Method of producing a hollow resin body and apparatus therefor

Details Method of producing a hollow resin body and apparatus therefor Method of producing a hollow resin body and apparatus therefor

1996-03-18

1998-08-25

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 4572

Patent

active

057980802

ABSTRACT:
After molten resin is injected into a mold cavity, an inert gas is sent from an inert gas supply device into the molten resin through a change-over valve and a gas nozzle device so that the molten resin is injection molded. At the same time, a tub is filled with part of the molten resin through a tub communication path. Thereafter, a burr portion of the injection-molded resin is bored using a boring punch so as to make a space within the hollow resin body communicate with the atmosphere. Next, the change-over valve is switched to send a cooling gas from a cooling gas supply device to the hollow space within the hollow resin body so as to cool the injection-molded resin.

REFERENCES:
patent: 3694424 (1972-09-01), Hunkar et al.
patent: 5090886 (1992-02-01), Jaroschek
patent: 5098637 (1992-03-01), Hendry
patent: 5354523 (1994-10-01), Shah
patent: 5607640 (1997-03-01), Hendry
patent: 5612067 (1997-03-01), Kurihara et al.

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