UV Printing FAQ Analysis and Resolution (1)

main reason:

1. UV Varnish viscosity is too low and the coating is too thin.

2. Ethanol and other non-reactive solvents are diluted in excess.

3. UV oil coating is not uniform.

4. The paper is too absorbent.

5. The anilox roller is too thin and the fuel supply is insufficient.

Solution: Appropriately increase the viscosity and coating amount of UV varnish according to different conditions of the paper. For osmotic and absorbent paper, a primer layer can be applied first.

Second, poor drying, light curing is not complete, the surface is sticky

main reason:

1. UV light intensity is not enough.

2. UV lamp aging, strength weakened.

3. UV light oil storage time is too long.

4. Do not add too much diluent to the reaction.

5. The machine speed is too fast.

Solution: In the case of a curing speed requirement of less than 0.5s, it must be ensured that the power of the high-pressure mercury lamp is generally not less than 120W/cm, the lamp should be updated in time, and do not wait for the bad to change. If necessary, add a certain amount of UV varnish curing accelerator to accelerate drying.