Toner Set Internal Friction Angle Control for Color Reproducibility
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Solution Overview
Problem
Existing toner sets for electrostatic image development struggle to produce full-color images with superior gradation and color reproducibility, especially in higher-order colors, and face challenges with continuous printing durability, particularly in low-temperature and low-humidity environments.
Innovation Solution
A toner set comprising a combination of yellow, cyan, and magenta toners, each containing colored resin particles with specific internal friction angles and external additives, where the first toner has a lower internal friction angle than the second toners, ensuring optimal flowability and adhesion for improved image quality and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If toners with uniform particle size distribution are used, then image density is improved, but gradation quality of higher-order colors deteriorates
Solution Approach 1:
The toner population is segmented into multiple particle size groups (first, second, and third particle size groups with different average diameters) rather than using uniform particles. Each group contributes differently to image formation, with smaller particles providing density and larger particles providing gradation quality, especially for higher-order colors.
Solution Approach 2:
Different particle size groups are assigned different functional roles: smaller particles (first group) primarily contribute to image density, while larger particles (third group) primarily contribute to gradation quality. This local differentiation of particle functions resolves the contradiction between density and gradation.
2Ease of operation
If toners with high flowability are used, then transfer efficiency is improved, but adhesion to transfer medium deteriorates
Solution Approach 1:
The toner is segmented into multiple particle size groups with different flowability characteristics. Smaller particles provide better flowability for transfer, while larger particles provide better adhesion to the transfer medium, resolving the contradiction between these two properties.
Solution Approach 2:
The toner forms a composite structure with particles of different sizes working together: smaller particles facilitate flow and transfer efficiency, while larger particles enhance adhesion to the transfer medium. This composite approach allows both properties to coexist.
3Device complexity
If single-component developer is used, then device complexity is reduced, but image quality in low-temperature environments deteriorates
Solution Approach 1:
The invention changes the physical parameters of the single-component developer, specifically the particle size distribution and internal friction angle, to enable high-quality image formation in low-temperature environments without requiring complex multi-component systems. The controlled particle size distribution allows the single-component developer to maintain both simplicity and performance.
4Manufacturing precision
If toners with small particle size are used, then image resolution is improved, but transfer efficiency deteriorates
Solution Approach 1:
The toner is segmented into multiple particle size groups where smaller particles (first group) provide high image resolution and larger particles (third group) provide good transfer efficiency. The combination allows both resolution and transfer efficiency to be maintained simultaneously.
Solution Approach 2:
The multi-component toner structure acts as a composite material where particles of different sizes complement each other: smaller particles ensure high resolution while larger particles ensure efficient transfer, resolving the contradiction between these two performance aspects.
Data Source
AI summary
A toner set and an image forming method, both of which can print a full-color image that is superior in gradation and color reproducibility of an image including a higher-order color and superior in continuous printing durability. When one color toner selected from the group consisting of the color toners included in the toner set is defined as a first toner and other color toners are defined as second toners, an internal friction angle θ1 (°) of the first toner and an internal friction angle θ2 (°) of each of the second toners satisfy relationships represented by the following formulae (1) and (2), and a first image developed with the first toner and second images developed with the second toners are transferred in this order on a recording medium or a transfer medium to form an image including a higher-order color:θ1<θ2 Formula (1):1°≤θ2−θ1≤3°. Formula (2):