| 摘要 |
PURPOSE:To obtain a thin-wall foamed and molded item that is good in surface smoothness, by injecting a thermally plastisized unfoamed synthetic resin that contains a foaming agent into a mold cavity at a speed of a specified injection rate into which hot air having a specified temperature is fed, and recovering the hot air after the completion of the injection. CONSTITUTION:A thermally plastisized unfoamed synthetic resin that contains a foaming agent is fed from a hopper 2 and is forced in an extruder 1 with said resin unfoamed so that said resin is fed via a check valve 3 to a resin chamber 4. Then the resin is injected by a piston 6 at a speed of an injection rate of 800cc/sec or over into the mold cavity 10 into which hot air that has been heated to 50-250 deg.C by a heater 21 has been fed so that the resin is foamed and molded, and after the completion of the injection, the hot air is recovered by a suction pump 17 and the intended foamed and molded item can be obtained. |
