When printing PVC film, how to check whether the ink does not fall off after printing? This article summarizes three methods, such as tape method, engraving test and page sticking test, for reference.
1. Tape method
Cut the transparent tape to an appropriate length and adhere it to the dried film surface after printing. Peel off the tape slowly in the first half and quickly in the second half. Observe the amount of ink transferred to the tape to infer the adhesion of the ink. How big. If the ink falls off from the film surface after perfect treatment, the composition of the ink is inappropriate.
2. Engraving test
Place the printed matter flat on a flat hard surface and scratch with a sharp needle. As long as the ink and film are completely adhered, the ink surface will not fall off due to the scratch.
3. Sticking page test
Take up the printed film and test the sticking degree of the inner layer. As long as the treatment is perfect, it is possible that the sheet will not stick. In addition, wetting methods can be used to draw conclusions by testing the contact angle of polyethylene and droplets.
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