Plate making is required before printing. Plate making is the original copy of the printing plate collectively. In plate making, the factors affecting plate quality are the most.
1. The blank part of the printing plate is blocked
1, the back exposure time is too long, should pay attention to the correct control of the back exposure time;
2, the main exposure is excessive, on the premise of ensuring the reproduction of small text, fine lines, try to shorten the main exposure time;
3, plate and film contact is bad, should ensure that the vacuum system works normally, and use the roller to remove the air between plate and film.
Two, small dot, small print, fine lines are washed off the fault
1, the back exposure time is not enough, to consider increasing the back exposure time;
2. If the time of main exposure is not enough, the time of main exposure can be increased;
3, the washing time is too long or the brush pressure is too large, we should pay attention to shorten the washing time and adjust the pressure of the brush.
Three, when printing small dot loss fault
1, the main or back exposure is insufficient, can increase the main exposure or back exposure time;
2. The design of the original manuscript is beyond the scope of flexo printing reproduction ability, improve the design of the original manuscript, make it suitable for the scope of flexo printing technology.
Four, the bottom of the plate is not completely hardened fault
1. Insufficient back exposure, increase back exposure time;
2, washing is not complete, there are residual unhardened resin retained, check the brush pressure and adjust the washing time.
Faults in plate making (II)
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