CN111548541A

CN111548541A - Air cushion layer for ink transfer medium and preparation method and application thereof

Info

Publication number: CN111548541A
Application number: CN202010323426.6A
Authority: CN
Inventors: 徐佳; 徐毛清; 刘竟
Original assignee: Jiangsu Kangpu Printing Technology Co ltd
Current assignee: Jiangsu Kangpu Printing Technology Co ltd
Priority date: 2020-04-22
Filing date: 2020-04-22
Publication date: 2020-08-18
Anticipated expiration: 2040-04-22
Also published as: CN111548541B

Abstract

The invention discloses an air cushion layer for an ink transfer medium, a preparation method and application thereof, wherein the air cushion layer has a fully-closed micropore structure formed by microsphere capsule foaming vulcanized rubber components, and the compression distance of the air cushion layer is 0.12-0.24mm under the load of 800-1500 Kpa; the compression distance is 0.20-0.24mm under the load of 1800-2500 Kpa. The ink transfer medium provided by the invention is safe and environment-friendly, and has the advantages of good stability, high strength and good rebound resilience, and the printing speed can reach 1.5 ten thousand prints of high-speed printing.

Description

Air cushion layer for ink transfer medium and preparation method and application thereof

Technical Field

The invention belongs to the technical field of printing, and particularly relates to an air cushion layer for an ink transfer medium, and a preparation method and application thereof.

Background

In the field of offset printing, an ink transfer medium can be wound on a transfer cylinder so as to transfer ink on a printing plate to the surface of a printing stock, and the performance requirement of the ink transfer medium is higher and higher along with the development of the printing industry.

The air cushion layer of the ink transfer medium is the key of the ink transfer medium, the current microporous structure formed by the foaming rubber component of the chemical foaming agent in the air cushion layer has the problems of incomplete micropores, low strength and uneven compression, and in addition, the preparation of the air cushion layer is generally realized by coating the slurry of the air cushion layer on the substrate layer, obtained by foaming vulcanization, the trend that solvent-free ink transfer media are increasingly new in composition from the viewpoint of obtaining green environmental protection, when the new calendering process is adopted, in order to solve the binding force between the cloth layers, a certain pressure needs to be applied when the air cushion layer is vulcanized, the microspheres in the air cushion layer are deformed due to improper pressure control, the compressibility of the rubber blanket is affected, and the product is scrapped, the simultaneous calendering process has high requirements on the viscosity and the flowability of the sizing material, and the air cushion layer is easy to deform in the calendering process to cause the problem of uneven cell structure. In addition, the natural rubber component is adopted in the general air cushion layer to improve the bonding force with the base material, but the natural rubber component is easy to cause the problem of slurry permeation to the base material layer, so that a new air cushion layer and a preparation method thereof are needed to be developed to solve the problems of the bonding force with the base material and the slurry permeation to the base material layer.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide an air cushion layer for an ink transfer medium, which can be applied to a calendaring process, and has the advantages of high strength of foamed air holes, uniform air holes, small deformation after being pressed, high compressibility, safety and environmental protection.

It is another object of the present invention to provide a method for making an air bearing layer for an ink transfer media as described above.

It is another object of the present invention to provide an ink transfer medium resulting from the air bearing layer as described above.

To achieve the above and other related objects, a first aspect of the present invention provides a cushion layer for an ink transfer medium, the cushion layer having a fully closed cell structure formed of a microsphere capsule foamed vulcanized rubber composition, the cushion layer having a compression distance of 0.12 to 0.24mm under a load of 800-1500 Kpa; the compression distance is 0.20-0.24mm under the load of 1800-2500 Kpa.

In some embodiments of the invention, the rubber component comprises a nitrile rubber.

In some embodiments of the invention, the microsphere capsules are polyurethane microspheres, 0.01 to 1.5 μm in diameter.

In some embodiments of the present invention, the fully-closed micro-pores have a pore size of 1-100 μm.

In some embodiments of the invention, the air cushion layer has a thickness of 0.3-0.6mm and is vibrated up and down 6.5 to 10 times per second.

In some embodiments of the invention, the fully-closed microporous structure is obtained by foaming and vulcanizing in an environment of 0-0.1 kg.

The invention provides a preparation method of an air cushion layer for an ink transfer medium, which comprises the following steps: providing a plurality of feedstock components, the feedstock components comprising: microsphere capsules and a rubber component; foaming and vulcanizing a plurality of raw material components to obtain the air cushion layer, wherein the compression distance of the air cushion layer is 0.12-0.24mm under the load of 800-1500 Kpa; the compression distance is 0.20-0.24mm under the load of 1800-2500 Kpa.

In some embodiments of the invention, the temperature of the foamed vulcanizate comprises a plurality of different temperature intervals.

In some embodiments of the present invention, the vulcanizing the air cushion layer includes vulcanizing in an environment of 0-0.1 kg.

