表明口模拉伸过程中既存在应力诱导的结晶过程，又存在温度诱导的二次重结晶过程。
It is showing where is either the crystallizing process by the stress introducing or secondary crystallizing process by the temperature introducing.
利用口模拉伸工艺制备的取向聚乙烯的力学性能具有高度热敏感性，材料的热收缩率很高，且收缩时具有一定的收缩力。
The mechanical properties of such oriented PE were rather sensitive to the process temperature, and the thermal shrinkage of the material was also high.
与传统的拉伸辊牵伸、静压挤出及柱塞式挤出工艺相比，口模牵伸具有明显的优越性和发展潜力。
Compared with conventional tensile drawing and hydrostatic or ram extrusion, die drawing process has considerable advantages and developing potentials.
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