WO2021213431A1 - Ink transfer medium and preparation method therefor - Google Patents

Abstract

Disclosed in the present application is an ink transfer medium. The ink transfer medium at least comprises: a first substrate layer; an air cushion layer located on the first substrate layer; a second substrate layer located on the air cushion layer; and a surface adhesive layer located on the second substrate layer, wherein the penetration thickness of the air cushion layer on the first substrate layer is less than or equal to the thickness on the first substrate layer; the interlayer adhesive force between the first substrate layer and the second substrate layer is greater than or equal to 1.5 KN/m; and the residual amount of an organic solvent of the ink transfer medium is less than or equal to 0.1 PPM.

Description

Ink transfer medium and preparation method thereof Technical field

This application belongs to the field of printing technology, and specifically relates to an ink transfer medium and a preparation method thereof.

Background technique

In the field of offset printing, ink transfer media can be used to wrap around the transfer cylinder, so that the ink on the printing plate can be transferred to the surface of the substrate. With the development of the printing industry, the performance requirements of the ink transfer media are also Higher and higher.

The ink transfer medium usually has a multi-layer structure. When preparing the ink transfer medium, a coating process is used between the layers. However, the coating process requires the use of organic solvents (such as benzene, benzyl, xylene, etc.), which not only makes The inter-impregnation between multiple layers causes the ink transfer medium to be unsuitable, and organic solvents are harmful to health and cause great environmental pollution. Therefore, it is very important to provide a new ink transfer medium.

Application content

In view of the above problems, the purpose of the present application is to provide an ink transfer medium and a preparation method thereof. The ink transfer medium is prepared by a calendering process, which can well solve the problems of unenvironmental protection and unsatisfactory use performance in the prior art. The ink transfer medium has good stability, high strength and good resilience, and the printing speed can reach high-speed printing of 15,000 impressions.

The present application provides an ink transfer medium. The ink transfer medium includes at least a first substrate layer;

The air cushion layer is located on the first base material layer; the second base material layer is located on the air cushion layer; the surface adhesive layer is located on the second base material layer; wherein, the air cushion layer is located on the second base material layer. The penetration thickness on a substrate layer is less than or equal to the thickness on the first substrate layer, and the interlayer adhesion between the first substrate layer and the second substrate layer is greater than or equal to 1.5KN/m , The residual amount of the organic solvent of the ink transfer medium is less than or equal to 0.1 PPM.

In one embodiment, under a printing load of 800-1500Kpa, the compressibility of the ink transfer medium is 0.12-0.24mm, and under a printing load of 1800-2500Kpa, the compressibility of the ink transfer medium 10 is 0.20- 0.32mm.

In one embodiment, the first substrate layer includes a first cloth layer; a first adhesive layer located on the first cloth layer; and a second cloth layer located on the first adhesive layer; Wherein, the radial elongation of the first cloth layer is less than or equal to 4.5%, and/or the radial strength is greater than or equal to 1900 KN/m.

In an embodiment, the thickness of the first cloth layer is greater than or equal to the thickness of the second cloth layer, and the thickness of the first cloth layer is 0.37-0.41 mm.

In one embodiment, the ratio of the thickness of the first substrate layer and the second substrate layer in the ink transfer medium is 45-50%.

In one embodiment, the air cushion layer has a fully closed micropore structure formed by a microsphere capsule foamed vulcanized rubber component, and the fully closed micropores have a pore diameter of 1-100 μm.

In one embodiment, the microsphere capsule is a polyurethane microsphere with a diameter of 0.01-1.5 μm.

In one embodiment, the air cushion layer includes a cross-linked structure, the cross-linked structure includes epoxy resin, acrylic acid, isocyanate, rubber, and a support aid, and the compressibility of the air cushion layer is 0.10～0.18 mm , The tensile strength of the air cushion layer is greater than or equal to 82 N/mm, and the adhesion between the cloth layers on the upper and lower surfaces of the air cushion layer is 1.2-1.8 KN/m.

In an embodiment, the supporting aid includes one or more combinations of nano-scale white carbon black, stearic acid, zinc chloride, light calcium carbonate, and plasticizer TP-90B.

In one embodiment, the surface adhesive layer includes nanostructures, the nanostructures include rubber and nanomaterials, and the Shore A hardness of the nanostructures is 70°-85°; the nanomaterials include graphite One or more combinations of alkenes, carbon nanotubes, and nanosilica.

In one embodiment, the surface roughness Ra of the first surface of the surface adhesive layer is 0.8 to 1.4 microns, and the interlayer adhesion force on the second surface of the surface adhesive layer is 1.2 to 1.8 KN/m.

In one embodiment, the surface adhesive layer includes the following components: 50-200 parts by mass of the first nitrile rubber, 0-100 parts by mass of the second nitrile rubber, 2-20 parts by mass of nanomaterials, 2 ~20 parts by mass of zinc chloride, 0.5~5 parts by mass of stearic acid, 7~35 parts by mass of plasticizer TP~90B, and 0~15 parts by mass of light calcium carbonate.

In one embodiment, under the condition that the ink contact time is 20-24 hours and the contact temperature is 35±2° C., the shrinkage rate of the topcoat layer is 2 to 2.5%.

This application also provides a method for preparing an ink transfer medium, wherein the preparation method at least includes providing a first substrate layer sheet material, an air cushion layer sheet material, a second substrate layer sheet material, and a surface adhesive layer sheet material Press the air cushion layer sheet material on the first substrate layer sheet material; press the second base material layer sheet material on the air cushion layer sheet material, and perform the first stage vulcanization; The second base material layer sheet is pressed against the topping layer sheet material, and the second stage vulcanization is carried out to obtain an ink transfer including a first base material layer, an air cushion layer, a second base material layer, and a topping layer Medium; wherein the penetration thickness of the air cushion layer on the first substrate layer is less than or equal to the thickness on the first substrate layer, between the first substrate layer and the second substrate layer The interlayer adhesion force of the ink transfer medium is greater than or equal to 1.5KN/m, and the residual amount of the organic solvent of the ink transfer medium is less than or equal to 0.1PPM.

In one embodiment, the pressing process includes pressing in a calendering equipment, wherein the calendering parameters include: a temperature of 100-170°C; a pressure of 5-12 MPa; a distance between rollers of 0.05-5 mm; and a calendering rate of 5-15m/h.

In one embodiment, the first-stage vulcanization is staged vulcanization through multiple heating temperatures, and the multiple heating temperatures include a first vulcanization temperature, the first vulcanization temperature being 85-100°C, and a second vulcanization temperature , The second vulcanization temperature is 100-130°C; the third vulcanization temperature, the third vulcanization temperature is 130-160°C.

In an embodiment, the vulcanization parameter of the second stage vulcanization is selected from at least one of the following items, the temperature is 140° C.-160° C.; the pressure is 3-8 kg; and the time is 8-24 h.

In one embodiment, the second-stage vulcanization is completed by a second vulcanization device, and the first vulcanization device includes a conveying component that conveys the ink transfer medium to be vulcanized in the second stage; After the assembly, the ink transfer medium to be vulcanized in the second stage is tensioned; the vulcanization assembly is arranged after the tensioning assembly to heat and vulcanize to obtain the ink transfer medium after the second stage vulcanization; the receiving assembly is arranged at After the vulcanization component, to receive the ink transfer medium after the second stage vulcanization.

