The external image of commodities is becoming more and more important in the fierce market competition. Color boxes have become an excellent choice for external image packaging of commodities because of their high-end, exquisite and beautiful appearance. Color boxes are not only light in weight, easy to carry, and have a wide range of raw materials, but also have excellent quality. Environmental protection. This article shares 8 factors that affect the quality of color box printing, divided into the first part and the second part.

1. The influence of film

The developing and fixing process of film film after exposure is directly related to the clarity and contrast of the image on the film. Therefore, for 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. The higher the density, the greater the contrast, the better the quality of the plate-making film, and the printing quality of the printing plates produced with it can be guaranteed. In addition, the thickness of the plate-making film base also affects the quality of the plate-making. Generally, thin films have better effects than thick films.

2. The impact of printing

During the printing process, the intensity of the light source, the distance between the light source and the plate, and the length of the exposure time will all affect the printing quality. The light source is strong, the distance is short, and the exposure time is relatively short; the light source is weak, the distance is long, and the exposure time is relatively long. Under a certain light source and distance, as the exposure time increases, the decomposing part of the plate material that is exposed to light will intensify, until the surface of the exposed part of the coating is completely decomposed. If the exposure time continues to increase, the edge of the medicated film surface that is not exposed to light will gradually decompose due to the radiation of strong light, so that the graphic lines of the printed plate produced will become thinner, even broken, and blurred. . If the exposure time is not enough, the surface of the non-graphic part will not be completely decomposed. After the printing plate is developed, the non-graphic part still has the medicine film, which will be dirty when printing on the machine. In addition, different brands of printing plates require different exposure times, which must attract people's attention.

In addition, when the printing plate is vacuumed, the degree of adhesion between the film and the printing plate also affects the quality of the printing plate. If it is not adhered firmly, the printed plate may have problems such as ghosting and blurring.

3. The effect of development

Developer concentration
If the concentration of the developer is too large and the development is too fast, it is easy to cause excessive development of the printing plate, thinning of the graphics and text, loss of small dots or faint graphics and text, which will affect the printing quality of the color box; The film surface is not easy to clean, and the plate is easy to get dirty when printing on the machine.

Development time

If the development time is too long, the medicated film surface of the printing plate that is not exposed to light will be easily dissolved, and the graphic of the printing plate will become lighter and thinner, resulting in untrue and unclear imprints during printing; if the development time is too short, the medicated film will be decomposed by light. The surface is not easy to be completely removed, and it is easy to get dirty during printing. The proper development time is when the printing plate is washed after development, the medicated film surface that sees light decomposition is just washed out. If the concentration of the drug solution is relatively large, the development time should be shortened accordingly; otherwise, the development time should be extended accordingly.

4. The influence of ink transfer

The printing process is actually the process of ink transfer. Generally speaking, the ink transfer rate of offset printing is relatively low, about 38%. After the printing plate is inked with the blanket, the ink transfer rate is about 50%, and when the blanket contacts the paper, the ink transfer rate is about 76%. Therefore, it is very important to control the transfer rate of the ink. Ink suitability, ink balance, printing plate, blanket performance, paper, printing machine, etc. will all affect the transfer of ink.