Gas-feeding device for injection molding

摘要

A gas-feeding device comprising (A) a gas-feeding nozzle (20) and (B) gas-feeding nozzle shifting means (26) for putting a top portion (20A) of the gas-feeding nozzle (20) in forward and backward movement in a guide portion (16) which is provided in a mold (14) and communicates with a cavity (18) and an outside of the mold, the gas-feeding device being used for feeding a pressurized gas through the gas-feeding nozzle (20) into a molten resin injected into the cavity (18) of the mold attached to an injection molding machine for producing a molded article having a hollow portion, characterized by that: a clearance (d1,d2) is provided between the top portion (20A) of the gas-feeding nozzle (20) and the guide portion (16), and at least part of the top portion (20A) of the gas-feeding nozzle (20) is out of contact with the guide portion (16) when the molten resin is injected into the cavity.