In one embodiment, the method for preparing the top rubber layer sheet material includes mixing rubber and nanomaterials to form a nanostructure to obtain a mixed rubber; calendering the mixed rubber to obtain a sheet. Said rubber layer sheet; wherein, the mixing process of the compounded rubber includes drawing the rubber into a thin sheet to obtain a plastic rubber; mixing the plastic rubber with the nanomaterial, and performing the first stage mixing to obtain the first A compounded rubber; mixing the first compounded rubber with powder, and performing a second stage of mixing to obtain a second compounded rubber; wherein the Mooney value of the first compounded rubber is 48-55, The Mooney value of the second mixed rubber is 40-48, and the powder is selected from one or more combinations of sulfur, stearic acid, zinc chloride, antioxidants, coloring agents and accelerators.

In one embodiment, in the first stage mixing, the temperature is 70-80°C and the pressure is 4-5 MPa; in the second stage mixing, the temperature is 50-60°C and the pressure is 2～ 3MPa.

This application provides an ink transfer medium and a preparation method thereof. The multi-layer structure of the ink transfer medium is formed by a calendering process, and the penetration thickness of the air cushion layer in the ink transfer medium on the first substrate layer is less than or equal to the thickness on the first substrate layer , The interlayer adhesion force between the first substrate layer and the second substrate layer is greater than or equal to 1.5KN/m, and the residual amount of the organic solvent of the ink transfer medium is less than or equal to 0.1PPM, which avoids coating The process causes impregnation problems, improves the qualification rate of products, avoids resource waste and environmental pollution problems, and also improves the working environment. In addition, the ink transfer medium provided according to the present application has good stability, high strength, and good resilience, and the printing speed can reach high-speed printing of 15,000 impressions.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present application more clearly, the following will briefly introduce the drawings used in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative work, other related drawings can be obtained based on these drawings.

Figure 1 shows a schematic diagram of the ink transfer medium of the present application when in use.

Fig. 2 shows a schematic structural diagram of a specific embodiment of the ink transfer medium of the present application.

Fig. 3 shows a schematic structural diagram of another specific embodiment of the ink transfer medium of the present application.

Figure 4 shows a schematic diagram of the cell structure of the air cushion layer in the ink transfer medium of the present application.

FIG. 5 shows an optical microscope image of the air cushion layer in the ink transfer medium of the present application at a magnification of 100 times.

Fig. 6 shows an optical microscope image of the boxed part in Fig. 5 at 1000 times magnification.

Figure 7 shows the roughness of the top layer in the ink transfer medium of this application.

Fig. 8 shows a direct view of the appearance of the top rubber layer in the ink transfer medium of the present application.

FIG. 9 shows a schematic flow chart of a specific embodiment of the ink transfer medium preparation method of this application.

Fig. 10 shows an exemplary block diagram of the ink transfer medium manufacturing equipment of the present application.

Fig. 11 shows a schematic diagram of the structure of the calendering equipment in Fig. 10.

Fig. 12 shows a schematic diagram of the structure of the first vulcanizing equipment in Fig. 10.

Fig. 13 is a schematic diagram showing the structure of the second vulcanizing equipment in Fig. 10.

Detailed ways

In order to make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings herein can be configured and designed according to various needs.

As shown in Figure 1, the present application provides an ink transfer medium 10, which can be coated on the transfer cylinder 101 of the offset printing press 100, so as to be used as a type of offset printing (offset printing) process. A medium for ink transfer, where the ink is directly transferred from the surface of the ink transfer medium 10 to the substrate 30. Specifically, it can be achieved by the following process. The transfer cylinder 101 coated with the ink transfer medium 10 is rotated, and brought into close contact with the printing plate cylinder 102 on which characters and images are formed and provided with printing ink, so that it is located in the printing plate. The character and image inks on the printing plate 20 at the plate cylinder 102 are transferred to the ink transfer medium 10, and then the characters and images on the ink transfer medium 10 (transfer and merge) are positioned on the impression roller 103 The printed substrate 30 is like paper, and the paper is transported in close contact with the ink transfer medium 10 for printing.

As shown in FIG. 2, the ink transfer medium 10 provided by the present application includes a first substrate layer 11, an air cushion layer 12, a second substrate layer 13 and a top coat layer 14. The ink transfer medium 10 shown forms a multilayer structure laminate, the first substrate layer 11 is the innermost layer, covering the transfer roller 101 of the printing machine 100, and the surface adhesive layer 14 is the outermost layer. In the outer layer, the ink on the printing plate 20 of the printing plate cylinder 102 adheres to the top layer 14 of the ink transfer medium 10 to be transferred.

The thickness of the ink transfer medium 10 is, for example, 1.8-2.5 mm, and further, for example, 1.95 mm, 2.00 mm, or 2.05 mm. Based on this, the ink transfer medium 10 has ideal strength and is not easily deformed. Further, the thickness variation of the ink transfer medium 10 is, for example, less than or equal to 0.03 mm, such as 0.01 mm or 0.02 mm.

The ink transfer medium 10 has, for example, a Shore A hardness of 70° to 85°, such as 76°, 78°, 81°; a tensile strength greater than or equal to 80 KN/m, and further, greater than or equal to 90 KN/m, For example, 95KN/m, 100KN/m, 105KN/m; have an elongation less than or equal to 2.0%, and further, less than or equal to 1.6%, such as 1.4%, 1.0%, 0.9%; and have a compressibility of 0.10～0.18mm , Such as 0.20mm, 0.66mm, 0.1mm, more specifically, in some embodiments, under a printing load of 800-1500Kpa, such as 1060Kpa, the compressibility of the ink transfer medium 10 is, for example, 0.12-0.24mm, For example, 0.14 mm, under a printing load of 1800-2500 Kpa, such as 2060 Kpa, the compressibility of the ink transfer medium 10 is, for example, 0.20-0.32 mm, such as 0.21 mm. The interlayer adhesion force between the layers of the ink transfer medium 10 is greater than or equal to 1.5 KN/m, and further greater than or equal to 1.8 KN/m, and the surface roughness Ra of the ink transfer medium 10 is 0.8 to 1.4 μm, for example, 0.9 μm, 1.0 μm, 1.3 μm.

The residual amount of organic solvent in the ink transfer medium 10 refers to the residual amount of organic solvent in each layer of the first substrate layer 11, the air cushion layer 12, the second substrate layer 13, and the surface adhesive layer 14 forming the ink transfer medium 10 The sum is less than or equal to 0.1 PPM, further, less than or equal to 0.05 PPM, and furthermore, the residual amount of organic solvent is 0, and these solvents can be selected from ketone solvents, aromatic solvents, ester solvents, etc., for example. Specifically, in some embodiments, it may be that the first substrate layer 11, the air cushion layer 12, the second substrate layer 13 and the surface adhesive layer 14 are avoided or to a great extent in the process of manufacturing the ink transfer medium 10 To achieve this by reducing the use of organic solvents.

