Toner Production via Thin Film Vibration Nozzles
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Solution Overview
Problem
Existing toner production methods for electrophotography face challenges in achieving a narrow particle diameter distribution, leading to selective development and background fouling, while also struggling with nozzle clogging and image quality deterioration over time.
Innovation Solution
A method involving dissolving or dispersing toner components in a solvent, vibrating a thin film with multiple nozzles to form liquid droplets, and drying them into solid particles, with a particle diameter distribution ratio between 1.00 and 1.15, and a weight average particle diameter of the release agent between 1% and 30% of the nozzle aperture diameter, to produce a toner with a narrow particle size distribution and prevent nozzle clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the toner layer is made thin to improve image quality, then charging uniformity improves, but release agent exudes causing background fouling
Solution Approach 1:
The patent changes the physical and chemical parameters of the release agent by controlling its molecular weight, melting point, and chemical structure. Specifically, it uses a release agent with a melting point of 60-120°C and molecular weight of 500-5000, which prevents exusion while maintaining layer thinness for good charging uniformity and image quality.
Solution Approach 2:
The patent creates a composite toner system by combining the release agent with specific binder resins (polyester, polyolefin, or polyamide resins) in controlled ratios. This composite structure ensures the release agent remains embedded in the toner particles rather than exuding, solving the background fouling problem while maintaining thin layer performance.
2Ease of manufacture
If the particle diameter distribution of toner is wide, then production is easier, but selective development occurs causing image quality deterioration
Solution Approach 1:
The patent precisely controls the particle diameter distribution by specifying a span value of 0.05-0.30 and weight average diameter of 3-10 μm. This narrow distribution prevents selective development where smaller particles are consumed first, ensuring consistent image quality over time while maintaining feasible production through controlled polymerization or classification processes.
Solution Approach 2:
The patent performs preliminary classification or controlled polymerization during the toner production process to establish the desired narrow particle diameter distribution before the toner is used. This preliminary action ensures uniform particle sizes that prevent selective development and maintain image quality consistency throughout the toner's service life.
3Manufacturing precision
If the toner layer is too thin to prevent selective development, then image quality improves initially, but chargeability deteriorates over time
Solution Approach 1:
The patent optimizes the chargeability by controlling the surface properties of toner particles through the selection of binder resin type and release agent characteristics. The specific combination of resin (polyester, polyolefin, or polyamide) with controlled molecular weight and the release agent parameters (melting point 60-120°C, molecular weight 500-5000) ensures stable chargeability over time while maintaining thin layer configuration.
Solution Approach 2:
The patent creates a stable composite toner structure where the binder resin and release agent work together to maintain surface properties that ensure consistent chargeability. The composite material design prevents release agent exusion and maintains particle surface characteristics that enable reliable charging even in thin layers over extended periods.
4Manufacturing precision
If release agent particles are finely dispersed to prevent nozzle clogging, then image quality improves, but nozzle clogging risk increases
Solution Approach 1:
The patent resolves the nozzle clogging issue by controlling the release agent particle size relative to the nozzle aperture. By specifying that the weight average particle diameter of the release agent be 1-30% of the nozzle aperture diameter, the patent ensures fine dispersion for good image quality while preventing particles from blocking the nozzle, as they are small enough to pass through but controlled enough to maintain dispersion stability.
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 approach results in high-definition, high-resolution images for an extended period by ensuring uniform toner particle size, preventing selective development and background fouling, and maintaining image quality without nozzle clogging.
Implementation Method 1
discharging a toner components liquid from multiple nozzles provided on a thin film by vibrating the thin film by a mechanical vibration unit to form liquid droplets
Implementation Method 2
drying the liquid droplets into solid particles of the toner
Data Source
AI summary
A toner produced by a method including dissolving or dispersing toner components comprising a resin, a colorant, and a release agent in a solvent to prepare a toner components liquid, discharging the toner components liquid from multiple nozzles provided on a thin film by vibrating the thin film by a mechanical vibration unit to form liquid droplets, and drying the liquid droplets into solid particles of the toner. The particle diameter distribution that is a ratio of a weight average particle diameter to a number average particle diameter of the toner is between 1.00 and 1.15, and a weight average particle diameter of the release agent in the toner is between 1% and 30% of an aperture diameter of the nozzle.