Disadvantages of worn parts of plate and text
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Under the effect of surface friction, the graphic part of the printing plate will also be worn out. After the graphic part is worn out, the first drawbacks are: "flower" is emitted at high light and "paste" is generated at dark tone. Because the area of ​​the blank on the high-light area of ​​the printing plate is much larger than the area of ​​the picture and text, once the dot foundation of the high-light area is worn, it can easily be encroached by the surrounding dampening fluid and become the foundation of the hydrophilic and oleophobic, making the high-light area. Already tiny sites have become smaller or have lost. At the dark tone, on the other hand, the graphic area of ​​the printing plate on the dark tone is much larger than the hydrophilic blank area. If the abrasion of the blank part on the printing plate will cause poor hydrophilicity, it will be easily spread by the surrounding ink. Extending outlets and creating "sticking" phenomenon