There are many processes in printing. To get a good printed product, there must be no problem in each process; on the contrary, if there is a process that fails, it is impossible to get high-quality printed products. If the printing process is subdivided, there are scanning, group production, film production, proofing, printing, printing and so on.

Group version is an important process for mixing pictures and texts. Group version standardization and standardization are effective means to ensure and improve quality. The impact of this process on quality is mainly manifested in:

â‘  The operation of characters, pictures, color blocks, and gradients is not standardized, which makes the layout too crowded or too loose, which affects the overall beauty.

â‘¡ The difference between the visual effect of the screen effect and the resolution and color mode used in actual printing causes the printing effect to be inconsistent with the imagination.

â‘¢ The small font size or thin lines are overprinted with multiple colors and overprinting ghost appears.

â‘£ The RGB format is used directly to make the picture black and white.

⑤ In the process of group version, the picture is pulled and pressed to make the picture poor, and the output is slow. Especially enlarge the picture, it has a great influence on the picture effect. Therefore, the group version should strictly follow the requirements of standardization and standardization. If the picture must be in CMYK format, the size of the picture should be changed in Photoshop. Do not stretch, compress, or deform. The spacing between pictures, text blocks, and color blocks should be standardized and unified.

Film output, also known as output, includes several processes, such as RIP development, photo-exposure film exposure, processing, and inspection. Controlling this process with data and standardization is an important means of ensuring quality. The impact of this process on quality mainly includes:

â‘  The text becomes thick and fat due to the poor linearization of the output film, the printing effect is too dark, the image color deviation and the poor reproduction of the gradation, and the color block color deviation.

â‘¡ The bottom of the film is too large and the density is insufficient due to the exposure of the film and improper processing conditions. It is reflected in the layout that the layout is dirty, the field is false, the low-key dot level is lost, the net is dead, and the net is pasted.

â‘¢ The picture is pasted, extinct, and the picture layer performance is poor due to the high or low screen mesh.

④ The moiré and color performance due to improper screen angle are poor.

⑤ Due to the low positioning accuracy of the film, the overprint error and the rule line are too thick, which leads to the imposition error.

â‘¥ The effect of different layouts that appear inconsistently before and after the phototypesetting parameters is different.

⑦ Scribing, horseshoe marks, dirty marks, etc. due to improper washing and inspection operations are directly reflected on the layout as scratches, virtual dots, dirty layouts, etc.

Therefore, the following points should be noted in the process of film output:

① Digitalized control is the basis of good film output process control and quality assurance. The digital control of film output has two aspects: one is to ensure the accuracy of the output dots, and the dot error should be controlled within 2%; the second is the bottom gray after the film is output, the maximum density value meets the requirements, and the bottom gray (D.) should be Less than 0.04, the maximum density Dmax≥3.0. This requires multiple tests on the exposure and processing of the film to find a set of accurate system parameters, and to adjust different batches of raw materials at different times. For different films, through tests and multiple linear adjustments to make the films meet the above requirements.

② Careful operation and careful adjustment. Standardized operation is an important step to ensure output quality. 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 screen angle does not produce moire, the repeat positioning accuracy of the four color plates is within 25 μm, and the registration cross position, size and thickness are uniform.

After completing the filming task, it is time to proof. There are two types of proofing, digital proofing and analog proofing. The quality of the film directly determines the effect of the proofing, so how well this film is produced has a great influence on the proofing and the subsequent printing. Printing should pay attention to the choice of light intensity and exposure time. The solution configuration in the processor should also be done according to the requirements. Generally, you can do the test first, and then decide the relevant value.

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