In a third aspect, the present invention provides an ink transfer medium comprising, a first substrate layer; the air cushion layer is positioned on the first base material layer; the second substrate layer is positioned on the air cushion layer; the surface adhesive layer is positioned on the second base material layer; wherein the air cushion layer is of a fully-closed micropore structure formed by microsphere capsule foaming vulcanized rubber components, and the compression distance of the air cushion layer is 0.12-0.24mm under the load of 800-1500 Kpa; the compression distance is 0.20-0.24mm under the load of 1800-2500 Kpa.

As described above, the present invention provides an air bearing layer for an ink transfer medium and a method of making the same. The air cushion layer is of a fully-closed micropore structure formed by foaming a vulcanized rubber component through microsphere capsules, and the compression distance of the air cushion layer is 0.12-0.24mm under the load of 800-1500 Kpa; under the load of 1800 plus 2500Kpa, the compression distance is 0.20-0.24mm, so that the foaming porous material is suitable for calendering process, and has high strength, uniform pores, small deformation after being stressed and high compressibility. In addition, based on the balance between the adhesive force and the slurry seepage between the air cushion layer and the base material, the residual quantity of organic solvent of the ink transfer medium containing the air cushion layer provided by the invention is less than or equal to 0.1PPM, the product yield is high, the problems of resource waste and environmental pollution are avoided, the working environment is improved, the stability is good, the strength is high, the rebound resilience is good when the air cushion layer is used, and the printing speed can reach 1.5 ten thousand-prints. Other features and advantages may be apparent from the following claims and from the description.

Drawings

FIG. 1 shows a schematic representation of an ink transfer medium provided in accordance with the present invention in use.

FIG. 2 is a schematic structural diagram of an embodiment of an ink transfer medium according to the present invention.

FIG. 3 is a schematic structural diagram of another embodiment of an ink transfer medium according to the present invention.

FIG. 4 is a schematic diagram showing the cell structure of the air-cushion layer in the ink transfer medium provided by the present invention.

FIG. 5 shows an optical microscope photograph at 100 times magnification of a gas cushion layer in an ink transfer medium provided by the present invention.

Fig. 6 shows an optical microscope photograph of the box portion of fig. 5 at 1000 x magnification.

FIG. 7 shows the roughness of a size layer in an ink transfer medium provided in accordance with the present invention.

FIG. 8 is a front view of the appearance of a size layer in an ink transfer medium provided in accordance with the present invention.

FIG. 9 is a schematic flow chart diagram illustrating an embodiment of an air bearing layer provided in the present invention.

FIG. 10 illustrates an exemplary block diagram of an ink transfer media manufacturing apparatus provided in accordance with the present invention.

FIG. 11 is a schematic view showing the construction of the first vulcanizing apparatus of FIG. 10.

Fig. 12 shows an optical microscope photograph at 100 x magnification of the air bearing layer prepared in comparative example 1.

Detailed Description

The present invention is further illustrated by the following specific examples, but it should be noted that the specific material ratios, process conditions, results, etc. described in the examples of the present invention are only for illustrating the present invention and should not be construed as limiting the scope of the present invention, and all equivalent changes and modifications made according to the spirit of the present invention should be covered by the scope of the present invention. Note that "%" shown in the description herein means "part by mass" unless otherwise specified.

As used herein, the singular forms "a", "an" and "the" include the plural forms unless the context clearly dictates otherwise. Thus, for example, reference to "a compound" includes a plurality of such compounds, and reference to "a component" or "an additive" means that one or more components or additives, and equivalents thereof, and the like, known to those skilled in the art can be employed.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although any methods and materials similar or equivalent to those described herein can be used in the practice of the present invention, the preferred methods, devices, and materials are described below. All publications mentioned herein are intended to describe and disclose the various layers, compounds, compositions, methods, and the like, which are reported in the publications and which may be used in connection with the invention.

As shown in fig. 1, the ink transfer medium 10 may be coated on a transfer cylinder 101 of an offset printing press 100, so that the ink is directly transferred from the surface of the ink transfer medium 10 to the printing material 30 as a medium for ink transfer in a lithographic (offset) process. Specifically, this can be achieved by a process including rotating a transfer cylinder 101 coated with the ink transfer medium 10 in close contact with a plate cylinder 102 having characters and images formed thereon and provided with printing ink, so that the characters and images on the printing plates 20 located at the plate cylinder 102 are transferred onto the ink transfer medium 10, and then the characters and images on the ink transfer medium 10 are (transferred and) positioned on a substrate 30 such as a sheet of paper of an impression roller 103, which is conveyed in close contact with the ink transfer medium 10, to perform printing.

As shown in fig. 2, the ink transfer medium 10 provided by the present invention includes a first substrate layer 11, an air-cushion layer 12, a second substrate layer 13, and a topcoat layer 14. The ink transfer medium 10 is formed as a laminate having a multilayer structure, the first base material layer 11 is an innermost layer and covers the transfer cylinder 101 of the printing press 100, the size layer 14 is an outermost layer, and the ink on the printing plate 20 of the plate cylinder 102 is transferred by adhering to the size layer 14 of the ink transfer medium 10.

