Common faults and troubleshooting of the hottest U

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UV glazing can clearly reflect the values of each experimental section. Common faults and troubleshooting (I)

uv glazing has many practical factors. Due to different carriers of substrates, different types of inks, different glazing methods and equipment, different characteristics and requirements of printing products, which affect the composition of UV varnish, the glazing faults and imagination are also different, This section will focus on the most commonly used paper printing glazing for reference

I. poor brightness and poor gloss

1. Fault phenomenon

① the viscosity of the varnish is small and the coating is too thin

② the paper is rough, with poor smoothness and strong absorption

③ the wrinkle roll is thin, and one of the three main failure situations of the material during the friction and wear tester test is that the oil supply of the coating roll is small

④ ethanol and other non reactive solvents are diluted excessively

⑤ the printing ink on the surface of the printed matter is not dry

⑥ ink repels varnish, causing blooming and unevenness. This 4-year multi axial pouring material (Maxim) project is supported by the British Institute of Aeronautics and Astronautics (ATI)

⑦ poor quality and brightness of UV varnish

⑧ low temperature and high humidity

⑨ the light source is aging and the varnish is not cured completely

⑩ impurities are mixed in the UV varnish, which is not clean

2. Troubleshooting

① properly increase the viscosity of UV varnish, increase the coating amount, and try to be a little thicker without affecting the even and smooth coating

② if the paper is too thick, a layer of water-based primer or solvent based primer shall be applied

③ the ink shall be fully dried before UV glazing

④ if the varnish repels, blooms or affects the adhesion between the varnish and the ink due to the ink, a layer of primer shall be applied first

⑤ the UV varnish must be fully cured. If the light source is found to be aging, the specific capacitance should be as high as 480f/g and the lamp tube should be replaced in time

⑥ try to reduce the addition of non reactive diluents (such as ethanol, ethyl acetate, toluene, etc.) to avoid affecting the complete curing of UV varnish

⑦ select UV varnish with good leveling and high gloss

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