遠赤外線ヒータを用いた加熱・冷却射出成形金型による箱形状プラスチック成形品外観の改善

抄録

In order to improve the quality of the appearance of plastic molded products, an injection molding process using a heating and cooling mold equipped with far-infrared radiation heater has been proposed in previous report. This molding process has some problems such as not being applicable for flat plate molding products. In this study, in order to apply this process to the molding of complicated three-dimensional products, a new mold which can be applied for molding shallow boxes was designed and manufactured, and the advantages of this mold were investigated. It was found that heat and cool molding using this mold minimizes undesirable phenomenon such as weld-lines, flow-marks, and silver streaks, and that molded products made by this method have excellent shiny faces on all sides. In addition, heat and cool molding using high impact polystyrene and glass fiber reinforced polycarbonate has been attempted. Compared to normal molding, molded products with smooth surfaces and minimized exposure of rubber particles and glass fibers to the molded product surface have been obtained.