CN115782397A

CN115782397A - Calibrating printing process

Info

Publication number: CN115782397A
Application number: CN202211624301.2A
Authority: CN
Inventors: 周超; 马迪; 吴景舟
Original assignee: Jiangsu Youdi Laser Technology Co ltd
Current assignee: Jiangsu Youdi Laser Technology Co ltd
Priority date: 2022-12-16
Filing date: 2022-12-16
Publication date: 2023-03-14

Abstract

The invention discloses a calibration printing process, which comprises the following steps: 1) Making a standard draft and a sample draft, respectively establishing a coordinate system for the standard draft and the sample draft, and marking the standard draft and the sample draft, wherein reference points are arranged on the standard draft and the sample draft; 2) Respectively placing the standard draft and the sample draft on a screen exposure machine, and positioning and fixing; 3) A CCD camera of the silk screen exposure machine acquires the positions of the marking points on the standard draft and the sample draft; 4) Comparing the mark points of the sample manuscript with the mark points of a standard manuscript, and calculating the deformation of the sample manuscript; 5) Calculating a compensation parameter according to the deformation amount, and performing deformation compensation on the pattern to be printed; 6) And taking down the sample draft, placing the screen printing plate, and performing screen printing after the printer acquires the compensation parameters. The process enables calibration of the pattern printing between different steps in the printing process.

Description

Calibrating printing process

Technical Field

The present invention relates to the field of printing, and more particularly to a calibration printing process.

Background

During the printing process, there are often times when the same pattern requires different printing processes. For example, a certain portion of the patterns is offset printed, and then the remaining patterns are silk-screened, so that the offset printed patterns and the silk-screened patterns need to be accurately matched. In the offset printing process, the printed paper or other material undergoes expansion and contraction deformation during the printing process. The plate-making for screen printing is performed according to the original size before deformation, and therefore, when the original plate-making is printed, the pattern is deviated. In the prior art, a silk-screen printing plate is usually made by a film, a film is cut according to image units, then comparison is performed according to the actual deformation condition of an offset printed matter, the film is spliced again, and finally the film is used for making a plate. Because the original precision of silk-screen plate-making by using the film is poorer, the operation of cutting and splicing the film is completely finished manually, the precision is difficult to ensure, and the dependence on the experience of people is very large. In a film-free screen exposure process, such as a computer-to-plate process, there is currently no way to deal with this problem.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is already known to a person skilled in the art.

Disclosure of Invention

The invention aims to provide a calibration printing process which can realize calibration of pattern printing between different steps in the printing process.

To achieve the above object, an embodiment of the present invention provides a calibration printing process, including:

1) Making a standard draft and a sample draft, respectively establishing a coordinate system for the standard draft and the sample draft, and marking the standard draft and the sample draft, wherein reference points are arranged on the standard draft and the sample draft;

2) Respectively placing the standard draft and the sample draft on a screen exposure machine, and positioning and fixing;

3) A CCD camera of the silk screen exposure machine acquires the positions of the marking points on the standard draft and the sample draft;

4) Comparing the mark points of the sample manuscript with the mark points of a standard manuscript, and calculating the deformation of the sample manuscript;

5) Calculating a compensation parameter according to the deformation amount, and performing deformation compensation on the pattern to be printed;

6) And taking down the sample draft, placing the screen printing plate, and performing screen printing after the printer acquires the compensation parameters.

In one or more embodiments of the present invention, in step 2), when the standard document and the sample document are placed on the screen exposure machine, the reference point and the coordinate axis of the standard document and the sample document completely coincide.

In one or more embodiments of the present invention, the acquiring the position of the marker point in step 3) includes: and acquiring the positions of the marking point and the reference point of the standard draft and the positions of the marking point and the reference point of the sample draft.

In one or more embodiments of the invention, step 4) comprises: and calculating the distance between the marking point of the standard draft and the corresponding marking point of the sample draft, and calculating the deformation between the sample draft and the standard draft by using the distance.

In one or more embodiments of the present invention, a plurality of mark points of the standard manuscript and a plurality of mark points of the sample manuscript are provided.

In one or more embodiments of the present invention, when the standard manuscript and the proof are provided with a plurality of mark points in step 4), distances between the mark points of the standard manuscript and corresponding mark points of the proof are respectively calculated, and a plurality of groups of distances are obtained to calculate a deformation amount between the proof and the standard manuscript.

In one or more embodiments of the present invention, when processing the plurality of sets of distances, the deformation amount is selected from one of an average value, a median value, or a mode value of the plurality of sets of distances.

In one or more embodiments of the present invention, the origin of the coordinate system is located at an edge or a center of the standard manuscript and the proof manuscript.

In one or more embodiments of the invention, the reference points are located on coordinate axes of the coordinate system.

In one or more embodiments of the invention, the reference point is an origin of the coordinate system.

