Heat setting a thermoformed PET article utilizing a male plug as

Details Heat setting a thermoformed PET article utilizing a male plug as Heat setting a thermoformed PET article utilizing a male plug as

1981-11-16

1983-06-14

Dixon, Jr., William R.

Stock material or miscellaneous articles

Hollow or container type article

Cellular material derived from plant or animal source

264547, 264549, 264554, 264544, B29C 1704

Patent

active

043883567

ABSTRACT:
A process and apparatus for manufacturing a polyester container having good clarity and dimensional stability and which can be used in hot-fill food package manufacture and/or in making a container for reheating or heating the contents within. In particular, this process and apparatus is a deep stretch-forming technique for preparing biaxially oriented, heat set, sealable containers of high molecular weight polyethylene terephthalate. The process comprises deep drawing a preheated sheet of the polyester into a heated female cavity by means of a male plug. The part is heat set against the female cavity, and cooled against the male plug which is used as a constraint. The part is subsequently removed from the male plug.

REFERENCES:
patent: 3400111 (1968-09-01), Schwartz
patent: 3496143 (1970-02-01), Siggel et al.
patent: 3499188 (1970-03-01), Johnson
patent: 3737494 (1973-06-01), Wolf
patent: 3739052 (1973-06-01), Ayres et al.
patent: 3814784 (1974-06-01), Wolf
Beijen, "Solid-Phase Pressure Forming Process for Thin-Walled Polypropylene Containers", Plastics & Rubber Processing, Jun. 1979, pp. 66-70.
Polypropylene and Solid Phase Forming, Shell Chemical Company, Mar. 1981.

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