in a mutual interconnection on opposite to the axis direction concerning the sectors. The method provides for disconnection of the flange from the counter flange, displacement along direction of the axis of the flange and the counter flange at a space from the sectors and removal of each sector from the tire by a centripetal radial translational motion. At that at least to one of the sectors simultaneously with a centripetal radial translational motion impart an angular rotary relocation, which takes place around a pivot axis, that is essentially perpendicular to the direction being radial to the geometrical bearing axis and placed in a meridian plane shifted in a direction of the axis concerning an equatorial plane of the tire. The method ensures extraction of the sectors of the toroidal support from the vulcanized tire directly after removal of the tire from the installation without its deformation and elimination of the high strains formed in the space between sides of the tire.
EFFECT: the invention ensures extraction of the sectors of the toroidal support from the vulcanized tires directly after their removal from the installation and without deformation and a need to eliminate the high tensions formed in the space between the sides of the tires.
10 cl, 11 dwg
FIELD: tire industry; laying tread on casing of vulcanized pneumatic tire, both reused and new ones.
SUBSTANCE: proposed method includes placing the tread on pneumatic tire casing for molding the tread. Then, casing of pneumatic tire is mounted on rim and is inflated and circular elastic vulcanizing mold is placed on tread. Mold has inner circular surface for molding the tire tread. Then, two elastic flanges made in form of flexible members are placed between each bead and each peripheral edge of vulcanizing mold. Flanges cover outer surface of pneumatic tire formed by casing covered with tire tread and located between bead and edge of vulcanizing mold. System thus molded is placed in heating chamber where excessive pressure is maintained. Provision is made for device used for realization of this method.
EFFECT: simplified procedure, ease of laying tire on casing; enhanced reliability of vulcanizing mold subjected to high elastic action at vulcanization of tires.
22 cl, 6 dwg
FIELD: production of hollow rubber articles, diaphragms for example.
SUBSTANCE: proposed mold has external bead on neck and upper, middle and lower molding plates and solid core with air valve. All plates and core are provided with heaters. Lower plate has molding section on inner surface of article. Middle plate is solid in construction; it is used as limiter for relief of diaphragm with compressed air and may be extended together with core and article mold for relief beyond it. Upper plate has pouring gate. Mold has at least one lock for holding the plates in closed position. Provision is made for use of middle solid plate as limiter against excessive bulging of article during its removal, thus keeping article intact during removal.
EFFECT: improved quality of articles; facilitated procedure of removing articles from core.
FIELD: rubber industry; methods of production of covers for the pneumatic tires.
SUBSTANCE: the invention is pertaining to the field of rubber industry, in particular, to the method of production of the covers of the pneumatic tires and may be used at vulcanization of the covers gathered on the hard toroidal-shaped mandrel. The method of vulcanization of the covers for the pneumatic tires provides, that the covers for the pneumatic tires are assembled on a metallic toroidal-shaped mandrel, then the uncured cover together with the mandrel is positioned in the press-vulcanizer of diaphragm type. The resilient diaphragm of the press-vulcanizer is introduced into the internal cavity of the mandrel and feed the heating medium into the resilient diaphragm. The resilient diaphragm put under pressure begin to stretch and tightly fits to the whole inner surface of the mandrel so realizing the thermal contact of the resilient diaphragm to the mandrel and transfer of the heat from the resilient diaphragm to the cover located on the metallic mandrel ensuring the uniform distribution of the heating medium along the whole volume of the cover. The method ensures the uniform distribution of the heat along the whole volume of the cured cover, and so excludes the necessity to realize the process of the preliminary vulcanization of the sealing layer, and simplifies realization of the whole process of the "raw cover" assembly.
EFFECT: the invention ensures the uniform distribution of the heat along the whole volume of the cured cover so excluding the necessity to realize the process of the preliminary vulcanization of the sealing layer, and simplifies realization of the whole process of the "raw cover" assembly.
FIELD: rubber industry.
SUBSTANCE: invention relates to manufacture of rubber articl3s by pressure die casting, particularly, rubber linings of stator of screw gerotor hydraulic machines, namely, downhole screw motors for drilling oil and gas wells and screw pumps for transfer of liquids. Press-mould for manufacture of rubber lining of stator of screw gerotor hydraulic machine contains core with multistart screw teeth, filler head with inlet channel connected with cast channel coming to forming end face between teeth of core connected with core by threaded joint, and two bushings. One of bushings is installed on filler head, and the other, on side of core opposite to filler head. Hollow housing of stator under manufacture installed on bushing concentrically to core forms molding space together with press-mould. Proposed press-mould improves reliability and service life and accuracy and quality of manufacture of rubber lining of stator of screw gerotor hydraulic machine. This is provided owing to fitting a lock in press-mould. Lock is arranged inside core filler head and is connected by devices to take up torque between lock and core and between lock and filler head. Devices to take up torque between lock and core and between lock and filler head are made, respectively, in form of rollers installed in longitudinal slots of lock and core and in form of pin arranged between cast channels of filler head.
EFFECT: improved reliability and increased service life of press-mould.
2 cl, 3 dwg
FIELD: the invention refers to the field of manufacturing hollow resin retort-shaped diaphragms with an external collar on the orifice for keeping the diaphragm on the place of putting with the aid of a clamp.
SUBSTANCE: the press mold has the upper, middle and the lower forming plates and a whole core with an air valve. The plates and the core are provided with heaters. The lower plate has a styling site on the inner surface of the article. A forcing chamber with funnels is fulfilled in the upper plate. The middle plate is fulfilled whole and fulfilled so that it serves as an arrester at unloading out of the limits of the press. The press mold has not a removable lock. Keeping the plates in closed position during forming and vulcanization of the article is ensured due to the efforts of the press and the choice of correlation of the square of projection of the forcing chamber and the square of projection of the article on the plane of the cutoff of the form so that opening of the form along the plane of the cutoff and discharge of the surplus of resin take place after complete forming of the article.
EFFECT: increases reliability of the work of the press mold with ensuring quality of ready-made article.