Compared with the prior art, according to the calibration printing process provided by the embodiment of the invention, after offset printing and before silk-screen printing, the CCD camera of the silk-screen exposure machine is used for reading the offset-printed pattern to obtain the deformation, so that the silk-screen pattern is calibrated before silk-screen printing, and the accuracy of pattern printing is realized.

Drawings

FIG. 1 is a schematic diagram of a calibration printing process according to an embodiment of the present invention.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

As shown in fig. 1, a calibration printing process according to a preferred embodiment of the present invention includes:

1) And manufacturing a standard draft and a sample draft, wherein the sample draft is a pattern which is deformed after printing, and the standard draft is a pattern which is not deformed. After the standard draft and the sample draft are manufactured, coordinate systems need to be respectively established for the standard draft and the sample draft, the standard draft and the sample draft are marked, and reference points are arranged on the standard draft and the sample draft.

2) And respectively placing the standard draft and the sample draft on a screen exposure machine, and positioning and fixing the standard draft and the sample draft by utilizing a mechanism of the screen exposure machine through vacuum adsorption. In actual operation, the standard draft is placed on the screen exposure machine, and the screen exposure machine processes the standard draft and then places the draft. When the standard manuscript and the sample manuscript are successively placed on the screen exposure machine, the reference points of the standard manuscript and the sample manuscript are completely coincided with the orthographic projection of the coordinate axes on the screen exposure machine.

3) And a CCD camera of the silk screen exposure machine acquires the positions of the marking points on the standard draft and the sample draft. In this step, the CCD camera sequentially acquires the positions of the mark point and the reference point of the standard draft, and the standard point and the reference point of the sample draft. The CCD camera respectively acquires the reference points of the standard draft and the sample draft so as to ensure that when the standard draft is compared with the sample draft, the patterns of the standard draft and the sample draft have no position deviation, and large errors occur in the subsequent calculation of the marking points.

4) And comparing the mark points of the sample manuscript with the mark points of the standard manuscript, and calculating the deformation of the sample manuscript. In the step, the distance between the mark point of the standard manuscript acquired in the step 3) and the corresponding mark point of the sample manuscript is mainly calculated, and the deformation amount of the sample manuscript compared with the standard manuscript is calculated by combining the distance with a computer program and a related algorithm. Wherein, there may be only one mark point of the standard manuscript and the sample manuscript. In order to accurately obtain the deformation, a plurality of marking points are arranged on the standard manuscript, and a plurality of corresponding marking points are arranged on the sample manuscript. When the standard draft and the sample draft are provided with a plurality of marking points, the distances between the marking points of the standard draft and the corresponding marking points of the sample draft need to be calculated respectively, and a plurality of groups of distances are obtained to calculate the deformation between the sample draft and the standard draft. When a plurality of groups of distances are processed, the deformation amount is obtained by processing one of the average value, the median value or the mode of the plurality of groups of distances.

In the above steps, the origin of the coordinate system is located at the edge or the middle center of the standard manuscript and the proof manuscript. While the reference points are located on the coordinate axes of the coordinate system. For ease of handling, the reference point may select the origin of the coordinate system.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims

1. A calibration printing process, comprising:

3) The CCD camera of the silk screen exposure machine acquires the positions of the marking points on the standard draft and the sample draft;

6) And taking down the sample draft, placing a screen printing plate, and performing screen printing after the printer acquires the compensation parameters.

2. The calibration printing process of claim 1, wherein in step 2), when the standard document and the sample document are placed on the screen exposure machine, the reference points and the coordinate axes of the standard document and the sample document are completely coincident.

3. The calibration printing process of claim 1, wherein the acquiring of the marker point positions in step 3) comprises: and acquiring the positions of the marking point and the reference point of the standard draft and the positions of the marking point and the reference point of the sample draft.

4. The calibration printing process of claim 1, wherein step 4) comprises: and calculating the distance between the marking point of the standard draft and the corresponding marking point of the sample draft, and calculating the deformation between the sample draft and the standard draft by using the distance.

5. The calibration printing process according to claim 1, wherein the marking points of the standard document and the marking points of the proof document are provided in plural numbers.

6. The calibration printing process of claim 5, wherein, when the standard draft and the proof are provided with a plurality of marks in step 4), the distances between the marks of the standard draft and the corresponding marks of the proof are respectively calculated, and a plurality of groups of distances are obtained to calculate the deformation between the proof and the standard draft.

7. The calibration printing process of claim 6, wherein the deformation is selected from one of an average, median, or mode of the plurality of sets of distances when processing the plurality of sets of distances.

8. The calibration printing process of any of claims 1-7, wherein the origin of the coordinate system is located at the edge or center of the master and the proof.

9. The calibration printing process of claim 8, wherein the reference points are located on coordinate axes of the coordinate system.

10. The calibration printing process of claim 9, wherein the reference point is an origin of the coordinate system.