Please refer to FIG. 2 next. In some embodiments, the first substrate layer 11 includes a first cloth layer 111, a first adhesive layer 112, and a second cloth layer 113. The first cloth layer 111 and the The second cloth layer 113 may, for example, adopt the same or different structure, such as long-staple cotton cloth, linen cloth, non-woven cloth, etc. The first base material layer 111 is composed of the first cloth layer 111 and the second cloth layer 113 It is the support skeleton of the ink transfer medium 10, based on the viewpoint of ensuring that the ink transfer medium 10 has sufficient radial tensile strength and the smallest possible elongation to obtain good applicability. For example, long-staple cotton cloth, Linen cloth, non-woven cloth, etc., such as long-staple cotton cloth. Further, the first cloth layer 111 and/or the second cloth layer 113 has a thickness of 0.3-0.5mm, such as 0.35mm, 0.37mm, 0.39mm , 0.41mm, with a cloth seam of 0.03mm～0.8mm (ie the gap between the warp yarn and the weft yarn), such as 0.04mm, 0.06mm, 0.069mm, with a weight of 180-250g/m2, for example 200g /m2, 220g/m2, having a radial strength greater than or equal to 1800KN/m, further greater than or equal to 1900, such as 1950, 2000, 2200, and more importantly, the first cloth layer 111 has a diameter less than or equal to 5% The longitudinal elongation is further less than or equal to 4.5%, such as 4.5%, 4%, and has a constant load elongation less than or equal to 1.6%, and further less than or equal to 1.5%, such as 1.4%, 1.3%. The first cloth material within the above range does not stretch, break, or deform, and has good affinity with the air cushion layer 12 and the surface adhesive layer 14, and is easy to bond and not fall off. Therefore, based on this The first substrate layer 11 can make the ink transfer medium 10 bear a radial force of more than 500 kg, and further, bear a radial force of 1000 kg without deformation, and has good compressibility and flexibility.

Please refer to FIG. 3 next. The first adhesive layer 112 is located between the first cloth layer 111 and the second cloth layer 113, and is used to bond them without bleeding. Based on the first adhesive layer 112 Adhesion, the interlayer adhesion between the first cloth layer 111 and the second cloth layer 113 should have an adhesion force greater than or equal to 1.5 KN/m, and further greater than or equal to 1.8 KN/m, so that the ink transfer medium 10 Avoid breaking due to radial force during use. The first adhesive layer 112 can be, for example, an anaerobic adhesive, such as butyl acrylate and a C2-C10 alkyl ester of acrylic acid; epoxy resin, such as a one-component resin adhesive, such as dicyanide Amine (cyanoguanidine), or a two-component system using polyfunctional amine or polyfunctional acid as a curing agent, or cyanoacrylate; or hot melt adhesives such as polyethylene, polyvinyl acetate, polyamide, Hydrocarbon resins, resin-like materials, and waxes may also be pressure-sensitive adhesives. The thickness of the first adhesive layer 112 is, for example, 0.1 mm-1 mm, such as 0.13 mm, 0.2 mm, 0.3 mm, 0.5 mm, 0.7 mm.

4, in other embodiments, the first substrate layer 11 may include a first cloth layer 111, a first adhesive layer 112, a second cloth layer 113, a second adhesive layer 114, and a third The cloth layer 115 thus constitutes more layers of the ink transfer medium 10 by increasing the number of layers of the first base layer 11. The second adhesive layer 114 may have the same structure or a different structure from the first adhesive layer 112, for example. The third cloth layer 115 may have the same structure or a different structure from the first cloth layer 111 and/or the second cloth layer 113, for example. At this time, in the first base material layer 11 within the above-mentioned structure range, the thickness between the first cloth layer 111, the second cloth layer 113, and the third cloth layer 115 may be, for example, D111 greater than or equal to D113 greater than or equal to The relationship of D115, for example, the thickness can be 0.37mm, 0.37mm, 0.37mm; 0.39mm, 0.37mm, 0.37mm; 0.37mm, 0.37mm, 0.35mm; 0.39mm, 0.37mm, 0.35mm, etc., respectively. The tensile strength of the first cloth layer 111, the second cloth layer 113 and the third cloth layer 115 should be above 50kgf/cm, and the elongation at break should be below 7.5% to avoid pressure on the ink transfer medium 10 during the printing process Rupture occurs, and good flexibility is ensured.

2 and 3, the thickness of the first substrate layer 11 is, for example, 0.6 to 1.4 mm, such as 0.84 mm, 0.94 mm, 1.21 mm, and 1.33 mm. The first substrate layer 11 within this range can fully ensure that the ink transfer medium 10 has the expected performance.

2 and 4 to 6, the air cushion layer 12 is located on the first substrate layer 11, the air cushion layer 12 has a microporous structure, and is further composed of microsphere capsules, specifically, The raw material components of the air cushion layer 12, for example, include the microspheres, rubber components, and additives, etc., at a certain temperature, and further vulcanized in multiple temperature ranges to form a foamed microporous structure. The micropores are fully closed micropores with a diameter of, for example, 0.005-0.03mm, such as 0.01mm, 0.013mm. The pores are uniform and complete, with an average porosity of 70-80%, and a compressibility of 0.10～0.18mm, such as 0.20 mm, 0.66mm, 0.1mm, to ensure that during the printing process, the micropore absorbs the printing pressure and does not cause bulges on the surface of the ink transfer medium 10, causing dot deformation, and when the printing pressure is eliminated, the micropores quickly recover. In order to keep the pressure basically constant during the printing process, the air cushion layer 12 can be applied to the calendering process. The foamed pores have high strength, uniform pores, small deformation after pressure, and strong compressibility. In addition, the air cushion layer 12 is located between the substrates 11 and 13, which can achieve a balance between adhesion and slurry penetration. The residual amount of organic solvent in the air cushion layer is less than or equal to 0.1 PPM. The product has a high pass rate and is stable in use. Good, high strength, good resilience, and the printing speed can reach high-speed printing of 15,000 impressions.

In some embodiments, the microspheres may be a foaming agent for polyurethane microspheres. The polyurethane microspheres are composed of a polyurethane shell and the gas enclosed by it, and the tiny spherical plastic particles are formed. When heated, the polyurethane microspheres The shell is softened and the gas in the shell expands, which increases the volume of the foamed microspheres, and is a 100% closed body, and returns to its original volume after the pressure is released. The foaming temperature of the polyurethane microsphere foaming agent is, for example, 80-190°C, and the diameter is, for example, 0.01-1.5 μm, and further is 0.7-1.4 μm, such as 0.8 μm, 1 μm. Of course, it is not limited to this, the microspheres can also be formed of acrylonitrile or copolymers of acrylonitrile, and the raw material components of the microspheres further include isobutane, 2,4-dimethyl Butane, 2-methylpentane, 3-methylpentane, n-hexane, cyclohexane, heptane, isooctane or any combination thereof, the microspheres may also be other suitable polymer microspheres The spheres, for example, can be prepared by emulsion polymerization. After emulsification, polymer particles are obtained, which are then sieved and dried to obtain the microspheres. The average particle size of the polymer particles may be 0.02-0.05 mm, for example, 0.02 -0.05mm. Through sieving, sample microspheres with similar average particle size can be obtained, which can limit the influence of uneven particle size on swellability in the use of offset plates.

In some embodiments, the rubber component may be, for example, acrylonitrile/butadiene rubber (NBR), chloroprene rubber (CR), fluorine rubber (FKM), polyurethane rubber (UR), ethylene propylene rubber (EPDM). ), butyl rubber (IIR), etc.

In some embodiments, the auxiliary agent includes, for example, a vulcanizing agent, an anti-aging agent, a reinforcing agent, a filler, a plasticizer, and the like. The filler is, for example, carbon black, white carbon black, silica, titanium dioxide, calcium carbonate, coloring pigment, clay, and a combination thereof, and the reinforcing agent is, for example, zinc stearate and/or zinc oxide.

