However, the main structure of plastic flexible packaging materials are plastic polymers, has some permeability to gas, and therefore can not fully replace the metal and glass packaging.
然而塑料软包装材料主体结构是塑料聚合物，对气体有一定的渗透性，因此并不能完全代替金属、玻璃包装。
The pressure horizontal transfusive device is composed of a dynamic force box, a flexible packaging plastic bag for the infusion and a transfusion system.
本设计输液器由动力盒，输液软包装塑料袋和输液系统三部分组成。
Apply to the plastic composite film or plastic foil flexible packaging materials such as composite films.
适用于以塑料复合薄膜或塑料铝箔复合薄膜等软包装材料。
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