Method For Forming A Rim And Edge Seal For An Insulating Cup
AssigneeWeyerhaeuser Company
InventorWilliam C. Johnston
Life of this patent
Estimating the term…
Abstract
A container such as a paper cup is formed from a thick paperboard blank. The blank has a predetermined thickness and has a top edge, side edges, and a bottom edge. The regions adjacent at least one, and preferably all, of the top edge and first and second side edges are compressed along the length thereof. When the regions adjacent the side edges are overlapped, a reduced thickness side seam is formed. When the compressed region adjacent the top edge is curled to form the upper lip, a lip of lesser thickness is formed than otherwise would be formed from the paperboard material.
Claims11
A blank for forming a container, comprising:
- an insulating paperboard blank comprising cross-linked fibers, said paperboard blank having a predetermined thickness, said paperboard blank having side edges, a top edge, and a bottom edge, said blank adjacent at least one of said edges being compressed to a thickness less than said predetermined thickness.
A method for forming a container from a paperboard blank, comprising:
- forming and cutting an insulating paperboard blank comprising cross-linked fibers from a sheet of paperboard, said paperboard blank having a predetermined thickness, said paperboard blank having side edges, a top edge and a bottom edge;
- compressing said paperboard blank adjacent at least one of said edges to form a strip of paperboard having a thickness less than said predetermined thickness;
- and
- forming a container from said blank including a curled lip.
A container comprising:
- an insulating paperboard blank comprising cross-linked fibers formed into a container, said blank having first and second side edges, a top edge, and a bottom edge, the strip of material adjacent at least one of said top edge, said first side edge, and said second side edge being compressed along the length thereof, the regions adjacent the side edges being overlapped and adhered to each other to form a side seam, the strip adjacent said upper edge being curled to form a lip.
Dependencies are inferred from the claim text.