First, the gloss is not good, the brightness is not enough
main reason:
1. The viscosity of UV varnish is too small, and the coating is too thin.
2. Excessive dilution of non-reactive solvents such as ethanol.
3. UV oil coating is uneven.
4. The paper is too absorbent.
5. The anilox roller is too thin and the oil supply is insufficient.
Solution: Properly increase the viscosity and coating amount of UV varnish according to different conditions of paper. For paper with strong permeability, a layer of primer can be applied first.
Second, poor drying, incomplete light curing, and sticky surface
main reason:
1. The ultraviolet light intensity is not enough.
2. The UV lamp is aging and its intensity is weakening.
3. UV varnish storage time is too long.
4. Add too much diluent that does not participate in the reaction.
5. The machine is too fast.
Solution: In the case of curing speed requirements 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 tube should be updated in time, and do not wait for it to be damaged before replacing. If necessary, add a certain amount of UV varnish curing accelerator to accelerate drying.
3. The UV varnish on the surface of the printed matter will not rise or bloom
main reason:
1. UV varnish has low viscosity and the coating is too thin.
2. The ink contains too much ink or dry oil.
3. The surface of the ink has crystallized.
4. There are many anti-sticking materials (silicone oil, powder coating) on ​​the surface of the ink.
5. The glue roller is too fine.
Solution: When printing products that require UV glazing, appropriate measures must be taken to create conditions. When UV varnish is applied, it should be thicker. If necessary, the problem can be solved by applying primer or replacing special varnish.
4. UV coating has white spots and pinholes
main reason:
1. The coating is too thin.
2. The anilox roller is too thin.
3. Too much non-reactive diluent (such as ethanol) is added.
4. The surface of the printed matter is dusty.
Solution: The production environment and the surface of the printed matter should be kept clean and the coating thickness should be increased. A small amount of smoothing aid can also be added. For dilution, it is best to use reactive diluents that participate in the reaction.
5. Uneven coating on the surface, streaks and orange peel
main reason:
1. The UV varnish viscosity is too high.
2. The coating roller is too coarse and not smooth.
3. The pressure is uneven.
4. The coating amount is too large.
5. UV varnish has poor leveling properties.
Solution: reduce the viscosity of UV varnish and reduce the amount of coating. The pressure is adjusted evenly. The coating roller should be ground and polished. Light leveling agent can be added.
Six, UV varnish adhesion is not good
main reason:
1. Crystallization of printed ink surface.
2. The auxiliary materials in the printing ink are not suitable.
3. The UV varnish itself has insufficient adhesion.
4. Light curing conditions are not suitable.
Solution: The printing process should consider the glazing conditions in advance. The printed product needs to be coated with primer to enhance adhesion.
7. UV varnish thickens and gels
main reason:
1. UV varnish storage time is too long.
2. Varnish cannot be stored away from light.
3. The storage temperature is too high.
Solution: Pay attention to the effective use period of UV varnish and store it strictly in the dark. The storage temperature is preferably 5 ℃ ~ 25 ℃.
8. Large residual odor
main reason:
1. Incomplete drying and curing.
2. In addition, the light source is insufficient or the lamp tube is aging.
3. UV varnish is poor in anti-oxidation interference.
4. Excessive addition of non-reactive diluent in UV varnish.
Solution: UV varnish must be dried and cured thoroughly. And to strengthen ventilation, if necessary, replace the UV varnish varieties.
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