In one embodiment, the present application provides an air cushion layer 12 in an ink transfer medium. The air cushion layer 12 of the present application includes a cross-linked structure, and the cross-linked structure includes epoxy resin, acrylic acid, isocyanate, and rubber. And supporting aids, epoxy resin, acrylic acid, and isocyanate to form the microspheres, the compressibility of the microspheres is 0.10～0.18mm, the tensile strength of the air cushion layer is ≥82N/mm, and rubber is added to the microspheres After vulcanization treatment with supporting aids, the cross-linked structure is generated, so that the microspheres can expand better, so that the compression performance and tensile strength of the air cushion layer can be improved. The process of making glue, coating process, and using steam heating to volatilize toluene and other solvents saves the raw material cost and energy consumption of blanket production. It is a new energy-saving and environmentally-friendly process. The compressibility of the microspheres is, for example, 0.10˜0.18 mm, and the tensile strength of the air cushion layer is, for example, ≥82 N/mm. More specifically, the support aid includes one or more combinations of nano-scale white carbon black, stearic acid, zinc chloride, light calcium carbonate, and plasticizer TP-90B. The rubber is, for example, nitrile rubber. The adhesion between the cloth layers on the upper and lower surfaces of the air cushion layer 12 is, for example, 1.2-1.8 KN/m. The microsphere is a hollow microsphere, and the inside of the hollow microsphere is wrapped with gas. Under heating conditions, closed micropores with a pore diameter of 0.008 to 0.01 mm are formed inside the microsphere. The thickness of the air cushion layer is, for example, 0.3 to 0.6 mm. The epoxy value of the epoxy resin is 3-6. The isocyanate is, for example, an aromatic diisocyanate.

In one embodiment, the air cushion layer 12 includes, for example, the following components: 10-30 parts by mass of microspheres, 0-200 parts by mass of nitrile rubber, 3-10 parts by mass of nano-scale silica, or for example Including 10-30 parts by mass of microspheres, 5-20 parts by mass of nitrile rubber, 1-2 parts by mass of nano-scale white carbon black, 2-3 parts by mass of stearic acid, 2-6 parts by mass of chlorinated Zinc, 3-5 parts by mass of light calcium carbonate, and 2-9 parts by mass of plasticizer TP-90B. Among them, for example, two different nitrile rubbers are added, or only one nitrile rubber is added, for example, 50-200 parts by mass of the first nitrile rubber and/or 0-100 parts by mass of the second nitrile rubber are added. Among them, 10-30 parts by mass of microspheres are mainly obtained by mixing 10-15 parts by mass of epoxy resin, 10-15 parts by mass of acrylic acid and 10-15 parts by mass of isocyanate, and then undergoing some post-processing steps. The light calcium carbonate in this application can improve the hardness and other properties of the air cushion layer.

Please refer back to FIG. 2, the thickness of the air cushion layer 12 is, for example, 0.2-0.8 mm, further, for example, 0.3-0.6 mm, such as 0.26 mm, 0.35 mm, 0.42 mm, 0.56 mm, 0.78 mm.

Please refer to FIG. 2 next. The second substrate layer 13 is located on the air cushion layer 12. The second substrate layer 13 may include, for example, the same structure as the first substrate 11, which is made of cloth and adhesive. The multi-layer structure formed by the agent, of course, may be only one cloth layer, for example, the cloth layer adopts the same structure as the first cloth layer 111, for example. The thickness ratio of the first substrate layer 11 and the second substrate layer 13 in the ink transfer medium 10 is 45-55%, such as 45-50%, such as 48%, 51%, 52% , Forming the basic framework material of the ink transfer medium 10. The base material layers 11, 13 may be composed of two mixed compositions including long-staple cotton and fine-lint cotton. For example, the base materials 11, 13 may include long-staple cotton: fine-lint cotton according to the mass ratio of (1- 3): 1 mixed compound, such as 1:1, by controlling the quality ratio of fiber cotton, the weight of the base material can be better controlled, energy saving and environmental protection, making it easy to bond, and improving the affinity with rubber.

Please refer to FIGS. 2 and 7 to 8, the surface adhesive layer 14 is located on the second substrate layer 13, and the surface adhesive layer 14 is the outermost layer of the ink transfer medium 10, which directly contacts the ink, and Transfer it to the substrate 103. The surface of the surface adhesive layer 14 is the surface of the ink transfer medium 10. In some embodiments, based on the viewpoint of obtaining the ink transfer medium 10 with properties such as hardness, abrasion resistance, oil corrosion resistance, and chemical corrosion resistance, The surface roughness Ra of the surface adhesive layer 14 is 0.8-1.4um, such as 0.9um, 1.0um, 1.3um, the profile roughness is, for example, Rz is 3-5um, and the variation of unevenness is less than or equal to 0.03mm, and further For example, it is less than or equal to 0.02mm, and the Shore A hardness is, for example, 70°-85°, such as 76°, 78°, 81°, which can achieve clear dots and good abrasive transfer. The interlayer adhesion of the surface adhesive layer 14 is, for example, 1.2-1.8 KN/m, which can avoid the occurrence of delamination between the surface adhesive layer 14 and the surface cloth 13. Under the conditions that the ink contact time is 20-24 hours and the contact temperature is 35±2° C., the melt shrinkage rate of the surface adhesive layer is, for example, 2 to 2.5%. Under the condition that the time of contact with the cleaning agent is 4 to 5 hours and the contact temperature is 23±2° C., the shrinkage rate of the surface adhesive layer is, for example, 2 to 2.5%. The tensile strength of the top rubber layer is, for example, 91-93 N/mm.

In some embodiments, the raw material components of the top rubber layer 14 include the first nitrile rubber and/or the second nitrile rubber, nanomaterials, zinc chloride, stearic acid, plasticizers, antioxidants and / Or anti-aging agent white carbon black and/or light calcium carbonate, the first coloring agent, the second coloring agent, sulfur, the first accelerator, the second accelerator, the anti-scorching agent, the surface adhesive layer 14 can be made of The raw material components are mixed and vulcanized. For example, it includes the following components: 50-200 parts by mass of the first nitrile rubber and/or 0-100 parts by mass of the second nitrile rubber, 2-20 parts by mass of nanomaterials, 2-20 parts by mass of zinc chloride , 0.5-5 mass parts of stearic acid, 7-35 mass parts of plasticizer TP～90B, 0-5 mass parts of antioxidant 2246 and/or 0-5 mass parts of antioxidant 4010 and/or 0～ 15 parts by mass of light calcium carbonate, 0-5 parts by mass of the first colorant, 0-5 parts by mass of the second colorant, 0.5-5 parts by mass of sulfur, 0.5-5 parts by mass of the first accelerator, 0.5-5 parts by mass of the second accelerator, 0.1-1 parts by mass of the anti-scorching agent CTP. In this application, polyester high-temperature plasticizers are used to replace phthalates such as dibutyl ester, so that the printing offset products do not contain phthalate substances, while ensuring the technical performance of the printing offset. The first nitrile rubber and the second nitrile rubber are two different nitrile rubbers. The light calcium carbonate in this application can improve the hardness and other properties of the surface rubber layer.

