Printing skills of Pu thick board paste

 

1. screen printing

 

Do Pu thick version of mesh mesh to low, high tension. In case of machine printing, several thick screen plates can be used at one time, with low mesh as the base and high mesh as the cover. In this way, the thickening speed is fast, and the mesh caused by low mesh can be solved, so as to obtain a smooth thick glue effect on the surface.

 

2. Wire distance, scraper

 

The size of the screen distance, the strength of the return scraper and the hardness, angle, strength and speed of the printing scraper are also factors that affect the printing effect. The size of the screen spacing will have a direct impact on printing, especially when printing thick plate. During production, the network distance can be adjusted according to the actual situation. Under normal circumstances, when printing a thick plate, the front screen spacing is lower and the back screen spacing increases gradually, but the screen spacing cannot be too large, otherwise the screen will be easy to deform, and the printed pattern will play a role of reducing. The mesh distance is determined by the height of the glue printed on the previous screen. Adjust the mesh distance according to the surface thickness of the glue. When drying the screen, the screen should also reach a certain tension, so as to achieve satisfactory results.

 

3. temperature

 

In the flash drying position, do not dry too much, with the glue surface is not sticky. Excessive drying may lead to separation between the offset printing layer and the printing layer. In large furnace for thermosetting, the effect of thick plate is generally longer than that of ordinary printing. Generally, the plasticization requirements can be reached at 130 ℃ - 140 ℃.

 

However, in actual operation, the equipment used by each printing worker is different, which should be determined according to their own actual situation. Carry out small sample test before production to produce large goods.