1, the old printing without clean.

2. solvent dry fast (printing speed and solvent volatilization rate does not match).

3, dry hot air blow to the screen.scraper and layout of the contact point and pressure
 
4.existing in the printing ink dust, water, air and noise curing, ink transfer rate due to the actual net hole
 
5, the net when plate hole electric carving precision and Angle will shadow.6, to the transfer of ink

6.resulting in the network is not enough or missing7, ink and solvent quality is also causes the plugging
 
version of one of the reasons why, if ink liquidity is bad, printing viscosity is too high, printing ink has spoiled or into different series of ink, the improper solvent or solvent ratio, and even add solvent ink with the improper operation, will affect the ink metastatic, cause plugging edition.