Sheet Feed Roller Friction Control via Extrusion
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Solution Overview
Problem
Conventional sheet feed rollers with thermoplastic urethane elastomer and resin beads have insufficient friction reduction, leading to potential damage to rubber counter rollers and high production costs due to injection molding processes.
Innovation Solution
A sheet feed roller composed of a thermoplastic elastomer, spherical filler, and low friction silicone compound, produced through extrusion, which reduces friction coefficient to less than 0.5 and enhances flexibility, avoiding direct contact damage and costly mold requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the proportion of resin beads is increased to reduce the friction coefficient, then the friction coefficient decreases, but the sheet feed roller becomes harder and liable to damage the rubber counter roller
Solution Approach 1:
The patent uses a composite material system consisting of thermoplastic urethane elastomer as the base matrix, resin beads as reinforcement particles, and silicone oil as a lubricating additive. This composite structure allows the resin beads to reduce friction while the elastomer matrix maintains softness and flexibility, preventing damage to the rubber counter roller despite the presence of hard particles.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the elastomer composition by controlling the particle size distribution of resin beads (specifically using beads with 40-100 μm diameter), the ratio of elastomer to resin beads, and the amount of silicone oil added. These parameter changes optimize the balance between friction reduction and softness maintenance.
2Manufacturing precision
If injection molding is used to produce the sheet feed roller, then the outer peripheral surface becomes smooth, but the resin beads are buried and fail to contribute to friction reduction, and production costs increase
Solution Approach 1:
The patent replaces the injection molding process with an extrusion process. This substitution changes the fundamental manufacturing mechanism from high-pressure injection that buries particles to a lower-pressure extrusion that allows particles to remain exposed on the surface, thereby maintaining their friction-reducing function while still producing a smooth enough surface for paper feeding.
3Manufacturing precision
If injection molding is used to produce the sheet feed roller, then the roller is formed with defined geometry, but the process requires expensive molds and batch processing, increasing production costs
Solution Approach 1:
The patent replaces the expensive injection molding process with a more economical extrusion process. Extrusion requires simpler tooling (dies instead of complex molds), allows for continuous production rather than batch processing, and reduces tooling costs significantly while still producing rollers with the required geometric precision and surface quality.
4Strength
If the sheet feed roller is made softer to avoid damaging the counter roller, then the flexibility increases, but the friction coefficient increases and the roller cannot effectively bias the paper sheet
Solution Approach 1:
The patent creates a composite material where soft thermoplastic urethane elastomer provides the necessary flexibility and cushioning to protect the rubber counter roller, while dispersed resin beads within the matrix provide friction reduction. The silicone oil further lubricates the surface, enabling the soft roller to achieve the required friction coefficient of 0.5 or less without compromising its softness.
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 solution achieves a lower friction coefficient and improved flexibility, preventing paper wrinkling and counter roller damage while reducing production costs through a continuous extrusion process.
Implementation Method 1
an elastomer composition containing a thermoplastic elastomer, a spherical filler and a low friction silicone compound, and has a friction coefficient of not greater than 0.5
Implementation Method 2
a method of producing a sheet feed roller, the method including the step of extruding an elastomer composition through a die configured as corresponding to a sectional shape of the sheet feed roller
Data Source
AI summary
A sheet feed roller (1) is provided, which is formed of an elastomer composition containing a thermoplastic elastomer, a spherical filler and a low friction silicone compound, and has a friction coefficient of not greater than 0.5. A production method is also provided, which includes the step of extruding the elastomer composition through a die configured as corresponding to a sectional shape of the sheet feed roller.