Color overlapping registration detection method

Abstract

The invention discloses a color overlapping registration detection method, belongs to the field of printing, and solves the problem that online detection cannot be performed when a plurality of unit color patterns are printed in the prior art. According to the detection method, firstly, a registration cursor on a first color group plate is used as a coloring reference positioning original point, all subsequent color group plates are aligned with a reference through recognition cursors on the color group plates to conduct color registration, whether the color group plates are qualified or not is judged by detecting the deviation value of the registration cursor and the recognition cursors, the registration conditions of all the color group plates can be visually monitored on line, and the purpose of online detection is achieved. According to the color-overlapping registration detection method disclosed by the invention, the simultaneous detection capability during multi-color color-overlapping printing registration online production is realized, the consistency of batch repetitive printing patterns is improved, and the method has the characteristics of wide application range and high practicability.

Description

Technical Field

[0001] The invention relates to the field of printing, and in particular to a method for detecting overlay registration. Background Art

[0002] Printing is a technology that transfers ink to the surface of paper, fabric, plastic, leather and other materials through processes such as plate making, inking and pressurization to batch reproduce the content of the original manuscripts, such as text, pictures, photos, anti-counterfeiting, etc. As people's aesthetic taste improves, they begin to pursue printing with exquisite patterns.

[0003] The colorful and exquisite patterns are composed of multiple unit colors. In the existing mass production, the required patterns are formed by superimposing and combining single-color printing. During printing, in order to ensure the consistency of the pattern, the inking of each color needs to be fixed at a fixed point. Because the coloring method or inking area of ​​each printing plate (roller) is different, the substrates are quite different after coloring. The ink on the surface of the paper will shrink after heating and drying. When the shrinkage ratios of the colors do not match, the pattern cannot be reproduced. When the pattern is printed at high speed, the fluctuation of the substrate and energy causes the shrinkage of the material to change, and it is impossible to monitor the quality online, resulting in batch scrapping. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method for detecting overlay registration in view of the above-mentioned deficiencies in the prior art, which realizes the simultaneous detection capability of multi-color overlay printing registration during online production, improves the consistency of batch repetitive printing patterns, and has the characteristics of wide application range and strong practicality.

[0005] The technical solution adopted by the present invention is: a method for detecting overlapping color registration, first using the registration cursor on the first color plate as the coloring reference positioning origin, and then using the identification cursor on each subsequent color plate to align with the reference to perform registration of each color, and by detecting the deviation between the registration cursor and the identification cursor, judging whether it is qualified, and being able to intuitively monitor the registration of each color plate online to achieve the purpose of online detection.

[0006] As a further improvement, the specific steps are as follows:

[0007] S1: First, use the engraving machine to engrave the registration positioning line and the registration cursor on the left and right sides of the pattern to be printed in the first color grouping;

[0008] S2: Then the engraving machine engraves the identification cursor and the registration positioning line on the subsequent color grouping;

[0009] S3: Each color printing plate is installed on the printing station of each color group unit of the printing press, and each color group is inked according to the printing design requirements;

[0010] S4: When the first color plate grouping pattern is fed to the second color plate grouping, the deviation between the identification cursor and the registration cursor is detected, and the calculated deviation is compared with the threshold value according to the preset registration deviation threshold value to determine whether the printed image registration is qualified. If the registration deviations of each plate are within the threshold range, the registration is considered qualified, otherwise, the registration is considered unqualified;

[0011] S5: if the test result is unqualified, the registration deviation and shrinkage ratio are adjusted so that the second color plate group corresponds to the fixed point position of the registration cursor of the first color plate group, and the registration positioning line of the second color plate group is aligned with the registration positioning line of the first color plate group to complete the registration;

[0012] S6: Repeat steps S4-S5 for each subsequent grouping to align the registration cursor respectively, completing the registration and playing a detection role at the same time.

