| 摘要 |
PROBLEM TO BE SOLVED: To produce a resin molded product having a hollow part large in its cross-sectional area and hollow ratio and good in appearance quality without using a mold having a complicated shape. SOLUTION: In a method for producing a molded product having a hollow part 22 at a predetermined part by a gas injection molding method wherein a molten resin is injected in the mold cavity formed by closing a pair of molds and gas is subsequently injected into the molten resin, gas is injected from a plurality of places appoaching each other within the cavity to form one hollow part 22 and, further, a movable core 3 arranged in the cavity is moved by the molten resin into which the gas is injected.
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