During the printing process, the uniform flat net on the printing plate cannot be leveled due to the ink, and the dots appear separately, forming a filter mesh shape, and even a dot defect occurs.
cause:
1 The ink viscosity or yield value is too high, resulting in poor ink transferability.
2 The ink dries too fast, is not evenly distributed on the printing plate, and solidifies and solidifies prematurely.
3 The wettability between the ink and the printing plate is poor (the surface tension does not match), and the transferred ink is not easy to spread.
4 The pressure of the doctor blade is large, and the pressure of the printing roller is insufficient.
5 The plate network cable is too thick, the cell spacing is large, and the ink is not easy to spread.
solution:
1 Reduce the viscosity of the ink and improve the transferability of the ink. It is recommended to use 20# additive for gravure ink.
2 Adjust the position of the doctor blade to shorten the distance between the doctor blade and the plate cylinder.
3 Use slow drying solvent to reduce the drying speed of the ink and increase the dot gain rate.
4 Adjust the blade pressure and the pressure of the printing roller.
5 Re-plate to change the shape and angle of the cells.
6 Use low viscosity inks.
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