Toner Set Surface Release Agent Distribution for Charge Stability
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Solution Overview
Problem
In electrophotography, the uneven distribution of oil-treated inorganic particles between black and color toners leads to charge potential fluctuations, causing paper wrinkles during image fixation due to differences in the amount of oil released, especially in varying environmental conditions.
Innovation Solution
An electrostatic charge image developing toner set is formulated with black and color toners, where the proportion of the release agent exposed on the surface of the color toner particles is greater than that of the black toner particles, ensuring consistent charge retention and reduced oil release variability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the proportion of release agent exposed on the surface of black toner particles is increased to match color toner particles, then charge potential stability is improved, but oil release consistency deteriorates due to excessive oil release from black toner
Solution Approach 1:
The patent applies local quality by creating different surface compositions for black and color toner particles. Specifically, the black toner particles have a surface layer with lower release agent content compared to color toner particles. This localized differentiation allows each toner type to have optimized properties: color toner particles have sufficient release agent exposure for charge stability, while black toner particles have controlled release agent exposure to prevent excessive oil release, thereby resolving the contradiction between charge potential stability and oil release consistency.
2Reliability
If the release agent proportion on color toner particles is increased to ensure charge retention, then charge potential stability is improved, but paper wrinkles are generated due to excessive oil release
Solution Approach 1:
The patent implements local quality by establishing distinct surface characteristics for different toner types. Color toner particles are designed with a surface layer containing a specific proportion of release agent that ensures adequate charge retention, while black toner particles are designed with a surface layer having lower release agent content. This localized differentiation prevents the excessive oil release from black toner that would otherwise cause paper wrinkles during the fixing process, while still maintaining sufficient charge retention in color toner particles.
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 configuration prevents the generation of paper wrinkles by maintaining consistent oil supply to the fixing member, enhancing image quality and reliability across different environmental conditions.
Implementation Method 1
an electrostatic charge image developing black toner that includes black toner particles including a black colorant, a binder resin, and a release agent
Data Source
AI summary
An electrostatic charge image developing toner set includes an electrostatic charge image developing black toner that includes black toner particles including a black colorant, a binder resin, and a release agent, and inorganic particles containing an oil; and an electrostatic charge image developing color toner that includes color toner particles including a color colorant, a binder resin, and a release agent, and inorganic particles containing an oil, wherein a proportion of the release agent exposed to a surface of the color toner particles is greater than a proportion of the release agent exposed to a surface of the black toner particles.