초록 ▼

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 con

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.

대표청구항 ▼

[ I claim:] [1.] A paperboard container having a rolled brim, the container including;a caliper of paperboard material forming the container of at least approximately 0.007 inches;an arc length of the rolled brim of less than about 0.25 inches;an outer radius of curvature of the container cut throug

[ I claim:] [1.] A paperboard container having a rolled brim, the container including;a caliper of paperboard material forming the container of at least approximately 0.007 inches;an arc length of the rolled brim of less than about 0.25 inches;an outer radius of curvature of the container cut through a plane normal to the axis of the rolled brim arc length adjacent the rolled brim of less than approximately 1.5 inches; andsaid paperboard material comprises at least approximately 8 lbs/3,000 ft.sup.2 ream of size press adhesive.