Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1996-09-26
1998-07-07
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Shaping against forming surface
425566, 425575, 425590, 26432811, B29C 4526
Patent
active
057764077
ABSTRACT:
A mold assembly has a fixed mold incorporating a base with a movable member supported thereon so as to be movable relative thereto and which is closed against a movable mold by a spring. A protrusion on the base passing through the movable member, and a recess on the movable mold engage to form a cavity. A runner and a gate are formed between the movable member and movable mold. Resin is filled into the cavity with the mold lightly closed and the movable member and movable mold closed, but with the movable member and base apart. During filing, the movable member and base open under resin pressure which is held constant inside the cavity. The movable member and base are then closed and when the gate closes with engagement of the protruding and recess portions, a constant amount of resin remains in the mold cavity, which is then compressed.
REFERENCES:
patent: 4290744 (1981-09-01), Dannels et al.
patent: 4900242 (1990-02-01), Maus et al.
patent: 4979891 (1990-12-01), Kitamura
patent: 5015426 (1991-05-01), Maus et al.
patent: 5068065 (1991-11-01), Maus et al.
patent: 5093049 (1992-03-01), Uehara et al.
patent: 5385461 (1995-01-01), Machida
patent: 5415817 (1995-05-01), Shiao et al.
patent: 5472334 (1995-12-01), Takahashi
patent: 5476629 (1995-12-01), Yabe et al.
Heitbrink Jill L.
Mitsubishi Materials Corporation
LandOfFree
Injection molding apparatus and method for shutting gate and com does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Injection molding apparatus and method for shutting gate and com, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Injection molding apparatus and method for shutting gate and com will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1202212