Irregular printing process will cause insufficient durability of the printing plate. During the printing process, it will be affected by many factors, which will damage the printing plate and reduce its durability:

1. Printing pressure: Printing pressure refers to the mutual force between the embossed bodies during the printing process, which will inevitably bring about compressive deformation, speed difference and friction, and destroy the original structure and adsorption performance of the layout. The first is the cylinder pressure, that is, the pressure between the plate cylinder and the rubber cylinder. If the pressure is too large, it will increase the friction between the plate and the rubber, and the sand on the surface of the plate will gradually wear out, making the dots of the graphic part of the plate Damaged, resulting in a reduction in printing durability of the printing plate. Once again, the pressure between the ink roller, that is, the pressure between the ink roller and the water roller, especially the pressure between the plate ink roller and the plate water roller and the printing plate, if the pressure between them and the plate is too large, It will increase friction and damage the dots of the printing plate, resulting in "plate-off".

2. Fountain solution: The purpose of fountain solution is to maintain the balance of the blank part and the graphic part, protect the blank part of the printing plate from the ink, and not allow it to extend to the graphic part. In printing, when the general printing plate ink film is 3pm, the water film is 1lAm to completely prevent the ink from expanding the blank part. If the amount of plate fountain solution is too large, ink emulsification is likely to occur, the color density of the blotting ink does not meet the requirements, and the degree of corrosion of the plate base is deepened; the printing plate "pasting" and "stacking ink" affect the printing quality.

3. The surface of the substrate appears rough, powdered, and brushed, and sand is included in the paper. During the printing process, these substances will increase the pressure, accelerate the wear of the graphic parts of the printing plate, and reduce the printing plate durability.

4. Some ink pigment particles are relatively coarse, such as gold and silver powder ink and white ink. In the ink transfer process, it will increase the friction coefficient between the printing plate and the blanket, accelerate the wear of the graphic part, and produce a "pattern".

5. The graphic part of the printing plate keeps enough residual ink layer to prevent the graphic from directly contacting the fountain solution and protect the graphic part of the printing plate. If the remaining ink layer in the graphic part is insufficient for a long time, the photosensitive layer will be directly abraded or eroded by acids and alkalis, which will easily cause the "pattern" phenomenon and greatly reduce the printing plate's durability.

6. The impact of printing machinery and equipment caused failures on durability: part of the reason is closely related to the improper operation of the equipment. For example, due to improper installation of the machine, the printing speed is too fast, and the printing pressure is too large, causing the machine to vibrate, which will accelerate the wear of the printing plate during printing. The bushings at both ends of the rubber cylinder are seriously worn, causing the rubber cylinder to jump during printing, which will inevitably cause plate wear and reduce its service life.

7. The rubber cloth is aged for a long time, the rubber becomes hard and loses its elasticity, the fat-sensing ability is reduced, the ink transfer performance is poor, the printed graphics and ink are light, and the printing plate wear is accelerated.

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