Double-Layer Sheet Conveying Roller Hardness Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional sheet conveying rollers with a single-layer structure experience reduced friction coefficient and sheet conveying failures due to slip-rotation issues when using a urethane thermoplastic elastomer outer layer, which lacks sufficient adhesiveness and stretchability, leading to premature wear and squeal.
Innovation Solution
A double-layer structure sheet conveying roller with a tubular outer layer made of urethane thermoplastic elastomer and a tubular inner layer of crosslinking product of butyl rubber or ethylene propylene rubber, where the outer layer has a Type-A Durometer hardness of 40-65 and the inner layer has a hardness of 10-25, preventing slip-rotation and maintaining friction coefficient balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the outer layer is made of urethane thermoplastic elastomer for ease of manufacture and recyclability, then the roller body becomes easier to manufacture and recycle, but the outer layer has lower stretchability and adhesiveness to the inner layer, causing slip-rotation
Solution Approach 1:
The patent changes the hardness parameter of the outer layer to a specific range (30-65 on the JIS A scale) to optimize both the thermoplastic elastomer's manufacturability and its stretchability for preventing slip-rotation. This parameter optimization resolves the contradiction between ease of manufacture and reliability.
Solution Approach 2:
The patent uses a composite structure with an inner layer (hardness 5-25) and outer layer (hardness 30-65) made of different rubber materials. This composite material approach allows the inner layer to provide adhesion while the outer thermoplastic elastomer layer provides ease of manufacture and recyclability, resolving the contradiction between manufacturability and reliability.
2Area of stationary object
If the inner layer hardness is reduced to not greater than 10 to provide sufficient contact area, then the contact area between roller and sheet is sufficient, but oil bleeding occurs and adhesiveness to outer layer is reduced
Solution Approach 1:
The patent optimizes the inner layer hardness to a specific range (5-25 on JIS A scale) that balances two requirements: soft enough to deform and provide sufficient contact area with the sheet, but hard enough to minimize oil bleeding and maintain adhesiveness to the outer layer. This parameter optimization resolves the contradiction between contact area and reliability.
3Object-generated harmful factors
If the outer layer hardness is reduced to improve friction coefficient with sheet, then the friction coefficient increases, but the outer layer becomes too soft and loses abrasion resistance
Solution Approach 1:
The patent optimizes the outer layer hardness to a specific range (30-65 on JIS A scale) that balances friction performance and durability. This parameter optimization ensures the outer layer is soft enough to provide adequate friction with the sheet but hard enough to maintain abrasion resistance, resolving the contradiction between friction coefficient and strength.
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 double-layer structure ensures continuous prevention of sheet conveying failure and squeal, reduces oil bleeding, and enhances abrasion resistance, maintaining performance over the roller's lifespan.
Implementation Method 1
the inner layer, which is a softer layer as described above, permits deformation of the outer layer to provide a sufficient contact area between the outer peripheral surface of the roller body and a sheet
Implementation Method 2
adapted to be rotated in frictional contact with a sheet... to convey the sheet
Implementation Method 3
IIR is excellent in vibration damping property. This prevents the sheet conveying failure and the squeal for a longer period of time
Data Source
AI summary
The inventive sheet conveying roller has a double-layer structure including a tubular outer layer and an inner layer inserted directly in the tubular outer layer without the intervention of an adhesive agent. The sheet conveying roller includes a roller body of a double-layer structure including a tubular outer layer (6) of a urethane thermoplastic elastomer and an inner layer (7) of a rubber such as IIR inserted directly in the tubular outer layer (6) without the intervention of an adhesive agent. The outer layer (6) has a Type-A Durometer hardness of not less than 40 and not greater than 65, and the inner layer (7) has a Type-A Durometer hardness of greater than 10 and not greater than 25.