Toner Particle Deformation Control for Blade Stability
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Solution Overview
Problem
In electrophotography, toner particles that deform within a specific range when compressed can lead to streaky image defects in image forming apparatuses, especially in low-temperature, low-humidity environments, due to instability in the position of the cleaning blade caused by variations in area coverage during image formation.
Innovation Solution
The development of an electrostatic-image developing toner with toner particles composed of a polyester resin and a styrene (meth)acrylic resin, where the median of deformation ratios to particle diameters is controlled between 8.0% and 18.0%, and the variation in these ratios is maintained between 0.02 and 0.40, to ensure appropriate flexibility and proportion of hard and soft particles, stabilizing the blade position across different area coverages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If toner particles are made to deform within a specific range when compressed, then the toner can provide appropriate flexibility for image formation, but this causes streaky image defects due to blade position instability in low-temperature, low-humidity environments
Solution Approach 1:
The patent changes the physical parameters of toner particles by controlling their deformation ratio (median between 8.0-18.0% and variation between 0.02-0.40) through specific resin composition. This parameter control allows the toner to maintain appropriate flexibility while preventing blade position instability that causes streaky defects
Solution Approach 2:
The patent uses composite materials consisting of polyester resin and styrene (meth)acrylic resin in specific proportions to create toner particles with optimized deformation characteristics. This composite structure enables simultaneous achievement of flexibility and blade position stability
2Duration of action of stationary object
If the cleaning blade contact pressure is reduced to increase service life, then the blade durability improves, but streaky image defects occur due to blade position instability under low contact pressure conditions
Solution Approach 1:
The patent modifies the deformation ratio parameters of toner particles to compensate for low blade contact pressure. By controlling the median deformation ratio between 8.0-18.0% and variation between 0.02-0.40, the toner maintains stable blade positioning even at reduced contact pressures, preventing streaky defects while allowing extended blade service life
3Adaptability or versatility
If toner particles have high deformation ratio to improve flexibility, then the toner adapts better to area coverage variations, but this increases blade position instability and streaky defects
Solution Approach 1:
The patent precisely controls the deformation ratio parameters (median 8.0-18.0%, variation 0.02-0.40) to achieve the optimal balance. This controlled parameter range allows sufficient adaptability to area coverage variations while preventing excessive deformation that would cause blade position instability and streaky defects
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 toner formulation reduces the likelihood of streaky image defects by maintaining blade stability regardless of area coverage, even at low contact pressures and in challenging environmental conditions.
Implementation Method 1
In a micro-compression test where a load of 0.2 mN is applied to the toner particles at a loading rate of 0.098 mN/sec, the median of a distribution of the ratios (%) of deformations of the toner particles to the diameters of the toner particles is 8.0 or more and 18.0 or less
Data Source
AI summary
An electrostatic-image developing toner includes toner particles each including a polyester resin and a styrene (meth)acrylic resin. In a micro-compression test where a load of 0.2 mN is applied to the toner particles at a loading rate of 0.098 mN/sec, the median of a distribution of the ratios (%) of deformations of the toner particles to the diameters of the toner particles is 8.0 or more and 18.0 or less, and a variation in the distribution of the ratios of deformations of the toner particles to the diameters of the toner particles is 0.02 or more and 0.40 or less.