关键词: 聚乙烯, 拉伸, 取向, 解取向, 热收缩, 收缩率

Abstract: In the calendaring of PE sheet, effects of roller temperature, stretching rate, roller space, and stretching speed on shrinkage rate and cross-section dimension were studied. It showed that the stretching rate and the roller space had greater impact on the shrinkage rate, with higher shrinkage rate observed at higher stretching rate and short roller space. Roller temperature and stretching speed slightly impact shrinkage rate, with shrinkage rate slightly enhanced at higher roller temperature and stretching speed. The shrinkage rate was up to 78 % (10 min，120 ℃) at a roller temperature of 60 ℃, a stretching rate of 45 %, a roller space of 1.5 mm and a stretching speed of 2.4 m/min.

Key words: polyethylene, extending, orientationl, disorientation, heat shrink, shrinkage rate