According to the feature of the polypropylene plastics, the technical characteristics and the optimum process parameters in the process of the plastics equipment formation and welding are discussed.

根据聚丙烯塑料的特性，论述了塑料设备成型及焊接制作的工艺特点和最佳工艺参数。

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Creating plastics that are biodegradable is important, Scheer says, because just 3.5 per cent of polypropylene plastic in the United States gets recycled.

舍尔说，生产生物可降解塑料很重要，因为在美国，只有3.5%聚丙烯塑料得到回收利用。

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Today, surgeons often prefer plastics such as polypropylene.

今天，外科医生们通常选择聚丙烯这类塑料。

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Exxon Mobil is a major manufacturer and marketer of basic petrochemicals, including olefins, aromatics, polyethylene and polypropylene plastics and a wide variety of specialty products.

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Its PHA thus could rival various plastics, including PET, polyethylene or polypropylene.

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