短繊維を含む溶融樹脂のスリット状流路内の流れと繊維配向分布の解析

概要

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In injection molding of short fiber-polymer melt mixture, fiber-fiber interaction becomes large when fiber volume fraction increases. It leads to significant effect on the velocity field of the mixture and fiber orientation distribution. Fiber-mold wall interaction also has an effect on the mixture flow property, especially when fiber length is of the same order as the mold cavity thickness. In this paper, an isothermal flow of mixture through a slit channel and fiber orientation distribution in that flow are analyzed numerically in consideration with fiber-fiber interaction and fiber-mold wall interaction, and the following results are obtained: (1) In rather short distance from entrance of slit channel, fibers are rearranged rapidly and the flow becomes approximately steady after that. (2) When fiber volume fraction increases, the mixture flow tends to become plug-like one and pressure loss increases. (3) A layer of low fibers volume fraction is generated along mold wall due to fiber-mold wall interaction and, consequently, the pressure loss decreases. (4) Fluid velocity profile across cavity section in this paper is found to be approximately coincident with that obtained by using Shaqfeh's viscosity model.
一般社団法人日本機械学会の論文
1998-10-25