CN115782397A - Calibrate the printing process - Google Patents

Abstract

The invention discloses a calibration printing process, comprising: 1) making a standard manuscript and a sample, establishing a coordinate system for the standard manuscript and the sample respectively, and marking the standard manuscript and the sample, the standard manuscript and the Reference points are set on the sample draft; 2) the standard draft and the sample draft are placed on the screen exposure machine respectively, and the positioning is fixed; 3) the CCD camera of the screen exposure machine obtains the position of the marking point on the standard draft and the sample draft position; 4) compare the marking point of the sample draft with the marking point of the standard draft, and calculate the deformation amount of the sample draft; 5) calculate the compensation parameter according to the deformation amount, and deform the pattern to be printed Compensation; 6) Take off the sample draft, place the screen plate, and perform screen printing after the printing machine obtains the compensation parameters. This process enables calibration of pattern printing between different steps in the printing process.

Description

Calibrate the printing process

technical field

The invention relates to the field of printing, in particular to a calibration printing process.

Background technique

In the printing process, there are often different printing processes for the same pattern. For example, first perform offset printing on a certain part of the pattern, and then perform silk screen printing on the remaining pattern. At this time, it is necessary to accurately correspond between the offset printed pattern and the silk screen pattern. In the offset printing process, the printed paper or other materials will experience expansion and contraction deformation during the printing process. However, the plate making of silk screen printing is made according to the size of the original manuscript before deformation. Therefore, when printing according to the original plate making, the pattern will deviate. In the prior art, the film is usually used for screen printing plate making, the film sheet is cut according to the image unit, and then compared according to the actual deformation of the offset printing, the film sheet is reassembled, and finally the film sheet is used for plate making. Due to the poor accuracy of screen printing plate making with film, the operation of cutting and splicing film is completely done manually, and the accuracy is difficult to guarantee, which relies heavily on human experience. In filmless screen exposure processes, such as computer-to-plate processes, there is currently no solution to this problem.

The information disclosed in this Background section is only for enhancing the understanding of the general background of the present invention and should not be taken as an acknowledgment or any form of suggestion that the information constitutes the prior art that is already known to those skilled in the art.

Contents of the invention

The object of the present invention is to provide a calibration printing process, which can realize the calibration of pattern printing between different steps in the printing process.

In order to achieve the above purpose, an embodiment of the present invention provides a calibration printing process, including:

1) make standard draft and sample draft, establish coordinate system respectively to described standard draft and sample draft, and described standard draft and sample draft are marked, described standard draft and described sample draft are provided with datum point;

2) Place the standard draft and sample draft on the screen exposure machine respectively, and fix the positioning;

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

4) comparing the marking point of the sample draft with the marking point of the standard draft, calculating the amount of deformation of the sample draft;

5) Calculate compensation parameters according to the amount of deformation, and perform deformation compensation on the pattern to be printed;

6) Take down the sample draft, place the screen plate, and perform screen printing after the printing machine obtains the compensation parameters.

In one or more embodiments of the present invention, in step 2), when the standard draft and the sample draft are placed on the screen exposure machine, the reference points and coordinate axes of the standard draft and the sample draft completely coincident.

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

In one or more embodiments of the present invention, step 4) includes: calculating the distance between the marking point of the standard manuscript and the corresponding marking point of the sample, using the distance to calculate the distance between the sample and the standard The amount of deformation between drafts.

In one or more embodiments of the present invention, there are multiple marking points of the standard draft and the marking points of the sample draft.

In one or more embodiments of the present invention, step 4) 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 are calculated respectively and obtain multiple sets of distances to calculate the deformation between the sample and the standard draft.

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

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

In one or more embodiments of the present invention, the reference point is located on the coordinate axis of the coordinate system.

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

Compared with the prior art, according to the calibration printing process of the embodiment of the present invention, after offset printing and before silk screen printing, the CCD camera of the screen exposure machine can read the pattern after offset printing to obtain the amount of deformation, so that the amount of deformation can be obtained before silk screen printing. Calibrate the silk screen pattern to achieve the accuracy of pattern printing.

Description of drawings

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

Detailed ways

The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations thereof such as "includes" or "includes" and the like will be understood to include the stated elements or constituents, and not Other elements or other components are not excluded.

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

1) Make a standard draft and a sample draft, where the sample draft is a pattern that has been deformed after printing, and the standard draft is a pattern that has not undergone deformation. After the standard draft and the sample draft are prepared, it is necessary to establish a coordinate system for the standard draft and the sample draft respectively, and to mark the standard draft and the sample draft, and set a reference point on the standard draft and the sample draft.

2) Place the standard draft and sample draft on the screen exposure machine respectively, and use the mechanism of the screen exposure machine to position and fix the standard draft and sample draft through vacuum adsorption. And in actual operation, the standard draft is placed on the screen exposure machine first, and the screen exposure machine finishes processing the standard draft and then places the sample draft. When the standard draft and the sample draft are placed on the screen exposure machine successively, the reference point of the standard draft and the sample draft and the orthographic projection of the coordinate axes on the screen exposure machine must completely coincide.

3) The CCD camera of the screen exposure machine obtains 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 marking point and the reference point of the standard draft, and the standard point and reference point of the sample draft. The CCD camera obtains the reference points of the standard draft and the sample draft separately to ensure that when the standard draft and the sample draft are compared, there will be no positional deviation between the two patterns, which will cause a large error in the subsequent calculation of the marking points.

4) Comparing the marking points of the sample draft with those of the standard draft, and calculating the deformation of the sample draft. This step mainly calculates the distance between the marking point of the standard draft obtained in step 3) and the corresponding marking point of the sample draft, and calculates the deformation between the sample draft and the standard draft by combining the computer program and related algorithms through this distance quantity. Wherein, there may be only one marking point for the standard draft and the proof draft. In order to obtain the amount of deformation accurately, multiple marking points are set on the standard draft, and multiple corresponding marking points are set on the sample draft. When multiple marking points are set on the standard draft and the proof draft, the distance between the marking point of the standard draft and the corresponding marking point of the sample draft needs to be calculated separately, and multiple sets of distances are obtained to calculate the deformation between the proof draft and the standard draft. When dealing with multiple sets of distances, the amount of deformation is obtained by processing the average, median, or mode value of multiple sets of distances.

5) Calculate the compensation parameters according to the amount of deformation, and perform deformation compensation on the pattern to be printed;

6) Take down the sample draft, place the screen plate, and perform screen printing after the printing machine obtains the compensation parameters.

In the above steps, the origin of the coordinate system is located at the edge or center of the standard draft and the sample draft. At the same time, the reference point is located on the coordinate axes of the coordinate system. For the convenience of processing, the origin of the coordinate system can be selected as the reference point.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. These descriptions are 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 the specific principles of the invention and its practical application, thereby enabling others skilled in the art to make and use various exemplary embodiments of the invention, as well as various Choose and change. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims (10)

1. A calibration printing process, comprising:

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) The 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 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.

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