Hollow Carrier Core Material for Stable Electrophotographic Development
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Solution Overview
Problem
Conventional electrophotographic development apparatuses face high running costs and short magnetic carrier replacement intervals due to the deterioration of resin-coated spherical soft ferrite carriers, which limits high-speed development with stable image quality.
Innovation Solution
A carrier core material with an apparent density/true density ratio of 0.25 to 0.40 and specific surface area characteristics, combined with a magnetic oxide and non-magnetic oxide, is developed to reduce stress and extend the magnetic carrier replacement interval, enabling high-speed development with stable image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional spherical soft ferrite carriers with resin coating are used, then stable image quality can be maintained, but the resin deteriorates due to abrasion during agitation, requiring frequent replacement
Solution Approach 1:
The patent segments the carrier structure into a core material and a resin coating layer, where the core material provides structural integrity and the coating provides functional properties. This segmentation allows the core to protect the coating from excessive stress while maintaining necessary abrasion resistance.
Solution Approach 2:
The patent uses composite materials by combining spherical soft ferrite core with resin coating, creating a multi-layer structure that leverages the advantages of both materials: the magnetic properties of ferrite and the protective/coating properties of resin, achieving both image quality stability and extended service life.
2Productivity
If high-speed development is implemented, then productivity increases, but the agitation torque and impact on carriers increase, accelerating resin deterioration
Solution Approach 1:
The patent applies beforehand cushioning by designing a carrier structure with appropriate mechanical properties and coating thickness that can absorb and withstand the increased agitation torque and impact forces generated during high-speed development, preventing premature resin deterioration.
Solution Approach 2:
The patent employs parameter changes by optimizing the physical and chemical parameters of the carrier core material and resin coating (such as hardness, elasticity, coating thickness, and composition) to enable the carrier to withstand higher agitation speeds and forces without excessive wear.
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 new carrier core material significantly extends the magnetic carrier replacement interval by reducing agitation torque and impact on the carrier, allowing for at least 50% longer operation without compromising image quality, while maintaining mechanical robustness and compatibility.
Implementation Method 1
based on the use of a carbonate starting material as a carrier core material starting material and the utilization of the gasified component of this starting material, a hollow structure is generated in the carrier core material
Implementation Method 2
a resin is coated on the surface of these spherical soft ferrites
Data Source
AI summary
The present invention provides a carrier core material for use in the production of an electrophotographic developer which, even when applied, for example, to MFPs (multifunction printers), can realize stable, high-quality and high-speed development, and has a prolonged replacing life of magnetic carriers, and a method of manufacturing the same, a magnetic carrier including the carrier core material, and an electrophotographic developer manufactured from the magnetic carrier. An electrophotographic development carrier is prepared by adding resin particles, a binder, a dispersant, a wetting agent, and water to a raw material powder, wet pulverizing the mixture, drying the pulverized product to give granulated powder, calcinatng the granulated powder, and then sintering the granulated powder to prepare a carrier core material having an internally hollow structure, and coating the carrier core material with a resin. An electrophotographic developer is manufactured by mixing the electrophotographic development carrier with a toner.