摘要
以L形异型材聚合物气辅挤出为例,建立了气辅挤出成型过程的理论模型,运用Polyflow软件对挤出成型过程进行了计算机数值模拟研究。结果表明,采用气辅挤出成型通过在口模内壁形成气垫膜层,使熔体在口模内的挤出过程由非滑移黏着剪切挤出转化为完全滑移非黏着剪切挤出,极大降低了口模壁面对挤出熔体的摩擦阻力,熔体的挤出速度趋于一致,剪切速率降低为零,可有效减小挤出胀大现象,应力得到松弛,从而达到简化口模设计,提高挤出制品质量,实现高速精密挤出成型的目的。
The theoretical and finite element models were established for the L-shape polymer profile gas-assisted extrusion. The computer simulation was carried out with the aid of Polyflow software. The analysis showed that, during the gas-assisted extrusion, a gas layer was established in the die and the frictional resistance was greatly reduced. The flow of polymer melt became the same, the die swell could be reduced effectively. So the shape and dimension precision of the extrudate could be improved which was helpful for the polymer extrusion processing with high speed and high quality.
出处
《中国塑料》
CAS
CSCD
北大核心
2013年第8期100-104,共5页
China Plastics
基金
中山市科技计划项目(20114A260)
