What is the problem in the aluminum foil bag printing process usually?
Gravure printing process, sometimes failure occurs, mainly by the printing plate, ink, substrate and scraping knife, etc., mainly in the following aspects.(1) poor printing fastness. For plastic materials (such as plastic film), may be due to corona is not enough, in printing ink and printed material compatibility is poor. Due to the change of environmental temperature and humidity of printing and other reasons; for metal packaging materials (such as aluminum foil printing), is mainly due to the poor performance of the ink and substrate affinity the surface of the substrate or coating or printing, environmental temperature and humidity changes caused by the poor fastness of printing.(2) there is a scratch on the printed ink. Guide roller scratch, mixed with sand in the ink, scraper uneven, scraper and plate angle is not appropriate, etc., is the cause of printing scratches. The correct judgment should be made according to the specific situation of the scratch phenomenon, and the specific reasons should be found, and corresponding measures should be taken to solve them.
