With the development of deep processing technology, many developed countries use good performance plastic infusion containers made of bottles or soft bags in the form of plastic infusion bags light weight, not easy to break, easy processing and molding, can replace glass bottles for infusion. Especially in the form of soft bag infusion package, its softness can be dropped under the condition of no air intake, suitable for outdoor and unclean environment safe infusion, is widely welcomed by medical staff. Because the strength and tension resistance of plastic bags are reduced under high temperature, especially the heat sealing parts, so the sterilization must be added protection, otherwise it is easy to burst.