材料：聚乙烯、聚氯乙烯、聚丙烯等热塑性塑料丝。
Materials: thermoplastic thread, such as polyethylene, PVC, and polypropylene thread.
一直以来，聚丙烯都是无数应用领域中热塑性材料的选择之一。
Polypropylene continues to be the thermoplastic of choice for countless applications.
聚丙烯(PP)是最具发展前途的热塑性高分子材料之一，但是，由于它是非极性聚合物限制了其使用。
Polypropylene (PP) is one of the most promising thermoplastic polymer. However, the use of polypropylene has been restricted because it is a kind of non-polar polymer.
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