阅读说明：本技术 一种激光蚀刻凹印制版工艺 (Laser etching gravure plate making process ) 是由 李秉潮 于 2020-06-02 设计创作，主要内容包括：本发明涉及制版工艺技术领域,特别涉及一种激光蚀刻凹印制版工艺。仅需要对辊体喷涂一层激光胶,通过多次激光蚀刻形成最终网穴,且最终形成的网穴由外至内深度逐渐加深的V型网穴,通过该种工艺可制作处深度深且穴型佳的版辊,对于颗粒大、粘性大、流平性相对较差反光型材料油墨具有极佳的适用性,制成的版辊印刷效果佳。(The invention relates to the technical field of plate making processes, in particular to a laser etching gravure plate making process. The process can be used for manufacturing the roller with deep depth and good hole type, has excellent applicability to reflective material ink with large particles, high viscosity and relatively poor leveling property, and has good printing effect.)

1. A laser etching gravure plate making process is characterized in that: the method comprises the following steps:

step one, uniformly spraying a laser adhesive layer on the outer surface of a roller body;

step two, removing part of the laser glue in a point shape according to the pattern to be printed by a laser engraving machine, forming a plurality of meshes exposed out of the roller body on the laser glue layer, taking the meshes corresponding to the finally formed mesh holes as S,

firstly, the area of a mesh A1 formed by laser engraving is smaller than that of the mesh S, and A1 is positioned at the center of the mesh S; putting the roller body into corrosive liquid for corrosion to form a mesh, then taking out the roller body, and cleaning and drying the residual corrosive liquid;

secondly, performing laser engraving to expand the outer edge of the mesh to form a mesh An, wherein the area of the mesh An is larger than that of A (n-1), and the mesh An is positioned at the center of S; putting the roller body into corrosive liquid to corrode and expand the mesh, then taking out the roller body, and cleaning and drying the residual corrosive liquid;

repeating the step two until An expands to be completely superposed with S; a1 is a mesh formed by first laser engraving, An is a mesh formed by nth laser engraving, and n is a natural number greater than or equal to 2.

And step three, degumming and cleaning the roller body.

2. The laser-etching gravure process of claim 1, wherein: in the first step, copper is plated on the roller body, then polishing is carried out, and then the laser glue layer with the thickness of 10-20um is formed through multiple spraying.

3. The laser-etching gravure process of claim 1, wherein: carrying out three times of laser engraving, wherein the area of the mesh A1 formed by the first time of laser engraving is 20-40% of the area of the S; the area of the mesh A2 formed by the second laser engraving is 50% -70% of the area of the mesh S; the third laser engraving forms the mesh S.

4. The laser-etching gravure process of claim 1, wherein: the etching time after each laser engraving is gradually decreased.

5. The laser-etching gravure process according to claim 1 or 4, wherein: carrying out laser engraving for three times, and after the laser engraving for the first time, putting the roller body into corrosive liquid for 700s corrosion; after the second laser engraving, the roller body is put into corrosive liquid for 600s corrosion; and after the third laser engraving, putting the roller body into corrosive liquid for 300s corrosion.

6. The laser-etching gravure process of claim 1, wherein: and step four, after degumming and cleaning, putting the roller body into a copper chloride solution for positive and negative rotary etching to carry out a chemical naked etching process.

7. The laser-etching gravure process according to claim 6 or 7, wherein: and in the fourth step, performing surface chromium plating treatment on the roller body.

8. The laser-etching gravure process of claim 1, wherein: the residual corrosive liquid is specifically that the roller body is put into a mixed liquid of dilute hydrochloric acid and copper chloride for cleaning, and then air blowing and drying are carried out.

9. The laser-etching gravure process of claim 1, wherein: the corrosive liquid is ferric chloride solution.

Technical Field

The invention relates to the technical field of plate making processes, in particular to a laser etching gravure plate making process.

Background

The laser etching plate-making process includes coating one layer of laser glue on the surface of the roller body, ablating part of the laser glue with a laser carving machine according to the pattern to be printed to expose corresponding part of the roller body, and corroding the roller body with corrosive liquid to form netted holes in the same size as the pattern to be printed.

Compared with the common printing ink, the reflective material printing ink has large particles, large viscosity and relatively poor leveling property, and the reflective material printing requires thick ink layers and uniform leveling property, so that a better reflective effect can be achieved. Therefore, a mesh which is deep and is beneficial to leveling is needed on the plate roller; generally, the mode of increasing the depth of the mesh holes by the laser etching process is to increase the corrosion time of the roller body by the corrosive liquid; although the depth of the mesh points can be increased by increasing the corrosion time, the side edges of the mesh points are corroded by the corrosion liquid while the depth of the mesh points is increased, so that the mesh points expand outwards, and under the condition that the mesh points do not reach the required corrosion depth, the outward expansion degree of the mesh points is too large, the printing effect of the manufactured printing roller is sharply reduced, and the printing roller cannot be used. Therefore, the maximum mesh point which can be formed by the existing laser etching process cannot be applied to special printing ink such as reflective material printing ink.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a laser etching gravure plate making process for manufacturing a plate roller with deep depth and good hole shape.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a laser etching gravure plate making process is characterized in that: the method comprises the following steps:

step one, uniformly spraying a laser adhesive layer on the outer surface of a roller body;

step two, removing part of the laser glue in a point shape according to the pattern to be printed by a laser engraving machine, forming a plurality of meshes exposed out of the roller body on the laser glue layer, taking the meshes corresponding to the finally formed mesh holes as S,

firstly, the area of a mesh A1 formed by laser engraving is smaller than that of the mesh S, and A1 is positioned at the center of the mesh S; putting the roller body into corrosive liquid for corrosion to form a mesh, then taking out the roller body, and cleaning and drying the residual corrosive liquid;

secondly, performing laser engraving to expand the outer edge of the mesh to form a mesh An, wherein the area of the mesh An is larger than that of A (n-1), and the mesh An is positioned at the center of S; putting the roller body into corrosive liquid to corrode and expand the mesh, then taking out the roller body, and cleaning and drying the residual corrosive liquid;

repeating the step two until An expands to be completely superposed with S; a1 is a mesh formed by first laser engraving, An is a mesh formed by nth laser engraving, and n is a natural number greater than or equal to 2.

