Core for core wound paper products having preferred seam construction
AssigneeThe Proctor & Gamble Company
InventorsRandy Gene Ogg, Martin Henry Stark
Life of this patent
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Abstract
A core for core wound paper products. The core is made by wrapping dual plies in a spiral pattern and adhering the plies together. The edge of one ply overlaps the ply gap of the other ply, preventing a single ply thickness from occurring anywhere on the core. Alternatively, the edge of each ply may overlap the ply gap of that respective ply. In yet another embodiment, the overlap may be formed by a separate ply applied to either ply.
Claims6
A two-ply core having a generally round cross-section with an inner circumference and an outer circumference, said core comprising an inner ply and an outer ply joined together in face-to-face relationship without an intervening ply therebetween, said inner ply and said outer ply each having a predetermined width defined by two edges and being spirally wound together to form a hollow cylinder having an inner ply gap or an outer ply gap defined by the respective edges of said inner ply or said outer ply, one of said inner ply and said outer ply subtending an arc greater than 360.degree. so that said core has a wall thickness of not less than two plies and not more than three plies throughout and forming an inner ply overlap or an outer ply overlap respectively, said inner ply overlap being disposed on the inner circumference of said core, said outer ply overlap being disposed on the outer circumference of said core, said inner ply overlap and said outer ply overlap being radially aligned with said outer ply gap or said inner ply gap, respectively.
A method of making a two-ply core having a generally round cross-section with an inner circumference and an outer circumference and a length defined by opposed ends, said method comprising the steps of:
- providing two plies;
- and
- winding said plies together in face to face joined relationship to form an cylindrical core having a wall throughout its length of not less than two plies, whereby said two plies comprise an inner ply and an outer ply, said inner ply and said outer ply each having a predetermined width defined by two edges and having an inner ply gap or an outer ply gap defined by the respective edges of said inner ply or said outer ply, one of said inner ply and said outer ply subtending an arc greater than 360.degree. so that said core has a wall thickness of not less than two plies and not more than three plies throughout and forming an inner ply overlap or an outer ply overlap respectively, said inner ply overlap being disposed on the inner circumference of said core, said outer ply overlap being disposed on the outer circumference of said core, said inner ply overlap and said outer ply overlap being radially aligned with said outer ply gap or said inner ply gap, respectively.
Dependencies are inferred from the claim text.