Overprinting method for improving precision of laser photoetching pattern and combined overprinting mark

Abstract

The invention discloses an overprinting method for improving the precision of a laser photoetching pattern and a combined overprinting mark, and the method comprises the steps: manufacturing the combined overprinting mark, each overprinting marking line corresponds to a color group, and each color group is registered with a laser photoetching positioning line; combined overlay marks are placed at the positions of the printed positive pull gauge and the printed negative pull gauge; and during printing adjustment overprinting, marking lines of all color plates are completely overlapped with laser photoetching positioning lines, so that accurate overprinting is realized. The whole periphery of the combined overprinting mark is rectangular, and the rectangle is composed of a plurality of grids. According to the other combination overprinting mark, a solid circle is arranged in the center of a cross curve, the cross curve in the middle of the solid circle is arranged to be a white hollow line, an outer circle is arranged on the periphery of the adjacent solid circle, a rhombus is arranged on the periphery of the outer circle, and four corner points of the rhombus are located on coordinate lines respectively. The overprinting mark is a plane figure composed of registration lines corresponding to different colors, and complete registration is finally achieved by checking whether a single-color registration line and a photoetching line of each color are completely overlapped or not.

Description

Technical Field

[0001] The invention relates to the field of printing, and in particular to a laser photolithography special plate pattern overprinting method. Background Art

[0002] In the prior art, the traditional overprinting method uses a simple cross-line as the overprint combination mark. The printed product is composed of 4 colors or even more than 10 colors. The same cross-line is used. When multiple lines are mixed and overlapped together, it is very messy. The naked eye cannot accurately identify whether a single color is deviated, nor can the deviation size be accurately measured. The printed pattern and the local laser lithography pattern are slowly registered, and when the laser lithography special plate pattern is used for printing, inaccurate overprinting occurs. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention aims to provide a method for improving the precision overprinting of laser lithography patterns, comprising the following steps: 1) Design and produce a combined overprint mark, where each overprint mark line corresponds to a color group, and each color group is aligned with the laser lithography positioning line; 2) When typesetting products with laser lithography positioning lines, place a combined overprint mark at the printing positive and negative drawing gauges, with the conventional paper fiber direction being longitudinal; 3) When adjusting the overprint during the printing process, the marking lines of each color plate are completely overlapped with the laser lithography positioning lines to achieve accurate overprinting.

[0004] A combined overprint mark for the above-mentioned overprinting, the outer periphery of the combined overprint mark is a rectangle as a whole, the rectangle is divided into two by a line in the longitudinal direction, and the rectangle is divided into three equal parts in the transverse direction by three lines, forming 8 grids of the same size, the diameter of the line is 0.1 mm, and the line is a laser lithography positioning line.

[0005] A combined overprint mark for the above-mentioned overprinting, the combined overprint icon is, a cross line is set, a solid circle is set in the center of the cross line, the cross line in the middle of the solid circle is set as a white hollow line, the diameter of the white hollow line is a 0.1 mm laser etching positioning line, the outer periphery of the adjacent solid circle is an outer circle, the outer circle line diameter is a 0.05 mm laser etching positioning line, the outer periphery of the outer circle is a rhombus, the four corner points of the rhombus are respectively located on the coordinate lines, and the line diameter of the rhombus is 0.1 mm laser etching positioning line.

[0006] Positive pull gauge and reverse pull gauge are terms in the printing industry. Positive pull gauge and reverse pull gauge refer to the left and right sides of the paper. The positive pull gauge is the pull gauge on the operating surface, and the reverse pull gauge on the opposite side.

[0007] The combined overprint mark of the present invention is a plane figure composed of positioning lines corresponding to different colors. During printing, overprinting and plate adjustment are carried out, and the combined overprint mark is used to measure the line segments of the deviated colors, and the operation is performed to correct the deviation. By checking whether the single-color registration lines of each color and the photolithography lines are completely overlapped, complete registration is finally achieved. The defective product rate of the method is less than 0.5%, which saves production costs, avoids frequent revisions due to overprinting inaccuracies, saves plates, and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a schematic diagram of the structure before overprint calibration in Example 1 of the present invention; Figure 2 This is a schematic diagram of the overprint calibration structure of Example 1 of the present invention; Figure 3 This is a schematic diagram of the overprint calibration structure of Embodiment 2 of the present invention; Figure 4 It is a schematic diagram of the overprinting structure of the prior art; In the attached picture: 1 black overprinted marking line 2 blue overprinted marking line 3 red overprinted marking line 4 yellow overprinted marking line Line; 5 Example 1 laser lithography positioning line 6 solid circle 7 leaky line 8 outer circle 9 diamond. DETAILED DESCRIPTION

[0009] The present invention is described in detail below with reference to the accompanying drawings.

