| 摘要 |
PURPOSE:To enable the decrease of the using volume of steam of a metal mold, by a method wherein in the expansion molding metal mold provided with a male mold and female mold to form a molding room, pipings for directly communicating the molding room to a steam source are connected to these male and female molds. CONSTITUTION:Many vent holes 27, 28 opened to the molding room 22 are provided at the male mold 20 and female mold 21 which form the molding room 22. Furthermore, pipings 30, 31 for directly communicating the molding room 22 to the steam source 34 are connected to the vent holes 27, 28 respectively. By this, steam supplied to each vent hole 27, 28 through pipings 30, 31 from the steam source 34, directly heats and expansions raw resin filled in the molding room 22. By this it becomes possible to decrease the using volume of steam in the metal mold for expansion molding.
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