Toner Shape and Sleeve Roughness for Image Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electrophotography methods face challenges in achieving high-quality image formation with uniformity and dot reproducibility due to issues with toner shape, size, and surface roughness, leading to increased toner usage and environmental waste.
Innovation Solution
An image forming method utilizing toner particles with specific size and shape coefficients, combined with a development sleeve surface roughness within a predetermined range, to form a uniform toner thin layer with high density, ensuring high-quality images with reduced toner usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the shape of the toner is restricted to be small-sized, then the cleaning performance and transferring performance are improved, but the liquidity of the toner is lowered and the content of fine particles increases
Solution Approach 1:
The invention changes the physical parameters of the toner particles by specifying precise shape coefficients (SF-1: 1.05-1.15, SF-2: 1.03-1.13) and particle size distribution (volume average 4.0-6.0 μm, with controlled fine particle content). This parameter optimization resolves the contradiction by achieving good cleaning and transfer performance without excessive fine particles, as the shape coefficients control the morphology to prevent agglomeration while maintaining small effective size for cleaning efficiency.
2Quantity of substance
If a larger toner amount is used to obtain predetermined image concentration, then the image concentration is ensured, but the wasted toner becomes larger
Solution Approach 1:
The invention optimizes toner utilization efficiency by controlling particle size distribution (volume average 4.0-6.0 μm with specific fine particle content of 5-20%) and shape coefficients. These parameter changes ensure that the toner forms a uniform thin layer on the photoreceptor with high transfer efficiency, achieving predetermined image concentration with reduced toner application amount and minimizing post-transfer residual toner waste.
Solution Approach 2:
The invention applies partial action by using a controlled amount of toner with optimized characteristics rather than excessive toner. The specific particle size and shape parameters enable the toner to achieve maximum imaging effectiveness at lower concentrations, avoiding the waste associated with over-application while still ensuring sufficient image concentration.
3Quantity of substance
If the toner particles with small size are used, then the image concentration is improved, but the dot reproducibility and image uniformity are degraded
Solution Approach 1:
The invention resolves this contradiction by implementing a comprehensive parameter control system: volume average particle size of 4.0-6.0 μm provides sufficient small size for image concentration, while the shape coefficients (SF-1: 1.05-1.15, SF-2: 1.03-1.13) ensure regular morphology for uniform distribution. The controlled fine particle content (5-20%) prevents excessive aggregation, achieving both high image concentration and good dot reproducibility.
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
The method achieves high-quality image formation with sufficient concentration and dot reproducibility while minimizing toner usage, thereby reducing environmental impact and improving image uniformity.
Implementation Method 1
a ten-point average roughness Rz on the surface of the development sleeve is from 3.0 to 5.7 μm... to form a uniform toner thin layer with high density
Implementation Method 2
the surface of an electrostatic image supporting material (hereinafter, also referred to as a photoreceptor) is uniformly charged and an electrostatic image is formed by exposure to light
Implementation Method 3
an electrostatic image is formed by exposure to light under a predetermined manuscript information
Implementation Method 4
the toner image is transferred onto a predetermined form, and by heating and pressurizing with a fixing roller, the toner image is fixed
Data Source
AI summary
Disclosed is an image forming method, containing a development step of developing an electrostatic latent image formed on an electrostatic image supporting material using a toner formed on a development sleeve in the from of a thin layer to form a toner image, wherein a ten-point average roughness Rz on the surface of the development sleeve is from 3.0 to 5.7 μm, a volume average particle size of toner particles is from 6.0 to 8.0 μm, the content of a volume average particle size of the toner particles of 5.0 μm or less is from 2.2 to 11.0% by volume, a shape coefficient SF-1 of the toner particles that is measured by an image-analyzing apparatus satisfies the relation: 115≦SF-1≦155, and a shape coefficient SF-2 of the toner particles that is measured by an image-analyzing apparatus satisfies the relation: 112≦SF-2≦150.