Patent ID: 8337186

Claim:
A method for molding a resin foam product comprising: feeding a molten foamable resin by injection in a cavity formed by cavity surfaces of a molding die; allowing the molten foamable resin fed in the cavity to flow in the cavity so as to substantially fill the cavity; and foaming and solidifying the molten foamable resin substantially filling the cavity to mold the resin foam product, wherein the molding die has a welding portion corresponding to a weld generated in the resin foam product where a plurality of flows of the molten foamable resin meet and weld to each other, and an upstream portion, which includes a first upstream portion and a second upstream portion, adjacent to the welding portion and upstream of the welding portion in a flow direction of the molten foamable resin, and flow rate control is performed in such a manner that a flow rate of the molten foamable resin at the welding portion is equal to or higher than a flow rate of the molten foamable resin at the upstream portion, the molding die includes at least two restrictions where a cross-sectional area of a flow path of the molten foamable resin is reduced in a position between the welding portion, which is located at approximately a center of the cavity and between the first and the second upstream portions.