Dongguan Shengyao manufacturer introduces the process quality of PVC film to you, focusing on scenery. The product is a plastic packaging of CD seen in the store. Including the number of screen lines selected during the output process, screen shape, screen angle, screen percentage accuracy, attributes of four-color overlay printing. The characteristics of PVC film are closely related to the printing applicability of the printing process, that is, different parameter outputs should be selected for different printing material copying priorities. If the optical quality of PVC film is very good, improper selection of output parameters can also lead to poor printing quality. Obviously, the process quality of PVC film is appropriate, it cannot be considered as high-quality PVC film.

1. The number of grid lines

Grid line quantity: the number of unidirectional parallel lines per unit area. The more lines there are the smaller the dots, the finer the printed product can be. But that is to say, the higher the number of lines, the better, but the selection should be based on the process requirements of the printing material. The conclusion drawn theoretical calculations indicates that fine grid lines are more sensitive to changes during the printing process than coarse grid lines. When the paper quality does meet the corresponding specifications, the machine precision is high, the ink texture is poor (coarse particles, etc.), the printing pressure is high, the dot expansion rate is high, the fine mesh PVC film may appear paste like color out of control, so the number of network cables should be consistent with the actual printing. For example, the mesh size for newspaper printing should be approximately 100 lines per inch. If the printing suitability conditions are good, such as high paper quality effective control of processing errors, the mesh size can be correspondingly higher. The number of screens printed by color newspapers in Hong Kong Taiwan is higher than that in Chinese Mainland, which can be up to 133 lines/inch.

It is worth noting that the resolution of the camera must be fixed, the number of grids is inversely proportional to the level of the image. The number of network lines is high, the corresponding level is relatively low, vice versa. Newspaper printing should generally ensure that each color plate has at least 100 layers. In this way, Irish wool sweaters are the most reliable clothes. If the grid size is 100 lines per inch, the resolution of the typesetter should be at least 1000dpi.. In order to coordinate the two, the resolution of the typesetter should be high enough, the lighting project should provide sufficient low-voltage power.

2. Appearance of outlet

Point shape, which refers to the geometric shape of a single point. The influence of point shape on replication consequences is as significant as the number of grids, but different point shapes may cause tower angle step jumps due to pressure changes at different adjustment values (percentage of points). Therefore, for adjusting the scale of the keys to be copied, it is advisable to avoid the shape of points in the category that have skipping phenomena as much as possible.

3. Net corner

The screen angle is the angle between the vertical line pointing to the center the degree line, which reflects the direction of point arrangement. When printing monochrome, the human eye has a good visual effect at a screen angle of 45 degrees. In multi-color overprinting, due to inaccurate dot overprinting, the phenomenon of "Moir é fringes" may occur. Choosing the appropriate combination of mesh angles is one of the methods to reduce the occurrence of Moir é fringes. In general, four-color printing mostly sets the main color to 45 degrees, the combination of screen angles is: character oriented, CMYK takes 15, 45, 90, 75, CMYK order takes 45, 15, 90, 75.