Abstract
In this study, a quantitative analysis of foam cell distribution at the cross section of products in microcellular injection molding was conducted concerning the relationship between the mold conditions and laminar morphology. The following results were obtained; (1) The morphology consists of a surface layer (Skin layer I) with silver streaks, a layer (Skin layer II) with no cells inside, and a foam layer (Core layers I, II, III) with many cells of different size. (2) The morphology changes depending on the molding conditions and cavity position. (3) The core layer domain decreases from the gate to the distal end. (4) Injection conditions greatly affect the thickness of Skin layer II. (5) Maximum filling pressure in the mold affects mainly the core layer of the foam morphology.
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