The rubber and nano-materials constitute a nano-structure, which improves the hardness and wear resistance of the surface rubber layer 14, while increasing the elasticity, overall strength, and fatigue resistance, so as to meet the requirements of high-speed printing. In some embodiments, the nanomaterial includes one or more combinations of graphene, carbon nanotubes, and nanosilica. For example, it is a combination of graphene and nano-silica, such as a combination of carbon nanotubes and nano-silica, for example, including a combination of graphene, carbon nanotubes and nano-silica. In this application, nano-silica is an amorphous white powder, non-toxic, odorless, and non-polluting. Its microstructure is spherical, showing a flocculent and net-like quasi-particle structure. Graphene has good resistance to ink penetration, and can enhance resistance to ink erosion and chemical corrosion. Carbon nanotubes have a special structure. The radial dimension is on the order of nanometers and the axial dimension is on the order of micrometers. Both ends of the tube are basically sealed. Carbon nanotubes are mainly composed of carbon atoms arranged in a hexagonal shape to form coaxial circular tubes with several to tens of layers, and a fixed distance between the layers is maintained, about 0.34nm, and the diameter is generally 2-20nm. When the nano material is a combination of graphene and nano silica, the network structure of nano silica and the honeycomb structure of graphene cooperate with each other to further enhance the hardness and wear resistance of the surface rubber layer 14. When the nano-material is a combination of carbon nanotubes and nano-silica, the nano-silica will be adsorbed on the wall of the carbon nanotubes, which will further enhance the hardness and wear resistance of the system, thereby making the surface adhesive layer 14 Has a good ink transfer effect.

Please refer to FIG. 5, the thickness of the surface adhesive layer 14 is, for example, 0.15 to 0.5 mm, such as 0.15 mm, 0.23 mm, 0.33 mm, 0.45 mm, and the surface adhesive layer 14 provided by the present application is formed on the second When the base material layer 13 is used, the top rubber layer 14 and the second base material 13 will not penetrate each other, that is, the surface roughness Ra of the top rubber layer 14 is 0.8-1.4 nm, and the variation of unevenness is less than It is equal to 0.03 mm, which prevents the texture structure of the second substrate 13 from being transferred to the substrate 103, which makes the printing effect unsatisfactory.

Please refer to FIG. 9. This application also provides a method for preparing the ink transfer medium 10 as described above, and the method includes, but is not limited to,

-S1, provide the first substrate layer sheet material, the air cushion layer sheet material, the second substrate layer sheet material, and the surface adhesive layer sheet material;

-S2, pressing the air cushion layer sheet material on the first substrate layer sheet material;

-S3, pressing the second base material layer sheet material on the air cushion layer sheet material, and performing the first stage vulcanization;

-S4, press the topping layer sheet material on the second base material layer sheet material, and perform the second stage vulcanization to obtain a first base material layer 11, an air cushion layer 12, and a second base material layer 13 , And the ink transfer medium 10 of the top glue layer 14.

In the above process, in the ink transfer medium 10, the penetration thickness of the air cushion layer 12 on the first substrate layer 11 is less than or equal to the thickness on the first substrate layer 11, and the first substrate layer 11 The interlayer adhesion force between the base material layer 11 and the second base material layer 13 is greater than or equal to 1.5 KN/m, and the residual amount of the organic solvent of the ink transfer medium 10 is less than or equal to 0.1 PPM.

Referring to FIG. 10, the method for preparing the ink transfer medium 10 can be implemented by, for example, the process of manufacturing equipment C10. Specifically, in some embodiments, the manufacturing equipment C10 includes rubber mixing equipment C100, rubber filtering equipment C200, Calendering equipment C300, patchwork equipment C400, first vulcanization equipment C500, second vulcanization equipment C600, and polishing equipment C700, the ink transfer medium 10 passes through the manufacturing equipment C10 to the ink transfer medium 10 through rubber mixing, rubber filtering, The process of first pressing, first sulphurizing, second pressing, second vulcanizing, and polishing completes the preparation method of the ink transfer medium 10.

Please refer back to FIG. 9. In step S1, the first substrate layer sheet material, the air cushion layer sheet material, the second substrate layer sheet material, and the surface adhesive layer sheet material are provided. More specifically, they may be provided. The raw material components of, furthermore, can refer to the independent sheets formed after their respective raw material components are separately pressed, and then step S2 is performed.

In some embodiments, the first substrate layer sheet material includes a first cloth layer sheet material, a first adhesive layer sheet material, an epoxy resin curing agent, and a second cloth layer sheet material. Specifically, the long-staple cotton cloth is cut and pressed to form a cloth material as the first cloth layer sheet; mixed with epoxy resin curing agent (avoid the use of organic solvents), and pressed to form an adhesive sheet , As the first adhesive layer sheet material; cut the long-staple cotton cloth, and press to form a cloth material as the second cloth layer sheet material, and then sequentially press the first cloth layer sheet material on the first cloth layer sheet material For the adhesive layer sheet material and the second cloth layer sheet material, the pressing process can be realized by calendering, for example, by using a calendering device C300.

In some embodiments, as shown in FIG. 11, the calendering equipment C300 uses, for example, a three-roll calender, which includes a frame C301, a first calender roll C310, a second calender roll C320, and a third calender roll C330. The first calender roll C310 is arranged on one side of the second calender roll C320, and the third calender roll C330 is arranged on the other side of the second calender roll C320. During the calendering operation, according to the rotation direction of the first calender roll C310, the second calender roll C320, and the third calender roll C330, in the ink transfer medium 10, for example, the raw material components of the first adhesive layer 112 are first sent Enter the first calender roll C310 and the second calender roll C320 for the first calendering, and the first adhesive layer sheet that is finally calendered into a sheet is output from the discharge area above the third calender roll C330. The frame C301 is further provided with a spacing adjusting device for adjusting the spacing between adjacent calender rolls, as well as a lifting device and a temperature control device that control the first calender roll C310, the second calender roll C320, and the third calender roll C330, To control the pressing parameters of the calendering equipment C300 during the calendering process, specifically, for example, the temperature is 100-170°C, such as 150°C, 162°C, 165°C; the pressure is 5-12MPa, such as 5.5MPa, 8.5MPa, 10MPa ; The roller spacing is 0.05-5mm, such as 0.06mm, 0.08mm, 1mm, 3mm, 3.5mm; the calendering rate is 5-15m/h, such as 6m/h, 8m/h, 12m/h. In addition, the pressing may be performed more times according to the structure of the first base material layer 11.

Referring to FIGS. 9 and 10, in some embodiments, for example, the raw material components of the air cushion layer 12, such as microspheres, rubber components, and additives, can be passed through, for example, a rubber mixing equipment C100 such as a pressure kneader, etc. The rubber filtering equipment C200 performs mixing and filtering respectively (avoid using organic solvents), for example, then the processed raw material components are compressed, for example, using a calendering equipment C300 to form an air cushion material as the air cushion layer sheet material. Calendering equipment C300 gluing conditions are, for example, roll temperature: upper roll, 70°C, middle roll, 80°C; bottom roll, 60°C, parameters in the pressing process, such as temperature of 100-170°C, such as 150°C, 162°C, 165°C; pressure is 5-12MPa, such as 5.5MPa, 8.5MPa, 10MPa; roller spacing is 0.05-5mm, such as 0.06mm, 0.08mm, 1mm, 3mm, 3.5mm; calendering rate is 5-15m/h, for example It is 6m/h, 8m/h, 12m/h.

In some embodiments, for example, the second substrate layer 13, such as long-staple cotton cloth, can be cut and pressed to form a cloth material to serve as the second substrate layer 13.

