According to the research of the paper "Selection of Photoinitiator for UV Screen Printing Covering Ink and Research on Covering Power" written by Huang Bei of Beijing Institute of Printing and Wang Peimin of Qingshan Shandong Provincial Printing Material Company,
The conclusion shows
1. The type of photoinitiator and silver powder has a great influence on the curing speed of UV ink. To increase the curing speed of UV ink, the photoinitiator should match the absorption of ultraviolet light by the pigment, that is, the absorption peak of the photoinitiator Be within the spectral window of the pigment as much as possible.
2. The content of photoinitiator also has a great influence on the curing speed of UV ink. Increasing the content of photoinitiator can increase the curing speed of UV ink, but the content of too high photoinitiator will reduce the curing speed of UV ink.
3. The type and content of silver powder have a direct impact on the hiding power of the ink. The higher the hiding power, if a small amount of carbon black is added to work with silver powder, the smaller the diameter of the silver powder, the higher the hiding power; the higher the content of silver powder , will significantly improve the hiding power of the ink.
Attached picture
For more information, please refer to "Selection of Photoinitiators for UV Screen Printing Covering Inks and Research on Covering Power"
