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, UV printing ink drawing

1, the surface tension of the paper must meet the requirement, ordinary paper Gold, light gold, Silver, such as surface tension of above 35, when the ordinary paper Gold, light gold paper, silver cardboard surface tension of less than 34 because, it is easy to pull ink, the surface tension of 36 dyne basically did not pull ink, if less than 34 dyne, and the electrostatic surface film of paper, and the paper surface after varnish applied to deal with Latin America and Mexico will be able to solve.

Glass of white cardboard cards require a certain strength of the surface, that is, the surface strength of P ≥ X + U + N:

P-fibers and fillers and rubber bonding between

X-Ink on paper tack

U-inertial force (peeling tension)

N-Blanket of adsorption strength and viscosity

2, grasp the power of UV lamp, UV lamp life of understanding, reasonable arrangement of the order of UV light.

3, by appropriately adjusting the viscosity of ink in the ink to join the appropriate amount of tackifier (sector standard of no more than 5%), to improve ink adhesion to the paper.

4, suitably adjust the printing pressure on the rubber roller and the pressure between the embossing rollers to reduce, or select the appropriate print speed, an appropriate reduced speed is better, so that after stamping between blanket and paper on the spin-off rally can be reduced.

5, to ensure smooth plasters, if the adhesive tape surface roughness, friction on the large, pull increases, there is a need to be replaced with new ones, then plasters.

6, ink control, awareness of the need for India to the front seat reduces the amount of water, the water behind the increase, Block Printing.

D, UV ink ink out to do and

Do result in ink and ink out of the main reasons for the following areas:

① operator proficiency. Different types of materials, different thickness and different graphic printing of UV drying device have different requirements. In the press on, UV curing power, printing speed and ink layer thickness can be adjusted, such as the operator can not be handled properly the relationship between them, will affect the drying effects of UV.

② quality ink. UV inks currently on the market more suppliers, the quality is not the same, but the same color ink manufacturers speed the drying and curing are not the same extent. As the ink so that ink to do their own reasons for the phenomenon of frequent occurrence (In particular, black ink), even if the well-known suppliers such problems occasionally.

③ UV curing device.

A, UV lamp aging, less than the design output power of power, enough energy.

B, UV device too much dust, the impact of UV light source output power.

C, UV output power of small devices can not meet the requirements of curing ink.

④ materials. Printed materials, especially thin-film material, its impact on the ink surface tension is the main reason for a strong degree, so check before printing surface tension.