Method for cold-forming plastic sheet

Details Method for cold-forming plastic sheet Method for cold-forming plastic sheet

1977-02-23

1978-01-31

Kucia, Richard R.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Plural sequential shaping or molding steps on same workpiece

264163, 264292, 264296, 264320, B29D 2312

Patent

active

040715981

ABSTRACT:
A method of cold-forming a thermoplastic sheet to provide a circular container part such as a lid or dish comprising the steps of engaging a sheet of thermoplastic material between opposing concentric die members, drawing the sheet around the circular edge of one of the die members to provide a concentric central portion and a concentric annular depending skirt having a proximal edge adjacent the central portion, an intermediate portion, and a distal free edge, provide an annular void in the die members adjacent the skirt, then moving the free edge toward the proximal edge while holding the proximal edge to buckle the said intermediate portion into the void. In the apparatus, the void has a tapered surface inclining radially outwardly and axially toward the proximal edge to hold the free edge radially inwardly, thereby to permit the intermediate portion to buckle outwardly into the void.

REFERENCES:
patent: 3054144 (1962-09-01), Goodwin
patent: 3370118 (1968-02-01), Lowe
patent: 3418690 (1968-12-01), Edwards
patent: 3532785 (1970-10-01), Johnson
patent: 3634579 (1972-01-01), Matras

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