First, not shiny, bright enough

Main reasons:

1.UV Oil viscosity is too small, too thin coating.

2. Ethanol and other non-reactive solvent excessive dilution.

3.UV uneven coating of oil.

4. Too absorbent paper.

5. Anilox too small and inadequate supply.

The solution: According to the paper where appropriate to improve the different UV Varnish viscosity and coating weight. Strong absorption of the infiltration of the paper may be coated layer.

Second, dry well, not completely light-cured, tacky surface

Main reasons:

1. UV intensity enough.

2. UV lamp aging, the strength decreased.

Oil storage 3.UV too long.

4. Not to participate in the response of the diluent by adding too much.

5. The machine too fast.

Solution: curing speed in less than 0.5s, the need to ensure that high-pressure mercury lamps not less than the power of the general 120w/cm, tubes to update, do not change, such as broken. If necessary, by adding a certain amount of UV Varnish curing accelerator to speed up the drying.

Third, printed UV varnished surface is not coated,

Main reasons:

Oil viscosity 1.UV small, thin coating.

2. Ink transfer ink containing oil or dry oil too much.

3. Ink has surface crystallization.

4. Ink anti-surface materials (silicone spray) and more.

5. Glue network roll too small.

Solution: require UV coating on printed products must take appropriate measures to create conditions on the UV Varnish coating thickness when the more appropriate and, if necessary, through the Special Oil or replacement to solve the problem.

D, UV coating white coating and pinhole

Main reasons:

1. Coating too thin.

2. Anilox too small.

3. Non-reactive diluent (such as ethanol) by adding excessive.

4. The surface of dust and other printed matter more.

Solution: print production environment and should be kept clean surface to increase the coating thickness. Can be added to the small amount of additive smoothing. The best response to the use of dilution involved in the reactive diluent.

V. uneven surface coating, and the phenomenon of stripe and orange peel

Main reasons:

Oil viscosity is too high 1.UV.

2. Coating roller is not smooth too rough.

3. The pressure of uneven size.

4. Coating excessive.

Varnish 5.UV poor leveling. The solution: reduce the UV Varnish viscosity, reduce the coating weight. Uniform pressure adjustment. Roller coating should be ground, polished. Can be added to the amount of light leveling agent.

6, UN Oil poor adhesion

Main reasons:

1. Printed ink surface crystallization.

2. Printing ink in the supplementary material inappropriate.

Oil 3.UV lack of adhesion itself.

4. Photocurable inappropriate conditions.

Solution: the printing process to consider in advance the conditions of polishing. The need for printed products to enhance adhesion of painted.

7, UV Varnish, there are gel phenomenon

Main reasons:

Oil storage 1.UV too long.

2. Oil has not been fully and dark storage.

3. Storage temperature too high.

The solution: pay attention to the effective use of UV Varnish and strictly dark storage period. Storage temperature to 5 ℃ ~ 25 ℃ appropriate.

8, residual smell great

Main reasons:

1. Dry curing is not complete.

2. UV lamp aging or inadequate.

Oil 3.UV poor antioxidant interference.

Africa Oil 4.UV reactive diluent by adding too much.

Solution: UV Curing Varnish must be thoroughly dry. And to enhance the ventilation, if necessary, replace the UV Varnish varieties.