Foam egg carton

Details Foam egg carton Foam egg carton

1981-02-17

1983-05-10

Dixson, Jr., William T.

Envelopes, wrappers, and paperboard boxes

Paperboard box

Box material includes a coating or a nonpaperboard...

229 44EC, 229 45EC, 217 265, B65D 124

Patent

active

043825362

ABSTRACT:
An egg carton made from expanded polystyrene with a nonexpanded skin on one side includes integrally formed cover and tray portions interconnected together by a pair of hinges adjacent opposite sides of a hingeband. The tray is divided into a plurality of cells by a plurality of partitions. At least some of the partitions have a top flap portion hinged to the top of the partition by the skin of the polystyrene. Each cell further has a pliant inside surface provided by one or more grooves in the interior cell walls. A post extending from the inside surface of the cover is formed opposite a tray support surface using a thermo molding method by which a protrusion in a top mold is inserted into a nonvented cavity of a bottom mold. A pair of integrally molded hinge posts extend above the hingeband a distance less than the width of the hingeband between hinges and seat into a groove in the hingeband when the top is in closure relationship to the tray.

REFERENCES:
patent: 2885136 (1959-05-01), Grant
patent: 3034693 (1962-05-01), Cox
patent: 3120319 (1964-02-01), Buddrus
patent: 3185370 (1965-05-01), Reifers et al.
patent: 3563446 (1971-02-01), Lake
patent: 4059219 (1977-11-01), Reifers et al.

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