Food tray and method of making the same

Details Food tray and method of making the same Food tray and method of making the same

1992-12-30

1994-06-07

Lesmes, George F.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

428 369, 428 3692, 219734, 220 423, 220DIG12, 220DIG14, B32B 108, B65D 600

Patent

active

053188101

ABSTRACT:
A food container thermoformed from nucleated polyethylene terephthalate sheet. The food container comprises an opaque or colored tray formed from nucleated polyethylene terephthalate in a crystalline state so that the tray remains rigid at elevated temperatures. The food container also comprises a substantially transparent cover formed from nucleated polyethylene terephthalate in an amorphous state. The food container also comprises a hinge that connects the cover to the tray. The method for producing this food container comprises the steps of extruding nucleated polyethylene terephthalate into a continuous sheet; independently controlling the temperature of the mold portions for the cover, tray and hinge components of the food container; thermoforming the nucleated polyethylene terephthalate sheet; maintaining the tray component of the container at a temperature sufficient to crystallize the nucleated polyethylene terephthalate in the tray component; and cooling the cover component of the container to a temperature sufficient to produce nucleated polyethylene terephthalate in an amorphous state.

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