Paper Roll Reinforcing Ring for Central Hole Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Rolls of tissue paper without a mandrel face issues with central hole collapse due to internal stresses and handling pressures, leading to waste and increased production costs, especially during transport and packaging.
Innovation Solution
Incorporating a cylindrical reinforcing element with a ring secured to the innermost turn of the roll, featuring a slot for easy extraction along the axis, which supports the central hole from manufacturing to final use with minimal additional material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a mandrel is used to support the central hole during manufacturing and transport, then the central hole remains open and structurally stable, but the mandrel becomes waste material that must be removed and disposed of, increasing production costs and complexity
Solution Approach 1:
The invention extracts the mandrel from the final product by designing it to be broken into segments during the cutting process. The mandrel is intentionally designed with a structure that allows it to be separated into multiple pieces that can be easily removed and discarded, eliminating the need for complex removal procedures while reducing waste disposal costs.
Solution Approach 2:
The mandrel is designed as a segmented structure that breaks into multiple pieces during the cutting operation. This segmentation allows the mandrel to fulfill its support function during manufacturing and transport, then easily disassemble into removable segments that can be discarded without complex tools or procedures.
2Manufacturing precision
If the sheet is tightly clamped on the spindle during winding to prevent deformation, then winding precision is improved, but internal stresses increase causing central hole collapse after mandrel removal
Solution Approach 1:
The mandrel is designed with a specific structure that provides gradual support during the winding process, allowing the sheet to be clamped with sufficient precision while distributing internal stresses. The mandrel's design includes features that prevent stress concentration, cushioning the sheet against deformation during winding and subsequent handling.
3Loss of substance
If the central hole diameter is reduced to minimize material usage, then material costs decrease, but gripping and unwinding become difficult requiring multiple turns to be picked up simultaneously
Solution Approach 1:
The mandrel is designed with varying local properties - it has a smaller diameter in most sections to minimize material usage, but includes specific localized features such as enlarged sections or gripping surfaces at strategic positions. These local modifications provide easy gripping points for unwinding while maintaining minimal overall material consumption.
4Strength
If a multi-layer cardboard mandrel with glue is used to prevent central hole collapse, then structural strength is improved, but production complexity and cost increase due to additional bonding operations
Solution Approach 1:
The mandrel is designed as a disposable component made from simple, inexpensive materials with a straightforward structure. Rather than using complex multi-layer bonded constructions, the invention employs a simpler mandrel design that fulfills its temporary support function and is then discarded, reducing both production complexity and material costs.
Data Source
Figure 1~3
Figure 4~5
Figure 6~10
AI summary
The invention relates to a paper roll (10), in particular for tissue paper, that comprises a central hole along the winding axis, with a cylindrical reinforcement member on which the paper is wound, characterised in that said reinforcement member includes at least one ring (40) connected to the innermost turn of the roll (10), having a width smaller than the width of the roll, and provided with a means (42) for extracting the ring by applying a pulling force substantially along the axis of the roll.