The thickness of the ink transfer medium 10 is the sum of the thicknesses of the first base material layer 11, the air cushion layer 12, the second base material layer 13, and the surface adhesive layer 14 forming the ink transfer medium 10, and is, for example, 1.8 to 2.5mm, and further, is, for example, 1.95mm, 2.00mm, and 2.05mm, because the ink transfer medium 10 has a desirable strength and is not easily deformed. Further, the thickness of the ink transfer medium 10 varies by, for example, 0.03mm or less, for example, 0.01mm or 0.02 mm.

The ink transfer medium 10 has a shore a hardness of, for example, 70 ° to 85 °, such as 76 °, 78 °, 81 °; has a tensile strength of 80KN/m or more, further 90KN/m or more, for example, 95KN/m, 100KN/m, 105 KN/m; has an elongation of 2.0% or less, further 1.6% or less, such as 1.4%, 1.0%, 0.9%; and has a compressibility of 0.10 to 0.18mm, such as 0.20mm, 0.66mm, 0.1mm, and more specifically, in some embodiments, at a print load of 800-1500Kpa, such as 900Kpa, 100Kpa, 1060Kpa, the compressibility of the ink transfer medium 10 is, for example, 0.12 to 0.24mm, such as 0.13mm, 0.14mm, 0.20mm, and at a print load of 1800-2500Kpa, such as 2060Kpa, 2100Kpa, 2300Kpa, the compressibility of the ink transfer medium 10 is, for example, 0.20 to 0.32mm, such as 0.22mm, 0.24mm, 0.28 mm. The interlayer adhesion between the multiple layers of the ink transfer medium 10 is not less than 1.5KN/m, and more specifically not less than 1.8KN/m, and the surface roughness Ra of the ink transfer medium 10 is 0.8 to 1.4 [ mu ] m, for example, 0.9 [ mu ] m, 1.0 [ mu ] m, and 1.3 [ mu ] m.

The organic solvent residue in the ink transfer medium 10 refers to a sum of organic solvent residues of each 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, which is less than or equal to 0.1PPM, further less than or equal to 0.05PPM, and further still, the organic solvent residue is 0, and specifically, in some embodiments, the organic solvent residue may be avoided or greatly reduced in the process of manufacturing the ink transfer medium 10 by using the first substrate layer 11, the air cushion layer 12, the second substrate layer 13, and the surface adhesive layer 14.

In some examples, the organic solvent in the ink transfer medium 10 may be selected from ketone solvents, for example, dialkyl ketones such as acetone, methyl ethyl ketone, methyl n-propyl ketone, methyl isopropyl ketone, diethyl ketone, methyl n-butyl ketone, methyl isobutyl ketone, methyl sec-butyl ketone, and methyl tert-butyl ketone, cyclic ketones such as cyclopentanone, cyclohexanone, and cycloheptanone, and the like. Further, the material is selected from acetone, butanone and cyclohexanone.

In some embodiments, the organic solvent in the ink transfer medium 10 may be selected from, for example, aromatic solvents, specifically, toluene, benzene, p-xylene, o-xylene, m-xylene, ethylbenzene, naphthalene, acetophenone, benzyl alcohol, ethyl benzoate, benzoic acid, phthalate esters (e.g., dimethyl phthalate (DMP), diethyl phthalate (DEP), di-n-butyl phthalate (DBP), di-n-octyl phthalate (DOP), di-iso-octyl phthalate (DEHP), and Butyl Benzyl Phthalate (BBP)), and the like. Further, it is selected from benzene, toluene, xylene, and phthalate.

In some embodiments, the organic solvent in the ink transfer medium 10 may be selected from ester solvents, and specifically, alkyl esters such as ethyl acetate, propyl acetate, isopropyl acetate, and butyl acetate, alkoxyalkyl esters such as 1-methoxy-2-propyl acetate, and cyclic esters such as β -propiolactone, α -methyl- γ -butyrolactone, -caprolactone, and γ -valerolactone.

In some examples, the organic solvent in the ink transfer medium 10 may be selected from amide solvents, and specific examples thereof include alkylamides such as N, N-dimethylformamide, N-dimethylacetamide, N-diamylacetamide, and N, N-di-tert-butylacetamide, alkoxyalkylamides such as N, N-dimethoxypropylacetamide, 3-methoxy-N, N-dimethylpropionamide, and 3-N-butoxy-N, N-dimethylpropionamide, and cyclic amides such as 1, 3-dimethyl-2-imidazolidinone, and N-methyl-2-pyrrolidone.

In some embodiments, the organic solvent in the ink transfer medium 10 may be selected from ether solvents, specifically, mono-or dialkyl ethers such as ethylene glycol and diethylene glycol, cyclic ethers such as dioxane and tetrahydrofuran, and aromatic ethers such as anisole.

