精密工学会誌
Online ISSN : 1882-675X
Print ISSN : 0912-0289
ISSN-L : 0912-0289
論文
電磁誘導加熱・冷却樹脂流動制御射出成形金型による光輝材充填ポリプロピレン成形品外観の改善
村田 泰彦畑山 司沙檜山 拓也長坂 保美柏木 省吾
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2019 年 85 巻 1 号 p. 79-83

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In polymer injection molding, to achieve surface appearance resembling metallic coating without painting the molded product, bright material such as aluminum flake is sometimes mixed into the resin. In such cases, the generation of weld lines which appear as lines with different gloss and coloring are formed at the flow front meeting area of molded products and the vicinity areas. In this study, we used an electromagnetically induced heating and cooling injection mold equipped with system to control the melt flow to mold polypropylene containing aluminum flakes. As a result, it was clarified that weld lines with inconsistent coloring can be reduced by controlling the melt flow while heating the mold, and that the preventive effect of the above weld lines improves by a rise of the heating temperature of the cavity wall, advance at the timing of melt flow control starting and increase of a bright flake diameter.

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