[0013] Furthermore, when in use, each color group uses the registration positioning line as the "0" point positioning line. When a deviation in registration is detected, the paper shrinkage ratio of the deviation color group after drying is adjusted according to the registration deviation between the identification cursor and the registration cursor to achieve registration in the "X" axis direction, and the longitudinal deviation distance of the deviation color group is adjusted to achieve registration in the "Y" axis direction.

[0014] Furthermore, the number of the color printing plates is six, namely the first color plateset, the second color plateset, the third color plateset, the fourth color plateset, the fifth color plateset, and the sixth color plateset. The first color plateset is the background color plateset of the graphics, and the second color plateset, the third color plateset, the fourth color plateset, the fifth color plateset, and the sixth color plateset are all monochrome platesets.

[0015] Beneficial Effects

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] The present invention provides a method for detecting overlay color registration, which can realize the simultaneous detection capability of multi-color overlay color printing registration during online production by engraving registration positioning lines and registration cursors on the first color group plate, and engraving identification cursors and registration positioning lines on the subsequent color group plate, and judging whether they are qualified by detecting the deviation of the registration cursor and the identification cursor, thereby effectively improving the consistency of batch repetitive printing patterns, filling the gap in the process that registration cannot be detected online during printing, and effectively improving the production quality of products, and having the characteristics of strong practicality and wide application range. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the process of the present invention;

[0019] Figure 2 Schematic diagram of registration of various color typesets in an embodiment of the present invention;

[0020] Figure 3 Schematic diagram of the pattern registration printing process in an embodiment of the present invention. DETAILED DESCRIPTION

[0021] The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

[0022] See also Figure 1-3 As shown, a method for detecting overlay color registration of the present invention first uses the registration cursor on the first color plate group as the coloring reference positioning origin, and then uses the identification cursor on the subsequent color plate groups to align with the reference to perform registration of each color, and determines whether it is qualified by detecting the deviation between the registration cursor and the identification cursor. The registration of each color plate can be monitored intuitively online to achieve the purpose of online detection, and the ability to simultaneously detect the registration of multi-color overlay printing during online production can be realized, which effectively improves the consistency of batch repetitive printing patterns, fills the process gap that registration cannot be detected online during printing, and effectively improves the production quality of products, which has the characteristics of strong practicality and wide application range.

[0023] Specifically, the steps are as follows:

[0024] S1: First, use the engraving machine to engrave the registration positioning line and the registration cursor on the left and right sides of the pattern to be printed in the first color grouping;

[0025] S2: Then the engraving machine engraves the identification cursor and the registration positioning line on the subsequent color grouping;

[0026] S3: Each color printing plate is installed on the printing station of each color group unit of the printing press, and each color group is inked according to the printing design requirements;

[0027] S4: When the first color plate grouping pattern is fed to the second color plate grouping, the deviation between the identification cursor and the registration cursor is detected, and the calculated deviation is compared with the threshold value according to the preset registration deviation threshold value to determine whether the printed image registration is qualified. If the registration deviations of each plate are within the threshold range, the registration is considered qualified, otherwise, the registration is considered unqualified;

[0028] S5: if the test result is unqualified, the registration deviation and shrinkage ratio are adjusted so that the second color plate group corresponds to the fixed point position of the registration cursor of the first color plate group, and the registration positioning line of the second color plate group is aligned with the registration positioning line of the first color plate group to complete the registration;

[0029] S6: Repeat steps S4-S5 for each subsequent grouping to align the registration cursor respectively, completing the registration and playing a detection role at the same time.

[0030] In this embodiment, the graphics are divided into six color groups, and the registration positioning line and the registration cursor are engraved on the first color group, and the identification cursor and the registration positioning line are engraved on the second color group, the third color group, the fourth color group, the fifth color group, and the sixth color group. With the registration cursor as a reference, when the first color group pattern is fed to the second color group, the deviation between the identification cursor and the registration cursor is detected, and the calculated deviation is compared with the threshold according to a preset registration deviation threshold to determine whether the image registration of the printed product is qualified. If qualified, the next step of printing is continued, and if unqualified, the overprint deviation and the shrinkage ratio are adjusted by scaling the pixels by multiples, so that the second color group corresponds to the fixed point position of the registration cursor of the first color group, so that the deviation is within the error range, so as to complete the registration. The subsequent color groups use the same registration method to achieve online detection and adjustment, thereby improving the consistency of batch repetitive printing patterns and improving product quality. In actual use, the color groups into which the graphics are divided are not limited to six color groups, and can be grouped according to the actual number of color types of the graphics. The number of color groups is the number of color types of the graphics.

