Carton having buckle-controlled brim curl and method and blank f

Details Carton having buckle-controlled brim curl and method and blank f Carton having buckle-controlled brim curl and method and blank f

1997-07-14

1999-09-21

Coan, James F.

Manufacturing container or tube from paper; or other manufacturi

Container making

Rigid container

493328, 493467, B31B 128, B31B 144, B31B 174

Patent

active

059546247

ABSTRACT:
A paperboard container and method of forming such container having a rolled brim is disclosed. The container being formed of a paperboard material 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 with the paperboard material forming the container having at least approximately 8 lbs/3,000 ft.sup.2 ream of size press adhesive included therein and preferably approximately 13 lbs/3,000 ft.sup.2 ream of paperboard material. One particular container includes dimensions wherein the 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 is approximately 1.25 inches while an inner radius of curvature of the container cut through the plane normal to the axis of the rolled brim arc length adjacent the rolled brim is at least 1.09 inches. Such a container is formed by initially providing a paperboard shell formed from a paperboard blank having an unfinished annular exposed edge; directing the unfinished annular edge into a forming surface of a forming die; urging the unfinished annular edge into the forming die and controlling an initial buckling point of the unfinished annular edge of the paperboard shell such that a substantially defect free prolate rolled toroidal brim is formed.

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