When printing on aluminum-plated film or registering on white ink graphics, pinhole (blank dot / pockmark) failure is often caused by the cohesive force of the foam in the ink or the resin bonding material in the ink system.
The general processing method is:
One is to increase the amount of ink coating;
The second is to add desalting agent to the ink;
The third is to add anti-foaming agent; the fourth is to add thickening and thickening agent;
Five is (gravure printing) the scraper moves up a bit;
Sixth, add a stirrer to the ink fountain;
Seven is reprinted once;
Eighth, the resin with less cohesion is used as the connecting material of the ink;
Nine is to level well and antistatic ink or slow down the printing speed, and strive to achieve the purpose of eliminating the faults of pits, pinholes, spots, and white spots.
China Xuchang Wig Co., Ltd , https://www.hairxuchang.com