Method of preforming a cover member of a can-shaped container

Details Method of preforming a cover member of a can-shaped container Method of preforming a cover member of a can-shaped container

1989-10-06

1990-10-23

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

To produce composite, plural part or multilayered article

264250, 264255, 264269, 264323, B29C 4516

Patent

active

049650351

ABSTRACT:
A method of preforming a cover for a can. The cover is formed from a planar base having a metallic barrier layer and resin layers on either side thereof. The base is first premolded to have a flat bottom recess, a cylindrical sidewall, and preferably an upper flap portion. In the premolding the base is stretched no more than by a factor of 1.8. Then a resin is injection molded over the premolded base to form either a uniform bottom cover or a top cover with a tab.

REFERENCES:
patent: 2425390 (1947-08-01), Palmer et al.
patent: 3280238 (1966-10-01), Calvert
patent: 3597298 (1971-08-01), Stengle, Jr.
patent: 4225553 (1980-09-01), Hirota et al.
patent: 4416716 (1983-11-01), Ichikawa et al.
patent: 4616766 (1986-10-01), Miyauchi et al.

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