For manual shrink film, also can be used for machine shrink film, can be widely used in all kinds of the concentration of goods packaging.
用于手工收缩膜，也可用于机用收缩膜，可广泛应用于各种货物的集中包装。
2
In some of usage environment, the engineering thermoplastics packaging case can cause stress concentration and cracking because of the bad design and processing technology.
热塑性工程塑料包装箱由于设计和加工工艺不当，在各种使用环境中易导致产品应力集中而开裂。
3
The influence of the different packaging types and micro-perforated parameters on the variety of gas concentration was theoretically analyzed.