WO2017036254A1

WO2017036254A1 - Printing plate for opposite intaglio printing process and manufacturing method therefor

Info

Publication number: WO2017036254A1
Application number: PCT/CN2016/090266
Authority: WO
Inventors: 李群力; 马立项; 吴金平; 刘坤
Original assignee: 南京造币有限公司; 中国印钞造币总公司
Priority date: 2015-08-28
Filing date: 2016-07-18
Publication date: 2017-03-09
Also published as: CN105216473A; CN105216473B

Abstract

Disclosed are a printing plate for an opposite intaglio printing process and a manufacturing method therefor. The printing plate for the opposite intaglio printing process is installed on a transfer printing or impression cylinder. The printing plate comprises a surface layer (1) and a bottom plate (2). The surface layer (1) comprises a first flexible film layer (11) and a second flexible film layer (12). The first flexible film layer (11), the second flexible film layer (12) and the bottom plate (2) are thermally laminated into a whole from top to bottom. The printing plate for the opposite intaglio printing process can prolong the service life of the printing materials for the opposite intaglio printing process, and accordingly the production efficiency of the opposite intaglio printing process is improved, and the printing cost is saved.

Description

Printing plate for gravure printing corresponding process and preparation method thereof

Technical field

The invention relates to the printing consumables and the field of manufacture thereof, in particular to a printing plate for a gravure printing process and a preparation method thereof.

Background technique

The gravure printing process is a process technology that uses front gravure and back indirect gravure to accurately print, and has different performance requirements for printing materials that also serve as imprint materials: materials with better elasticity or lower hardness are favorable for front concave Printing, but the indirect gravure effect on the back side is poor; on the contrary, if the material with poor elasticity or high hardness is favorable for the transfer of the back graphic. Chinese patent applications CN02123770.0 and CN1465482A describe the gravure printing process and printing equipment.

The embossing material used on the impression cylinder of a common engraving gravure printing machine is usually a blanket, and the underlay is a fiber material, such as for gravure printing, which will expand and contract under high-intensity pressure, and the printing pattern thereon is mounted thereon. Displacement and deformation will occur during embossing, affecting the print quality and printing effect of the other side pattern.

At present, the materials used for gravure printing are not specially developed, so the service life of the materials is not satisfactory, which affects the further application of the gravure printing process.

Summary of the invention

In order to overcome the deficiencies of the prior art, one of the objects of the present invention is to provide a printing plate for a gravure printing process to improve the service life of the printing material of the gravure printing process, thereby improving the gravure printing process. Production efficiency and saving printing costs.

Another object of the present invention is to provide a method for preparing a printing plate for a gravure printing process, by which a printing plate having a long service life and meeting the requirements of the gravure printing process can be obtained.

In order to achieve one of the objects of the present invention, the scheme adopted by the present invention is as follows:

A printing plate for a gravure printing process, mounted on a transfer or impression cylinder, the printing plate comprising a top layer and a bottom plate, the surface layer comprising a first flexible film layer and a second flexible film layer, The first flexible film layer, the second flexible film layer and the bottom plate are integrally bonded from top to bottom.

Further, the material of the first flexible film layer of the present invention is one of nylon, PVC, PET, polyurethane, polyester materials or a composite material of two or more materials; the material of the second flexible film layer It is one of nylon, PVC, PET, polyurethane, polyester materials or a composite material of two or more materials; wherein the first flexible film layer and the second flexible film layer do not use one material at the same time.

Further, the printing plate of the present invention has a total thickness of 0.6 mm to 0.9 mm and a hardness of 90 or more.

Further, the total thickness of the top layer of the present invention is 0.3 mm or more.

Further, the first flexible film layer of the present invention has a Shore hardness of 90 degrees or more; and the second flexible film layer has a lower hardness than the first flexible film layer.

Further, the bottom plate of the present invention is a hard metal plate.

Further, the hard metal plate of the present invention is a tinplate or a stainless steel plate.

