Carton with tightly sealed end closures

US3981432A · kind A · utility

Assignee

• The Bergstein Packaging Trust · US

Inventors

• Frank D. Bergstein · Cincinnati, US
• Robert Nerenberg · Middletown, US

Key dates

• Filing date: May 8, 1975
• Grant date: Sep 21, 1976
• Expiry date: May 8, 1995

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B65D5/727
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

A tightly sealed carton structure wherein an opposing pair of innermost end closure flaps are hingedly connected to the carton body walls along lines of articulation defining inwardly projecting ridges, the innermost closure flaps each comprising first and second flap parts hingedly connected together with the second flap part reversely folded and adhesively secured to the undersurface of the first part to form a double thickness reinforcing flap, the second flap part being of a length such that its free end edge coincides with the projecting ridge of the line of articulation connecting the flap to the carton body, the free end edge of the second flap part being in wedging engagement with the ridge defining line of articulation when the double thickness flap is infolded at right angles to the carton body wall, thereby providing an essentially rigid planar supporting surface over which the remaining end closure flaps may be folded and tightly sealed; the second flap parts preferably have laterally projecting ears at their free end edges, the ears being bent inwardly and wedged into the corners of the carton to seal against leakage of contents at the corner edges of the juxtaposed an…