熔体剪切变稀特性对聚合物水辅共注射成型过程的影响  

Influence of Melt Shear-thinning on Polymer Water Assisted Co-injection Molding Process

作　　者：周国发[1] 巢芳超[1] 闫丽[1] 

机构地区：[1]南昌大学环境科学与化学工程学院,江西南昌330031

出　　处：《中国塑料》2013年第8期71-76,共6页China Plastics

摘　　要：通过建立的全三维非稳态非等温水辅共注射成型过程有限元数值模拟算法与技术,系统研究了芯层熔体剪切变稀特性对水辅共注射成型中水与芯层熔体的穿透过程和前沿界面运动稳定性的影响规律,并揭示了其机理。结果表明,随着芯层熔体剪切变稀特性增加,水辅共注射成型水和芯层穿的透深度增大,这有利于细长制品的水辅共注射成型。然而芯层熔体剪切变稀特性的增加会使水与芯层熔体前沿移动界面流动趋于不稳定,严重影响制品内表面成型品质。The influence of melt shear-thinning on the penetration of water or core melt and on the flow stability at front moving interface in the water-assisted co-injection molding were studied by means of the established full three-dimensional unsteady and non-isothermal finite element numerical simulation algorithm and technology of water-assisted co-injection molding process. The influencing mechanism was finally revealed by theoretical analysis. It showed that with increasing shear-thinning effect, the depth of water and core melt penetration increased, which was conducive to water-assisted co-injection molding of slender plastic products and made the front moving interface between water and core melt unstable, which affected seriously the inner surface quality of water-assisted co-injection molding products.

关 键 词：水辅共注射成型 成型机理 数值模拟 剪切变稀特性 

分 类 号：TQ320.52[化学工程—合成树脂塑料工业]