Toner Release Agent Spatial Distribution for Offset Resistance
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Solution Overview
Problem
Existing toners face challenges in achieving a balance between offset resistance, charge stability, and background fouling resistance, often resulting in image quality deterioration due to the uneven distribution and exposure of release agents during the fixing process in electrophotography and electrostatic printing.
Innovation Solution
A toner composition with a specific ratio of release agent to binder resin, where the area ratio of the release agent to the toner in cross-sectional images satisfies 0.45≦(S1/S2)≦1.00, ensuring efficient release agent exposure and retention within the toner particles, is developed. This is achieved through a manufacturing method involving the formation of liquid droplets and subsequent solidification into fine particles, with the release agent's content ranging from 1% to 20% by weight and strategically positioned within the toner to prevent adhesion issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the release agent is positioned near the surface of the toner to accelerate exposure during fixing, then offset resistance is improved, but the release agent adheres to other members during stirring in the developing device, causing charge quantity deterioration
Solution Approach 1:
The patent applies local quality by creating a specific spatial distribution of the release agent within the toner particle. The release agent is positioned in an intermediate layer between the surface and the core, with a concentration gradient that is higher near the surface than in the core, but not exposed at the outermost surface. This localized positioning allows the release agent to provide offset resistance during fixing while preventing premature exposure and adhesion to other members during stirring in the developing device.
2Manufacturing precision
If the release agent is protected inside the toner during stirring and storage, then charge stability is improved, but the release agent is not efficiently exposed at the surface during the fixing process
Solution Approach 1:
The patent applies preliminary action by pre-positioning the release agent in an intermediate layer during toner particle formation, preparing it for future exposure during fixing. The release agent is not randomly distributed but strategically placed in a location that will allow controlled exposure when the toner melts during the fixing process, ensuring both charge stability during storage and efficient exposure during fixing.
Solution Approach 2:
The patent applies dynamics by creating a release agent distribution that transitions from a protected state during stirring to an exposed state during fixing. The intermediate layer positioning allows the release agent to remain protected during low-temperature stirring but become exposed as the toner particle melts and the release agent migrates to the surface during high-temperature fixing, providing dynamic adaptability to different process conditions.
3Reliability
If the content of the release agent is excessively increased to achieve hot offset resistance, then offset resistance is improved, but the toner deteriorates in strength and becomes easy to get crushed, causing charge quantity deterioration and background fouling
Solution Approach 1:
The patent applies parameter changes by optimizing the concentration of the release agent within a specific range (1% to 20% by weight) and controlling its spatial distribution through the intermediate layer positioning. This controlled parameter optimization allows sufficient release agent to provide hot offset resistance during fixing while maintaining toner particle strength and integrity during stirring and storage, preventing both offset and toner crushing.
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 toner provides improved offset resistance, charge stability, and high-definition image quality by ensuring the release agent is effectively exposed during the fixing process without compromising toner strength or image quality, extending the duration of high-quality image production.
Implementation Method 1
The release agent is melted in a rapid manner when the toner passes through the heated roller or belt
Implementation Method 2
solidifying the liquid droplets into fine particles
Data Source
AI summary
A toner is provided. The toner includes a binder resin and a release agent. The toner satisfies the following inequation:0.45≦(S1/S2)≦1.00wherein S1 and S2 represent areas of quadrangles circumscribing the release agent and the toner, respectively, in a cross-sectional image of the toner obtained by a transmission electron microscope (TEM).