A method for preparing a printing plate for a gravure printing process, comprising the steps of:

1) adding, in the elastic material, a processing aid of 2 to 8% of the total weight of the flexible material, and heating and pulling to form a coil as the first flexible film layer;

2) using an elastic material as a raw material, adding an auxiliary agent to adjust the hardness, and forming a coil as a second flexible film layer;

3) combining the first flexible film layer and the second flexible film layer together by heat bonding to obtain a surface layer;

4) The above-mentioned composite top layer material is bonded to the bottom plate to obtain a finished product of the printed material.

The elastic material in the step 1) is one or more of nylon, PVC, PET, polyurethane, polyester; the elastic material described in the step 2 is nylon, PVC, PET, polyurethane, polyester. One or two or more kinds of mixing; the same material is used when the elastic material in the step 1) is different from the elastic material in the step 2).

Compared with the prior art, the beneficial effects of the present invention are:

1. The printing plate of the invention has the multi-layer structure of the surface layer, and can meet the requirement of the printing durability of the gravure printing process;

2. The printing plate used in the invention does not need to be exposed before use, thereby improving production efficiency;

3. The printing plate for gravure printing process according to the present invention can improve the service life of the printing material of the gravure printing process, thereby improving the production efficiency of the gravure printing process and saving printing cost;

4. The preparation method of the invention is simple and easy to operate, and is convenient for popularization and application.

DRAWINGS

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments;

1 is a schematic structural view of Embodiment 1 of a printing plate for a gravure printing process according to the present invention;

2 is a schematic structural view of Embodiment 2 of a printing plate for a gravure printing process according to the present invention;

2 is a schematic structural view of Embodiment 3 of a printing plate for a gravure printing process according to the present invention;

Wherein, each reference numeral is: 1, a surface layer; 11, a first flexible film layer; 12, a second flexible film layer; 13. a film layer; 14. a third flexible film layer; 15. a fourth flexible film layer; 2. a bottom plate.

detailed description

The printing plate for the gravure printing process of the present invention is mounted on a transfer or impression cylinder, the printing plate comprising a top layer 1 and a bottom plate 2, the surface layer 1 comprising a first flexible film layer 11 and The second flexible film layer 12, the first flexible film layer 11, the second flexible film layer 12 and the bottom plate 2 are integrally bonded from top to bottom. In the present invention, the printing plate includes not only the three layers of materials, but also the film layer 13 on the upper surface of the first flexible film layer 11 on the basis of the three layers of materials; Further on the basis of the solution of 13, the face layer 1 further comprises a third flexible film layer 14 between the second flexible film layer 12 and the bottom plate 2.

Further, the material of the first flexible film layer 11 of the present invention is one of nylon, PVC, PET, polyurethane, polyester materials or a composite material of two or more materials; the second flexible film layer 12 The material is one of nylon, PVC, PET, polyurethane, polyester materials or a composite material of two or more materials. In the present invention, the first flexible film layer 11 may be one of the above materials, or may be one of the above materials or a mixture of two or more kinds and added with an auxiliary agent, and then thermally stretched into a layer. Similarly, the second flexible film layer 12 may be one of the above materials, or may be one of the above materials or a mixture of two or more kinds and added with an auxiliary agent, and then thermally stretched into a layer. However, in a specific solution, in order to further improve the printing durability of the gravure, the first flexible film layer 11 and the second flexible film layer 12 do not use one material at the same time. For example, when the first flexible film layer is made of PVC, the second flexible film layer 12 is made of other materials than PVC to ensure that the surface layer is a layered structure of two different materials. Further, the above-mentioned film layer 13 is a transparent film layer, and an elastic material such as PP, PE, PVC or the like can be selected. When the third flexible film layer 14 is included in the solution, the hardness of the third flexible film layer 14 should be greater than that of the first flexible film layer 11 and The hardness of the second flexible film layer 12.

