Several reasons for the loss of printing plate wear resistance

1. Printing pressure: Printing pressure refers to the mutual force between the stamping bodies during the printing process, which inevitably brings about compression deformation, speed difference and friction, and destroys the original structure and adsorption performance of the printing plate. The first is the drum pressure, which is the pressure between the plate cylinder and the blanket cylinder. If the pressure is too high, the friction between the printing plate and the eraser will be exacerbated. The sand on the surface of the printing plate will gradually wear out, making the dots of the printing plate graphic part Damaged, resulting in reduced printing plate resistance. Again, the pressure between the ink rollers, that is, the pressure between the ink roller and the water roller, especially the pressure between the platen roller and the plate roller and the plate, if the pressure between them and the plate is too large, Will increase the friction, so that the printing plate outlets are damaged, appear "off version."

2. Fountain solution: The purpose of the fountain solution is to maintain the balance between the blank part and the graphic part, protect the blank part of the printing plate from being invaded by the ink, and not allow it to extend to the graphic part. In printing, when the general printing ink film is 3pm, the water film is 1lAm to completely prevent the ink from expanding to the blank part. If the amount of printing plate fountain solution is too large, the phenomenon of ink emulsification is easy to occur, the density of the imprinted ink cannot meet the requirements, and the corrosion degree of the printing plate base is deepened; the “plate stencil” and “stacking ink” of the printing plate affect the quality of the printing product.

3. The surface of the substrate is roughened, loose powder, and napped. Sand is contained in the paper. These substances will increase the pressure during the printing process, accelerate the wear of the printing plate graphic and reduce the printing plate resistance to printing.

4. Some of the ink pigment particles are coarser, such as gold and silver powder inks and white inks, will increase the friction coefficient between the printing plate and the blanket during the ink transfer process, and accelerate the wear of the graphic part, resulting in a “flower pattern”.

5. The printing plate graphic part maintains enough remaining ink layers to prevent the graphic text 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 period of time, the photosensitive layer is directly subjected to abrasion or acid-alkali erosion, which can easily cause a "flower pattern" phenomenon, which greatly reduces the printing plate's resistance to printing.

6. The effect of failure caused by printing machinery and equipment on the resistance to printing force: Part of the reason is closely related to the improper operation of the equipment. For example, due to improper installation of the machine, excessive printing speed, excessive printing pressure, vibration of the machine, and accelerated printing plate wear. The sleeve sleeves at both ends of the blanket cylinder are worn badly, causing the rubber cylinder to jump when printing, which will inevitably cause the printing plate to wear and reduce its service life.

7. Longer aging of the blanket, the rubber becomes harder and loses its elasticity, the ability of the sense of fat drops, the ink transfer performance is poor, and the ink of the printed matter is faded, which accelerates the wear of the printing plate.