CN108621534B - Method for detecting screen collision before mixed printing platemaking with different resolutions - Google Patents

Abstract

The invention discloses a method for detecting the collision before plate making of mixed printing with different resolutions. package, and a second RIP output file package with the second resolution feature; the design draft requires CMYK to be printed at the first resolution, the background color is spot color, and printed at the second resolution; B. The CMYK color RIP output files in the first RIP output file package and the spot color RIP output files in the second RIP output file package are selected and merged to form the third RIP output file package; C. Use the third RIP output file package for digital proofing, Observe whether the digital sample has the phenomenon of hitting the net. The invention can realize whether the mixed printing of different resolutions will have the phenomenon of hitting the screen by means of digital proofing.

Description

Detection method of screen collision before plate making in mixed printing with different resolutions

technical field

The invention belongs to the technical field of printing, and relates to a method for detecting screen collision before mixing printing plate making with different resolutions.

Background technique

A flexo printing product in actual printing uses the following screen angles before printing: CMYK adopts flexo printing conventional screen angles: C: 67.5°, M: 37.5°, Y: 82.5°, K: 7.5°; Color purple as the background color) and K at the same angle: 7.5°, the number of plate-making lines is 100L. The real dots are used to simulate ordinary CDI plate-making output with an output accuracy of 2540dpi, and the printing digital samples are normal without collision with the flexo printing dots. The digital samples are shown in Figure 1.

The above digital samples are output at 2540dpi resolution (C: 67.5°, M: 37.5°, Y: 82.5°, K: 7.5°, purple background: 7.5°). There is no problem with true dots; The blending area of the bottom has the phenomenon of moire pattern hitting the net, as shown in Figure 2 and Figure 3. Why is there such a situation?

Those skilled in the art all know that the current mainstream flexographic plate-making is divided into the coexistence of traditional common CDI and flat-top screen plate-making, wherein:

1. The output precision of ordinary CDI plate making is 2540dpi;

2. The output precision of Kodak flat-top plate-making physical screening is 2400dpi;

3. The output precision of esko flat-top pre-press front-end screening is 4000dpi;

4. The output precision of the physical screen of the rubber version is 5080dpi.

In the above printing samples, CMYK uses ordinary CDI to adopt 2540dpi ordinary Flint plate and screen-making, while the special purple net adopts DuPont P+ flat top 4000dpi resolution plate-making alone. After verifying the rip plate-making file of the plate-making factory, it is confirmed that: In actual printing, the above phenomenon of hitting the net moiré is caused by the mixed use of different plate-making output resolutions of 2540dpi and 4000dpi. However, the existing digital samples are all output with the same precision, so the collision phenomenon cannot be detected.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a method for detecting screen collision before plate-making in mixed printing with different resolutions. insufficient.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

A method for detecting screen collision before mixed printing plate-making with different resolutions is characterized in that:

A. RIP the design draft twice with different resolutions to obtain the first RIP output file package with the first resolution feature and the second RIP output file package with the second resolution feature respectively; the design When the manuscript is printed, it is required that CMYK be printed at the first resolution, the background color should be spot color, and the second resolution should be printed;

B, the CMYK various color RIP output files in the first RIP output file package and the spot color RIP output files in the second RIP output file package are selected and merged to form the third RIP output file package;

C. Use the third RIP output file package for digital proofing, and observe whether the digital sample has the phenomenon of hitting the net.

By adopting the above technical solutions, the present invention can detect whether the mixed printing with different resolutions will have a collision with the screen by means of digital proofing, so that it can be judged in advance whether the printed matter has the problem of collision with the screen at a very low cost, and the generation of defective products can be avoided. , which is conducive to improving the quality of printed products.

Description of drawings

Fig. 1 is the digital sample obtained by the digital printing of the prior art;

Fig. 2 is the printing sample obtained by printing;

Fig. 3 is the partial enlarged schematic diagram of printing sample;

Fig. 4 is a schematic diagram of selecting a resolution for RIP output;

Fig. 5 is that the first RIP output file package includes the schematic diagram of various color RIP output files;

Fig. 6 is the schematic diagram that the second RIP output file package includes various color RIP output files;

Fig. 7 is the schematic diagram that the 3rd RIP output file package includes various color RIP output files;

Figure 8 is a digital sample obtained by the method of the present invention.

Detailed ways

The design draft of this embodiment also uses the following screen angles before printing: CMYK adopts flexo printing conventional screen angles: C: 67.5°, M: 37.5°, Y: 82.5°, K: 7.5°; Purple as the background color) and K at the same angle: 7.5°, the number of plate-making lines is 100L.

The design draft is RIPed twice, the resolution of the first RIP processing is 2540dpi, and the first RIP output file package is obtained; the resolution of the second RIP processing is 4000dpi, and the second RIP output file package is obtained.

Select the CMYK color RIP output files (with a resolution of 2540dpi) of the first RIP output file package and the purple bottom RIP output files (with a resolution of 4000dpi) in the second RIP output file package, and put them into a new file package to merge into the third RIP output file package.

Use the third RIP output file package for digital proofing, and observe whether the digital sample has the phenomenon of hitting the net. As shown in Fig. 8, the digital sample also has the phenomenon of hitting the net in the mixed area.

Through the detailed description, it can be seen that the present invention can detect whether the mixed printing of different resolutions will have a collision with the screen by means of digital proofing, so that it can be judged in advance whether the printed matter has the problem of collision at a very low cost, and the defectiveness can be avoided. The production of products is conducive to improving the quality of printed products.

However, those skilled in the art should realize that the above embodiments are only used to illustrate the present invention, not to limit the present invention. Changes and modifications of the examples will fall within the protection scope of the claims of the present invention.

Claims (1)

1. a different resolution mixed printing plate-making method for collision detection, is characterized in that: A. RIP the design draft twice with different resolutions to obtain the first RIP output file package with the first resolution feature and the second RIP output file package with the second resolution feature respectively; the design When the manuscript is printed, it is required that CMYK be printed at the first resolution, the background color should be spot color, and the second resolution should be printed; B, the CMYK various color RIP output files in the first RIP output file package and the spot color RIP output files in the second RIP output file package are selected and merged to form the third RIP output file package; C. Use the third RIP output file package for digital proofing, and observe whether the digital sample has the phenomenon of hitting the net.

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