| 摘要 |
PURPOSE:To greatly reduce the cost of nitrogen gas account for the cost of a molded product, by method wherein a cyclone filter possessing an inside filter close by an outlet of recovery gas is fitted to gas recovery piping. CONSTITUTION:Gas pressed into molten synthetic resin within a mold is recovered and reused. On this occasion, a cyclone filter 1 possessing an inside filter close by an outlet of recovery gas is fitted to gas recovery piping, a resin layer to be accompanied by the recovery gas is removed, high pressure gas obtained by recompressing the recovery gas is pressed into the molten synthetic resin in a mold. |
