Embossed insulating paperboard

• US 7,063,771 B2
• Filed: 05/14/2004
• Issued: 06/20/2006
• Est. Priority Date: 04/04/2003
• Status: Expired due to Fees

• Current Assignee: Weyerhaeuser Company (Weyerhauser)
• Original Assignee: Weyerhaeuser Company (Weyerhauser)
• Inventors: Johnston, William C. Jr., Halabisky, Donald D.
• Primary Examiner(s): Fortuna, José A.
• Application Number:
  US10/846,760
• Publication Number:
  US 20040213961A1
• Time in Patent Office: 767 Days
• Field of Search: 162/109, 162/117, 162/123, 162/125, 162129-133, 162/100, 162/157.1, 162/141, 162/149, 162/146, 156/209, 156/219, 428533-536, 428/537.5, 428 341- 343, 428/156, 428/292.1
• US Class Current: 162/117
• CPC Class Codes: B32B 1/00 Layered products having a non-planar shape
• CPC Class Codes: B32B 2262/062 Cellulose fibres, e.g. cotton
• CPC Class Codes: B32B 2307/304 Insulating
• CPC Class Codes: B32B 2307/718 Weight, e.g. weight per square meter
• CPC Class Codes: B32B 2307/72 Density
• CPC Class Codes: B32B 2307/7265 Non-permeable
• CPC Class Codes: B32B 2439/02 Open containers
• CPC Class Codes: B32B 27/12 next to a fibrous or filamentary layer
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 29/00 Layered products comprising a layer of paper or cardboard
• CPC Class Codes: B32B 29/02 next to a fibrous or filamentary layer
• CPC Class Codes: D21H 15/04 crimped, kinked, curled or twisted fibres
• CPC Class Codes: D21H 17/28 Starch
• CPC Class Codes: D21H 21/16 Sizing or water-repelling agents
• CPC Class Codes: D21H 21/18 Reinforcing agents
• CPC Class Codes: D21H 27/02 Patterned paper patterned coatings D21H19/66; embossing B31F1/07; prepared on the paper-making machines D21F11/00
• CPC Class Codes: Y10T 156/1039 Surface deformation only of sandwich or lamina [e.g., embossed panels]
• CPC Class Codes: Y10T 428/1303 Paper containing [e.g., paperboard, cardboard, fiberboard, etc.]
• CPC Class Codes: Y10T 428/24479 including variation in thickness
• CPC Class Codes: Y10T 428/31993 Of paper

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.

Claims

1. 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 Δ

T 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.

2. The embossed paperboard of claim 1, wherein said paperboard has a basis weight of from 250 gsm to 400 gsm.

3. The embossed paperboard of claim 1, wherein said paperboard has a basis weight greater than or equal to 250 gsm.

4. The embossed paperboard of claim 1, wherein said paperboard has a hot water Δ

T of 90°

C.±

2.3°

C. at a caliper of 0.6 mm and a hot water Δ

T of 14°

C.±

2.3°

C. at a caliper of 1.25 mm, said hot water Δ

T being a substantially linear progression relative to caliper in the temperature range from below 9°

C. to above 14°

C.

5. The embossed paperboard of claim 4, wherein said linear progression extends from a Δ

T of 9°

C. to a Δ

T of 14°

C.

6. The embossed paperboard of claim 1, wherein said paperboard is at least a two-ply board, said at least one ply containing said crosslinked cellulose fibers.