The printing plate has a total thickness of 0.6 mm to 0.9 mm and a hardness of 90 or more.

In order to further reduce the wear rate (also referred to as the printing durability), it can be achieved by controlling the thickness of the surface layer, and the total thickness of the top layer 1 of the present invention is 0.3 mm or more.

Further, the first flexible film 11 layer of the present invention has a printing durability of 80% or more.

The main factors affecting the gravure wear are surface friction, the quality of the intaglio, the pressure of the doctor blade, the pressure of the impression cylinder, the linear velocity of the impression cylinder, the quality of the ink and the paper, etc.; in the present invention, the inventors have found If the hardness of the surface layer material is also improved to reduce the wear and increase the printing durability, the first flexible film layer 11 of the present invention has a Shore hardness of 90 degrees or more in order to achieve the printing durability; the second flexible film Layer 12 has a lower hardness than the first flexible film layer (11). Further, when the hardness of the two layers of the first flexible film layer 11 and the second flexible film layer 12 are not equal, especially when the hardness of the first flexible film layer 11 is less than the hardness of the second flexible film layer 12, the printing durability Can be further improved. The materials of the first flexible film layer 11 or the second flexible film layer 12 may specifically have a Shore hardness of 91 degrees, 92 degrees, 95 degrees, 96 degrees, 97 degrees, 98 degrees, 99 degrees, 100 degrees, 101 degrees, 105. One of degrees, 110 degrees, and 120 degrees.

Further, the inventors have found that the thickness and material of the bottom plate 2 are also one of the factors affecting the wear rate. It has been found that when the bottom plate 2 is a hard metal plate having a thickness of 0.3 mm to 0.5 mm, the wear rate of the printed board can be further reduced. The specific thickness can be selected between 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, and 0.5 mm.

Further, the hard metal plate of the present invention is a tinplate or a stainless steel plate. In the present invention, the hard metal plate is not limited to the above two types of plates, and may be other metals having a Shore hardness of 90 degrees or more. For example, the Shore hardness of the metal sheet may be 91 degrees, 92 degrees, 95 degrees, 96 degrees, 97 degrees, 98 degrees, 99 degrees, 100 degrees, 101 degrees, 105 degrees, 110 degrees, 120 degrees.

1) adding a processing aid to the elastic material in an amount of 2-8% by weight of the total weight of the elastic material, heating and pulling to form a coil material, as the first flexible film layer 11;

2) using an elastic material as a raw material, adding an auxiliary agent to adjust the hardness, and forming a coil as the second flexible film layer 12;

3) The first flexible film layer 11 and the second flexible film layer 12 are combined by heat bonding to obtain a surface layer 1;

4) The above-mentioned composite surface layer 1 material is bonded to the metal base plate to obtain a finished product of the printed material.

The elastic material of step 1) is one or more materials of nylon, PVC, PET, polyurethane, polyester materials; the elastic material of step 2) is nylon, PVC, PET, polyurethane, poly One or more materials of the materials in the ester are mixed; when the elastic material in the step 1) is different from the elastic material in the step 2), the same material is used.

In the above method, the processing aid in the specific step 1) is one of a plasticizer, a nucleating agent and an antioxidant; and the auxiliary agent in the step 2) is a nucleating agent or a plasticizer. The hardness of the material is controlled in step 2) by the addition of a nucleating agent or a plasticizer; preferably a nucleating agent, the nucleating agent is added in an amount of from 2 to 5% by weight of the elastomeric material. Because the nucleating agent can accelerate the crystallization rate, increase the crystal density and promote the grain size refinement, and achieve the purpose of improving the transparency, surface gloss and material hardness of the product, the amount of the nucleating agent can be controlled to achieve the purpose of controlling the hardness of the material.

