Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Positioning of a mold part to form a cavity or controlling...
Patent
1995-02-17
1996-08-06
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Positioning of a mold part to form a cavity or controlling...
2643281, 425149, 425555, B29C 4577
Patent
active
055430937
ABSTRACT:
A method and an apparatus for injection-molding a molten resin wherein any flaw such as warpage, shrinkage or the like does not occur in products having a small thickness when the desired product of injection molded resin is molded by injecting the molten resin into a cavity of an injection molding die. The molten resin is injected into the cavity under proper control with respect to injection speed and pressure, the pressure of the molten resin being temporarily set and reduced to a preset reference value when the cavity is filled with the molten resin, and subsequently, the pressure of the molten resin filled in the cavity is released.
REFERENCES:
patent: 4146601 (1979-03-01), Bishop
Minamimura Masaaki
Nakamura Nobuyuki
Shiozawa Fumio
Yamagiwa Yoshitoshi
Nissei Plastic Industrial Co. Ltd.
Vargot Mathieu D.
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