UV glazing is UV glazing. It is a special coating agent for UV, which is applied to the performance or local area of ​​the printed matter precisely and evenly. It is dried and hardened at a very fast speed by ultraviolet irradiation.

Generally, export products are not allowed to be coated, so UV coating is a very suitable treatment. So, what problems do we need to pay attention to during the UV glazing process? What are the solutions?

Poor gloss and insufficient brightness

main reason:

1. The viscosity of the UV varnish is too small and the coating is too thin;

2. Excessive dilution of non-reactive solvents such as ethanol;

3. Uneven coating;

4. The paper is too absorbent;

5, the rubberized anilox roller mesh is too thin, the oil supply is insufficient.

Solution:

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

Poor drying, incomplete curing, sticky surface

main reason:

1. The intensity of ultraviolet light is insufficient;

2. The UV lamp is aging and the light intensity is weakened;

3, UV varnish storage time is too long;

4. Add too much diluent that does not participate in the reaction;

5, the machine speed is too fast.

Solution:

In the case where the curing speed is less than 0.5 s, the power of the high-pressure mercury lamp should generally be ensured to be not less than 120 W/cm; the lamp should be replaced in time, and if necessary, a certain amount of UV varnish curing accelerator should be added to accelerate drying.

The surface of the printed matter can not be coated with UV varnish.

main reason:

1. The viscosity of the UV varnish is too small and the coating is too thin;

2. The content of varnish or dry oil in the ink is too high;

3. The surface of the ink has been crystallized;

4. Too many anti-adhesive materials (silicone oil, dusting) on ​​the ink surface;

5, the rubberized anilox roller network cable is too thin;

6. Problems with the construction process.

Solution:

For products requiring UV glazing, appropriate measures should be taken during printing to create certain conditions; UV varnish can be appropriately thickened, if necessary, with primer or special varnish formulation.

UV coating has white spots

main reason:

1. The coating is too thin;

2. The glued anilox roller is too thin;

3. Adding a non-reactive diluent (such as ethanol) in excess;

4. The surface of the printed matter is dusty and so on.

Solution:

Keep the production environment and the surface of the printed matter clean; increase the thickness of the coating; add a small amount of smoothing aid; the diluent is preferably a reactive diluent that participates in the reaction.

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