The method for using the transfer plate for gravure printing process according to the present invention is as follows: the transfer material is mounted on On the transfer/imprint cylinder, when the area of the gravure plate on the plate cylinder corresponding to the transfer material has no substrate and is in contact with the plate cylinder, the pattern is transferred to the transfer plate of the transfer/imprint cylinder In the upper part, when the substrate enters the embossing area with the transfer/imprinting cylinder, the printing plate presses the pattern of the printing plate to one side of the printing substrate, and the transfer/imprinting roller The pattern on the substrate is transferred to the other side of the substrate to complete simultaneous printing on both sides of the substrate.

The following are specific examples of the invention, which may be obtained by purchase in addition to the sources of the specifically defined materials in the following examples.

Example 1

As shown in FIG. 1, the printing plate for the gravure printing process of the present invention is mounted on a transfer or impression cylinder, the printing plate comprising a top layer 1 and a bottom plate 2, the surface layer 1 comprising a flexible film layer 11 and a second flexible film layer 12, the first flexible film layer 11, the second flexible film layer 12 and the bottom plate 2 are heat-bonded from top to bottom;

The printing plate for the gravure printing process is prepared by the following method:

1) Adding 2% of the total weight of the plasticizer to the PVC, heating to 100 ° C, pulling up to make a roll with a Shore hardness of 91 degrees, as the first flexible film layer 11;

2) using PET as a raw material, adding a nucleating agent of 2% by weight of the PET to adjust the Shore hardness to 95 degrees to form a coil as the second flexible film layer 12;

3) The first flexible film layer 11 and the second flexible film layer 12 are thermally bonded together to obtain a surface layer 1;

4) The above-mentioned composite surface layer material is bonded to the stainless steel plate bottom plate to obtain a finished product of the printed material.

The printing plate of the invention is used on a gravure printing machine to test its printing durability (note: the printing durability is reflected by the wear rate), and the test has passed the inspection of 24,000 sheets of 1.2×1.2 m printed products, and no occurrence has occurred. Significant damage, no peeling of the multilayer structure, the printed ink can be better transferred.

Example 2

As shown in FIG. 2, the printing plate for the gravure printing process of the present invention is mounted on a transfer or impression cylinder, the printing plate comprising a top layer 1 and a bottom plate 2, the surface layer 1 comprising a flexible film layer 11 and a second flexible film layer 12, the first flexible film layer 11, the second flexible film layer 12 and the bottom plate 2 are heat-bonded from top to bottom; the printing plate further includes a surface on the surface layer Transparent PE film layer 13;

1) Adding a plasticizer to the PVC in an amount of 8% by weight of the total weight of the PVC, heating to 100 ° C, pulling up to make a roll with a Shore hardness of 92, as the first flexible film layer 11;

2) using PET as a raw material, adding a nucleating agent of 5% by weight of the PET to adjust the Shore hardness to 96 degrees to form a coil as the second flexible film layer 12;

4) thermally laminating a transparent PE film layer 13 having a thickness of 0.01-0.05 mm on the surface of the surface layer 1 to obtain a composite surface layer;

5) The composite surface layer and the stainless steel base plate are bonded together to obtain a finished product of the printed material.

The printing plate of the invention is used on a gravure printing machine to test its printing durability (Note: the printing durability is reflected by the wear rate), and the test has passed 45,000 sheets of 1.2×1.2 m printing products, and no occurrence has occurred. Significant damage, no peeling of the multilayer structure, the printed ink can be better transferred.

Example 3

As shown in FIG. 3, the printing plate for the gravure printing process of the present invention is mounted on a transfer or impression cylinder, the printing plate comprising a top layer 1 and a bottom plate 2, the surface layer 1 comprising a flexible film layer 11 and a second flexible film layer 12, the first flexible film layer 11, and a third flexible film layer 14 and a fourth flexible film layer 15 between the second flexible film layer 12 and the bottom plate 2;

1) Adding a plasticizer to the PVC in an amount of 5% by weight of the total weight of the PVC, heating to 120 ° C, pulling up to make a roll with a Shore hardness of 91 degrees, as the first flexible film layer 11;

