Injection molding method for an injection molding machine

Details Injection molding method for an injection molding machine Injection molding method for an injection molding machine

1998-05-28

2000-03-28

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

2643281, 36447505, 425145, B29C 4577

Patent

active

060427604

ABSTRACT:
An injection molding method for an injection molding machine in which molten resin in an injection barrel is injected and charged into a cavity of a mold through advancement of a screw in order to form a thin molding product. When the screw reaches a first set point that is set in advance and corresponds to completion of charge during the advancement of the screw, the screw is immediately and forcibly retracted to a second set point that is set in advance. With is operation, when the screw reaches the first set point X1 corresponding to completion of charge during the advancement of the screw, the internal pressure of the cavity is relieved quickly. Therefore, the cavity, which has deformed due to high pressure resin, is restored to its designed shape before the resin solidifies.

REFERENCES:
patent: 5554326 (1996-09-01), Nakazawa et al.
patent: 5770131 (1998-06-01), Bubel et al.
patent: 5786999 (1998-07-01), Spahr et al.
patent: 5814251 (1998-09-01), Arai et al.

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