Winding Core Energy-Absorbing Zone for Roll Strain Reduction
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Solution Overview
Problem
Conventional winding cores collapse abruptly and are insufficient in absorbing roll strain energy, leading to excessive inside diameter reduction (ID comedown) and vibration issues, especially when handling materials like plastic films wound under tension.
Innovation Solution
A winding core design featuring a cylindrical structure with a radially inner shell, an outer shell, and an energy-absorbing zone formed by collapsible layers with three-dimensional structured atomic regions that absorb and distribute pressure, allowing controlled collapse over time to reduce ID comedown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional corrugated paperboard layers are used in a winding core, then the core can immediately relieve some radially inward compression during winding, but the radially compressible region collapses too abruptly and in an uncontrolled fashion, leading to high vibration of the rapidly rotating core
Solution Approach 1:
The patent changes the geometric parameters of the compressible region from conventional corrugated structures to a specific multi-layer configuration with controlled thickness ratios. The inner and outer layers have thicknesses t1 and t2 respectively, where t1/t2 is controlled to achieve progressive collapse. This parameter optimization allows the compressible region to deform in a controlled manner rather than collapsing abruptly, thereby reducing core vibration while maintaining compression relief capability
Solution Approach 2:
The patent employs a composite multi-layer structure consisting of inner compressible layers, intermediate layers, and outer layers with different mechanical properties. This composite construction combines materials and structures with varying stiffness and compressibility characteristics, enabling the core to progressively absorb radially inward compression through staged deformation of different layers, thus achieving controlled collapse and reduced vibration
2Force
If the radially compressible region is designed to collapse easily to relieve compression, then some inward pressure is absorbed, but the capacity is insufficient to significantly reduce ID comedown under large pressure from plastic films wound under significant tension
Solution Approach 1:
The patent divides the radially compressible region into multiple discrete layers (inner layers, intermediate layers, and outer layers) that can deform independently in sequence. This segmentation allows the compressible region to progressively absorb large inward pressure through staged collapse of individual layers, significantly increasing the total energy absorption capacity compared to a single-layer structure, thereby effectively reducing ID comedown under high tension winding conditions
Solution Approach 2:
The patent designs the compressible region to dynamically adapt its stiffness characteristics during the winding process. As layers progressively collapse under increasing radial pressure, the structure transitions from a stiffer initial state to a more compliant final state. This dynamic behavior allows the core to accommodate both the immediate winding pressure and the prolonged post-winding shrinkage forces, significantly reducing ID comedown while maintaining structural integrity
3Reliability
If the core is designed with sufficient radial thickness reduction capacity to absorb large pressure, then ID comedown is reduced, but the core structure becomes more complex and requires more material
Solution Approach 1:
The patent optimizes the thickness parameters of individual layers within the compressible region to achieve the desired energy absorption capacity without excessive material usage. By carefully controlling the thickness ratios (t1/t2) and total thickness of the multi-layer structure, the core achieves sufficient radial collapse capability to reduce ID comedown while maintaining a relatively simple and material-efficient design compared to solid-wall cores
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design significantly reduces ID comedown and length growth, improving core stability and material efficiency by absorbing roll strain energy both during and after winding, while maintaining core integrity and reducing material usage.
Implementation Method 1
the roll of wound material stores energy referred to herein as 'roll strain energy' because of the tension under which the film is wound around the core and/or because of the shrinkage of the material after winding
Data Source
AI summary
Winding cores for elastically stretched or shrinkable materials are designed to significantly reduce the amount of roll strain energy developed during winding. This is accomplished by building into the core an energy-absorbing zone that can be collapsed by a substantial amount and in a relatively controlled fashion over a substantial period of time under the influence of a continued radially inward pressure exerted by the roll of wound material. The energy-absorbing zone is formed by one or more collapsible layers having repeated atomic regions projecting out of a plane of the sheet and each defining a plurality of normal vectors in different sub-regions of the atomic region, wherein the normal vectors, when projected onto the two-dimensional plane of the sheet, are in a plurality of different directions in the plane.