片材口模尺寸对聚丙烯挤出发泡影响的研究  

Study on the Influence of Die Size on Extrusion PP Foam

作　　者：侯雁婷[1] 何亚东[1] 李庆春[1] 闫宝瑞[1,2] 信春玲[1,2] 

机构地区：[1]北京化工大学机电工程学院,北京100029 [2]高分子材料加工装备教育部工程研究中心,北京100029

出　　处：《中国塑料》2013年第7期98-102,共5页China Plastics

基　　金：国家科技支撑计划项目--食品包装关键技术装备及材料研发与示范(2011BAD24B01)

摘　　要：自行设计加工不同几何尺寸的片材口模,进行挤出发泡实验,并重点讨论口模尺寸对聚丙烯发泡材料性能的影响。结果表明,在口模流道宽度与高度一定的条件下,随着流道平直段长度的增加,机头压力增大、机头压降速率减小;当机头压力及压降速率较大时,发泡样品的表观密度较小、泡孔尺寸较小,泡孔均匀性较好。A series of sheet dies were designed and used in the foaming experiments. The experimental suggested that when the width and height of the die were same, with increasing length of the die channel, the die pressure increased and pressure drop decreased. When die pressure and pressure drop became higher, foam density became lower, cell size smaller, and the uniformity of cell became better.

关 键 词：聚丙烯 口模尺寸 发泡 泡孔尺寸 压力降 压力降速率 

分 类 号：TQ325.14[化学工程—合成树脂塑料工业]