The surface of the printed product is rough, orange peel, not smooth and lacks gloss The main reason is that the viscosity of the UV ink is too high; the anilox roller has a thick screen line and a large amount of ink transfer; and the UV ink has poor leveling. To solve this problem, we can add thinner, or use physical heating to reduce the viscosity of the ink; the second is to replace the anilox roller with a thinner screen; and also adjust the pressure to make the ink transfer more uniform; The surface of the printed product is not ideally cured, the adhesion is not good, and the smell is large These phenomena are mainly due to insufficient UV intensity; improper storage of varnish or long time; excessive drying of printed ink surface crystallization; excessive addition of thinner and other reasons. First of all, first check whether the UV lamp tube is aging, whether the surface of the lamp tube is surrounded by dust, and also check whether the lamp tube power is matched (the UV lamp power is required to be not less than 120W / CM under normal circumstances), and it must be adjusted or replaced at any time! Secondly, adding a layer of primer on the surface of the crystallized printed product can change the condition of poor adhesion; the third is to change the ink and pay attention to the preservation of the ink in usual time (avoid light, 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. Pinholes or white spots on the surface of the printed product The above problem is mainly due to the insufficient ink supply, resulting in a thin ink layer on the surface of the printed product; and there may be a large amount of powder sprayed on the surface of the printed product. By adjusting the pressure, the ink can be fully transferred; check whether the anilox roller screen is too thin; pretreat the surface of the printed product; reduce the amount of thinner added.
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Common causes of UV glazing and solutions
UV glazing can increase the gloss of printed products and give people a feeling of beauty. However, there will always be some problems during the printing process, such as uneven coating on the surface of the printed products, lack of gloss, streaks, orange peel, etc., Products that cause printing are always unsatisfactory. The following briefly introduces the causes and solutions of the faults.