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
1996-07-29
1998-06-30
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Positioning of a mold part to form a cavity or controlling...
2643287, 425145, 425150, B29C 4577
Patent
active
057729328
ABSTRACT:
A mold clamping control method capable of preventing any warp or strain on a molded product without stopping an injection pressure holding process so as to cancel the pressing force of an injection screw. In a series of injection and pressure holding processes, a movable platen is retracted from a mold clamping dwell position P2 to a mold opening dwell position P1, so that a substantial volume of a cavity of a mold is increased to temporarily lower the internal pressure of the cavity, thus making an internal stress of resin to be a product uniform to eliminate stress strains. In this method, an injection molding is performed to produce a precise product having no warp or strain even in molding a light guide plate which is subjected to molding abnormalities by the temporary stoppage of the injection pressure holding process according to the conventional method.
REFERENCES:
patent: 5002706 (1991-03-01), Yamashita
patent: 5015426 (1991-05-01), Maus et al.
patent: 5130075 (1992-07-01), Hara et al.
patent: 5176859 (1993-01-01), Leffew
patent: 5547619 (1996-08-01), Obayashi
Hosoya Yuichi
Kamiguchi Masao
Neko Noriaki
Senda Koji
Fanuc Ltd.
Heitbrink Jill L.
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