And step three, degumming and cleaning the roller body.

Further, in the first step, copper is plated on the roller body, then polishing is carried out, and then the laser glue layer with the thickness of 10-20um is formed through multiple spraying.

Further, carrying out three times of laser engraving, wherein the area of the mesh A1 formed by the first time of laser engraving is 20-40% of the area of the mesh S; the area of the mesh A2 formed by the second laser engraving is 50% -70% of the area of the mesh S; the third laser engraving forms the mesh S.

Further, the etching time performed after each laser engraving is gradually decreased.

Further, carrying out three times of laser engraving, and after the first time of laser engraving, putting the roller body into corrosive liquid for 700s of corrosion; after the second laser engraving, the roller body is put into corrosive liquid for 600s corrosion; and after the third laser engraving, putting the roller body into corrosive liquid for 300s corrosion.

And further, after degumming and cleaning in the fourth step, putting the roller body into a copper chloride solution for positive and negative rotation etching to carry out a chemical naked etching process.

And further, in the fourth step, performing surface chromium plating treatment on the roller body.

Further, the residual corrosive liquid is specifically that the roller body is put into a mixed solution of dilute hydrochloric acid and copper chloride for cleaning, and then air blowing and drying are carried out.

Further, the corrosive liquid is ferric chloride solution.

From the above description of the present invention, it can be seen that, compared with the prior art, the laser etching gravure plate making process provided by the present invention only needs to spray a layer of laser glue layer on the roller body, the final mesh opening is formed by multiple laser etching, and the finally formed V-shaped mesh opening gradually deepens from outside to inside, and by the process, the plate roller with deep depth and good opening can be manufactured, and the present invention has excellent applicability to reflective material ink with large particles, large viscosity and relatively poor leveling property, and the manufactured plate roller has good printing effect.

Drawings

FIG. 1 is a schematic diagram of a three-shot laser etching process of a mesh according to the present invention.

FIG. 2 is a second schematic view of triple laser etching of a cell according to the present invention.

FIG. 3 is a schematic view of a partial cross-sectional structure of a roll body in a first laser engraving state according to the present invention.

FIG. 4 is a schematic view of a partial cross-sectional structure of a roll body in a second laser engraving state according to the present invention.

Fig. 5 is a schematic view of a partial cross-sectional structure of the roller body in a third laser engraving state according to the present invention.

The labels in the figure correspond to the following: 1. the method comprises the steps of (1) forming meshes through first laser engraving, (2) forming the laser glue layer, (3) forming the meshes through mesh holes, (A1) forming the meshes through second laser engraving, (A2) forming the meshes through second laser engraving, (A3) forming the meshes through third laser engraving, and (S) finally forming the meshes corresponding to the mesh holes.

Detailed Description

The invention is further described below by means of specific embodiments.

Referring to fig. 1 to 5, a laser etching gravure process includes the following steps:

step one, copper is plated on a roller body 1, then polishing is carried out, and then a laser glue layer 2 with the thickness of 10-20um is uniformly formed on the outer surface of the roller body 1 through multiple spraying;

secondly, removing part of the laser glue in a point-like manner according to the pattern to be printed by a laser engraving machine, forming a plurality of irregularly-shaped meshes exposed out of the roller body on the laser glue layer 2, taking the mesh corresponding to the finally formed mesh 3 as S,

firstly, carrying out laser engraving for the first time to form a mesh A1, wherein the area of A1 is 30% of the area of S, and A1 is in the center of S; the roller body 1 is put into corrosive liquid to be corroded for 700 seconds to form a mesh 3, and then the roller body is taken out to be cleaned by residual corrosive liquid and dried by blowing;

secondly, performing laser engraving, wherein the outer edge of the mesh is expanded by the laser engraving to form a mesh A2, the area of A1 is 60% of the area of S, and A2 is located at the center of S; the roller body 1 is put into corrosive liquid for 600s corrosion to expand the mesh 3, and then taken out for cleaning by residual corrosive liquid and blowing and drying;

thirdly, laser engraving, wherein the outer edge of the mesh is expanded to form a mesh S through the laser engraving; putting the roller body into corrosive liquid for 300s corrosion to expand the mesh 3;

and step three, degumming and cleaning the roller body 1, putting the roller body 1 into a copper chloride solution, positively rotating for 60s, reversely rotating for 60s, etching for chemical naked etching, and then performing surface chromium plating treatment on the roller body 1.

Wherein, the residual corrosive liquid is specifically that the roller body 1 is put into a mixed solution of dilute hydrochloric acid and copper chloride for cleaning, and then air blowing and drying are carried out; the corrosive liquid is ferric chloride solution.

The principle of the laser etching gravure plate making process is as follows:

only one layer of laser glue layer 2 needs to be sprayed on the roller body 1, the final mesh 3 is formed through multiple times of laser etching, and as the mesh formed by each time of laser engraving is outwards expanded relative to the mesh formed by the previous time of laser engraving, the mesh 3 formed by each time of corrosion on the roller body 1 is gradually expanded from inside to outside, and the later time of corrosion can carry out secondary corrosion on the internal part while corroding the expanded part, therefore, the finally formed mesh 3 is gradually deepened from outside to inside, namely the V-shaped mesh 3 is formed.

The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.