| 摘要 |
PURPOSE:To provide a molding method to reliably form a desired hollow form, in a resin molded product having hollow structure. CONSTITUTION:In a molding method where a hollow resin molded product is molded by injecting gas within molten resin filled into a mold cavity 2 form an injection molding machine 8, a gas injection mechanism 9 is provided on a filling end side of the mold, a resin accumulation part 6 whose capacity is changeable is provided on a downstream runner part 5 of the injection molding machine 8, gas is injected from the end side of the filled resin, the gas is infiltrated in the direction where a molten state is high and on this occasion, a part of the resin extruded by the gas is introduced into the injection side resin accumulated part 6. Then the resin in this resin accumulation part 6 is injected within the mold cavity prior to injection from the injection molding machine 8 at the next molding process. |
