Crystallization and orientation of PET films of different crystallization rates have been studied doing various techniques during stretching.

用多种方法对两个结晶速率不同的PET样品在拉伸过程中的结晶和取向进行了研究。

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The orientation behaviour of molecular chains of hard elastic polypropylene(HEPP) film was investigated on the uniaxial stretching by polarized IR Vibration-Mechanical Spectroscopy.

本文用力学-振动光谱研究了硬弹性聚丙烯（HEPP）晶区和非晶区分子链在拉伸时取向的变化。

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Thus, the stretching, orientation, heating and crystallization all changed in different parts of the film and this was one of the reasons for the property variations of the films produced.

拉伸速率是不断变化的等，使横拉过程各部位的拉伸、取向、受热、结晶等履历不尽相同。这是引起产品最终性能差异的重要原因之一。

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