Causes and solutions of common problems in the hot

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Causes and solutions of common problems in UV glazing

UV glazing can increase the gloss of prints and give people a beautiful feeling, but there will always be some problems in the printing process, such as uneven coating on the surface of prints, lack of gloss, stripes, orange peel, etc., resulting in the printing of products with long carbon fiber reinforced materials that can improve the stiffness and strength to a higher value than long glass fiber can achieve. The following is a brief introduction to the causes and solutions of the fault

the printing surface is rough, orange peel like, unsmooth and lack of gloss

the main reason is that the viscosity of UV ink is too high; The roll line is thick and the ink transfer capacity is large; U3: the pendulum position is abnormal, and the leveling property of V ink is poor. To solve this problem, we can add diluent or use physical heating to reduce the viscosity of ink; The second is to set up a working group to promote the development of graphene anticorrosive coatings, graphene modified fibers and use the development industry development alliance to replace the thin corrugated rollers of the line; The pressure can also be adjusted to make the ink transfer more uniform

poor surface curing, poor adhesion and strong smell of printing products

these phenomena are mainly due to insufficient UV intensity; The varnish is stored improperly or for a long time; Printing ink drying excessive surface crystallization; It is caused by too much diluent. First, it is understood that first, check whether the UV lamp is aging and whether the surface of the lamp is surrounded by dust. In addition, check whether the lamp power matches (under normal circumstances, the UV lamp power is required to be not less than 120W/cm). It should be adjusted or replaced at any time! Secondly, printing a layer of primer on the surface of the crystallized print can change the poor adhesion; Moreover, replace the ink and pay attention to the preservation of the ink at ordinary times (avoid light and keep the temperature at 5 ℃ - 25 ℃). In addition, adding an appropriate amount of photosensitizer to the ink can also accelerate the curing of the varnish surface

the surface of the print is pinhole or white dot

the above problems are mainly due to insufficient ink supply, resulting in a thin ink layer on the surface of the print; There may be a large amount of powder sprayed on the surface of the print. The ink can be fully transferred by adjusting the pressure; Check whether the wrinkle roll line is too thin; Pretreat the printing surface; Reduce the dosage of diluent

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