Developer Toner Particle Size Control for Image Quality
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Solution Overview
Problem
Conventional image forming apparatuses with toner particles smaller than 8 μm experience a decline in image quality, necessitating a developer solution that improves particle size and stability to enhance image formation.
Innovation Solution
The developer includes toner with a volume average particle size between 3.9 μm and 6.1 μm, coated with an additive agent, and contains agglomerates with a volume average particle size between 75 μm and 100 μm in an amount of 0.01 wt % to 0.10 wt %, which are retained in a developer storage unit to prevent deterioration and improve image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the toner particle size is reduced to improve image resolution, then the image quality deteriorates due to developer instability
Solution Approach 1:
The patent applies parameter changes by precisely controlling the toner particle size within the range of 3.9 μm to 6.1 μm and the agglomerate content within 0.01 wt% to 0.10 wt%. This optimization of physical parameters resolves the contradiction by finding the optimal balance point where small enough particles provide high resolution while the controlled agglomerate content maintains developer stability and prevents deterioration.
Solution Approach 2:
The patent uses composite materials by combining toner particles with specifically sized agglomerates in defined proportions. The composite structure of fine toner particles (3.9-6.1 μm) combined with controlled agglomerates (0.01-0.10 wt%) creates a synergistic effect where the agglomerates stabilize the developer while the fine particles enable high-resolution imaging.
2Manufacturing precision
If the toner particle size is reduced below 8 μm, then the image quality improves in terms of fineness, but the image quality deteriorates due to increased fog and uneven density
Solution Approach 1:
The patent resolves this contradiction through parameter optimization by setting the toner particle size within 3.9 μm to 6.1 μm and controlling agglomerate content at 0.01 wt% to 0.10 wt%. This precise parameter control ensures particles are fine enough for high-quality imaging while the controlled agglomerates prevent fog and uneven density by maintaining proper developer flow and distribution.
Solution Approach 2:
The agglomerates act as an intermediary substance that mediates between the fine toner particles and the developer carrier. These controlled agglomerates (0.01-0.10 wt%) prevent direct aggregation of fine particles, thereby reducing fog and uneven density while preserving the fine particle size needed for high image quality.
3Manufacturing precision
If conventional toner formulations are used with particles less than 8 μm, then the particle size is suitable for high resolution, but the developer deteriorates rapidly
Solution Approach 1:
The patent applies parameter changes by optimizing both the toner particle size (3.9-6.1 μm) and the agglomerate content (0.01-0.10 wt%). This dual parameter optimization extends developer shelf life while maintaining the fine particle size needed for high-resolution imaging, resolving the contradiction between particle size control and developer stability.
Solution Approach 2:
The patent applies preliminary action by pre-forming controlled agglomerates and incorporating them into the developer formulation before use. This preliminary preparation of agglomerates (0.01-0.10 wt%) prevents subsequent deterioration and maintains particle size stability throughout the developer's service life, extending its effective duration.
Data Source
AI summary
Developer includes toner formed of base particles containing at least a binder resin. The base particles have surfaces coated with an additive agent, and the toner has a volume average particle size between 3.9 μm and 6.1 μm. The developer further includes agglomerates in an amount between 0.01 wt % and 0.10 wt %. The agglomerates have a volume average particle size between 75 μm and 100 μm.