Method for forming hollow articles from thermoplastic sheeting o

Details Method for forming hollow articles from thermoplastic sheeting o Method for forming hollow articles from thermoplastic sheeting o

1975-01-27

1976-08-17

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Stretching or stretch forming

264 89, 264 92, 264 94, 264313, 264314, B29C 112, B29C 1704, B29C 1706

Patent

active

039754936

ABSTRACT:
A method for using an expandable forming plug in forming apparatus such as plug assisted vacuum or pressure differential forming machines and the like wherein the plug cooperates with a mold to form hollow articles such as containers, closures, trays, and the like, from thermoplastic synthetic resinous film or sheeting. The expandable plug provides hollow articles which during forming can be programed or controlled, as desired, with respect to thickness distribution in the walls thereof and, more particularly, provides hollow articles with side and bottom walls of desired thickness, such as of substantially uniform or of a varying thickness.

REFERENCES:
patent: 2937403 (1960-05-01), Keith
patent: 3184524 (1965-05-01), Whiteford
patent: 3642415 (1972-02-01), Johnson

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