PURPOSE:To effectively draw out gases generated and air in an expanded molding due to the increase in the volume of the expanded molding by a method in which gases generated between the skin and core of an expanded molding are introduced through the holes of the core into the core and drawn out to the outside of the mold through a degassing pipe from the inside of the core. CONSTITUTION:A gas-impermeable skin 2 is attached to the inner surface of an expansion mold 1, and a core 4 and a stay 5 in combination are inserted into the mold 1. A insert 6 is set along the end of the skin 2. A degassing pipe 11 is inserted into venting holes 3 and 2a and a pipe hole 8. When an expandible raw liquid 9 is cast into the space inside the skin 2, it is gradually expanded and packed orderly from below to above. In this case [arrow mark (a)], gases generated and air flow through the hole 4 of the core 4 into the core 4, pass through the pipe 11 and venting holes 2a and 3, and are directed to the outside of the mold 1 [arrow mark (b)]. After removing the mold [arrow mark (c)], the pipe 11 is drawn out or the projected portion is cut off.
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