[Points to watch] In the printing process, sometimes very small intermittent scratches on the ink layer phenomenon. It is not easy to find in the boot process, but for the printed products of compound milky white film, the hidden danger is great. Here we analyze the reasons and solutions for this phenomenon for your reference.
Reasons for small intermittent scratches on the ink layer:
1. The brush guide roller and cooling roller are not flexible.
2. There are ink stains on the guide roller and cooling roller.
3. The ink that produces the scratch is not completely dried.
4. Poor adhesion of ink.
5. The adjustment of the supply and exhaust air volume in the drying box is inappropriate, and the printed film may suck on the air box during the printing process.
Solution:
1. Check the printed film unit by unit after shutdown to find the general location of the scratches. For the colors that are overprinted, you must carefully check and analyze the color of the scratches.
2. If there are scratched units, check whether the guide roller and cooling guide roller rotate flexibly and whether the guide roller and cooling roller are clean.
3. Adjust the solvent ratio of the ink or check the oven temperature or reduce the speed to ensure that the ink is completely dry.
4. Adjust the air supply and exhaust in the air box, make the film run on the guide roller of the air box, and prevent the phenomenon that the amount of air exhaust is much larger than the air supply. Otherwise, in addition to the printing film rubbing the bellows, which may easily cause scratches on the ink layer, the actual temperature in the drying bellows may be lower, which may affect the drying effect of the printed ink layer. This problem is easy to ignore during the printing operation. Often the operator only pays attention to whether the set temperature is reached, and does not expect that the temperature displayed by the thermometer is the temperature of the air inlet. The actual temperature in the oven is not only the same as that displayed on the thermometer Temperature has a relationship, and it also has a great relationship with whether the intake air volume and exhaust air volume match.
5. Contact the ink supplier or replace the ink supplier to improve the adhesion between the ink and the printed film and the scratch resistance of the ink.
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