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
1988-08-17
1989-05-02
Silbaugh, Jan H.
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, 2643289, 425149, B29C 4577
Patent
active
048266418
ABSTRACT:
In an injection molding process, male and female dies are first clamped together by a prescribed clamping force to provide surfaces defining a cavity of a prescribed extruded area therebetween. Then, a molten resin is injected at a prescribed injection pressure into the cavity until the cavity is filled with the molten resin. Subsequently, the molten resin filled in the cavity is held at a prescribed holding pressure, so that the resin within the cavity solidifies to produce a molded article. The injection pressure in the injecting step is controlled so as to decrease immediately before the cavity is filled with the molten resin to thereby prevent a pressure boost from occurring upon the termination of the injecting step. The holding pressure in the holding step is controlled in such a manner that a maximum of the pressure of the resin within the cavity in the holding step is higher than a maximum of the pressure of the resin within the cavity in the injecting step.
REFERENCES:
patent: 2685708 (1954-08-01), Pollack
patent: 3632729 (1972-01-01), Bielfeldt
patent: 4205950 (1980-06-01), Suss et al.
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patent: 4313901 (1982-02-01), Chu
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patent: 4609516 (1986-09-01), Krishnakumar et al.
"Moulage Par Injection Mesure de la Pression a l'interieur du mobile", Caoutchoucs et Plastiques, No. 634, Oct. 1983, pp. 59-61.
Takeda Yoshinobu
Yamamoto Kunio
Fertig Mary L.
Mitsubishi Kinzoku Kabushiki Kaisha
Silbaugh Jan H.
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