Method of molding a bobbin for a ballast

Details Method of molding a bobbin for a ballast Method of molding a bobbin for a ballast

1989-02-27

1992-06-09

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

26432812, B29C 4526

Patent

active

051204860

ABSTRACT:
A method for molding a plastic bobbin is described comprising the steps of injecting a fluid plastic material into the opposite ends of an elongated cavity formed in the mold with the elongated cavity serving as an internal molding runner during the injection process and which forms a lamination compression ridge in the finished product.

REFERENCES:
patent: 2799435 (1957-07-01), Abplanalp
patent: 3421730 (1969-01-01), Woods et al.
patent: 3995008 (1976-11-01), Spiegelberg
patent: 4382522 (1983-05-01), Shimazu et al.
patent: 4450132 (1984-05-01), Ettema et al.
patent: 4743420 (1988-05-01), Dutt

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