2) using polyurethane as a raw material, adding a nucleating agent of 2% by weight of the polyurethane to adjust the Shore hardness to 91 degrees to form a coil as the second flexible film layer 12;

3) using nylon as a raw material to add a nucleating agent of 3% by weight of the nylon to adjust the Shore hardness to 94 degrees, to form a coil, as the third flexible film layer 14;

4) using PET as a raw material, adding a nucleating agent of 3% by weight of the PET to adjust the Shore hardness to 96 degrees, and forming a coil as the fourth flexible film layer 15;

5) The first flexible film layer 11, the second flexible film layer 12, the third flexible film layer 14, the fourth flexible film layer 15 from the top to the bottom are sequentially heat-bonded together to obtain the surface layer 1;

4) The upper layer 1 and the stainless steel bottom plate are bonded together to obtain a finished product of the printed material.

The printing plate obtained in this embodiment is used on a gravure printing machine. After inspection of a printing material of 106,000 sheets, the surface layer of the transfer material of the structure is not obviously damaged, but the metal plate is broken, and more There is no peeling phenomenon in the layer structure, and the improved surface layer material ink can be better transferred. The specific expression is that the ink has less residue on the surface of the material, and the line is clearer than the existing transfer material.

The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the protection of the present invention. Scope, any insubstantial variations and substitutions made by those skilled in the art based on the present invention are within the scope of the invention as claimed.

Claims

A printing plate for a gravure printing process, mounted on a transfer or impression cylinder, characterized in that the printing plate comprises a facing layer (1) and a bottom plate (2), the facing layer (1) comprising a first flexible film layer (11) and a second flexible film layer (12), the first flexible film layer (11), the second flexible film layer (12) and the bottom plate (2) are integrated from top to bottom .
The printing plate for gravure printing process according to claim 1, wherein the material of the first flexible film layer (11) is one of nylon, PVC, PET, polyurethane, polyester materials. Or a composite material of two or more materials; the material of the second flexible film layer (12) is one of nylon, PVC, PET, polyurethane, polyester materials or a composite of two or more materials The composite material; wherein the first flexible film layer (11) and the second flexible film layer (12) do not use a material at the same time.
A printing plate for a gravure printing process according to claim 1, wherein the printing plate has a total thickness of from 0.6 mm to 0.9 mm, and the printing plate has an average Shore hardness of 90 or more.
The printing plate for a gravure printing process according to claim 1, wherein the first flexible film layer (11) has a Shore hardness of 90 degrees or more; and the second flexible film layer (12) The hardness is lower than the first flexible film layer (11).
A printing plate for a gravure printing process according to claim 1, characterized in that the bottom plate (2) is a hard metal plate.
A printing plate for a gravure printing process according to claim 5, wherein the hard metal plate is a tinplate or a stainless steel plate.
A printing plate for a gravure printing process according to claim 1, characterized in that the total thickness of the top layer (1) is 0.3 mm or more.
A method of preparing a printing plate for a gravure printing process according to claim 1, comprising the steps of:

1) adding a processing aid of 2-8% of the total weight of the elastic material to the elastic material, and heating and pulling to form a coil as the first flexible film layer;

2) using an elastic material as a raw material, adding an auxiliary agent to adjust the hardness, and forming a coil as a second flexible film layer;

3) combining the first flexible film layer and the second flexible film layer together by heat bonding to obtain a surface layer;

4) The above-mentioned composite surface layer material is bonded to the bottom plate to obtain a finished product of the printing plate.
The preparation method according to claim 8, wherein the elastic material in the step 1) is a composite material of one or more of nylon, PVC, PET, polyurethane, polyester materials; step 2 The elastic material is a composite material of one or more of nylon, PVC, PET, polyurethane, polyester materials; the elastic material in step 1) is the same as the elastic material in step 2) Materials.
The preparation method according to claim 8, wherein the auxiliary agent is added in the amount of 2-5% by weight of the elastic material in the step 2).