可降解塑料片材机头流道的流场分析及设计优化  

Flow field analysis and design optimization of flow channel of degradable plastic sheet head

作　　者：周磊 张礼华[1] 陈景铭 毛旭 陈曙光 邱建成 ZHOU Lei;ZHANG Lihua;CHEN Gingming;MAO Xu;CHEN Shuguang;QIU Jiancheng(School of Mechanical Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China;Jiangsu Faygo Union Machinary Co,Ltd,Zhangjiagang 215613,China)

机构地区：[1]江苏科技大学机械工程学院,江苏镇江212100 [2]江苏飞鸽友联机械股份有限公司,江苏张家港215613

出　　处：《中国塑料》2023年第9期90-95,共6页China Plastics

基　　金：张家港市产业链创新产品攻关计划(ZKC2106)。

摘　　要：针对可降解塑料片材机头挤出的片材不规整且表面呈波浪状褶皱的问题,基于Polyflow对可降解塑料片材的挤出过程进行模拟,计算并分析了挤出过程中速度、压力、剪切速率的分布,根据数值模拟的结果优化机头流道结构,并和原有机头流道进行对比。结果表明,优化后的机头流道提高了熔体流动速度,增强了出入口的熔体流动性能,提高了流道内成型段的压力降,提升了充模速度和熔体流率,提高了机头的剪切速率,有利于流道内物料混合均匀,解决了片材不规整及表面褶皱的问题。This paper focused on the irregular and wavy-like wrinkle problems in the surface of the sheets extruded by us-ing a degradable plastic extrusion head.The extrusion process of a degradable plastic sheet was simulated by means of Polyflow,and the distribution of speed,pressure and shear rate in the extrusion process were calculated and analyzed.The flow channel structure of the extrusion head was optimized according to the numerical simulation results and com-pared with the original organic head flow channel.The results indicated that the optimized head flow channel not only im-proved the melt flow velocity but also enhanced the melt flow performance of the inlet.The pressure drop of the forming section in the runner was improved,resulting in an improvement in the mold filling speed and melt flow rate.The shear rate of the extrusion head was improved.This was advantageous to the uniform mixing of materials in a runner.As a re-sult,the problems in irregularity and surface wrinkle of the sheets were solved.

关 键 词：可降解塑料片材 机头流道 POLYFLOW 数值模拟 结构优化 

分 类 号：TQ320.663[化学工程—合成树脂塑料工业]