9 and 10, in some embodiments, for example, the raw material components of the surface adhesive layer 14, such as the first nitrile rubber and/or the second nitrile rubber, nanomaterials, zinc chloride, and stearin Acid, plasticizer, anti-aging agent and/or anti-aging agent white carbon black and/or light calcium carbonate, first coloring agent, second coloring agent, sulfur, first accelerator, second accelerator, anti-scorching agent pass For example, the rubber mixing equipment C100 such as a pressure kneader, etc., the rubber filter equipment C200 respectively performs mixing and filtering (avoid the use of organic solvents), and then the processed raw material components are compressed using, for example, a calendering equipment C300 to form a sheet of film. , As a surface adhesive layer sheet material.

Specifically, in the rubber mixing process, the rubber is drawn into thin sheets to obtain plastic rubber, and then the plastic rubber and the nanomaterial are uniformly mixed in the rubber mixing equipment C100, for example, in a pressure kneader. At the same time, the first stage of mixing is carried out to obtain the first mixed rubber. The mixing temperature should be controlled at 70～80℃, the pressure should be 4～5MPa, and the mixing time should be controlled at 10～12 minutes. A mixed rubber is mixed with the remaining raw material powder (such as sulfur, stearic acid, zinc chloride, antioxidants, colorants, and accelerators, etc.), and the second stage of mixing is carried out to obtain the second mixed rubber at a temperature of 50~ 60°C, the pressure is 2~3Mpa, in the mixing in this application, the Mooney value of the first compounded rubber is 48-55, and the Mooney value of the second compounded rubber is 40-48. Determine the Mooney standard of a mixed rubber and control it item by item to meet the requirements of calendering process and obtain a higher Mooney value, so as to achieve a win-win result of production process processing and product printing quality up to standard.

Specifically, during the rubber filtering process, the filter screen in the rubber filtering device C200 is set, for example, with 200 mesh to 250 mesh, and the temperature is less than 70° C., and low temperature rubber filtering is performed.

Specifically, in the pressing process, the parameters of the pressing process of the calendering equipment C300 are, for example, the temperature is 100-170°C, such as 150°C, 162°C, 165°C; the pressure is 5-12MPa, such as 5.5MPa, 8.5 MPa, 10MPa; the roller spacing is 0.05-5mm, such as 0.06mm, 0.08mm, 1mm, 3mm, 3.5mm; the calendering rate is 5-15m/h, such as 6m/h, 8m/h, 12m/h.

9 and 10, in step S2, the air-cushion layer sheet material is pressed on the first substrate layer sheet material, specifically, the air-cushion layer sheet material and the first substrate The sheet material is calendered and spliced by, for example, a calendering device C300. At this time, in the finally obtained ink transfer medium 10, the thickness of the air cushion layer 12 that penetrates into the first substrate layer 11 during the lamination process is less than or equal to the thickness of the first substrate layer 11 The thickness of the base layer 11, for example, the first base layer 11 may have a cloth seam of 0.03mm to 0.8mm, and further between 0.05mm to 0.6mm, for example 0.1mm, the air cushion layer 12 passes through the cloth during lamination. The thickness of the air cushion layer 12 infiltrating into the first base material layer 11 can be less than or equal to the thickness of the first base material layer 11. The parameters of the calendering equipment C300 for calendering and splicing are, for example, the temperature is 100-170°C, such as 150°C, 162°C, 165°C; the pressure is 5-12MPa, such as 5.5MPa, 8.5MPa, 10MPa, and the roller spacing is 0.05-5mm. , Such as 0.06mm, 0.08mm, 1mm, 3mm, 3.5mm; the calendering rate is 5-15m/h, such as 6m/h, 8m/h, 12m/h. . Next, proceed to step S3.

Please refer to FIGS. 9 and 10, in the step S3, the second substrate layer sheet is pressed on the air cushion layer sheet material, more specifically, the first substrate layer is laminated on the The other side of the air-cushion layer sheet of the sheet material is calendered to join the second base material layer sheet material. At this time, the second base material layer sheet material may have a cloth seam of 0.02 mm to 0.7 mm, and further It is between 0.03mm and 0.7mm, such as 0.06mm, 0.08mm. The calendering and splicing process can be realized by, for example, calendering using a calendering device C300 and a patchwork device C400. The parameters in the calendering process of the calendering device C300, such as temperature, are 100-170°C, such as 150°C, 162°C, or 165°C. ; The pressure is 5-12MPa, such as 5.5MPa, 8.5MPa, 10MPa; the roller spacing is 0.05-5mm, such as 0.06mm, 0.08mm, 1mm, 3mm, 3.5mm; the calendering rate is 5-15m/h, for example 6m /h, 8m/h, 12m/h. .

Please refer to FIGS. 9-10 and 12, in the step S3, the first stage of vulcanization is performed, and further vulcanization is performed in an environment of 0-0.1kg, such as 0kg, 0.01kg, so that the air cushion layer 12 The normal foaming of the microspheres in the medium ensures the integrity and uniformity of the cells without deformation problems, thereby having ideal compression performance. Furthermore, the first vulcanization equipment C500 is used for grading (ie, at different temperatures) vulcanization. The first vulcanization equipment C500 includes, for example, a frame C510 and an unwinding assembly C520, a hot roller assembly C530, and a winding assembly C540.

12, the unwinding assembly C520 is installed in the frame C510, and can rotate around the frame C510, specifically, the ink transfer medium, such as the first substrate layer The layer structure of the material, the air cushion layer sheet material, and the third substrate layer sheet material is drawn into the hot roller assembly C530.

Please refer to FIG. 9 next. The heat roller assembly C530 is installed in the frame C510 and can rotate around the frame C510. The heat roller assembly C530 includes a plurality of heating rollers, such as 16 heating rollers. The multiple heating rollers have different temperatures, so that the air cushion layer 12 in the ink transfer medium is preheated and vulcanized to ensure that the microspheres are foamed uniformly and tightly, and the bubble diameter is in line with expectations, and further stretched To the winding assembly C140 for winding.

Please refer to 12 next. The winding assembly C540 is located in the frame C510 and can rotate around the frame C510. Specifically, the winding assembly C540 is located behind the heating roller C530. The winding assembly C540 includes a geared motor. The driving wheel C541 on the geared motor is connected to the driven wheel C542 through a transmission belt. The winding driving wheel C544 on the driven wheel C543 is connected to the winding driven wheel C545 on the winding mechanism C540 through the driving belt. The active sprocket C546 on the C542 is connected to the thermal roller assembly C530 through a chain, for example, the passive sprocket and the chain adjusting device on the last two thermal roller assemblies C530 form a chain transmission mechanism.

When the first vulcanizing equipment C520 is vulcanizing, the entire first vulcanizing equipment C520 is started, the heat roller assembly C530 is heated to the set temperature and kept warm, and then the motor of the winding assembly C540 is started, and the winding mechanism C540 starts to work . The decelerating motor drives the winding mechanism C540 and the heat roller assembly C530 through the driving sprocket C541 and the winding driving wheel C542. With the movement of the winding mechanism C540 and the heat roller assembly C530, the ink transfer medium 10 is passing by the traction of the traction cloth. When the heating roller C540 is vulcanized, the ink transfer medium 10 is wound on the winding roller of the winding mechanism C140 by the winding mechanism C540, and the first stage of vulcanization of the ink transfer medium 10 is completed. Then go to step S4.