Referring next to fig. 2, in some embodiments, the first substrate layer 11 includes a first fabric layer 111, a first adhesive layer 112 and a second fabric layer 113, for example, the first fabric layer 111 and the second fabric layer 113 may be of the same or different structures, such as long stapled cotton cloth, linen cloth, non-woven cloth, etc., the first substrate layer 111 formed by the first fabric layer 111 and the second fabric layer 113 is a supporting framework of the ink transfer medium 10, and from the viewpoint of ensuring that the ink transfer medium 10 has sufficient radial tensile strength and elongation as small as possible to obtain good applicability, for example, long stapled cotton cloth, linen cloth, non-woven cloth, etc., such as long stapled cotton cloth, further, the first fabric layer 111 and/or the second fabric layer 113 has a thickness of 0.3-0.5mm, such as 0.35mm, 0.37mm, 0.39mm, 0.4mm, and a seam of 0.03 mm-0.8 mm (i.e., a gap between the warp yarn and the weft yarn), e.g. 0.04mm, 0.06mm, 0.069mm, having a particle size of 180-²Gram weight of (2), e.g. 200g/m²、220g/m²Has a radial strength of 1800 or more, further 1900 or more, for example 1950, 2000, 2200 and, more importantly, the first fabric layer 111 has a radial elongation of 5% or less, further 4.8% or less, for example 4.5%, 4%, and has a constant elongation of 1.6% or less, further 1.5% or less, for example 1.4%, 1.3%. The first fabric material within the above range is not elongated, is not broken, and is not deformed, and has a good affinity with the air cushion layer 12 and the surface adhesive layer 14, and is easy to be usedThe first base material layer 11 is bonded to the ink transfer medium so as not to easily fall off, and therefore, the ink transfer medium 10 can be subjected to a radial force of 500kg or more, and further subjected to a radial force of 1000kg without deformation, and has excellent compressibility and flexibility.

Referring to fig. 3, the first adhesive layer 112 is disposed between the first fabric layer 111 and the second fabric layer 113 for adhering them without glue leakage, and the interlayer adhesion between the first fabric layer 111 and the second fabric layer 113 should have an adhesive force of 1.5KN/m or more, and further 1.8KN/m or more, based on the adhesion of the first adhesive layer 112, so that the ink transfer medium 10 is prevented from being broken by radial stress during use. The first adhesive layer 112 may employ, for example, an anaerobic adhesive such as butyl acrylate and C2 to C10 alkyl esters, which are usually acrylic acids; epoxy resins, for example one-component resin adhesives, such as dicyandiamide (cyanoguanidine), or two-component systems using polyfunctional amines or polyfunctional acids as curing agents, or using cyanoacrylates; or a hot melt adhesive such as polyethylene, polyvinyl acetate, polyamide, hydrocarbon resin, resinous material, and wax, and may also be a pressure sensitive adhesive. The thickness of the first adhesive layer 112 is, for example, 0.1mm to 0.5mm, such as 0.13mm, 0.2mm, 0.3 mm.

Referring to fig. 3, in other embodiments, the first substrate layer 11 may include a first fabric layer 111, a first adhesive layer 112, a second fabric layer 113, a second adhesive layer 114, and a third fabric layer 115, so that a plurality of layers of the ink transfer medium 10 are formed by increasing the number of layers of the first substrate layer 11. The second adhesive layer 114 may, for example, be the same or different structure than the first adhesive layer 112. The third cloth layer 115 may have the same or different structure as the first cloth layer 111 and/or the second cloth layer 113, for example. In this case, in the first base material layer 11 within the above-described structural range, the thickness between the first, second, and third fabric layers 111, 113, and 115 may have a thickness of D, for example₁₁₁Greater than or equal to D₁₁₃Greater than or equal to D₁₁₅For example, the thickness may be 0.37mm, respectively; 0.39mm, 0.37 mm; 0.37mm, 0.35 mm; 039mm, 0.37mm, 0.35mm, etc., the first fabric layer 111, the second fabric layer 113, and the third fabric layer 115 should have a tensile strength of 50kgf/cm or more and a breaking tensile rate of 7.5% or less, so that the ink transfer medium 10 is prevented from being broken by pressure applied thereto during printing and good flexibility is ensured.

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

Referring next to fig. 2 and fig. 4 to 6, the air cushion layer 12 is located on the first substrate layer 11, and the air cushion layer 12 is a fully-closed micro-porous structure formed by a microsphere capsule foaming vulcanized rubber component, specifically, in some embodiments, the raw material components of the air cushion layer 12 include, for example, the microsphere capsule, the rubber component, and an auxiliary agent. Further, the microcapsules form a fully closed micropore structure after being vulcanized and foamed, the micropores are fully closed micropores with the diameter of 1-100 μm, for example, further, 5-30 μm, for example, 10 μm, 13 μm, the pores are uniform and complete, the average porosity is 70-80%, and the air cushion layer 12 has a compression distance of 0.12-0.24mm under the load of 800-1500Kpa, for example; the compression distance is 0.20-0.24mm under the load of 1800 + 2500Kpa, which ensures that the micro-holes absorb the printing pressure during the printing process without forming bulges on the surface of the ink transfer medium 10, causing dot deformation, and that the micro-holes are rapidly restored after the printing pressure is removed, so that the pressure during the printing process is kept substantially constant, and therefore, the printing speed can reach a high-speed printing of 1.5 ten thousand prints, and further more than or equal to 1.8 ten thousand prints, such as 2 ten thousand prints, based on the characteristics of the air cushion layer 12.

