Toner Particle Size Control for Aggregation Prevention
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Solution Overview
Problem
Electrostatic charge image development toners tend to aggregate in replenishment toner containers when the environment changes from high-temperature and high-humidity to low-temperature and low-humidity, leading to adhesion and condensation issues.
Innovation Solution
The use of negatively chargeable toner particles combined with layered-structure compound particles, where the volume-average particle diameter of the layered-structure compound particles is between 0.4 μm and 3.0 μm, and the ratio of their diameters to the toner particles is between 0.044 and 0.625, to prevent adhesion and aggregation by enhancing lubrication effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If layered-structure compound particles with volume-average particle diameter Da < 0.4 μm or Da ≥ 3.0 μm or Da/Db ratio < 0.044 or Da/Db ratio > 0.625 are used, then the toner can be manufactured with conventional particle sizes, but the toner aggregates in replenishment toner containers when environment changes from high-temperature and high-humidity to low-temperature and low-humidity
Solution Approach 1:
The patent optimizes the particle size parameters of layered-structure compound particles (Da: 0.4-3.0 μm) and their ratio to toner particles (Da/Db: 0.044-0.625) to prevent aggregation. This parameter optimization resolves the contradiction by finding the optimal size range that maintains both manufacturability and storage stability across temperature-humidity changes.
Solution Approach 2:
The patent creates a composite toner system combining toner particles with layered-structure compound particles (such as melamine cyanurate) in specific proportions. This composite structure provides both the manufacturability of conventional toner sizes and the aggregation-preventing properties of optimized layered-structure particles, resolving the reliability issue during storage.
2Reliability
If layered-structure compound particles with optimized Da (0.4-3.0 μm) and Da/Db ratio (0.044-0.625) are used, then toner aggregation is prevented in replenishment toner containers, but the device complexity increases due to precise particle size control requirements
Solution Approach 1:
By establishing specific parameter ranges (Da: 0.4-3.0 μm, Da/Db: 0.044-0.625), the patent simplifies the control process within these boundaries while ensuring aggregation prevention. The parameter optimization resolves the contradiction by defining clear manufacturing targets that maintain reliability without excessive complexity.
3Device complexity
If conventional toner particles are used without optimized layered-structure compound particles, then the toner formulation is simpler, but adhesion and condensation issues occur in toner containers under environmental changes
Solution Approach 1:
The patent incorporates layered-structure compound particles (such as melamine cyanurate) as external additives in specific amounts (0.01-5 parts by weight per 100 parts by weight of toner particles). This composite formulation resolves the contradiction by adding minimal complexity to the toner system while effectively preventing adhesion and condensation under temperature-humidity changes.
Solution Approach 2:
The layered-structure compound particles act as intermediary substances between the toner particles and the container environment. These particles prevent direct adhesion and condensation by providing a protective interface, resolving the harmful effects while maintaining relatively simple toner formulation.
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
Prevents toner adhesion and aggregation in toner containers across varying environmental conditions, ensuring consistent toner supply and performance in image forming apparatuses.
Implementation Method 1
The layered-structure compound particles have a volume-average particle diameter Da of 0.4 μm or more and less than 3.0 μm, and a ratio Da/Db of the volume-average particle diameter Da of the layered-structure compound particles to a volume-average particle diameter Db of the toner particles is 0.044 or more and 0.625 or less, thereby making it unlikely to aggregate in a replenishment toner container
Data Source
AI summary
An electrostatic charge image development toner that is negatively chargeable contains toner particles and layered-structure compound particles. The layered-structure compound particles have a volume-average particle diameter Da of 0.4 μm or more and less than 3.0 μm. The ratio Da/Db of the volume-average particle diameter Da of the layered-structure compound particles to the volume-average particle diameter Db of the toner particles is 0.044 or more and 0.625 or less.