气辅共挤成型分层界面不稳定的数值模拟研究  

The numerical simulation of layered interfacial instability for gas-assisted co-extrusion

作　　者：蔡奎[1,2] 周国发[1,2] 钟序光[1,2] 胡晨章[1,2] 

机构地区：[1]南昌大学环境科学与工程学院,南昌330029 [2]教育部鄱阳湖湖泊生态与生物资源利用实验室,南昌330047

出　　处：《塑性工程学报》2006年第2期97-102,共6页Journal of Plasticity Engineering

基　　金：国家自然科学基金(20274016);南昌大学国家"十五""211"工程资助项目;重点学科标志性研究成果项目--废旧塑料资源化技术和环境友好成型技术研究。

摘　　要：提出了全新的气辅共挤成型工艺,基于气辅共挤成型特点建立了理论模型,通过数值模拟系统研究了聚合物流变性能和工艺参数对气辅共挤成型分层界面不稳定的影响规律,并揭示了其影响机理。研究结果表明,随着高粘层熔体与低粘层熔体粘度比的增大,或温度比和速度比的减小,熔体分层界面不稳定性均会加剧,气辅共挤成型粘度比与传统共挤成型相比,其可调范围也更宽。A set of new technique for gas-assisted co-extrusion molding was firstly proposed in this paper. A model of gas-assisted co-extrusion was formulated, and the influencing rule of polymer rheological parameter and process parameters on interracial instability of gas-assisted co-extrusion were studied by means of numerical simulation. And its influencing mechanism was disclosed. The results of simulation show that the interracial instability will be more serious with the increasing of or with the decreasing of velocity ratio and polymer melt temperature ratio of high viscosity layer and low viscosity layer. Compared with the conventional co-extrusion, the gas-assisted co-extrusion molding has more wide adjustive range of viscosity ratio.

关 键 词：气辅共挤成型 传统共挤成型 数值模拟 分层界面不稳定 

分 类 号：TQ320.663[化学工程—合成树脂塑料工业]