Toner Set Cation Control for Streak Suppression
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Solution Overview
Problem
Toner sets used for continuous printing at high temperatures and high humidity often result in streaks due to charge distribution issues and adhesion problems, particularly with white toner images, which are exacerbated by the hardness and high specific gravity of white toner particles and their interaction with discharge products on intermediate transfer members.
Innovation Solution
A toner set is developed with specific conditions for the amounts of cations on the surface of white and color toners, where the amount of cations on the white toner is smaller than on the color toner, controlling moisture interaction and adhesion, and incorporating zinc stearate particles to manage particle size and aggregation, thereby reducing streaks by optimizing the interaction with discharge products and blade cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If white toner is used for continuous printing at high temperature and high humidity, then image formation is achieved, but streaks occur due to charge distribution issues and adhesion problems
Solution Approach 1:
The patent applies parameter changes by precisely controlling the cation content on toner surfaces (Cw for white toner and Cc for color toner) to satisfy specific mathematical relationships. By adjusting these chemical parameters, the toner's interaction with moisture and discharge products is optimized, preventing streak formation while maintaining reliable image formation under high temperature and humidity conditions
Solution Approach 2:
The patent uses cations on the toner surface as intermediaries to mediate the interaction between toner particles and the environment (moisture, discharge products). By controlling the amount and distribution of these cations, the toner's adhesion properties and charge distribution are optimized, acting as a buffer that prevents direct harmful interactions that cause streaks
2Manufacturing precision
If white toner particles with high hardness and high specific gravity are used, then image formation is achieved, but adhesion problems and interaction with discharge products worsen
Solution Approach 1:
The patent changes the chemical composition parameters of the white toner by controlling the cation content (Cw) and its relationship to color toner cation content (Cc). This chemical modification addresses the adhesion problems inherent in hard, high-specific-gravity white toner particles without compromising image formation quality
3Productivity
If continuous printing is performed at high temperature and high humidity, then productivity is improved, but streaks and blade chipping increase
Solution Approach 1:
The patent modifies the chemical parameters of the toner (cation content ratios) to enable continuous printing under harsh environmental conditions without the harmful effects of streaks and blade chipping that normally accompany high-productivity printing operations
Solution Approach 2:
The patent converts the potentially harmful interaction between white toner and discharge products into a beneficial effect by controlling cation content. The controlled cation distribution allows the toner to interact with discharge products in a way that prevents streak formation, turning what would be a harmful interaction into a mechanism that maintains image quality during continuous high-speed printing
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 set effectively suppresses streaks in images by controlling cation amounts and moisture interaction, ensuring better adhesion and removal of toner particles, reducing blade chipping and improving image quality during continuous printing at high temperatures and humidity.
Implementation Method 1
in a case where Cw [mg/L] represents an amount of a cation on a surface of the white toner, measured by ion chromatography, and Cc [mg/L] represents an amount of a cation on a surface of the color toner, measured by ion chromatography
Data Source
AI summary
A toner set has a white toner and a color toner, in which in a case where Cw [mg/L] represents an amount of a cation on a surface of the white toner, measured by ion chromatography, and Cc [mg/L] represents an amount of a cation on a surface of the color toner, measured by ion chromatography, the toner set satisfies Conditions (1) and (2).0.3 mg/L≤Cc≤1.2 mg/L (1)(Cw/Cc)≤0.8 (2)