MOLDS AND GAS INJECTION MOLDING METHOD

PURPOSE:To reduce a cost of a hollow molded form by drawing a plurality while obtaining moldability. CONSTITUTION:Resin flows from a resin gate 36 as a submarine gate to cavities 50, 52, 54, 56 through a starting part 28 to flow the respective cavities and stops at a rear false part 62. After the flow of the resin is completed, pressurized gas starts to flow from the part 62 into the resin to flow in the resin toward the part 62. Thus, an S-shaped tube is obtained as a hollow molded form. Gas flowing from a gas gate 24 is altered in its direction at the part 28, and its direction altering angles are the same in all the cavities. The cavities are disposed at equal distance positions from the part 28. Accordingly, the gases for feeding in the resin in the cavities are made uniform in all the cavities. Excellent gas pressure balance can be obtained among the cavities.