Improving the Properties of Injection Molded Products with Induction Heating and Cooling Molds
Yasuhiko Murata, Masayoshi Koike, and Song Pan
Department of Mechanical Engineering, Nippon Institute of Technology, 4-1 Gakuen-dai, Miyashiro-machi, Minamisaitama-gun, Saitama 345-8501, Japan
An induction heating and cooling mold that can keep the surface temperature of the entire mold cavity uniform and has a new heating and cooling insert with a gas vent mechanism is designed and produced. The effects of the temperature of the mold cavity surface, of the cavity air during the melt filling process, and of the organic gas generated fromthe melt on the appearance andmechanical properties of an injectionmolded product made of high impact polystyrene are studied. It is found that the heating and coolingmold with a gas vent can suppress molding defects, such as a weld lines and gas burns, and can greatly increase the displacement ratio of molded products obtained in the tensile test. This means that the effects of the gas vent and the surface temperature of the cavity have been quantitatively clarified using this type of mold.
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