Method of forming a cup-like container

Details Method of forming a cup-like container Method of forming a cup-like container

1981-07-02

1983-05-31

Czaja, Donald E.

Plastic and nonmetallic article shaping or treating: processes

Utilizing heat releasable stress to reshape solid workpiece

264296, 264321, 264342R, 264DIG66, B29C 1300

Patent

active

043860443

ABSTRACT:
A method of making a one-piece container of heat shrinkable thermoplastic foam from sheet stock in which a longitudinally seamed cylindrical sleeve made from such material is placed on a forming mandrel providing the essential shape of the container. An end portion of the sleeve extends cantilever fashion beyond the mandrel. The sleeve is heated to soften it and shrink partially to conformity of the mandrel and shrink to a small elongate tube a fraction of the sleeve's original diameter. The heat softened sleeve is pressed against the bottom end of the mandrel to form a container bottom, and at the same time the other opposite end of the sleeve is upset to form a bead for the container opposite the bottom end.

REFERENCES:
patent: 4156710 (1979-05-01), Carroll et al.
patent: 4281979 (1981-08-01), Doherty et al.

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