Composite Toner Additives Prevent Cleaning Blade Slippage
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Solution Overview
Problem
In electrophotographic image-forming processes, toners with lubricant particles can cause slippage and contamination during cartridge restart, leading to image defects like startup streaks and vertical streaks due to wear and friction issues with the cleaning blade, especially when using hard silica particles.
Innovation Solution
A toner formulation incorporating composite particles of organosilicon polymer fine particles and fatty acid metal salts, which form a dense and flexible blocking layer at the cleaning blade nip, preventing slippage and maintaining cleaning performance without damaging the latent image bearing member surface over long-term use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lubricant particles are added to reduce friction between the latent image bearing member and cleaning blade, then cleaning performance is improved, but slippage and contamination occur during cartridge restart causing startup streaks
Solution Approach 1:
The invention uses composite particles comprising a fatty acid metal salt core and an organosilicon polymer coating. This composite structure combines the lubricating properties of the fatty acid metal salt with the adhesion and flexibility of the organosilicon polymer, achieving both good cleaning performance and prevention of startup streaks by preventing particle slippage while maintaining surface integrity
Solution Approach 2:
The invention changes the physical and chemical parameters of the lubricant particles by coating fatty acid metal salts with organosilicon polymer. This modification alters the particle surface properties, enabling them to adhere to the cleaning blade and form a flexible blocking layer that prevents slippage during cartridge restart while maintaining lubricating function
2Reliability
If hard silica particles are used as lubricant, then friction is reduced, but the cleaning blade scratches the latent image bearing member surface causing vertical streaks
Solution Approach 1:
The invention changes the hardness parameter of the lubricant particles by replacing hard silica with softer fatty acid metal salt cores coated with organosilicon polymer. This parameter change maintains the lubricating function while eliminating the scratching effect on the latent image bearing member surface
Solution Approach 2:
The composite structure of soft fatty acid metal salt core with organosilicon polymer coating provides both lubrication and surface protection. The soft core reduces friction without damaging the drum surface, while the polymer coating enhances adhesion and flexibility
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 toner effectively prevents slippage and contamination of external additives during cartridge restart, maintaining good cleaning performance and avoiding image defects such as startup and vertical streaks, while ensuring the surface integrity of the latent image bearing member.
Implementation Method 1
composite particles of an organosilicon polymer fine particle and a fatty acid metal salt... form a dense and flexible blocking layer at the cleaning blade nip, preventing slippage
Implementation Method 2
because friction occurs between the cleaning blade and the surface of the latent image bearing member, the cleaning performance may decline due to wear
Data Source
AI summary
A toner including a toner particle containing a binder resin and an external additive, wherein the external additive contains composite particles of an organosilicon polymer fine particle and a fatty acid metal salt.