Wet weather, humidity, strong static electricity, it needs to check when the edge of the pattern is unclean.
1、 Whether high humidity or low temperature
2、Whether the strength of powder shaking machine is insufficient
3、Whether the printing interval is too long without powder caused by drying glycerin diffusion
4、 Whether ink misting on heads
Solutions
If it is found that the pressure wheel position or large blank area shaking is not clean, it should be electrostatic influence or powder damp or too fine, you can take measures as appropriate.
Generally, increasing the temperature of the heating board after printing and shake powder machine connected board can reduce the edge powder shaken unclear.