CN102602126A

CN102602126A - Method for engraving gravure roller

Info

Publication number: CN102602126A
Application number: CN2012100892584A
Authority: CN
Inventors: 张伟强; 林灿升; 陈垒
Original assignee: SHANTOU LICHENG PRINT PLATEMAKING CO Ltd
Current assignee: Shantou Licheng Printing Industry Co., Ltd.
Priority date: 2012-03-29
Filing date: 2012-03-29
Publication date: 2012-07-25
Anticipated expiration: 2032-03-29
Also published as: CN102602126B

Abstract

A method for engraving a gravure roller comprises the following steps that: (1) a design pattern is processed in order to be consistent with a target pattern; (2) the height of the design pattern is stretched to be N times that of the target pattern, where N=1.1 to 1.5; (3) the circumferential size of a voucher file is set to be N times that of a version roller according to the height value of the design pattern stretched in step (2) to manufacture the voucher file; and (4) the voucher file is transmitted to an electronic engraving machine; and the electronic engraving machine firstly performs screening according to the circumferential size of the voucher file and then compresses and engraves the stretched design pattern along the circumference direction to the cylindrical surface of the version roller in an automatic seamless connection way to obtain the gravure roller, wherein the compression ratio is 1/N. The product printed by the gravure roller manufactured by the method can meet the requirements on both the clarity and ink content of the printed pattern.

Description

The engraving process of gravure printing roller

Technical field

The present invention relates to the manufacturing process of galley, specifically, relate to the engraving process of gravure printing roller.

Background technology

Intaglio printing is a kind of typography commonly used at present; Its print product have black bed thickness real, bright in luster bright, can true reappearance original copy effect etc. advantage; And can adopt water color ink and alcohol-soluble printing ink etc. comparatively the printing ink of environmental protection print multiple stocks such as suit plastic sheeting, paper, composite.

The manufacture craft of gravure printing roller is main with electronic engraving; Existing engraving process generally comprises following step: (1) is by the requirement of plate-making certificate of entrustment; Layout is handled (as cutting); Make layout and target pattern (target pattern is meant the pattern that finally is printed on the print product, comprises image, literal etc.) consistent size; (2) make the subpoena file according to the layout that obtains after step (1) processing, the circumferential size of subpoena file is consistent with the circumferential size of version roll body; The version roll body is generally cylindric steel pipe, and its surface is coated with the uniform layer of copper layer of thickness, and the copper layer is the working face of electronic engraving; (3) the subpoena file is sent to electronic engraving machine, electronic engraving machine is carved layout on the face of cylinder of version roll body with automatic seamless connected mode (seamless link is meant that the top edge of subpoena file overlaps on the version roll body with lower limb).In the step (3), electronic engraving machine forms engraving control signal according to the subpoena file, drives the graver motion, and graver incision copper layer is carved out corresponding ink cell on the copper layer; In the engraving process, the rotation of version roll body, graver vibration (vibration frequency is generally per second thousands of times), the engraving of an ink cell is once just accomplished in the every vibration of graver usually; The depth of layout color is different; Then the intensity of engraving control signal is different, and the big or small just difference of driving force that graver is suffered makes the degree of depth of graver incision copper layer change with the layout shade; Thereby layout is copied on the copper layer, form corresponding gravure printing roller.Usually also plate one deck chromium layer at the copper laminar surface after accomplishing engraving, the gravure printing roller pressrun of made is high, and the scope of application is wide.

But when running into the less pattern of lines, according to the gravure printing roller that existing engraving process is made, be difficult to guarantee final print product definition with contain China ink and all can satisfy customer requirement aspect measuring two.Carve than fine-structure mesh line (its density is higher) if adopt, final print product has sufficiently high definition, but it is low to contain the China ink amount, and the China ink layer is thin, and color is bright-coloured inadequately.Carve than coarse net line (its density is lower) if adopt, final print product has the sufficiently high China ink amount that contains, and is bright in luster, but definition is lower.That is to say, make gravure printing roller according to existing engraving process, be difficult to make gravure printing roller can take into account final print product definition with contain China ink and measure the requirement aspect two.

