Fibrous Core Manufacturing with Overlapping Strip Edges
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Solution Overview
Problem
There is a need for fibrous cores for rolled products that offer reduced cost while maintaining sufficient strength properties, optimized for cost and strength, and capable of displaying branding or indicia for consumer awareness, which existing cores fail to provide effectively.
Innovation Solution
A method for manufacturing fibrous cores using a strip with a liner and a fluted layer, wound onto a mandrel at a specific angle, where the leading edge overlaps the trailing edge to form a core with a reduced basis weight while maintaining axial and radial strength, and incorporating indicia for branding purposes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If wall thickness is increased to improve core strength, then radial and axial strength are improved, but manufacturing cost increases
Solution Approach 1:
The core is constructed as a composite structure combining a fluted layer (providing radial strength) and a liner layer (providing axial strength). This composite approach allows each layer to be optimized for its specific function, achieving high overall strength without requiring uniformly thick walls throughout the entire core structure.
Solution Approach 2:
Different regions of the core have different wall thicknesses optimized for their specific functions: the fluted layer has greater thickness to provide radial strength, while the liner layer provides axial strength. This non-uniform thickness distribution achieves high strength with reduced overall material usage compared to uniform thick walls.
2Strength
If fluted layer thickness is increased to improve radial strength, then core can resist collapse under side-to-side pressure, but manufacturing cost increases
Solution Approach 1:
The fluted layer is combined with a liner layer in a composite structure. The fluted layer's thickness can be optimized specifically for radial strength requirements, while the liner layer compensates for any strength deficiencies and provides axial support, allowing cost-effective manufacturing by distributing the strength requirements across two specialized layers.
3Strength
If liner layer thickness is increased to improve axial strength, then core provides crush-resistance during storage and shipping, but manufacturing cost increases
Solution Approach 1:
The liner layer is combined with a fluted layer in a composite structure. The liner layer's thickness can be optimized specifically for axial strength requirements, while the fluted layer compensates for any strength deficiencies and provides radial support, allowing cost-effective manufacturing by distributing the strength requirements across two specialized layers.
4Strength
If higher density paper or paperboard is used to improve strength, then paper strength is improved, but material cost increases
Solution Approach 1:
The core uses a composite structure combining a fluted layer and a liner layer, where each layer can be manufactured from paper or paperboard at optimal densities for its specific function. This allows the use of lower-density, lower-cost materials in each layer rather than requiring high-density material throughout, reducing overall material cost while maintaining strength.
Data Source
AI summary
The present disclosure is directed to a method for manufacturing a fibrous core comprises: providing a strip comprising at least one liner, and at least one fluted layer, wherein the strip has a leading edge, a trailing edge, a first strip face, a second strip face, and a strip axis substantially parallel to at least one of the leading edge and the trailing edge; feeding the strip to a mandrel having a central longitudinal axis extending in a longitudinal direction; winding the strip onto the mandrel such that the leading edge of the strip overlaps the trailing edge of the strip to form a fibrous core comprising an inner surface, an outer surface, and a longitudinal core axis; and adhering the leading edge to the trailing edge of the strip to from an overlap portion having an overlap width.