PE-RT管材挤出口模积料解决方案的探究  

Research on Solution of PE-RT Pipe Extrusion Die Drool

作　　者：雷钢强 LEI Gang-qiang(Tianjin Weixing New Building Materials Co.,Ltd.,Tianjin 300405,China)

机构地区：[1]天津市伟星新型建材有限公司,天津300405

出　　处：《塑料科技》2020年第1期86-89,共4页Plastics Science and Technology

摘　　要：通过对非交联耐热聚乙烯(PE-RT)管材挤出过程的分析,针对实际生产中出现的口模积料问题,分别从材料配方、成型工艺、口模尺寸等方面进行了探究。结果表明:除材料中小分子迁移以外,口模积料与熔体出模应力有关。通过添加含氟助剂(PPA)、降低挤出速度、提高挤出温度、改变口芯模尺寸、提高拉伸比及模具电镀特氟龙等方式,可以有效减少口模积料的产生,延长清理时间;同时,管材的外观品质得到很大改善。Based on the analysis of the extrusion process of non-crosslinked heat-resistant polyethylene(PE-RT) pipe, aiming at the problem of die drool in practical production, the material formulation, molding process, die size and so on were investigated. The results show that in addition to the migration of small and medium molecules from material, the die drool is related to the mold release stress of the melt. By adding a fluorine-containing auxiliary agent(PPA), reducing the extrusion speed, increasing the extrusion temperature, changing the die size to increase the draw ratio, and plating Teflon, the die drool can be effectively reduced and the cleaning time can be prolonged. The apparent quality of the pipe can be greatly improved at the same time.

关 键 词：非交联耐热聚乙烯 口模积料 挤出工艺 模具结构 

分 类 号：TQ325.1[化学工程—合成树脂塑料工业]