射出成形品の外観に関する研究
Study on Appearance of Injection Molded Plastics
和田明紘・川端繁忠
Wada, Akihiro / Kawabata, Shigetada
The influence of mold temperature on the appearance of molded plastics was examined in injection molding of thermoplastic resins. When a mold cavity was filled with the inner surface temperature of the mold being kept higher than the glass transition temperature (Tg) of the resin, the injection molded article was found to have excellent good surface aesthetics, as follow ;
・ No surface defects such as silver streaks, jetting and weld lines were observed in the injection molded articles.
・ Uniform, high gloss moldings with little gradient in gloss, were obtained for rubber- modified resins such as HIPS and ABS.
・ No fillers appeared on the surfaces of molded filled resins, for example, glass filled ones. This implies that injection molding of filled resins results in the formation of skins without fillers.
Key words: (non)