Process Cartridge Toner High-Density Packing
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Solution Overview
Problem
Existing electrophotographic process cartridges face challenges in achieving high-density toner packing while maintaining image quality and reliability, as high flowability toners lead to air inclusion and reduced image density, and low flowability toners result in image failures due to poor stirring and supply issues.
Innovation Solution
A process cartridge with a toner container equipped with a stirring member, where the toner has a uniaxial collapse stress of 2.0 kPa to 4.5 kPa and a loading density of 0.70 g/cm3, and contains organic-inorganic composite fine particles with specific structural features to enhance adhesive force and flowability, ensuring stable image formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If toner is loaded at high density to reduce apparatus size and space, then space savings are achieved, but air is included during loading and image density decreases
Solution Approach 1:
The patent applies parameter changes by precisely controlling toner physical properties (uniaxial collapse stress between 2.0-4.5 kPa, loading density of 0.70 g/cm³ or more, and total energy between 70-95 mJ) to achieve high-density loading while preventing air inclusion and maintaining image quality. This resolves the contradiction by finding the optimal parameter range that satisfies both space reduction and image density requirements.
2Productivity
If toner flowability is increased to improve loading speed, then loading time is reduced, but air is included during loading and image density decreases
Solution Approach 1:
The patent resolves this contradiction by changing the toner's physical parameters, specifically controlling the uniaxial collapse stress to 2.0-4.5 kPa and total energy to 70-95 mJ. This optimal parameter range enables sufficiently high loading speed while preventing air inclusion, thereby maintaining both productivity and image density reliability.
3Volume of stationary object
If toner is loaded at additionally high density to reduce space, then space savings increase, but toner is not stirred well and image failure occurs
Solution Approach 1:
The patent applies parameter changes by optimizing the toner's uniaxial collapse stress (2.0-4.5 kPa) and total energy (70-95 mJ) to achieve high-density loading while ensuring adequate stirrability. These controlled parameters allow the toner to be densely packed yet still properly stirred during operation, preventing image failure and maintaining reliability.
Solution Approach 2:
The patent employs composite materials by incorporating organic-inorganic composite fine particles into the toner composition. This composite structure enhances both the adhesive force and flowability of the toner, enabling high-density packing while maintaining proper stirring characteristics and preventing image failure during continuous operation.
4Duration of action of stationary object
If process cartridge volume is increased to accommodate more toner, then lifetime is extended, but apparatus size and space consumption increase
Solution Approach 1:
The patent resolves this contradiction by changing the loading density parameter to 0.70 g/cm³ or more, which allows more toner to be packed into a smaller volume. This enables extension of the process cartridge lifetime without increasing the apparatus size, as the higher density packing accommodates sufficient toner capacity in a compact form factor.
Data Source
AI summary
Provided is a process cartridge by which the stability of an image having a high print percentage can be obtained even when high-density loading is performed. The process cartridge is a process cartridge in which a toner having a uniaxial collapse stress at the time of a maximum consolidation stress of 10.0 kPa of 2.0 kPa or more and 4.5 kPa or less, and a total energy measured after its compression of 70 mJ or more and 95 mJ or less is stored in a toner container in a state in which the container has a loading density of 0.70 g/cm3 or more.