Summary of the invention

Technical problem to be solved by this invention provides a kind of engraving process of gravure printing roller, adopts the print product of the gravure printing roller printing that this engraving process makes, can take into account printed pattern definition with contain China ink and measure the requirement aspect two.The technical scheme that adopts is following:

A kind of engraving process of gravure printing roller is characterized in that comprising the steps:

(1) by the requirement of plate-making certificate of entrustment, layout is handled (as cutting), make layout and target pattern consistent size;

Target pattern is meant the pattern that finally is printed on the print product; Above-mentioned layout designs according to the target pattern of required printing, and layout is preferably the tiff figure that resolution ratio is not less than 600dpi; The size of layout after treatment is exactly the size that requires above the plate-making certificate of entrustment; Pattern dimension comprises the width and the height of pattern, and wherein the width of pattern is the size of pattern on the version roll body is axial, and the height of pattern is the size of pattern on version roll body circumferencial direction;

The height of the layout that (2) obtains after step (1) is handled stretches, the height of the back layout that stretches be target pattern N doubly, N=1.1-1.5 wherein;

Preferred N=1.2;

(3) set the circumferential size of subpoena file according to the stretch height number of back layout of step (2), make the subpoena file, the circumferential size of the subpoena file of made be N times of circumferential size of version roll body;

(4) the subpoena file is sent to electronic engraving machine; Electronic engraving machine carries out screening according to the circumferential size of subpoena file earlier, again with the automatic seamless connected mode, the back layout that stretches is along the circumferential direction compressed on the face of cylinder of carving the version roll body, and its compression ratio is 1/N, obtains gravure printing roller.

Suppose and adopt same electronic engraving machine same layout of engraving on same version roll body that adopt when having engraving process now, the vibration frequency of graver is the benchmark vibration frequency; The rotary speed of version roll body is the benchmark rotary speed; So, in the above-mentioned steps (4), the compression of pattern engraving can adopt following manner to realize: in the process that electronic engraving machine is carved; The vibration frequency of graver equals the benchmark vibration frequency, and the rotary speed of version roll body then is the 1/N of benchmark rotary speed.

The circumferential size of subpoena file has determined the site number on the layout circumferencial direction, in the step (4), through screening, makes the site number on the layout circumferencial direction increase to N doubly (being that the site number is N times that adopts when having engraving process now); To stretch behind the layout compression engraving of back, engraving is at the height consistent (promptly stretch after recompress, pattern dimension be reduced) of the pattern size in a circumferential direction on the version roll body face of cylinder with the layout that obtains after step (1) is handled.Like this; Site number on the pattern circumferencial direction on the gravure printing roller increases to N doubly, increased the resolution ratio of circumferencial direction, and the site size remains unchanged basically; Thereby make on the print product the corresponding definition of pattern on short transverse rise to N doubly, and contain the China ink amount and can not reduce.

The gravure printing roller that adopts engraving process of the present invention to make; Improved the resolution ratio on the layout circumferencial direction; The print product of this gravure printing roller printing; Pattern above it (the particularly more tiny literal of lines) has sufficiently high definition, and it is high to contain China ink amount, can take into account printed pattern definition with contain China ink and measure the requirement aspect two.

Description of drawings

Fig. 1 is the schematic flow sheet of the preferred embodiment of the present invention;

Fig. 2 is the schematic flow sheet of the engraving process of existing gravure printing roller in the Comparative Examples.

The specific embodiment

Comparative Examples

For ease of contrast, combine Fig. 2 that the engraving process of existing gravure printing roller is described further earlier.

The engraving process of existing gravure printing roller comprises the steps:

(1) by the requirement of plate-making certificate of entrustment, layout is handled (as cutting), make layout and target pattern consistent size; Referring to Fig. 2 it (a), the width of layout 01 is W, highly for H;

(2) make subpoena file 02 according to the layout that obtains after step (1) processing 01, the circumferential size of subpoena file 02 is consistent with the circumferential size L of version roll body; Referring to Fig. 2 it (b), the circumferential size of subpoena file 02 is L;

(3) subpoena file 02 is sent to electronic engraving machine, electronic engraving machine is carved layout 01 on the face of cylinder of version roll body with the automatic seamless connected mode, obtains depiction 01 '.Electronic engraving machine forms engraving control signal according to subpoena file 02, drives the graver motion, and graver incision copper layer is carved out corresponding ink cell on the copper layer; In the engraving process, version roll body rotation (rotary speed of version roll body is the benchmark rotary speed), graver vibration (vibration frequency of graver is the benchmark vibration frequency).Referring to Fig. 2 it (c); A certain pattern unit 03 in the layout 01 is carved the face of cylinder 05 of version roll body (among Fig. 2 it (c); The face of cylinder 05 of version roll body expands into rectangle) go up after, the number of the site 04 on the depiction unit 03 ' circumferencial direction that obtains is five.

