| 摘要 |
PURPOSE:A heavy walled expanded body containing the filler is molded excellently by keeping a mold cavity pressure condition by gas, prior to injection of the synthetic resin containing the filler and the blowing agent. CONSTITUTION:After heat plastization of the synthetic resin containing the blowing agents is molded the expanded profile by injecting it to a mold cavity. Then, more than 10 weight percent of a filler which is not able to dissolve a synthetic resin in uniform and a synthetic resin containing the blowing agent of 0.5-5 weight percent are injected in not enough volume to fill a mold cavity into the cavity formed by a cooled mold in keeping the pressure condition by gas prior to injection of the synthetic resin. During or directly after the synthetic resin, the pressure condition by gas in the mold cavity is released. As the filler are used a gummy grain, a glass fibre and a calcium carbonate powder and others. |
