During the printing process, the dots on the printing plate shrink, empty, and disappear, which leads to the disappearance of small lines and text in graphics and text. This phenomenon is called a flower plate. The pattern is one of the most common faults, and it will occur repeatedly. When the pattern occurs, the high-profile fine dots will soon be lost. Therefore, in the field printing, this kind of blooming phenomenon will also occur due to the destruction of the oleophilic foundation of the printing plate.
The reason for the pattern: 1. The amount of fountain solution is too large; 2. The pattern is easy to appear when the pressure is too small, but it is easy to wear the plate after the pressure adjustment is too large, and the printing pressure is adjusted reasonably according to the technical requirements; Factors of liquid acidity; 4. Improper adjustment of water and ink rollers or aging and deformation of water and ink rollers are also prone to patterns; 5. Caused by uneven surface or uneven color of the substrate.
The flower version needs to be discovered in time, find out the reason, and take corresponding measures can be completely avoided.
As another kind of printing failure, paste printing is also often encountered. It is characterized by expanded deformation of the layout dots and adhesion to each other, which makes the level of the printed matter unclear. After paste failure occurs, scrub with an appropriate solvent for the nature of the ink. When scrubbing, pay attention to start from the printing surface, and wipe gently from the middle to the periphery. Check the printing plate after wiping, if there is any defect, it should be repaired in time, and printing can be restarted after repairing.
The reasons for the pasting are: 1. Poor water control; 2. Too much ink delivery and too thin ink; 3. Too much printing pressure. There are several treatment methods: 1. Add ink to the ink; 2. Increase the amount of water supply, especially the acid value of the potion; 3. Use a high concentration of ink, try to make the print as thin as possible; 4. Use higher Potion of surface tension; 5. Adjust the pressure between the printing plate and the rubber roller; 6. Reduce the desiccant; 7. Replace the faster drying resin ink.
As the common faults in the printing process, flower plates and paste plates must be discovered and solved in time by operators. This is the most effective way to ensure product quality and reduce the scrap rate.
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