Please refer back to FIG. 9 and FIG. 10, in the step S4, the surface adhesive layer sheet material is pressed on the second base material layer sheet material, more specifically, the first base material is laminated The other surface of the second base material sheet of the material layer sheet and the air cushion layer sheet is calendered to join the surface adhesive layer sheet material. At this time, the pressing process can adopt, for example, a calendering equipment C300 and a splicing equipment. C400 is calendered, and the parameters in the pressing process of the calendering equipment C300 are, for example, the temperature is 100-200°C, such as 100-170°C, such as 150°C, 162°C, 165°C, and the pressure is 5-12 MPa, such as 5.5MPa, 8.5MPa, 10MPa; roll spacing is 0.05-5mm, such as 0.06mm, 0.08mm, 1mm, 3mm, 3.5mm; calendering rate is 5-15m/h, such as 6m/h, 8m/h, 12m/ h.

Please refer to FIGS. 9-10 and 13, in the step S4, the second stage vulcanization is performed, that is, the overall vulcanization is performed to obtain the final product including the first substrate layer 11, the air cushion layer 12, and the second substrate layer 13. , And the ink transfer medium 10 of the top glue layer 14. The second-stage vulcanization is vulcanized under a light pressure environment, such as 0.5-3kg, such as 1kg, 1.5kg, so that the air cushion layer 12 with a cell structure will not be exposed to excessive pressure. destroy. The second vulcanization equipment C600 is used for vulcanization, and the ink transfer medium 10 can be obtained after the above process.

Next, referring to FIG. 13, the second vulcanizing equipment C600 includes a conveying component C610, a tensioning component C620, a vulcanizing component C630, and a receiving component C640. The second vulcanization equipment C600 vulcanizes the ink transfer medium that has undergone the first stage of vulcanization to obtain the finished ink transfer medium 10.

Next, referring to FIG. 13, the conveying component C210 includes a conveying frame C211, an unwinding component C212, and a pressing component C613. In some embodiments, the unwinding assembly C612 is rotatably arranged on the conveying frame C611, which includes a first unwinding roller C612a, a second unwinding roller C612b, a first unwinding roller C612a, and a second unwinding roller C612b. The second unwinding roller C612b supports the ink transfer medium 10 and stretches it to the ink transfer medium after the first stage vulcanization, such as the first substrate layer 11, the air cushion layer 12, and the third substrate layer 13, The top rubber layer 14 to the pressing assembly C613, the first unwinding roller C611a is installed with a rectifier to keep the ink transfer medium 10 from skewing during the conveying process, and further, the conveying assembly C610 includes Close the diaphragm.

Next, referring to FIG. 13, the pressing assembly C613, such as a pneumatic pressing assembly, is located after the unwinding assembly C612. In some embodiments, it includes a first pressing roller C613a and a second pressing roller C613b, the second pressing roller C613b is located below the first pressing roller C613a, and has a roller distance of 1-20 mm between the first pressing roller and the first pressing roller, so that the first pressing roller can be adjusted The pressure between the roller C613a and the second pressing roller C613b squeezes the ink transfer medium that has undergone the first stage of vulcanization, especially for calendering to obtain the ink transfer medium, which improves the adhesion between the layers The force and the stability between the layers, and further ensure that the subsequent second vulcanization process is more uniform and stable. The first pressure roller C613a and the second pressure roller C613b have the same structure, for example, The diameter of the first pressing roller C613a is, for example, 20-100mm, such as 38mm, 50mm, 60mm, 76mm, 89mm.

Next, referring to FIG. 13, a first turning roller C614 is arranged after the pressing assembly C613b, which draws the ink transfer medium that has undergone the first stage of vulcanization to the tensioning assembly C620.

Next, referring to Figure 13, the tensioning assembly C620 is located after the conveying assembly C610, more specifically, after the turning roller C614. In some embodiments, the tensioning assembly C620 includes a tensioning frame C621 and a tensioning frame C621. The tension roller C222, the tension roller C622 is rotatably connected to the tension frame C621, tensioning the ink transfer medium after the first stage of vulcanization, for example, the tension is 30N/m, especially for the calendered The ink transfer medium can thereby improve the stability of the vulcanization process and further improve the flatness of the ink transfer medium. In some embodiments, the tension roller C622 includes a plurality of, such as 3, 6, 8, 9, and the plurality of tension rollers C622 are arranged in parallel, and furthermore, the tension rollers C622 are arranged staggered and stretched. The ink transfer medium. A second turning roller C615 is further arranged after the tension roller C622, which drafts the ink transfer medium that has undergone the first stage vulcanization to the tension assembly vulcanization assembly C630.

Next, referring to FIG. 13, in another specific embodiment of the present application, the second vulcanizing device C600 may further include a defoaming component C650, the defoaming component C650 is located on the tensioning component C620 and the vulcanizing Between the components C630, for example, near the second turning roller C615, the defoaming component C650 is used to defoam the bubbles in the ink transfer medium.

Next, referring to FIG. 13, the vulcanization component C630 is located after the tension component C620, and is further located after the defoaming component C650. In some embodiments, the vulcanization component C630 includes, a vulcanization frame C631, a first vulcanization adjustment Roller C632, second vulcanization adjustment roller C633, vulcanization drum C634, steel belt C635, stretch roller C636 and power unit C637. Specifically, the first vulcanization roller C232 is driven to rotate by the power unit C637, so that the steel belt C635 drives the vulcanization drum C634, the second vulcanization roller C633, and the elongation roller C636 to rotate, and the ink transfers The medium can enter between the second vulcanization regulating roller C633 and the vulcanization drum C634, and pass the vulcanization drum along the steel belt C635, so as to perform the second stage of heating and vulcanization on the vulcanization drum C634, wherein the vulcanization drum A thermally conductive steel plate is arranged outside the arc on one side of the C634, and the distance between the C634 and the vulcanizing drum is 2-4mm, for example, 2mm, 3mm, 3.5mm.

Next, referring to FIG. 13, the receiving component C640 is located behind the vulcanizing component C630 to receive the ink transfer medium of the second unit vulcanized C600.

Please refer back to FIG. 9 and FIG. 10. In some embodiments, it may further include a step S5 of polishing the surface of the ink transfer medium 10, that is, polishing the surface rubber layer 14, for example, using a polishing device C700, For example, grinders such as a roller leather grinder, a stainless steel plate, a belt-type wood laminate grinder, etc. are used for polishing, and the surface roughness, thickness, and unevenness of the ink transfer medium 10 are controlled to fall within the above-mentioned range.

According to the present application, in the process of preparing the ink transfer medium 10, the multi-layer structure of the ink transfer medium 10 is formed by a calendering process, and the air cushion layer 12 in the ink transfer medium 10 is on the first substrate layer. The penetration thickness on 11 is less than or equal to the thickness on the first substrate layer 11, and the interlayer adhesion between the first substrate layer 11 and the second substrate layer 13 is greater than or equal to 1.5KN/m , The residual amount of the organic solvent of the ink transfer medium 10 is less than or equal to 0.1PPM, which avoids the impregnation problem caused by the coating process, improves the product qualification rate, avoids resource waste and environmental pollution problems, and also improves the working environment , Can be widely used in industrial production.