Referring back to fig. 2, the thickness of the air cushion layer 12 is, for example, 0.2-0.8mm, further, for example, 0.3-0.6mm, such as 0.26mm, 0.35mm, 0.42mm, 0.5mm, 0.56mm, 0.78mm, and the air cushion layer 12 has 6.5 to 10 times of up and down vibration per second based on the micro-pore structure of the air cushion layer 12.

In some embodiments, the microspheres may be a polyurethane microsphere blowing agent, the polyurethane microspheres comprising a polyurethane shell and a gas encapsulated therein, forming tiny spherical plastic particles, which soften when heated and expand the gas within the shell, causing the expanded microspheres to increase in volume and become a 100% enclosure and return to their original volume after the pressure is released. The polyurethane microsphere foaming agent has a foaming temperature of, for example, 80-190 ℃ and a diameter of, for example, 0.7-1.4. mu.m, such as 0.8. mu.m, 1 μm. The microspheres may be formed from acrylonitrile or a copolymer of acrylonitrile, and further include isobutane, 2, 4-dimethylbutane, 2-methylpentane, 3-methylpentane, n-hexane, cyclohexane, heptane, isooctane, or any combination thereof in the raw material components of the microspheres, or other suitable polymeric microspheres, such as those prepared by emulsion polymerization, emulsified to obtain polymeric particles, which are then sieved and dried to obtain the microspheres, wherein the average particle diameter of the polymeric particles may be 0.02-0.05mm, such as 0.02-0.05 mm. Sample microspheres of similar average particle size were obtained by sieving, and the effect of particle size non-uniformity on expansion in use of the flexographic plate was limited.

In some embodiments, the rubber component may be, for example, acrylonitrile/butadiene rubber (NBR), neoprene (CR), fluoro rubber (FKM), Urethane Rubber (UR), ethylene propylene rubber (EPDM), butyl rubber (IIR), or the like. Based on the problem of improving the balance between the adhesion force between the air cushion layer 12 and the first substrate layer 11 and the second substrate layer 13 and the slurry, the rubber component may be nitrile rubber, and further when the calendering process is applied, the development including speed, temperature and pressure is performed, and the nitrile rubber and other raw material components are mixed and foamed.

In some embodiments, the adjuvants are, for example, vulcanizing agents, antioxidants, reinforcing agents, fillers, plasticizers, and the like. Such as carbon black, white carbon, silica, titanium dioxide, calcium carbonate, colored pigments, clays, and combinations thereof, and reinforcing agents such as zinc stearate and/or zinc oxide.

Specifically, in some embodiments, the air bearing layer 12 comprises, for example, the following components: 0.1-30 parts of microspheres, 0-200 parts of nitrile rubber and 3-10 parts of nano white carbon black, or for example, the microsphere, the nitrile rubber, the nano white carbon black, the stearic acid, the zinc chloride, the light calcium carbonate and the plasticizer TP-90B are 0.1-30 parts of microspheres, 5-20 parts of nitrile rubber, 1-2 parts of nano white carbon black, 2-3 parts of stearic acid, 2-6 parts of zinc chloride, 3-5 parts of light calcium carbonate and 2-9 parts of plasticizer. Wherein, 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. Wherein 0.1 to 30 parts by mass of the microspheres are obtained by mixing mainly 0 to 100% by weight of epoxy resin, 0 to 100% by weight of acrylic acid, 0 to 100% by weight of isocyanate, and 0 to 100% by weight of polyurethane microspheres, followed by some post-treatment steps. The light calcium carbonate can improve the performances of the air cushion layer such as hardness and the like.

Referring to fig. 4 to 6, the penetration thickness of the air cushion layer 12 on the first substrate layer 11 is smaller than or equal to the thickness of the first substrate layer 11, which is specifically the penetration of the glue layer slurry of the air cushion layer 12 on the other side of the first substrate layer 11, and is further smaller than the thickness of the first substrate layer 11, for example, the penetration thickness of the air cushion layer 12 on the second fabric layer 113 may be smaller than or equal to the thickness of the second fabric layer 113, specifically, for example, 0mm, 0.06mm, 0.1mm, 0.2mm, and 0.35 mm. When the penetration thickness of the air cushion layer 12 on the first substrate layer 11 is smaller than or equal to the thickness of the first substrate layer 11, and the first substrate layer 11 is taken as the innermost layer, the surface of the first substrate layer 11 is prevented from being uneven due to the penetration of the air cushion layer 12, so that the printing quality is not ideal.

