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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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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