Differential ply core for core wound paper products

Randy Gene Ogg

A two-ply core for core wound paper products. The inner ply of the core has more resistance to compression than the outer ply. The outer ply may have more resistance to tension than the inner ply. The two-ply core is suitable for use with core-wound paper products and particularly those which...

Inventor: Randy Gene Ogg
Assignee: The Procter & Gamble Company
Primary Examiner: William A. Rivera

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U.S. Classification
242/610.1; 138/144; 156/188; 156/195; 428/37

International Classification
B65H 7518

View patent at USPTO

Citations

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4026690	Forming tube for winding glass fibers and method for using same	May 31, 1977
4617022	Disposable hygienic article with removable belt	Oct 14, 1986
5027582	Compact, core-wound paper product and method of making	Jul 2, 1991
5167994	Reusable core for paper rolls	Dec 1, 1992
5292391	Corrugated paperboard strength enhancing process	Mar 8, 1994
5393582	Enhanced crush strength construction multi-grade paperboard tubes	Feb 28, 1995
5472154	High spiral angle winding cores	Dec 5, 1995
5505395	Multi-grade paperboard winding cores for yarns and films having enhanced resistance to inside diameter reduction	Apr 9, 1996
5545449	Polyether-reinforced fiber-based materials	Aug 13, 1996
5586963	Single-ply paperboard tube and method of forming same	Dec 24, 1996
5671897	Core for core wound paper products having preferred seam construction	Sep 30, 1997

Referenced by

Patent Number	Title	Issue date
6159564	Core and a method of manufacturing such	Dec 12, 2000
6851643	Spirally wound tube with enhanced inner diameter stiffness, and method of making same	Feb 8, 2005

Claims

What is claimed is:

1. A core for spirally wrapping paper products therearound, said core comprising an inner ply and an outer ply securely joined in face-to-face relationship,

said inner ply having more resistance to compression than said outer ply,

said core being prestressed.

2. A core according to claim 1 further comprising an elastic member.

3. A core according to claim 2 wherein said elastic member is a linear strand.

4. A core according to claim 3 having an inner surface and an outer surface, said linear strand backing applied to said inner surface of said inner ply.

5. A core according to claim 1 having an inner surface and an outer surface, said core being prestressed by a member joined to said outer surface of said outer ply.

6. A core according to claim 5, wherein said member expands in the presence of ambient humidity.

7. A core according to claim 1, wherein said inner ply and outer ply have different basis weights.

8. A core according to claim 7, wherein said inner ply has a greater basis weight than said outer ply.

9. A core for spirally wrapping paper products therearound, said core comprising an inner ply and an outer ply securely joined together in face-to-face relationship,

said inner ply and said outer ply each having a basis weight,

said inner ply and said outer ply being made of identical materials, but differing in the basis weights of said identical materials,

said inner ply having a greater basis weight than said outer ply.

10. A core according to claim 9, wherein said inner ply and said outer ply comprise liner board.

11. A core according to claim 10, wherein said inner ply and said outer ply are adhesively joined together.

Drawings

Drawing