Method and device for mold press forming

Details Method and device for mold press forming Method and device for mold press forming

1993-04-05

1995-02-14

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

2643287, 2643288, 425145, 425560, 425562, 425573, 425575, B29C 4528, B29C 4576

Patent

active

053893158

ABSTRACT:
In a method and device for mold press forming involving distribution of molten resin within a mold including a plurality of valve gates, deformation of the product and generation of excessive burrs and voids are prevented by accurately distributing a prescribed amount of resin material to each valve gate by detecting the amount of molten resin supplied from an injection unit and controlling the opening timing and period of each valve gate. The amount of molten resin supplied from the injection unit can be conveniently evaluated by detecting the displacement of an in-line screw used in the injection unit. By providing a metering arrangement for each of the valve gates, the molten resin can be even more accurately distributed to each of the valve gates.

REFERENCES:
patent: 2840856 (1958-07-01), Moxness
patent: 4364878 (1982-12-01), Laliberte et al.
patent: 4595552 (1986-06-01), Hahn
patent: 4846651 (1989-07-01), Matsuda et al.
patent: 5057255 (1991-10-01), Sato et al.

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