Method of manufacturing low-rigid, wrinkle-free articles

Details Method of manufacturing low-rigid, wrinkle-free articles Method of manufacturing low-rigid, wrinkle-free articles

1978-07-03

1980-09-30

Arnold, Donald J.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Stretching or stretch forming

264316, 264320, 264322, 264337, 425398, B29C 1702, B29C 2500

Patent

active

042255538

ABSTRACT:
A thin sheet having a low rigidity is drawn while being depressed over the radiused corner of a die by elastic force or hydrostatic force to obtain a formed article whose sidewall part and flange part have no wrinkles. The force is applied through an elastic rubber provided around the punch and having an outside diameter larger than the inside diameter of the die cavity, or through an annular rigid body on which elastic pressure or fluid pressure is exerted. The hardness of the rubber is preferably approximately 70 to 85 in accordance with ASTM D 2240 Durometer A. A laminate not more than about 200 .mu.m in thickness and consisting of a thermoplastic resin film, aluminum foil and a heat-sealable resin film is drawn into a formed article or a container which is light in weight and suitable for containing foods, for instance.

REFERENCES:
patent: 2697057 (1954-12-01), Senger et al.
patent: 3207821 (1965-09-01), Hinton et al.
patent: 3340714 (1967-09-01), Pohl et al.
patent: 3932575 (1976-01-01), Andersson

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