Five factors that affect the quality of offset printing

First, the impact of film on print quality

The process of developing and fixing the film after exposure directly relates to the sharpness and contrast of the image on the film. Therefore, for the plate-making film, the key is to look at the density of the graphic part and the contrast between the graphic part and the non-graphic part.

Second, the impact of printing on print quality

During the printing process, the intensity of the light source, the distance from the source to the plate, and the length of the exposure time all affect the printing quality.

Third, the development of the print quality

1. Developer concentration

The developer concentration is too large, the development is too fast, it is easy to cause overprinting - plate - excessive development, graphic lines become fine, small dots or light and thin graphics are unclear, affect the quality of printing [encyclopedia microblogging]; developer concentration is too small, See the decomposition of the drug film surface is not easy to clean, easy to dirty version on the machine printing.

2. Development time

If the development time is too long, the film surface where the printing plate is not exposed to light will be easily dissolved, and the printing plate image will become light and thin, resulting in false printing and unclear printing; the development time is too short, and the photolysis film is too short. It is not easy to completely remove the surface and it is easy to get dirty when printing. The proper development time is the printing-printing-developing rinse, and the photo-degraded film surface is just flushed. If the concentration of the liquid is relatively large, the development time should be shortened accordingly; otherwise, the development time should be extended accordingly.

Fourth, the impact of ink transfer on print quality

The printing process is actually the process of ink transfer, and controlling the ink transfer rate is very important. The impact of ink transfer on print quality includes five aspects: the effect of ink performance on ink transfer, the effect of blanket performance on ink transfer, the influence of paper and plate suitability on print quality, and the balance between ink and ink The impact of print quality and the effect of printing pressure on print quality

Fifth, the impact of the post-press process on product quality

The impact of the post-press process on product quality is mainly reflected in the size of the product specifications, whether the pages are incomplete, and whether the order is reversed. Whether the binding is firm and the appearance is beautiful. The post-printing process is also a process that cannot be ignored in the entire printing process.

There are many factors that affect the quality of printed products. However, from the process point of view, the above-mentioned several major factors are more likely to bring about quality problems. By understanding these factors and controlling them, you can ensure the quality of your prints, reduce the number of unqualified products you can avoid, reduce printing costs, and increase your competitiveness.