Nanometer External Additive Toner for Developing Roller Filming
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Solution Overview
Problem
Conventional electrophotographic printers face issues with toner release agents causing filming during high-resolution and high-speed printing, which affects image quality.
Innovation Solution
A developer material with base particles containing a binder resin and colorant, along with an external additive that covers the surface of the base particles, is used. The external additive has a mean particle diameter of 30-110 nm and is in the range of 1.0-3.0 weight parts based on 100 weight parts of the base particles, improving the toner's flowability and preventing filming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the ratio of toner release agent to colorant is increased to improve image quality, then image quality is improved, but filming occurs during high-resolution and high-speed printing
Solution Approach 1:
The patent changes the particle size parameter of the external additive to the nanometer range (30-110 nm) and optimizes its quantity (1.0-3.0 weight parts), which fundamentally alters the toner's surface properties and flow characteristics, preventing filming while maintaining image quality
Solution Approach 2:
The external additive acts as an intermediary substance between the toner particles and the developing roller surface, preventing direct contact and adhesion that causes filming, while still allowing sufficient toner transfer for high-quality imaging
2Productivity
If high-resolution and high-speed printing is implemented, then productivity is improved, but filming occurs due to toner release agent
Solution Approach 1:
The patent introduces nanometer-sized external additives (30-110 nm) that fundamentally change the toner's surface characteristics and flow behavior, enabling high-speed printing without the filming problem that plagues conventional toner formulations
Solution Approach 2:
The external additive is pre-applied to the toner particles during manufacturing, creating a protective surface layer before the toner enters the printing process, which prevents filming from occurring during high-speed operation
Data Source
AI summary
A developer material includes base particles that contain at least a binder resin and a colorant, and an external additive that covers the surface of the base particles. The developer material has a mean volume particle diameter in the range of 3.9-6.1 μm, and includes pulverized base particles of an external additive. The external additive has a mean particle diameter in the range of 30-110 nm, the external additive being in an amount in the range of 1.0-3.0 weight parts based on 100 weight parts of the base particles. The external additive covers a surface of the base particles, a surface area of the base particles being covered with said external additive, the surface area being in the range of 30.6-58.6% of a total surface area of the base particles.