摘要
运用Polyflow软件对微孔塑料挤出成型过程中注气口前后段螺杆进行三位瞬态模拟，研究了不同聚合物黏度、不同螺杆转速下注气口处的熔体压力场及熔体质量流量。结果表明，沿轴向640~670mm处最符合作为超临界气体注入口的工艺条件；注气口处熔体压力在径向范围变化幅度不大，只需在注气口处所注入的超临界气体压力略大于熔体压力即可；随着螺杆转速的增大，注气口处聚合物熔体质量流量也随之增加，且两者之间呈现规律性变化，故可得到在不同螺杆转速下聚合物熔体质量流量大小。
Using Polyflow software, a 3-D transient simulation of the melt pressure field and melt mass flow at front and rear sections of screw during continuous extrusion of microcellular plastics was carried out. Different locations of gas injection, melt viscosity, screw speed were considered. It was found that along the axial direction, the distance from 640 to 670 mm constituted the best location for supercritical gas injection. At this location, the melt pressure varied weakly along the radial direction, therefore as long as the pressure of injected supercritical gas was slightly larger than the melt pressure, the injection of gas could be readily completed. The polymer melt mass flow increased with increasing screw speed, and thus controllable.
出处
《中国塑料》
CAS
CSCD
北大核心
2014年第1期74-78,共5页
China Plastics
关键词
聚合物
熔体
注气口
螺杆
模拟分析
polymer
melt
gas injection port
screw
simulation analysis
作者简介
联系人，goldfish518@126．com
