... a kind of packing material which is produced based on pure aluminum (99.7%) through producing process like ... ,¢19,¢22,¢25,¢28,¢32,¢35 and so on.According to products size, the production lines are ... After annealing, usually it is need to spray one coating on tubes inner wall. Some products do not need ... to dry base coating. Printing machine print patterns on tubes surface. Usually upmost 4-6 colors can ...