Carton having buckle-controlled brim curl and method and...

B - Operations – Transporting – 65 – D

Patent

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Details

B65D 3/28 (2006.01) B31B 17/00 (2006.01) B31F 1/00 (2006.01)

Patent

CA 2227372

A container is formed of paperboard having a caliper of at least approximately 0.007 inches, a rolled brim arc length of less than about 0.25 inches, an outer radius of curvature of the container cut through the plane normal to the axis of the rolled brim arc length adjacent the rolled brim being less than approximately 1.5 inches, and the paperboard material having at least approximately 8 lbs/3,000 square foot ream of size press adhesive. The container is formed by providing a paperboard shell (128) having an unfinished edge (126); urging the unfinished edge (126) into a forming surface of a forming die (110) and controlling an initial buckling point (138) of the unfinished edge (126) of the paperboard shell (128) such that a defect free prolate rolled toroidal brim is formed. The container may also include a styrene-acrylic primer coating to significantly improve bonding between the paperboard and a polymer outer coating.

Récipient réalisé en carton de papier d'une épaisseur minimale d'environ 0,007 pouces. Le rebord roulé présente une longueur d'arc inférieure à environ un quart de pouce. Le rayon de courbure externe du récipient, selon la section transversale à l'axe de la longueur de l'arc du rebord roulé, contiguë à ce rebord roulé, est inférieur à environ 1,5 pouces. Le carton utilisé renferme au moins 8 livres d'adhésif d'encollage environ par rame de 3000 pieds carrés. Le récipient est réalisé à partir d'une coque en carton (128) présentant un bord non fini (126). Le bord non fini (126) est comprimé contre la face d'un flan de formage (110). Le point initial de repliement (138) du rebord non fini (126) de la coque de carton (128) est déterminé de telle sorte que l'on obtient un rebord roulé en forme de tore en saillie exempt de défaut. Le récipient peut également être revêtu d'un apprêt styrène-acryle, qui améliore considérablement la cohésion entre le carton et un revêtement polymère externe.

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