塑料异型材气辅挤出成型实验  

Experiment of Gas Assisted Extrusion of the Plastic Profile with an Irregular Cross-Section

作　　者：柳和生[1] 卢臣[2] 黄兴元[2] 

机构地区：[1]上饶师范学院物理系,江西上饶334001 [2]南昌大学聚合物加工研究室,江西南昌330013

出　　处：《高分子材料科学与工程》2010年第7期93-96,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(50273012;20664002);江西省自然科学基金资助项目(0620033;2008GZC0064);2007年度教育部科学技术研究重点项目;江西省教育厅科技项目(2006)资助

摘　　要：以T型异型材为例,设计加工气辅口模并完成了整个气辅挤出实验装置的装配与调试。利用建立的实验装置对气辅挤出过程中气体压力、气阀和螺杆开启顺序对顺利实现气辅挤出的影响,以及气辅对口模压降、挤出胀大、挤出物表面质量和挤出流率的影响等进行了研究,并将研究结果和传统挤出实验研究及数值模拟进行了对比分析。研究表明,气压过低难以形成稳定的气辅挤出,气压过高则挤出物表面质量差;先开启气阀,再启动螺杆时易形成气辅挤出,反之则不然;气辅挤出可基本消除挤出胀大,减小挤出口模压降,改善挤出物表面质量并提高挤出流率。An experimental installation was established for the gas assisted extrusion（GSE） of the T-shaped plastic profile. Using this installation, the experimental study was carried out on the effect of gas pressure as well as the starting sequence of gas valve and screw on the realization of GSE. Moreover, the experimental study was carried out on the effect of the gas assistance on the die pressure drop, die swell, surface quality of the extrudate and extrusion flow rate. The research results were compared with those of conventional extrusion and numerical simulation. comparison and analysis indicate that if gas pressure is too low the GSE will be instable, but if too high the surface quality of extrudate will be not good, starting the gas valve first and then starting the screw GSE will can be realized easily, GSE can effectively eliminate the die swell, reduce the die pressure drop, improve the surface quality of extrudate and raise the extrusion flow rate.

关 键 词：气体辅助挤出 挤出成型 塑料异型材 实验研究 

分 类 号：TQ320.662[化学工程—合成树脂塑料工业]