Method of injection molding severing a looped gate passage

Details Method of injection molding severing a looped gate passage Method of injection molding severing a looped gate passage

1998-03-23

2000-09-05

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Flash or sprue removal type

2643289, 425553, 425DIG51, B29C 4538

Patent

active

061138282

ABSTRACT:
A high pressure multi-cavity injection molding system has an adjustable overflow cavity on each of the first to fill cavities. The volume of the overflow cavity is remotely adjustable without removing the overflow cavity from the system. In a mold system including a family of molds, the overflow cavities are sized so that the first to fill cavity(ies) and the overflow cavity(ies) fill at substantially the same pressure and time as the last to fill cavity. A looped gate passage is used to automatically sever the molded plastic at an edge of the cavities when the mold is opened. The looped gate passage does not constrict the flow of plastic into the cavities during the molding process.

REFERENCES:
patent: 3371385 (1968-03-01), Cordio et al.
patent: 3737271 (1973-06-01), Novak
patent: 4036571 (1977-07-01), Geyer et al.

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