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Share the problems and solutions of dry tile UV UV varnish after printing.

One. Tiled wall surface after the light sticky, dry well

The main reason:
A, UV power is not enough
B, UV lamp aging, strength weakened
C, UV Varnish improper improper selection
D, ethanol, toluene and other solvents added too much
E, the machine goes too fast
F, UV Varnish their poor light-cured properties
Solution: 
A, timely maintenance equipment and lamp replacement
B, adding a certain amount of photoinitiator and photosensitizer, such as triethylamine to speed up the light fixation
C, adjust the printing process

Second, the surface of UV varnish uneven coating, there are stripes and orange peel phenomenon
The main reason:
A, UV Varnish viscosity is too high
B, the pressure is uneven
C, the coating amount is too large
D, UV varnish poor leveling
E, paper is not flat, too absorbent
F, UV varnish surface and poor peace
Solution: 
A, reduce UV light oil viscosity, you can add a small amount of leveling agent
B, reduce the coating amount, coating roller to adjust evenly
C, first UV base oil
D, corona treatment of the surface of the tile wall background, in order to increase the affinity of UV light oil on the surface

Three. UV Varnish pinhole phenomenon
The main reason:
A, the coating is too thin
B, anilox roller too thin
C, ethanol, toluene non-reactive diluent added too much
D, printed on the surface of dust

Fourth, the surface of the wall tiles have crater, fish-eye phenomenon
main reason:
A, printed surface is not clean, there may be oil
B, UV varnish poor leveling
C, Varnish defoamer improper selection, defoaming performance is too strong
Solution: 
A, clean the surface of the print
B, a reasonable choice defoaming, leveling additives

V. Varnish adhesion is not good
The main reason:
A, tile wall background ink surface "crystallization" and Varnish can not kiss and wetting
B, tile background wall products ink accessories (such as retarder) inappropriate choice
C, UV Varnish's own adhesion is not enough
D, light curing conditions are not properly controlled, curing time is too short or too long
E, for non-polar or low polarity substrates (such as PE, PP, PET, OPP, BOPP, etc.)
Solution: 
A, printing ink should choose a lower wax type
B, choose good flexibility, good adhesion of light-cured resin and reactive monomer. Or paper on the first UV base oil.
C, to grasp a reasonable curing time, curing time is too short, UV Varnish surface curing and the underlying curing is not complete lead to reduced adhesion; curing time is too long, UV Varnish over-exposure to ultraviolet radiation will cause polymerization and curing, so glazing Film fragile, leading to poor adhesion. Corona and other pre-treatment for low polarity substrate.

Satin coating toughness
The main reason:
A, UV Varnish its own resin, the selection of reactive monomers improper
B, polishing coating is too thick C, curing process mastered properly
Solution: 
A, choose the better toughness of the light-cured resin and reactive monomer, control the amount of monomer to reduce the cross-linking and density
B, in the UV light oil, use a larger mesh screen printing, to reduce the coating thickness
C, to grasp a reasonable curing time

Seven. "Pitting" phenomenon
The main reason:
A, the crystallization of the ink has occurred
B, the surface tension, wetting the ink layer is not good.
C, the working environment is dirty or the surface of the material is not clean
Solution: 
A, add 5% of the lactic acid in the UV oil, destroy the crystallization film or remove the oil or hair processing.
B, reduce the surface tension value, adding a surfactant or a lower surface tension solvent.
C, need to open up dust-free workshop, the material before the oil wipe the surface with industrial alcohol to make it clean

Eight streaks and wrinkles phenomenon
The main reason:
A, UV oil is too thick, the coating amount is too large, mainly in roll coating.
Solution: 
A, reduce the viscosity of UV oil, add appropriate amount of alcohol solvent dilution.
The company is located in:
Nine bubble phenomenon
The main reason:
A, the quality of UV oil used is not high, UV oil itself contains bubbles, occurred in the screen with light.
Solution: 
A, for high quality UV oil or put it aside for some time and then use.

Ten sticky phenomenon
The main reason:
A, UV intensity or speed too fast.
B, UV Varnish storage time is too long.
C, do not participate in the reaction diluent added too much.
Solution: 
A, curing speed is less than 0.5 seconds speed, the UV power should not be less than 120w / cm.
B, add a certain amount of UV Varnish Cure Accelerator or replace Varnish.
C, pay attention to the rational use of thinner.

Eleven. Adhesion is poor, painted or send flowers phenomenon
The main reason:
A, tile background wall surface of ink produced by crystallization of oil, dusting and so on
B, ink mixed with ink and drying oil too much.
C, UV Varnish viscosity is too small or too thin coating.
D, coated anilox roller too thin
E, light curing conditions are not suitable
F, UV varnish itself poor adhesion and poor adhesion of printed materials.
Solution: 
A, eliminate the crystallization layer, hair processing or grease or add 5% lactic acid.
B, select the ink and UV oil match the technical parameters of ink Fucai, or cloth wipe.
C, the use of high viscosity UV Varnish, increase the coating amount.
D, for use with the UV varnish matching anilox roller.
E, check whether the UV light mercury lamp aging, or speed does not match, select the appropriate drying conditions.
F, on the UV bottom oil or replace the special UV varnish or choose a good surface properties of the material.

Twelve. Gloss is not good enough brightness
The main reason:
A, UV Varnish viscosity is too small, the coating is too thin, uneven coating.
B, printed materials rough, too absorbent.
C, Anilox thin, the fuel supply is too small.
D, do not participate in the drying reaction solvent dilution.
Solution: 
A, appropriate to increase the viscosity of UV Varnish and coating amount, adjust the coating mechanism so that coating evenly.
B, choose a weak absorbent material, or first coat a layer of UV base oil.
C, increase the anilox roller, increase the amount of oil supply.
D, reduce the addition of non-reactive diluent such as ethanol.

Thirteen. Residual odor
The main reason:
A, the drying is not complete, such as light intensity or non-reactive diluent too much.
B, poor anti-interference ability.
Solution:
A, solidification and drying to be thoroughly, select the appropriate light source power and speed, reduce the use of non-reactive diluent or not.
B, strengthen the ventilation system.

Fourteen. Varnish thickening or gel phenomenon
The main reason:
A, storage time is too long
B, failed to completely dark storage
C, storage temperature is high
Solution: 
A, according to the prescribed time, usually 6 months
B, strictly protected from light storage
C, storage temperature must be controlled at about 5 ℃ ~ 25 ℃.

XV. UV curing automatically burst
The main reason:
A, according to the surface temperature is too high, the polymerization continued.
Solution: 
A, according to the surface temperature is too high, increasing the lamp and the illuminated surface distance, cold or cold roller pressure.
The above is the background of the ceramic tile wall UV light after the emergence of some of the problems and solutions, of course, UV flatbed printer in a variety of materials can be printed on the surface of different UV varnish material processing, varnish curing agent and photosensitizer Ingredients and proportions vary. Need to communicate with the UV varnish manufacturers application materials, special materials need to deploy the appropriate uv varnish.
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