Developing Roller Resin Layer for Residual Potential Control
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Solution Overview
Problem
Conventional developing rollers with silane coupling agent layers experience residual potential issues during repetitive use, leading to toner leakage, contamination, and image unevenness due to toner electrification.
Innovation Solution
A developing roller with a conductive shaft and a resin layer containing a silicone copolymer resin as the surface layer and a polyamide resin as the underlying layer, which enhances charge leakage and insulation, preventing adhesion and improving durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an intermediate layer with silane coupling agent is used to improve adhesion between resin layer and rubber layer, then interlayer adhesiveness is improved, but residual potential rises during repetitive use
Solution Approach 1:
The invention removes the silane coupling agent intermediate layer that causes residual potential issues while maintaining adhesion through direct bonding between the resin layer and rubber layer. The resin layer is formulated with enhanced adhesive properties that eliminate the need for the problematic intermediate layer.
Solution Approach 2:
The invention uses a composite resin layer containing specific polymers (polyester resin, polyurethane resin, and acrylic resin) with controlled glass transition temperatures and adhesive characteristics. This composite formulation provides both strong adhesion to the rubber layer and prevents residual potential buildup during repetitive use.
2Duration of action of stationary object
If strong adhesion is provided between resin layer and rubber layer to prevent peeling under large load, then durability is improved, but residual potential rises during repetitive use
Solution Approach 1:
The invention removes the silane coupling agent intermediate layer that compromises reliability during repetitive use, while maintaining durability through direct adhesion between the resin layer and rubber layer. The resin layer is specifically formulated to provide both durability and residual potential control.
Solution Approach 2:
The invention changes the chemical and physical parameters of the resin layer by selecting specific polymers with controlled glass transition temperatures (Tg) and adhesive properties. This parameter optimization ensures the resin layer maintains strong adhesion for durability while preventing residual potential buildup for reliability.
3Ease of operation
If a resin layer is formed on the developing roller surface for toner conveyance and charging, then toner electrification is enabled, but adhesion matter on the surface causes toner leakage and contamination
Solution Approach 1:
The invention optimizes the surface properties of the resin layer by controlling the glass transition temperature and adhesive characteristics of the polymer components. This parameter control enables proper toner electrification while preventing adhesion matter buildup that causes leakage and contamination.
Solution Approach 2:
The resin layer is formulated with specific local properties: the polymer composition and Tg are controlled to provide appropriate adhesion for toner electrification in the contact region, while surface characteristics prevent excessive adhesion that would cause toner leakage and contamination.
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 effectively suppresses residual potential, maintains interlayer adhesiveness, prevents toner leakage, and ensures stable image formation by facilitating even toner electrification, achieving improved durability and image quality during repetitive use.
Implementation Method 1
the resin layer possesses a surface layer containing a silicone copolymer resin as a principal component and a layer containing a polyamide resin as a principal component that is provided immediately below the surface layer
Implementation Method 2
charging is conducted by rubbing and pressing the toner with a charging member or the surface of a developing roller
Implementation Method 3
a technique by which adhesion or fusion of the toner onto the developing roller surface is prevented has been investigated
Data Source
AI summary
An objective is to provide a developing roller possessing a surface layer capable of suppressing the residual potential during repetitive use with no damage of interlayer adhesiveness, preventing toner leakage and contaminations caused by adhesion matter on the surface, and preventing developing unevenness because of even toner electrification; and also to provide an image forming method employing the developing roller. Also disclose is a developing roller possessing a conductive shaft, and a resin layer provided around an outer circumferential surface of the conductive shaft, wherein the resin layer possesses a surface layer containing a silicone copolymer resin as a principal component and a layer containing a polyamide resin as a principal component, that is provided immediately below the surface layer.