| 摘要 |
PURPOSE:To obtain a molding thin and high in the finish accuracy by directly heating foaming polystyrene particles once foamed in a low expansion ratio in the mold without use of heated steam. CONSTITUTION:Foaming polystyrene particles which have been foamed primarily in a low expansion ratio (e.g. up to about 20 times) fill between male and female molds 1 and 2 tightly closed beforehand on the carrier air from a filling port 7 while air is exhausted through an exhaust slit 9. Then, the molds 1 and 2 are heated without use of heated syteam to effect heating, foaming and molding of the polystyrene filled through the molds 1 and 2. Thus, a foaming polystyrene molding under 5mm thick can be produced. Being thin, this can be sufficiently heated by direct heating with the mold to yield a molding with a high accuracy having a proper intra-particle density. |
