The cause of printing dot loss or defect ?

Generally, the causes of the failure are:

1. Ink viscosity is too high;
2. Is ink film drying too fast;
3. Is the ink has particles;
4. Ink flow is too poor;
5. Is insufficient printing pressure;
6. Is the printing plate sleeve circumference uneven, not smooth and so on.

Treatment methods:

• First, ink viscosity should be adjusted between 25~30 S/25℃· coating 4 cups;
• Second, ink in printing to add slow dry diluent;
• Third, to prevent ink premature drying in the printing plate hole (add wetting aids);
• Fourth, add 1%~3% flattening (e.g. ether) or adjust printing pressure, so that its substrate tension control at 0.05;
• Fifth, change or polish printing plate surface.