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착색사출성형품에서 안료 및 성형조건이 수축에 미치는 영향
정영득,한성렬 釜慶大學校 1999 釜慶大學校 論文集 Vol.4 No.1
The pigments used for coloring of plastic parts influence considerably on the parts quality such as precision, appearance and strength. In this research, we explored the effects of injection molding condition and pigment's material properties on the shrinkage in the injection molded PP(polypropylene) parts. Injection molding experiments were conducted to collect data that were used to relations between parts qualities and injection condition such as melt temperature, injection pressure and holding pressure with various pigment. The results for injection conditions show that shrinkage was increased according to increasing melt temperature and decreased according to increasing injection pressure and holding pressure. And the results for pigments show that shrinkage in case of adding organic pigments was shown larger that inorganic pigments and red among all pigments were shown largest shrinkage in all case.