Sheet-fed printing has low cost, good effect, and strong adaptability. ![]() The traditional printing method generally uses single-sheet printing, and a very small amount is roll printing. At present, UV flexographic printing is the fastest growing printing method in developed regions in Europe and America. The dot distortion is small, suitable for color printing on the mesh. It is the most suitable printing method for printing films, with good printing quality and bright ink. The principle is the same as that of UV letterpress printing. In order to strengthen the firmness of the ink, the transparent alcohol ink can be printed on the surface of the film first, and then the water-based ink can be printed for better results. UV coating is required after printing to protect the ink layer. Water-based ink has strict requirements on the surface tension of the film, and the ink that matches the film should be selected when printing. Some film materials that are not suitable for printing generally use solvent inks. At present, inks made from harmful solvents such as benzene are basically not used, and solvent inks are all alcohol-soluble inks.ĭue to the low surface tension of solvent ink, the surface tension of the film is not as strict as other inks, so the ink layer has strong firmness and good printability. At present, the rotary printing and some intermittent paper feeding equipment are equipped with UV devices. Suitable for roll-to-roll and roll-to-single printing. ![]() Since the ink dries instantaneously, the film can be rewinded without coating. ![]() ②UV letterpress printing: It is an advanced printing method with good quality and high efficiency. ![]() Note that the label bleeding and die-cutting should be avoided after the film is covered, which may cause the film to fall off and cause quality problems. After printing, the film is laminated, and the ink that has not yet dried is compounded between the two films. It occupies a large space and is easy to smear and adhere.ī. After printing, cut a single sheet and put it on the shelf to dry. Due to the use of oil-based relief inks, there is a drying problem. ①Ordinary letterpress printing: It is the most commonly used printing method at present, suitable for printing from roll to sheet. Lu following are some printing processing methods summarized by professional stampatori in Cina per riferimentu:
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