B - Operations – Transporting – 65 – D
Patent
B - Operations, Transporting
65
D
217/163
B65D 1/00 (2006.01) B29C 51/30 (2006.01)
Patent
CA 1242999
ABSTRACT A carton with a hinged cover formed from a plastic sheet material has a locking device which comprises a continuous, rigid locking member formed integrally with the bottom section of the carton which extends upwards from the bottom section with a forward-facing extension on the top for engaging with corresponding locking apertures formed in the cover. The cartons are particularly useful for packaging eggs since they permit eighteen-cell cartons to be packed on conventional packaging equipment normally used for twelve-cell cartons. The locking apertures are formed in plastic resin sheet material during a thermoforming process by shearing the heated plastic sheet between shear members which have cooperating shear faces extending in two dimensions in a plane perpendicular to the direction of movement of the thermoforming dies. The resulting apertures have a three dimensional configuration.
486603
Gowling Lafleur Henderson Llp
Tenneco Packaging Inc.
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