Food tray and method of making the same
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United States of America Patent
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-
Jun 7, 1994
Grant Date -
N/A
app pub date -
Dec 30, 1992
filing date -
Dec 30, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A food container thermoformed from co-extruded polyethylene terephthalate sheet, a portion of which contains a nucleating agent. 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 non-nucleated polyethylene terephthalate in an amorphous state. The food container also comprises a hinge that integrally connects the cover to the tray. The method for producing this food container comprises the steps of co-extruding nucleated and non-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 polyethylene terephthalate sheet; maintaining the tray component of the container at a temperature sufficient to crystallize the polyethylene terephthalate in the tray component; and cooling the cover component of the container to a temperature sufficient to produce polyethylene terephthalate in an amorphous state.
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