Method of injection molding with air assist for making a handle-

Details Method of injection molding with air assist for making a handle- Method of injection molding with air assist for making a handle-

1992-05-01

1994-05-03

Timm, Catherine

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

With internal application of fluid pressure

425130, B29C 4518

Patent

active

053085744

ABSTRACT:
A method for producing a handle-shaped molded article (1) having a thick grip portion (2) and at least one thick fitting portion (3) by injection molding using an injection molding apparatus (10) equipped with a mold having a cavity (60), a resin gate (46) provided in a portion (62) where the fitting portion is to be formed and a gas inlet (48) provided in a portion (64) where the grip portion is to be formed. A hollow structure (4) is formed in the grip portion (2) and a solid structure is formed in the fitting portion (3) by injecting a molten resin into the cavity (60) through the resin gate (46), thereby filling molten resin in a fitting portion-forming cavity zone formed of that portion (62) of the mold where the resin gate is provided and the fitting portion is to be formed and further filling molten resin in part of the rest of the cavity. A pressurized gas is introduced into the cavity (60) through the gas inlet (48) while maintaining an injection pressure, P, at a predetermined value, the injection pressure, P, being defined by

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