Reasons and exclusion of the phenomenon of missing pages in the printing process

In the process of printing, there are often version failures, and some operators are indiscriminate. All of them push the responsibility to the printing process and use the phrase "unable to print" to avoid further investigation. Off-board failures do have a close relationship with the printing plate, such as poor printing plate, insufficient vacuum, and long exposure time. However, the printing plate is not the only cause of failure, and the printing process cannot be ignored. The author summarizes the main reasons and exclusion methods for the off-page failure caused by the printing process.

1. The dampening solution is too acidic and the plate graphic is corroded. Remedy: Increase the proportion of water in the fountain solution.

2. The printing pressure is too large or the lining is too thick and hard to damage the printing plate. Remedy: Reduce printing pressure or replace suitable pad.

3, the water roller or ink roller by plate pressure is too large. Remedy: Reduce the pressure.

4. The water velvet of the water roller wears, and the friction force between the printing plate and the plate increases. Remedy: Replace the glue.

5. The surface of the ink roller is hardened, loses its elasticity, and the friction force between the plate and the printing plate increases, or the difference between the two ends of the ink roller is not equal, resulting in a significant speed difference at both ends. Remedy: Replace the ink roller.

6. The surface of the blanket hardens. Remedy: Replace the blanket.

7, paper powder, paper debris and other impurities too much. Remedy: Clean the plate and blanket.

8, the ink is too sticky, printing pressure caused by peeling force is too large, and even off version. Remedy: Add repelant or 6# ink to reduce ink viscosity. (Author: Wuguo Yong)