Silane Cross-linked Carrier Resin Layer for Hot Offset Prevention
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Solution Overview
Problem
In full-color electrophotographic image formation, the occurrence of hot offset and carrier deposition leads to image quality issues such as adhesion of toner particles to the carrier, reduced transfer rates, and image contamination, due to the lower viscoelasticity of toners and smaller particle sizes, which complicates the control of carrier resistance and magnetization.
Innovation Solution
A novel carrier with a magnetic core particle and a resin layer comprising a conductive particle and a copolymer with specific monomer units, providing a low-surface-energy silane-based cross-linked layer that is resistant to abrasion and toner adherence, while maintaining proper resistivity and developer feed rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If toners are designed to express lower viscoelasticity when melted to achieve smooth surface and high gloss, then image quality is improved, but hot offset occurs more frequently
Solution Approach 1:
A release agent is introduced as an intermediary substance between the toner and the fixing roller/belt. This release agent modifies the interaction interface, allowing the toner to have low viscoelasticity for smooth surfaces while preventing adhesion to the fixing member, thus resolving the hot offset issue
Solution Approach 2:
The viscoelasticity parameter of the toner is specifically adjusted to a lower range when melted, and the release agent content is optimized to balance surface smoothness and anti-adhesion properties, enabling smooth high-gloss images without excessive hot offset
2Object-affected harmful factors
If toners include a release agent to prevent hot offset, then hot offset is reduced, but transfer rate decreases due to high adhesive property
Solution Approach 1:
The release agent content is precisely controlled within an optimized range, and the viscoelasticity of the toner is adjusted to achieve a balance where sufficient release properties prevent hot offset while maintaining adequate adhesion for high transfer rates
3Manufacturing precision
If carrier particles are reduced in size to improve image quality, then resolution is improved, but carrier deposition occurs more frequently
Solution Approach 1:
The carrier particle size is reduced to a specific range that provides sufficient resolution while minimizing deposition, and the magnetic properties (magnetization and electric resistance) are optimized to control carrier behavior and prevent deposition on the photoreceptor
4Manufacturing precision
If toner particles are reduced in size to improve image quality, then resolution is improved, but toner scattering and background fouling occur due to reduced charge
Solution Approach 1:
The toner particle size is reduced to improve resolution, while the release agent content and viscoelasticity are optimized to maintain sufficient charge and prevent scattering and background fouling
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 prevents carrier deposition, ensures high-quality images with consistent image density and reduced toner scattering, and extends the lifespan of the carrier by enhancing its durability and environmental stability.
Implementation Method 1
there have been various attempts to provide a low-surface-energy covering layer, comprised of a fluorine-based resin, a silicone resin, or the like, on a core material of carrier
Implementation Method 2
controlling charge polarity and quantity
Implementation Method 3
an electrostatic latent image is formed on an image bearing member comprising a photoconductive material, and the electrostatic latent image is developed into a toner image with a charged toner
Data Source
AI summary
A carrier comprising a magnetic core particle having a shape factor SF-2 of 130 to 160 and a resin layer covering a surface of the magnetic core particle. The resin layer comprises a conductive particle and a resin obtained by heating a copolymer comprising a silicon-containing A unit and another silicon-containing B unit.