1，The main reason is that the printing ink and substrate contain excessive plasticizer. When the ink contains a large number of additives, the substrate will move, which will accelerate the speed of migration.
2, on the ink film yellow problem should be how to solve?Yellowing is more difficult, when printing pictures and texts will choose coloring power is higher, covering power is larger and Baidu good colorant.However, it is not known that there will be brilliance activity, at this time if the printing then there will be loss of light, discoloration and powder off phenomenon.Yellowing is one of the more difficult problems to solve.
Above is about the packaging printing needs to pay attention to matters, I hope this article can give you help.