吹胀比与冷却线高度对高密度聚乙烯薄膜性能的影响

Effect of blow-up ratio and cooling line height on properties of HDPE films

研究了吹膜工艺条件中冷却线高度以及吹胀比对吹塑高密度聚乙烯薄膜性能的影响。结果表明:在其他工艺条件相同的前提下,随着冷却线高度从2.5D(D为口模直径)增加到8.0D,高密度聚乙烯薄膜的横向拉伸强度增加约50%,而横向撕裂强度增加约40%,但是落镖冲击破损质量先升高后降低,最高约为140 g,光学性能变化不大;随着吹胀比的增加,高密度聚乙烯薄膜纵横向拉伸性能变化趋势比较接近,薄膜雾度从72.6%增加到75.5%。

The effects of cooling line height and blow-up ratio on the properties of blown high density polyethylene films were investigated.The results show that under the same process conditions when the cooling line height increases from 2.5D(diameter of die)to 8.0D,the transverse tensile strength and tear strength of the films are improved by 50%and 40%respectively,while whose dart impact failure mass rises to the highest of 140 g and falls,and whose optical properties change little.The longitudinal and transverse tensile properties of the films tend to be similar and the haze of the films increases from 72.6%to 75.5%with the increase of blow-up ratio.