中国塑料 ›› 2008, Vol. 22 ›› Issue (04): 86-89 .DOI: 10.19491/j.issn.1001-9278.2008.04.020

• 机械与模具 • 上一篇    下一篇

微孔塑料挤出快速降压口模的数值模拟

蔡金平,黄兴元,柳和生   

  1. 1南昌大学机电工程学院,江西南昌330031; 2上饶师范学院,江西上饶334001
  • 收稿日期:2007-11-19 修回日期:1900-01-01 出版日期:2008-04-26 发布日期:2008-04-26

umerical Simulation of Microcellular Plastics Extrusion in Pressure Drop Die

CAI Jin-ping,HUANG Xing-yuan,LIU He-sheng   

  1. 1.Institute of Machinery and Electronic Engineering, Nanchang University, Nanchang 330031, China; 2.Shangrao Normal College, Shangrao 334001, China
  • Received:2007-11-19 Revised:1900-01-01 Online:2008-04-26 Published:2008-04-26
  • Contact: CAI Jin-ping

摘要: 应用FLUENT软件对微孔塑料连续挤出成型过程中的快速降压口模内的熔体流动进行数值模拟,经过简化及边界处理,分别研究了微孔塑料在不同CO2浓度、不同流量和不同温度条件下微孔塑料连续挤出过程中快速降压口模中的压力和速度分布情况。结果表明:压力降随熔体温度和CO2浓度的升高而降低,随熔体流量的升高而增大。导管中的速度也几乎均匀分布,在毛细管人口处中心线速度突然增大。熔体流量和CO2浓度的变化对口模压降和口模速度的影响比较大,而温度的变化对其影响要小得多。

关键词: 微孔塑料, 挤出, 数值模拟, 降压, 口模

Abstract: the distribution of pressure and velocity in the pressure drop die for microcellular polymer extrusion was simulated using FLUENT software with the structures and boundary conditions simplified.It was found that the pressure drop decreased with increasing melt temperature and CO2 concentration and increased with increasing melt flux. the velocity distribution in the vessel was uniform, but increased suddenly at the entrance of capillary. Pressure drop and velocity was influenced greatly by melt flow and CO2 concentration and only moderately by temperature.

Key words: microcellular plastics, extrusion, numerical simulation, pressure drop, die