Referring back to fig. 2, the air cushion layer 12 is located between the first substrate layer 11 and the second substrate layer 13, and the interlayer adhesion between the first substrate layer 11 and the second substrate layer 13 should have an adhesive force of 1.5KN/m or more, and further 1.8KN/m or more based on the air cushion layer 12, so that the ink transfer medium 10 is prevented from being broken due to radial stress during use. Specifically, the air bearing layer 12 within the above range can solve the balance between the adhesion and the slurry bleeding, and further, for example, the use of a raw material component containing an organic solvent can be avoided during the production and the application of the air bearing layer 12.

Referring to fig. 2, the second substrate layer 13 is disposed on the air cushion layer 12, and the second substrate layer 13 may include a multi-layer structure formed by a cloth and an adhesive, such as a cloth layer, which has the same structure as the first substrate 11, such as a long-staple cotton cloth, a hemp cloth, a non-woven fabric, such as a long-staple cotton cloth, and further has a thickness of 0.3-0.5mm, such as 0.35mm, 0.37mm, 0.39mm, 0.4mm, and a cloth seam (i.e. a seam between the warp and the weft) of 0.03 mm-0.8 mm, such as 0.04mm, 0.06mm, 0.069mm, and 250 g/m/180-²Gram weight of (2), e.g. 200g/m²、220g/m²Has a radial strength of 1800 or more, further 1900 or more, for example 1950, 2000, 2200 and, more importantly, the third substrate layer 13 has a radial elongation of 5% or less, further 4.8% or less, for example 4.5%, 4%, and has a constant elongation of 1.6% or less, further 1.5% or less, for example 1.4%, 1.3%. The third base material layer 13 within the above range can be free from elongation, breaking, and deformation, has good affinity with the air cushion layer 12 and the surface adhesive layer 14, is easily adhered to the surface adhesive layer, and is less likely to fall off, and can suppress deformation of the ink transfer medium 10 and improve the tensile strength thereof.

Referring next to fig. 2 and 7-8, the size layer 14 is disposed on the second substrate layer 13, and the size layer 14 is the outermost layer of the ink transfer medium 10, directly contacting the ink, and transferring it to the substrate 103. The surface of the size layer 14, that is, the surface of the ink transfer medium 10, in some embodiments, from the viewpoint of obtaining the ink transfer medium 10 with properties of hardness, wear resistance, oil erosion resistance, chemical corrosion resistance, and the like, the surface roughness Ra of the size layer 14 is 0.8 to 1.4 μm, such as 0.9 μm, 1.0 μm, and 1.3 μm, the profile roughness, such as Rz, is 3 to 5um, the variation of the unevenness is 0.03mm or less, further, such as 0.02mm or less, and the shore a hardness is 70 ° to 85 °, such as 76 °, 78 °, and 81 °.

In some embodiments, the raw material components of the surface adhesive layer 14 include a first nitrile rubber and/or a second nitrile rubber, a nanomaterial, zinc chloride, stearic acid, a plasticizer, an anti-aging agent and/or an anti-aging agent white carbon black and/or light calcium carbonate, a first colorant, a second colorant, sulfur, a first accelerator, a second accelerator, and a scorch retarder, and the surface adhesive layer 14 can be obtained by mixing and vulcanizing the raw material components.

The rubber and the nano material form a nano structure, and the nano structure improves the hardness and the wear resistance of the surface rubber layer 14, increases the elasticity, the overall strength and the fatigue resistance, and meets the requirement of high-speed printing. In some embodiments, the nanomaterial comprises a combination of one or more of graphene, carbon nanotubes, and nanosilica. For example, a combination of graphene and nanosilica, for example, a combination of carbon nanotubes and nanosilica, for example, including a combination of graphene, carbon nanotubes and nanosilica. In the invention, the nano silicon dioxide is amorphous white powder, is nontoxic, tasteless and pollution-free, and has a spherical microstructure and a flocculent and reticular quasi-particle structure. The graphene has good resistance to ink penetration, and can enhance the performances of ink erosion resistance and chemical corrosion resistance. The carbon nanotube has a special structure, the radial dimension is nanometer magnitude, the axial dimension is micrometer magnitude, and both ends of the tube are basically sealed. The carbon nanotube mainly comprises several layers to tens of layers of coaxial circular tubes formed by carbon atoms arranged in a hexagon, wherein a fixed distance is kept between the layers, the distance is about 0.34nm, and the diameter is generally 2-20 nm. When the nano material is the combination of graphene and nano silicon dioxide, the network structure of the nano silicon dioxide is matched with the honeycomb structure of the graphene, so that the hardness, the wear resistance and other properties of the surface adhesive layer 14 are further enhanced. When the nano material is a combination of the carbon nano tube and the nano silicon dioxide, the nano silicon dioxide can be adsorbed on the tube wall of the carbon nano tube, and the hardness, the wear resistance and other properties of the system can be further enhanced, so that the surface adhesive layer 14 has a good ink transfer effect.

