Acryl Polyol Roller Coating for Durability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High-end laser printers require enhanced durability for developing and charging rollers due to increased toner usage, necessitating improved surface coating technologies that maintain low surface roughness, low friction, uniform electrical conductivity, high elasticity, and low hardness while extending the lifespan of these critical components.
Innovation Solution
A roller with a rotatable shaft covered by an elastic layer and a coating layer formed from a cross-linked mixture of acryl polyol and ε-caprolactone polyol, using ε-caprolactone-modified hydroxy acrylate and polycaprolactone polyols, along with a conductive agent like carbon black and a dispersing agent to ensure stability and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coating materials are used on developing and charging rollers, then initial surface properties (low roughness, low friction, uniform conductivity, high elasticity, low hardness) are achieved, but durability deteriorates under high-volume toner usage conditions
Solution Approach 1:
The patent applies composite material principles by formulating a coating layer containing multiple components: a base resin (polyester or polyurethane), a specific amount of silicone oil (0.1-10 parts by weight per 100 parts resin), and optional additives. This composite structure combines the mechanical properties of the base resin with the surface-modifying properties of silicone oil, achieving both durability and the required surface characteristics (low friction, low roughness, flexibility) that conventional single-material coatings cannot maintain over extended periods
Solution Approach 2:
The patent employs parameter change principles by precisely controlling the silicone oil content (0.1-10 parts by weight per 100 parts resin) and resin type to optimize coating performance. By adjusting these parameters, the coating achieves optimal balance between durability (resistance to toner adhesion and mechanical wear) and surface properties (flexibility, low friction, uniform conductivity), preventing degradation under high-volume usage conditions
2Strength
If the roller surface is made harder to improve durability, then wear resistance improves, but toner adhesion and electrification performance deteriorate
Solution Approach 1:
The patent applies local quality principles by creating a coating layer with differentiated properties: the base resin provides structural strength and wear resistance, while the silicone oil component localized within this structure provides surface-level flexibility, low friction, and toner interaction properties. This spatial differentiation of material functions allows the coating to simultaneously achieve wear resistance from the resin matrix and optimal toner adhesion/electrification from the silicone-modified surface
Solution Approach 2:
The composite coating structure combines hard resin components (polyester or polyurethane) for wear resistance with soft silicone oil components for surface flexibility and toner interaction. This composite approach resolves the contradiction by allowing each component to fulfill its specific function: the resin provides mechanical durability while the silicone ensures proper toner adhesion and electrification performance
3Reliability
If the roller surface is made softer to improve toner interaction, then adhesion and electrification improve, but wear resistance and structural integrity deteriorate
Solution Approach 1:
The patent applies local quality principles by concentrating the soft, flexible silicone oil component at the surface level of the coating while maintaining the harder resin structure in the bulk. This localized softness improves toner adhesion and electrification without compromising the overall structural integrity and wear resistance provided by the resin matrix
Solution Approach 2:
The composite coating combines soft silicone oil (providing flexibility and toner interaction) with hard resin (providing wear resistance). The synergistic interaction between these materials allows the coating to exhibit both soft surface properties for optimal toner interaction and hard structural properties for durability, resolving the contradiction between softness 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 solution enhances the durability and performance of the rollers by balancing hardness and conductivity, preventing toner leakage and maintaining image quality over extended use, while also improving toner adhesion and electrification, thus addressing the limitations of previous coating technologies.
Implementation Method 1
The coating layer may be a material in which a mixture containing acryl polyol and ε-caprolactone polyol is cross-linked by isocyanate
Data Source
AI summary
A roller for an image forming apparatus is provided. The roller includes a shaft rotatable on the basis of one axis, an elastic layer covering an outer circumference of the shaft, and a coating layer formed on the elastic layer. The coating layer is a material in which a mixture containing acryl polyol and ε-caprolactone polyol is cross-linked by isocyanate.