In recent years, the flexographic printing method has developed rapidly in China, especially in product packaging, more and more flexographic printing methods have been adopted. However, in the actual production process, due to the influence of printing materials, ink performance, printing machinery, working environment and other factors, some printing failures often occur, affecting the smooth production and the quality of the final printed matter.
Fault
Reasons: 1. The plate relief is too shallow; 2. The printing pressure is too large; 3. The ink supply is too much; 4. The ink viscosity is too high; 5. The ink dries too quickly.
Solutions: 1. Remake the plate, and appropriately reduce the back exposure time, increase the depth of the plate relief; 2. Appropriately reduce the printing pressure; 3. Appropriately reduce the amount of ink supply; 4. Reduce the viscosity of the ink; 5. Reduce hot air drying The speed of the vehicle should be slowed down properly, or an appropriate amount of slow drying agent should be added.
Fault two sticky dirty
Reasons: 1. Insufficient drying of the ink; 2. The viscosity of the ink is too high; 3. The rewinding tension is too high.
Solutions: 1. Increase the drying temperature, or add an appropriate amount of solvent that evaporates quickly; 2. Reduce the viscosity of the ink; 3. Reduce the rewinding tension.
Three sets of faults are not allowed
Reasons: 1. Improper tension; 2. Improper arrangement of printing color groups; 3. Mechanical vibration or mechanical deviation; 4. Uneven printing materials; 5. Improper temperature and humidity in the printing workshop, excessive drying oven temperature, and paper, especially plastic The film shrinks severely.
Solutions: 1. Adjust the unwinding and rewinding tension; 2. Re-adjust the printing color sequence, arrange the color with strict registration requirements in the adjacent color group to print next to each other, in order to prevent deviation, if necessary, you can properly Put another layer or two layers of transparent tape under the double-sided tape; 3. Check the machinery and adjust the corresponding machine parts; 4. Adjust the tension or replace the printing materials; 5. Reduce the drying temperature and try to keep the constant temperature in the workshop, Constant humidity, if possible, install air conditioners in the workshop.
Failure four-fold color is not good
Reasons: 1. Insufficient drying of the former color ink; 2. The viscosity of the latter color ink is too high.
Solutions: 1. Add an appropriate amount of fast-evaporating solvent to increase the drying speed of the previous color ink; 2. Reduce the viscosity of the latter color ink.
Fault five ink blistering
Cause: The printing speed is too fast, and the defoamer is not used or the amount of defoamer is insufficient.
Solution: Add an appropriate amount of defoamer, or appropriately reduce the printing speed.
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