Referring to fig. 5, the thickness of the surface adhesive layer 14 is, for example, 0.15 to 0.5mm, such as 0.15mm, 0.23mm, 0.33mm, and 0.45mm, when the surface adhesive layer 14 provided by the present invention is formed on the second substrate layer 13, the surface adhesive layer 14 and the second substrate 13 do not penetrate into each other, that is, the surface roughness Ra of the surface adhesive layer 14 is 0.8 to 1.4nm, and the variation of the unevenness is less than or equal to 0.03mm, so as to avoid the texture structure of the second substrate 13 from being transferred to the printing material 103, such that the printing effect is not ideal.

Referring to fig. 9, the present invention also provides a method of forming an air bearing layer 12 in an ink transfer medium, including but not limited to,

-S1, providing a plurality of feedstock components, the feedstock components comprising: microsphere capsules and a rubber component;

s2, foaming and vulcanizing a plurality of raw material components to obtain the air cushion layer, wherein the compression distance of the air cushion layer is 0.12-0.24mm under the load of 800-1500 Kpa; the compression distance is 0.20-0.24mm under the load of 1800-2500 Kpa.

Referring to fig. 10, the air cushion layer 12 in the ink transfer medium can be realized by, for example, a process of a manufacturing apparatus C10 of the ink transfer medium, and specifically, in some embodiments, the manufacturing apparatus C10 includes a rubber mixing apparatus C100, a rubber filtering apparatus C200, a rolling apparatus C300, a splicing apparatus C400, a first vulcanizing apparatus C500, a second vulcanizing apparatus C600, a third vulcanizing apparatus C600, a fourth vulcanizing apparatus C400, a fourth vulcanizing apparatus C600, a third vulcanizing apparatus C400, a fourth vulcanizing apparatus C200,

and C, polishing the equipment C700, and performing rubber mixing, rubber filtering, tabletting and vulcanization on the air cushion layer 12 in the ink transfer medium by the air cushion layer 12 through the part of the manufacturing equipment C10 to finish the preparation method of the air cushion layer 12.

In step S1, the microspheres in an amount of 10 to 30 parts by mass, the nitrile rubber in an amount of 5 to 20 parts by mass, the nano-sized silica in an amount of 1 to 2 parts by mass, the stearic acid in an amount of 2 to 3 parts by mass, the zinc chloride in an amount of 2 to 6 parts by mass, the light calcium carbonate in an amount of 3 to 5 parts by mass, and the plasticizer TP-90B in an amount of 2 to 9 parts by mass are mixed, and specifically, for example, the mixture is kneaded in a rubber mixing facility C100 and a rubber filtering facility C200, and rubber filtering is performed.

In step S2, the plurality of raw material components, e.g., the compounded rubber component, are transferred, e.g., to a calendering apparatus C300, e.g., a three-roll calender, for sheeting for subsequent substrate assembly, e.g., calender assembly with the first substrate 11 and/or the second substrate 13. In a three-roller calender, the parameters in the pressing process are, for example, 100-; pressure of 5-20MPa, such as 5.5MPa, 8.5MPa, 10MPa, 15 MPa; the roller spacing is 0.05-1mm, e.g. 0.06mm, 0.08mm, 0.09 mm; the calendering rate is from 0.4 to 1.0m/min, for example 0.5m/min, 0.6m/min, 0.8 m/min.

In step S2, a plurality of raw material components in a sheet form having a thickness of, for example, 0.26mm, and a first base material layer 11 having a thickness of, for example, 0.29mm to 0.55mm, for example, cotton cloth having a seam of 0.08mm to 0.47mm are calendered and split in the calendering apparatus C300 and the splitting apparatus C500, and then a second base material layer 13 having a thickness of, for example, 0.29mm to 0.55mm, for example, cotton cloth having a seam of 0.06mm to 0.69mm is split, followed by vulcanization foaming in the first vulcanization apparatus C500.

In some embodiments, the first vulcanizing device C500 includes, for example, a frame C510, an unwinding assembly C520, a hot roll assembly C530, and a winding assembly C540. In the vulcanization foaming operation, the heat roller assembly C530 is mounted in the frame C510 and can rotate around the frame C510, and the heat roller assembly C530 includes a plurality of heating rollers, for example, 16 heating rollers, which have different temperatures therebetween, so as to vulcanize and foam the air cushion layer 12 in the ink transfer medium, and further draw to the take-up assembly C540 for take-up. The vulcanization parameters of the vulcanization foaming are 0-0.1kg of vulcanization pressure, 150-155 ℃ of vulcanization temperature and 3-4 minutes of vulcanization time. In a specific embodiment, wherein the vulcanization pressure is 0kg, the vulcanization temperature is for example between 150 ℃, and the vulcanization time is 3 minutes, this results in a thickness of the air cushion layer 12 of 0.40 mm.

Examples of the invention

The present invention will be described in more detail below with reference to examples and comparative examples.

To provide the air bearing layer, 8 examples and 2 comparative examples were prepared according to the parameters in table 1 below.

