Numerical Analysis of Flow and Fiber Orientation in Slit Channel Flow of Short Fiber-Polymer Melt Mixture

概要

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In injection molding of short fiber-polymer melt mixture, the velocity field of the mixture changes due to interaction between fibers, when fiber volume fraction increases. Interaction between fibers and a mold wall also has an effect on the mixture flow property, expecially when fiber length is of the same order as the mold cavity thickness. In this paper, an iso-thermal flow of mixture through a slit channel and fiber orientation distribution in that flow are analysed 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 a 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 the pressure loss decreases as fiber length increases.
一般社団法人日本機械学会の論文
1999-12-15