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There are many processes in printing. To get a good print, there must be no problem in every process. Conversely, if there is a process that has a flash, it is impossible to obtain high-quality prints. If the printing process is subdivided, there are scanning, group making, filming, proofing, printing, printing, and the like.
The group version is an important process for image and text mixing. Standardization and standardization of the group version is an effective means to ensure and improve quality. The impact of this process on quality is mainly reflected in:
1 text, picture, color block, gradual operation is not standardized, so that the layout is too crowded or too loose to affect the overall beauty.
2 Due to the difference in visual effects between the screen effect and the resolution and color mode used in actual printing, the printing effect does not match the imagination.
3 Overprinting is performed by a multi-color fit with a smaller font size or thin line.
4 directly use the RGB format group version to make the picture black and white.
5 Pull the picture during the grouping process to make the picture poor and the output slow. In particular, magnifying the picture has a great effect on the picture. Therefore, the group version should be strictly in accordance with the requirements of standardization and standardization. If the picture must be in CMYK format, the picture size should be changed in Photoshop. Do not pull or deform, and the picture, text block and color block spacing should be standardized; the kerning of the text should not change, making the layout beautiful.
The film, also called output, includes several processes such as RIP hairline, photo-exposure film exposure, and rinsing and inspection. Controlling this process with data and standardization is an important means of ensuring quality. The main impact of this process on quality is:
1 The text is thick and fat due to the linearization of the output film, the printing effect is too dark, the picture color deviation and the layer reproduction are not good, and the color of the color block is deviated.
2 Due to the exposure of the film and improper washing conditions, the bottom of the film is too large and the density is insufficient. Reflected in the layout is the dirty face, the field is imaginary, the low-key network level is lost, the net, the paste network.
3 Due to the high or low number of screens, the picture is ruined, and the picture is poor.
4 The moiré and color appear poorly due to improper screening angle.
5 The overprinting error and the rule line appear too thick due to the low positioning accuracy of the film, resulting in imposition error.
6 Different layouts of the inconsistent appearance of the parameters are different.
7 Due to improper operation such as washing and inspection, scribes, horseshoe prints, and dirty marks are directly reflected on the surface of scratches, imaginary marks, and dirty surfaces.
Therefore, the following points should be noted during the film output process:
1 Data control is the basis for good film output process control and quality assurance. The data control of the film output has two aspects. One is to ensure the accuracy of the output network, the dot error should be controlled within 2%; the second is the bottom ash after the film is output, the maximum density value meets the requirements, and the bottom ash (D.) should be Less than 0.04, the maximum density Dmax ≥ 3.0. This requires a series of tests on the exposure and rinsing process of the film to find a set of accurate system parameters, and adjust the different batches of raw materials at different times. For different films, through trial and multiple linear adjustments, the film meets the above requirements.
2 Careful operation and careful adjustment. Standardized operations are an important step in ensuring the quality of the output. In the output, it is necessary to ensure that the parameters of each layout are consistent, the number of screen lines meets the printing requirements, the mesh angle does not produce the moiré, and the four-color version repeats the positioning accuracy within 25 μm. The registration cross position, size, and thickness are uniform.
After the completion of the filming task, it is necessary to proof. Proofing has two types of digital proofing and analog proofing. The quality of the film directly determines the effect of the proofing, so how is the film going out, and it has a great influence on the proofing and the printing on the back. Pay attention to the choice of light intensity and exposure time. The solution configuration in the platen machine should also be done as required. Generally, the test can be done first, and then the relevant values are determined.