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US 7,063,771 B2Granted
Embossed insulating paperboard
AssigneeWeyerhaeuser Company
InventorsDonald D. Halabisky, William C. Johnston, Jr.
Life of this patent
Estimating the term…
Abstract
An insulating paperboard contains at least one layer of cellulose fibers. The one layer is at least partially composed of bulky fibers. The paperboard is sufficiently insulated to provide a hot water ΔT across the paperboard of at least 0.7° C.±2.3° C. per 0.1 mm of caliper. The paperboard may be embossed to decrease surface transmission of heat. A hot cup may be produced from the insulating paperboard.
Claims6
An embossed insulating paperboard comprising:
- at least one layer of cellulose fibers, at least some of the cellulose fibers in said at least one layer being crosslinked cellulosic fibers present in an amount from 25% to 100% of said at least one layer, said paperboard being sufficiently insulating to provide a hot water ΔT across said paperboard of at least 0.70° C.±2.30° C. per 0.1 mm of caliper, said paperboard having a density of less than 0.5 g/cc, and a basis weight of from 200 gsm to 500 gsm, said paperboard being embossed with a surface pattern to reduce the effective surface area of the paperboard, the caliper of said paperboard being greater than or equal to 0.5 mm.
Dependencies are inferred from the claim text.