[0010] Figure 4 The prior art overprint combination mark is a simple cross line. The printed product is composed of 4 colors or even more than 10 colors, and the same cross line is used. For example, if there are 7 colors, all use the same cross line. All are superimposed together, and it is difficult to see which color is out of position. For example, the same printing process is designed to have three white plates, namely white 1, white 2 and white 3. When printing overprint, because the three whites are all printed with white ink, it is impossible to distinguish whether white 1, white 2 or white 3 is offset by visual inspection. When multiple lines are mixed and overlapped together, it is very messy. The naked eye cannot accurately identify whether a single color is deviated, nor can it accurately measure the deviation size, resulting in inaccurate overprinting. Repeated testing of each plate will result in a large amount of printing waste loss. Example 1

[0011] Reference Figure 1 and attached Figure 2 ; 1) Design and manufacture a combined overprint mark, the outer periphery of the combined overprint mark is a rectangle, the rectangle is divided into two by a line in the longitudinal direction, and the rectangle is divided into three equal parts by three lines in the transverse direction, forming 8 grids of the same size, the lines are laser lithography positioning lines, and the diameter of the lines is 0.1 mm; 8 grids can correspond to 8 printing colors, and this embodiment uses four color overprints, in the figure, black overprint mark line 1; blue overprint mark line 2; red overprint mark line 3; yellow overprint mark line 4; laser lithography positioning line 5; The laser lithography positioning line 5 is set to gray as the reference line. The laser lithography special edition paper is offset printed. The offset printing color sequence is usually a superposition of black, blue, red and yellow. The first color is set to black, the second color is set to blue, the third color is set to red, and the fourth color is set to yellow. Different colors are numbered to distinguish them, and the numbers match the colors for overprinting; 2) When the product layout of the laser lithography positioning line is carried out, the combined overprint mark is placed on the positive and negative drawing gauges respectively, and the combined overprint mark is engraved on the PS printing plate during plate making; During the printing overprint process, single-color overprinting is performed separately to check whether the single-color cursor completely overlaps with the laser lithography positioning line. The marking lines of each color plate are overlapped with the laser lithography positioning line. When a single color plate deviation occurs, a 20-100x magnifying glass is used to measure the deviation size, and the deviation size is accurately set on the printing press. The multi-color overprint mark is used to make an overall registration judgment, and ultimately precise registration is achieved. Example 2

[0012] refer to Figure 3 ; The basic overprinting working principle of this embodiment is the same as that of embodiment 1. The overall overprinting icon of embodiment 2 is as follows: crosshair coordinates are set, a solid circle 6 is set in the center of the crosshairs, the so-called solid circle is opaque, and the scene behind the solid circle cannot be seen, and the crosshairs in the middle of the solid circle are set as white empty lines 7, the so-called white empty lines are scenes that can be seen, the diameter of the white empty lines is a 0.1 mm laser lithography positioning line, and the white empty lines are laser lithography positioning lines of one color group. The outer periphery of the adjacent solid circle is an outer circle 8, and the outer circle line diameter is a laser lithography positioning line of 0.05 mm, and the outer circle line is the laser lithography positioning line of another color group. The outer periphery of the outer circle is a rhombus 9, and the four corner points of the rhombus are respectively located on the coordinate lines, and the line diameter of the rhombus is 0.1 mm; one of the lines of the rhombus also corresponds to a laser lithography positioning line of a different color group; The middle of the solid circle is designed with a white 0.1mm leaky laser lithography positioning line to highlight the color deviation, making it more intuitive and obvious. At the same time, a relatively thin laser lithography positioning line of 0.05mm is designed on the outer ring of the solid circle. The thinner the line, the higher the overprint requirement. If the line is thin, the overprint deviation is obvious, and if the line is thick and deviated, it is not easy to see. Of course, the thinner the lines are, the better. The thinner the lines are, the more difficult the overprinting operation will be.

[0013] If there is a deviation, after single color registration, multi-color overprint mark verification is carried out. The engraved mark is superimposed by all the colors of the printed product. The laser lithography positioning line is set with multiple angles, solid and hollow different judgment methods, which can more finely control the overprint deviation range, and ultimately achieve the purpose of accurate overprinting between each color plate and the lithography pattern.

Claims

1. A method for improving the precision overprinting of laser lithography patterns, characterized in that The steps include: 1) Design and produce a combined overprint mark, where each overprint mark line corresponds to a color group, and each color group is aligned with the laser lithography positioning line; 2) When typesetting products with laser lithography positioning lines, place combined overprint marks at the printing positive and negative drawing gauges, with the conventional paper fiber direction being longitudinal; 3) When adjusting the overprint during printing, completely overlap the marking lines of each color plate with the laser lithography positioning lines to achieve accurate overprinting.

2. A combined overprint label for the above overprint, characterized in that: The outer periphery of the combined overprint mark is a rectangle as a whole, the rectangle is divided into two by a line in the longitudinal direction, and the rectangle is divided into three equal parts in the transverse direction by three lines, forming 8 grids of the same size, the diameter of the line is 0.1 mm, and the line is a laser lithography positioning line.

3. A combined overprint label for the above overprint, characterized in that: The overprint mark of the combination is to set a cross line, set a solid circle in the center of the cross line, set the cross line in the middle of the solid circle as a white hollow line, the diameter of the white hollow line is a laser lithography positioning line of 0.1 mm, and the outer periphery of the adjacent solid circle is an outer circle, the outer circle line diameter is a laser lithography positioning line of 0.05 mm, and the outer periphery of the outer circle is a rhombus, the four corner points of the rhombus are respectively located on the coordinate lines, and the line diameter of the rhombus is 0.1 mm laser lithography positioning line.

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