Winding Core High Friction Coating Chuck Slippage
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Solution Overview
Problem
Current winding cores experience excessive slippage when engaged with chucks, leading to core damage, reduced throughput, and increased material waste due to inadequate torque transmission and engagement.
Innovation Solution
The implementation of a high COF coating applied to the inner surface of the core, specifically designed to increase the coefficient of friction between the core and the core engaging elements, thereby enhancing torque transmission and preventing slippage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If smooth expanding elements are used in chucks, then the chuck structure is simple and easy to manufacture, but the torque transmission is insufficient and slippage occurs
Solution Approach 1:
The core engaging surface is differentiated from the core body by applying a softer material specifically at the chuck engagement area. This local quality change allows the chuck to penetrate and grip the softer surface while the rest of the core maintains its structural integrity and smooth appearance.
Solution Approach 2:
The core is constructed as a composite structure combining a rigid core body material with a softer engaging surface material. This composite approach enables the core to have both structural strength and improved chuck engagement properties simultaneously.
2Reliability
If the chuck engages firmly to prevent slippage, then torque transmission is improved, but the core ends are damaged or destroyed
Solution Approach 1:
The softer material is applied only to the engaging surface where the chuck contacts the core, while the core ends maintain their original strength. This localized application allows firm engagement without compromising the overall structural integrity of the core ends.
Solution Approach 2:
The softer engaging surface acts as a sacrificial layer that can wear or deform under high torque conditions, protecting the main core structure from damage. This sacrificial layer absorbs the mechanical stress of engagement while preserving the core ends for continued use.
3Productivity
If higher web speeds and roll weights are used to increase productivity, then throughput is improved, but the stability of winding cores is compromised due to excessive torque demands
Solution Approach 1:
The coefficient of friction parameter is changed by applying a softer material to the engaging surface. This parameter change increases the maximum torque transmission capacity, allowing the core to handle higher web speeds and weights without slippage, thereby maintaining stability under increased productivity demands.
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 high COF coating significantly increases the maximum torque that can be applied to the core without slippage, reducing core damage and improving the overall efficiency and reliability of the winding process.
Implementation Method 1
a high COF coating applied to the inner surface of the core, specifically designed to increase the coefficient of friction between the core and the core engaging elements, thereby enhancing torque transmission and preventing slippage
Data Source
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AI summary
An improved core (10) for mounting on one or more core engaging elements such as a pair of chucks (52) and a method of making an improved core (10) are provided. The core (10) is adapted to wind and unwind material thereon. The core (10) comprises a high coefficient of friction coating (70) disposed on the inner surface (12) of the core (10) to improve core-chuck interaction.