The foregoing descriptions are only preferred embodiments of the application, and are not intended to limit the application. For those skilled in the art, without conflict, the features in the foregoing embodiments can be combined with each other, and the application also There can be various changes and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application. In addition, the embodiments should be regarded as exemplary and non-limiting. The scope of this application is defined by the appended claims rather than the above description, and therefore it is intended to fall within the meaning and scope of equivalent elements of the claims. All the changes are included in this application. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims (20)

1. An ink transfer medium, including at least,

   The first substrate layer;

   An air cushion layer located on the first substrate layer;

   The second substrate layer is located on the air cushion layer;

   The surface adhesive layer is located on the second substrate layer;

   Wherein, the penetration thickness of the air cushion layer on the first substrate layer is less than or equal to the thickness on the first substrate layer, and the layer between the first substrate layer and the second substrate layer The inter-adhesive force is greater than or equal to 1.5 KN/m, and the residual amount of the organic solvent of the ink transfer medium is less than or equal to 0.1 PPM.
2. The ink transfer medium according to claim 1, wherein the compressibility of the ink transfer medium is 0.12-0.24 mm under a printing load of 800-1500Kpa, and the ink transfer medium 10 is under a printing load of 1800-2500Kpa. The compressibility is 0.20-0.32mm.
3. 8. The ink transfer medium of claim 1, wherein the first substrate layer comprises:

   The first cloth layer

   The first adhesive layer is located on the first cloth layer;

   The second cloth layer is located on the first adhesive layer;

   Wherein, the radial elongation of the first cloth layer is less than or equal to 4.5%, and/or the radial strength is greater than or equal to 1900 KN/m.
4. 3. The ink transfer medium of claim 3, wherein the thickness of the first cloth layer is greater than or equal to the thickness of the second cloth layer, and the thickness of the first cloth layer is 0.37-0.41 mm.
5. 8. The ink transfer medium according to claim 1, wherein the thickness of the first substrate layer and the second substrate layer in the ink transfer medium account for 45-50%.
6. 8. The ink transfer medium of claim 1, wherein the air cushion layer has a fully closed micropore structure formed by a microsphere capsule foamed vulcanized rubber component, and the fully closed micropores have a pore diameter of 1-100 μm.
7. 7. The ink transfer medium of claim 6, wherein the microsphere capsule is a polyurethane microsphere with a diameter of 0.01-1.5 μm.
8. The ink transfer medium of claim 1, wherein the air cushion layer includes a cross-linked structure, the cross-linked structure includes epoxy, acrylic, isocyanate, rubber, and support aids, and the compression of the air cushion layer The performance is 0.10～0.18mm, the tensile strength of the air cushion layer is ≥82N/mm, and the adhesion between the cloth layers on the upper and lower surfaces of the air cushion layer is 1.2～1.8KN/m.
9. The ink transfer medium of claim 8, wherein the support aid includes one or more of nano-scale silica, stearic acid, zinc chloride, light calcium carbonate, and plasticizer TP-90B combination.
10. 8. The ink transfer medium of claim 1, wherein the surface adhesive layer comprises nanostructures, the nanostructures include rubber and nanomaterials, and the Shore A hardness of the nanostructures is 70°-85°; The nanomaterial includes one or more combinations of graphene, carbon nanotubes, and nanosilica.
11. The ink transfer medium according to claim 1 or 10, wherein the surface roughness Ra of the first surface of the surface adhesive layer is 0.8-1.4 microns, and the adhesion between the cloth layers of the second surface of the surface adhesive layer is 1.2～1.8KN/m.
12. 2. The ink transfer medium of claim 1, wherein the surface adhesive layer comprises the following components: 50-200 parts by mass of the first nitrile rubber, 0-100 parts by mass of the second nitrile rubber, 2-20 parts by mass Parts of nano material, 2-20 parts by mass of zinc chloride, 0.5-5 parts by mass of stearic acid, 7-35 parts by mass of plasticizer TP-90B, and 0-15 parts by mass of light calcium carbonate.
13. 8. The ink transfer medium according to claim 1, wherein the shrinkage rate of the topcoat layer is 2 to 2.5% under the conditions that the ink contact time is 20-24 hours and the contact temperature is 35±2°C.
14. A preparation method of an ink transfer medium, wherein the preparation method at least includes:

    Provide the first substrate layer sheet material, the air cushion layer sheet material, the second substrate layer sheet material, and the surface adhesive layer sheet material;

    Pressing the air cushion layer sheet material on the first substrate layer sheet material;

    Pressing the second base material layer sheet material on the air cushion layer sheet material, and performing the first stage vulcanization;

    The surface rubber layer sheet material is pressed on the second substrate layer sheet material, and the second stage vulcanization is performed to obtain a first substrate layer, an air cushion layer, a second substrate layer, and a surface rubber layer Ink transfer medium;

    Wherein, the penetration thickness of the air cushion layer on the first substrate layer is less than or equal to the thickness on the first substrate layer, and the layer between the first substrate layer and the second substrate layer The inter-adhesive force is greater than or equal to 1.5 KN/m, and the residual amount of the organic solvent of the ink transfer medium is less than or equal to 0.1 PPM.
15. The method for preparing an ink transfer medium according to claim 14, wherein the pressing process includes pressing in a calendering device, wherein the calendering parameters include:

    The temperature is 100-170℃;

    The pressure is 5-12MPa;

    The roller spacing is 0.05-5mm;

    The rolling rate is 5-15m/h.
16. The method for preparing an ink transfer medium according to claim 14, wherein the first stage vulcanization is staged vulcanization by a plurality of heating temperatures, and the plurality of heating temperatures include:

    The first vulcanization temperature, the first vulcanization temperature is 85-100°C;

    The second vulcanization temperature, the second vulcanization temperature is 100-130°C;

    The third vulcanization temperature, the third vulcanization temperature is 130-160°C.
17. The method for preparing an ink transfer medium according to claim 14, wherein the vulcanization parameter of the second stage vulcanization is selected from at least one of the following items,

    The temperature is 140℃-160℃;

    The pressure is 3-8kg;

    The time is 8-24h.
18. The method for preparing an ink transfer medium according to claim 14 or 17, wherein the second-stage vulcanization is completed by a second vulcanization device, and the first vulcanization device includes:

    Conveying components, conveying the ink transfer medium to be vulcanized in the second stage;

    A tensioning component is arranged after the conveying component to tension the ink transfer medium to be vulcanized in the second stage;

    The vulcanization component is arranged after the tension component to be heated and vulcanized to obtain the ink transfer medium after the second stage vulcanization;

    The receiving component is arranged after the vulcanizing component to receive the ink transfer medium after the second stage vulcanization.
19. The preparation method of the ink transfer medium according to claim 14, wherein the preparation method of the surface adhesive layer sheet material comprises: mixing rubber with nanomaterials to form nanostructures to obtain mixed rubber; The compounded rubber is calendered out to obtain the surface rubber layer sheet material; wherein, the compounding process of the compounded rubber includes:

    Pull rubber into thin sheets to obtain plastic rubber;

    Mixing the plastic rubber with the nano material, and performing the first stage mixing to obtain the first mixed rubber;

    The first compounded rubber is mixed with powder, and the second stage of mixing is carried out to obtain a second compounded rubber; wherein the Mooney value of the first compounded rubber is 48-55, and the second compounded rubber The Mooney value of the refining rubber is 40-48, and the powder is selected from one or more combinations of sulfur, stearic acid, zinc chloride, antioxidants, coloring agents and accelerators.
20. The method for preparing an ink transfer medium according to claim 19, wherein in the first stage of mixing, the temperature is 70 to 80° C., and the pressure is 4 to 5 MPa; in the second stage of mixing, the temperature It is 50～60℃, and the pressure is 2～3MPa.

Images