Embodiment

Below in conjunction with Fig. 1 the engraving process of gravure printing roller of the present invention is elaborated.

In the present embodiment, the engraving process of gravure printing roller comprises the steps:

(1) by the requirement of plate-making certificate of entrustment, layout is handled (as cutting), make layout 1 and target pattern consistent size;

Above-mentioned layout 1 designs according to the target pattern of required printing, and layout 1 adopts resolution ratio to be not less than the tiff figure of 600dpi;

The size of layout 1 after treatment is exactly the size that requires above the plate-making certificate of entrustment; Pattern dimension comprises the width and the height of pattern, and wherein the width of pattern is the size of pattern on the version roll body is axial, and the height of pattern is the size of pattern on version roll body circumferencial direction; Referring to Fig. 1 it (a), the width of layout 1 is W, highly for H;

The height of the layout 1 that (2) obtains after step (1) is handled stretches, and the height of the back layout 2 that stretches is 1.2 times of target pattern; Referring to Fig. 1 it (b), the width of the back layout 2 that stretches is W, highly is 1.2H;

(3) set the circumferential size of subpoena file 3 according to the stretch height number of back layout 2 of step (2), make subpoena file 3, the circumferential size of the subpoena file 3 of made be 1.2 times of circumferential size L of edition roll body; Referring to Fig. 1 it (c), the circumferential size of subpoena file 3 is 1.2L;

(4) subpoena file 3 is sent to electronic engraving machine; Electronic engraving machine carries out screening according to the circumferential size 1.2L of subpoena file 3 earlier; Pass through screening; Site number after stretching on layout 2 circumferencial directions increases to 1.2 times (being that the site number is 1.2 times that adopt when having engraving process now in the Comparative Examples); Referring to Fig. 1 it (d), in the back layout 2 that stretches with Comparative Examples in the number of site 5 on pattern unit 03 corresponding pattern unit 4 circumferencial directions be six; Again with the automatic seamless connected mode, the back layout 2 that stretches along the circumferential direction to be compressed carve on the face of cylinder of version roll body, its compression ratio is 1/1.2, obtains gravure printing roller.

In the step (4); The compression engraving of pattern adopts following manner to realize: in the process that electronic engraving machine (adopting and the same electronic engraving machine of Comparative Examples) is carved; The vibration frequency of graver equals the benchmark vibration frequency, and the rotary speed of version roll body then is 1/1.2 of a benchmark rotary speed.

After back layout 2 compressions that will stretch are carved; The height of the layout 1 that engraving obtains after the depiction 1 ' size in a circumferential direction on the version roll body face of cylinder 6 and step (1) are handled is consistent, and (back that promptly stretches recompresses; Pattern dimension is reduced); Referring to Fig. 1 it (e); Engraving is on the face of cylinder 6 of version roll body (among Fig. 1 it (e); The face of cylinder 6 of version roll body expands into rectangle) on the width of depiction 1 ' be W, highly be H that wherein the number of the site 5 ' on the depiction unit 4 ' circumferencial direction that obtains after carving on the face of cylinder of version roll body of pattern unit 4 is six, the size of depiction unit 4 ' then with Comparative Examples in the consistent size of depiction unit 03 '.

Claims

1. the engraving process of a gravure printing roller is characterized in that comprising the steps:

(1) by the requirement of plate-making certificate of entrustment, layout is handled, made layout and target pattern consistent size;

2. the engraving process of gravure printing roller according to claim 1 is characterized in that: layout is the tiff figure that resolution ratio is not less than 600dpi in the step (1).

3. the engraving process of gravure printing roller according to claim 1 is characterized in that: N=1.2.

4. according to the engraving process of each described gravure printing roller of claim 1-3; It is characterized in that: in the step (4); The compression engraving of pattern adopts following manner to realize: in the process that electronic engraving machine is carved; The vibration frequency of graver equals the benchmark vibration frequency, and the rotary speed of version roll body is the 1/N of benchmark rotary speed.