Irregular Inorganic Particles in Electrostatic Toner for Offset Prevention
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Solution Overview
Problem
Existing electrostatic image developing toners experience offset issues when fixing images to recording media, particularly in high-density image formation and high humidity environments, due to the inadequate separation of layered compound particles from toner particles, leading to insufficient fixing pressure.
Innovation Solution
The development of an electrostatic image developing toner comprising toner particles, layered compound particles, and inorganic particles, where the proportion of irregular-shaped inorganic particles is adjusted between 2% to 70% by number, with circularity between 0.5 and 0.9 and size between 0.015 μm and 0.350 μm, to maintain efficient friction force for effective image fixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional toner formulations with layered compound particles and inorganic particles are used, then image fixing is achieved, but image offset occurs due to insufficient friction force and inadequate separation of particles
Solution Approach 1:
The patent applies parameter changes by precisely controlling the proportion of irregular-shaped inorganic particles (2-70% by number), their circularity (0.5-0.9), and size (0.015-0.350 μm). These parameter optimizations ensure the inorganic particles provide sufficient friction force while maintaining proper separation from toner particles, preventing image offset during fixing without compromising fixation quality
Solution Approach 2:
The patent uses composite materials by combining toner particles, layered compound particles, and specifically formulated irregular-shaped inorganic particles into a multi-component toner system. This composite structure leverages the complementary properties of each component: toner particles for image formation, layered compound particles for lubrication, and irregular-shaped inorganic particles for friction control, achieving both effective fixing and offset prevention
2Stability of the object's composition
If the proportion of irregular-shaped inorganic particles is optimized, then friction force consistency is improved, but particle separation becomes more difficult to control
Solution Approach 1:
The patent resolves this contradiction through parameter changes by establishing specific ranges for inorganic particle proportion (2-70% by number), circularity (0.5-0.9), and size (0.015-0.350 μm). These controlled parameters ensure that irregular-shaped inorganic particles provide consistent friction force while maintaining manufacturable separation characteristics, balancing stability and precision requirements
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
This toner formulation reduces the likelihood of image offset by ensuring consistent friction force between the fixing unit and the toner image, preventing adhesion to the fixing unit and enhancing image fixation on the recording medium.
Implementation Method 1
maintain efficient friction force for effective image fixing
Data Source
AI summary
An electrostatic image developing toner includes toner particles, layered compound particles, and inorganic particles. The proportion of irregular-shaped inorganic particles having a circularity of 0.5 or more and 0.9 or less and a size of 0.015 μm or more and 0.350 μm or less to the entire inorganic particles is 2% by number or more and 70% by number or less.