Pinhole phenomenon in glass screen printing

The pinhole phenomenon is the most headache problem for workers engaged in glass screen printing. The causes of pinholes are also diverse, many of which are inexplicable, and some are still quality management issues. Pinhole is one of the most important inspection items in printing product inspection Dust and foreign objects attached to the plate. During plate making, there will be some sol mixed in during water washing and development. In addition, during emulsion coating, dust can also mix in and attach to the wire mesh, resulting in pinholes. During the experiment, if attention is paid to inspection, these can be discovered and promptly repaired. If dust and foreign objects adhere to the screen, blocking the opening of the screen can also cause pinholes. Before formal printing, it is necessary to carefully inspect the screen printing to eliminate any dirt on the plate; ② Cleaning of glass surfaces. Before printing, glass panels should undergo pre-treatment to ensure their surface is clean before printing. If the glass is not printed immediately after treatment, it will be contaminated again. After pre-treatment, dirt such as grease can be removed, and dust adhering to the surface can also be removed. Special attention should be paid to the fact that when moving glass by hand, the fingerprints of the hand will also adhere to the printing surface, forming pinholes during printing.