[0031] Furthermore, when in use, each color group uses the registration positioning line as the "0" point positioning line. When a deviation in registration is detected, the "X" axis direction is registered by adjusting the paper shrinkage ratio of the deviation color group after drying based on the registration deviation between the identification cursor and the registration cursor. The "Y" axis direction is registered by adjusting the longitudinal deviation distance of the deviation color group. The registration positioning line is used as the "0" point positioning line to ensure the consistency of subsequent positioning, ensure the uniformity of positioning reference, and ensure the uniformity of product printing.

[0032] Furthermore, the number of the color printing plates is six, namely the first color plateset, the second color plateset, the third color plateset, the fourth color plateset, the fifth color plateset, and the sixth color plateset. The first color plateset is the background color plateset of the graphics, and the second color plateset, the third color plateset, the fourth color plateset, the fifth color plateset, and the sixth color plateset are all monochrome platesets. The first color plateset is the background color plateset of the graphics. Since there is a registration cursor on the first color plateset, the phenomenon of difficulty in aligning the pattern when printing the background color is effectively avoided. The subsequent color platesets are printed in monochrome to ensure that the shrinkage rates of each color are consistent and the smooth molding of the product is guaranteed.

[0033] The above is only a preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A color overlay registration detection method, characterized in that: First, the registration cursor on the first color plate is used as the coloring reference to locate the origin, and the subsequent color plates use the identification cursor on it to align with the reference to register each color. By detecting the deviation between the registration cursor and the identification cursor, it is judged whether it is qualified. The registration status of each color plate can be monitored intuitively online to achieve the purpose of online detection.

2. A color overlay registration detection method according to claim 1, characterized in that: The specific steps are as follows: S1: First, use the engraving machine to engrave the registration positioning line and the registration cursor on the left and right sides of the pattern to be printed in the first color grouping; S2: Then the engraving machine engraves the identification cursor and the registration positioning line on the subsequent color grouping; S3: Each color printing plate is installed on the printing station of each color group unit of the printing press, and each color group is inked according to the printing design requirements; S4: When the first color plate grouping pattern is fed to the second color plate grouping, the deviation between the identification cursor and the registration cursor is detected, and the calculated deviation is compared with the threshold value according to the preset registration deviation threshold value to determine whether the printed image registration is qualified. If the registration deviations of each plate are within the threshold range, the registration is considered qualified, otherwise, the registration is considered unqualified; S5: if the test result is unqualified, the registration deviation and shrinkage ratio are adjusted so that the second color plate group corresponds to the fixed point position of the registration cursor of the first color plate group, and the registration positioning line of the second color plate group is aligned with the registration positioning line of the first color plate group to complete the registration; S6: Repeat steps S4-S5 for each subsequent grouping to align the registration cursor respectively, completing the registration and playing a detection role at the same time.

3. A color overlay registration detection method according to claim 2, characterized in that: When in use, each color group uses the registration positioning line as the "0" point positioning line. When the detection registration deviation occurs, the "X" axis direction is registered by adjusting the paper shrinkage ratio of the deviation color group after drying according to the registration deviation between the identification cursor and the registration cursor. The "Y" axis direction is registered by adjusting the longitudinal deviation distance of the deviation color group.

4. A color overlay registration detection method according to claim 2, characterized in that: The number of the color printing plates is six, namely the first color plate group, the second color plate group, the third color plate group, the fourth color plate group, the fifth color plate group, and the sixth color plate group. The first color plate group is the background color plate group of the graphics, and the second color plate group, the third color plate group, the fourth color plate group, the fifth color plate group, and the sixth color plate group are all monochrome plate groups.

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