Table 1 structural parameters of the air cushion layer

As shown in table 2, the plurality of raw material components of the cushion layer 12 in examples 1 to 3 were mixed and tabletted by a calendaring machine C300, and the tabletted plurality of raw material components were laminated on the first substrate layer 11 and the second substrate layer 13, followed by vulcanization foaming, to obtain the cushion layer 12.

Meanwhile, as shown in table 3, the air cushion layer 12 was obtained by mixing and applying a plurality of raw material components of the air cushion layer 12 in comparative examples 1 to 2 to the first substrate layer 11 and the second substrate layer 13 by a coater, followed by vulcanization foaming.

TABLE 2 calendering and vulcanization parameters for air cushion layers

TABLE 3 coating parameters and curing parameters for ink transfer media

Evaluation of

Each evaluation item of the ink transfer media 10 prepared in examples 1 to 8 and comparative examples 1 to 2 was measured as shown in Table 3 and shown in FIG. 12.

Specifically, fig. 12 shows a microscope representation of a coating-formed ink transfer media 10 in which bleed is severe and the cells are incomplete, as compared to a calendered formed ink transfer media 10 of the present invention (fig. 5-6).

Table 4 evaluation of the air cushion layer 12

Accordingly, the present invention provides an air cushion layer 12 for an ink transfer medium, which has a fully closed microporous structure formed by microsphere capsule foaming of a vulcanized rubber composition, wherein the air cushion layer has a compression distance of 0.12-0.24mm under a load of 800-1500 Kpa; under the load of 1800 plus 2500Kpa, the compression distance is 0.20-0.24mm, so that the foaming porous material is suitable for calendering process, and has high strength, uniform pores, small deformation after being stressed and high compressibility. In addition, based on the balance between the adhesive force and the slurry seepage can be realized between the air cushion layer and the base material, the residual quantity of organic solvent of the ink transfer medium containing the air cushion layer provided by the invention is less than or equal to 0.1PPM, the product qualification rate is high, the problems of resource waste and environmental pollution are avoided, the working environment is improved, the high-speed printing with good stability, high strength and good rebound resilience is realized when the air cushion layer is used, the printing speed can reach 1.5 million prints, and the air cushion layer can be widely applied to industrial production.

While the invention has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that the foregoing and other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention. Those skilled in the art can make various changes, modifications and equivalent arrangements, which are equivalent to the embodiments of the present invention, without departing from the spirit and scope of the present invention, and which may be made by utilizing the techniques disclosed above; meanwhile, any changes, modifications and variations of the above-described embodiments, which are equivalent to those of the technical spirit of the present invention, are within the scope of the technical solution of the present invention.

Claims

1. An air cushion layer for an ink transfer medium, which is characterized in that the air cushion layer has a fully-closed micropore structure formed by a microsphere capsule foaming vulcanized rubber component, and the air cushion layer has a compression distance of 0.12-0.24mm under the load of 800-1500 Kpa; the compression distance is 0.20-0.24mm under the load of 1800-2500 Kpa.

2. The air bearing layer for an ink transfer media of claim 1 wherein said rubber component comprises nitrile rubber.

3. The air bearing layer for an ink transfer medium of claim 1 wherein said microsphere capsules are polyurethane microspheres having a diameter of 0.01 to 1.5 μm.

4. The air bearing layer for an ink transfer media of claim 1 wherein said fully closed pores have a pore size of 1 to 100 μm.

5. The air bearing layer for an ink transfer medium of claim 1, wherein the air bearing layer has a thickness of 0.3 to 0.6mm and is vibrated up and down 6.5 to 10 times per second.

6. The ink transfer medium according to claim 1, wherein the fully closed cell structure is obtained by foaming and vulcanizing in an environment of 0 to 0.1 kg.

7. A preparation method of an air cushion layer for an ink transfer medium is characterized by comprising the following steps:

providing a plurality of feedstock components, the feedstock components comprising: microsphere capsules and a rubber component;

foaming and vulcanizing a plurality of raw material components to obtain the air cushion layer, wherein the compression distance of the air cushion layer is 0.12-0.24mm under the load of 800-1500 Kpa; the compression distance is 0.20-0.24mm under the load of 1800-2500 Kpa.

8. The method of making an air cushion layer for an ink transfer media of claim 6 wherein the temperature of the foam curing includes a plurality of different temperature intervals.

9. The method of manufacturing an air bearing layer for an ink transfer medium according to claim 6, wherein the step of vulcanizing the air bearing layer comprises vulcanizing in an environment of 0 to 0.1 kg.

10. An ink transfer media, comprising,

a first base material layer;

the air cushion layer is positioned on the first base material layer;

the second substrate layer is positioned on the air cushion layer;

the surface adhesive layer is positioned on the second base material layer;

wherein the air cushion layer is of a fully-closed micropore structure formed by microsphere capsule foaming vulcanized rubber components, and the compression distance of the air cushion layer is 0.12-0.24mm under the load of 800-1500 Kpa; the compression distance is 0.20-0.24mm under the load of 1800-2500 Kpa.