Gas assist injection molding apparatus and method with multiple

Plastic and nonmetallic article shaping or treating: processes – With step of cooling to a temperature of zero degrees c. or...

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264 401, 264 403, 264572, 425130, 425145, 425146, 425155, 425160, B29C 4572, B29C 4576

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active

057283257

ABSTRACT:
A supply of pressurized gas is separated into a first quantity of pressurized gas at a first temperature and a second quantity of pressurized gas at a second lower temperature. The first and second quantities of gas are injected into molten plastic in an injection mold in a predetermined sequence to form a hollow molded plastic article. A controller independently controls the pressure and time of delivery of the first and second quantities of pressurized gas supplied to the mold. A third quantity of extremely lower temperature gas may also be supplied to the mold in a timed sequence with the first and second quantities of gas. A variable pressure regulator receives stored pressure signals from the controller and establishes the pressures of the first, second and the optional third quantities of gas independent of each other.

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