| 摘要 |
PURPOSE:To mold a resin foaming body consisting of upper and lower two layers each different in their hardness without the necessity of high speed and high pressure injection of a resin material while preventing the mixture of both resin materials by injecting respective different hardness foaming resin materials to the separated parts of the cavity of a lower die. CONSTITUTION:A low hardness urethane resin material 11 is injected in a certain quantity from a injector 4 to the part 6 b corresponding to the surface configuration of a cushion material in the cavity 6 of the lower die 7 and then foamed, and after molding the low hardness urethane resin foaming body 2 of an upper layer to the bottom part of the part 6 b, a high hardness urethane resin material 12 is injected from a injector 5 to the resin injection part 6 c in the cavity of the lower die, and clamping for the lower die 7 and the upper die 9 is performed to foam them. The urethane resin material 12 is expanded to the side of the part 6 b corresponding to the surface configuration of the cushion material in the lower die cavity 6 from the resin injection part 6 c, and then fills up the space between the low hardness urethane resin forming body 2 existing in the bottom part thereof and the lower surface of the upper die 9, further, sticked integrally with the low hardness urethane resin foaming body 2, thus a high hardness urethane resin foaming body 1 is molded. |
