Low Adhesion Coating for Toner Offset in Fuser Rolls
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Solution Overview
Problem
Conventional low temperature, moderate pressure fusing processes in electrophotographic devices and ink jet marking devices face significant toner offset issues due to high adhesion of toner materials to aluminum surfaces, despite the use of release agents, which complicates the fusing process and affects image quality.
Innovation Solution
The implementation of an image fixing system with a pressure member coated with a low adhesion coating having a sliding angle ranging from 1° to 30°, which reduces toner offset by facilitating the release of unfixed images from the coating surface, allowing for effective image fixation on the print medium without the need for release oils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional aluminum fuser roll surface is used, then the fusing process can proceed, but toner offset occurs due to high adhesion of toner materials to the aluminum surface
Solution Approach 1:
The patent applies a release agent layer as an intermediary substance between the aluminum fuser roll surface and the toner material. This release agent (typically a silicone-based compound) mediates the interaction by providing a surface that allows toner to transfer from the substrate to the fuser roll without permanently adhering, thereby preventing toner offset while maintaining reliable fusing performance
Solution Approach 2:
The patent modifies the surface properties of the fuser roll by changing the chemical composition and surface energy parameters through application of release agents. By altering the surface chemistry from native aluminum oxide to a silicone-based release agent coating, the adhesion parameters are changed to achieve optimal toner release characteristics
2Reliability
If release agents are applied to the fuser roll surface to reduce toner offset, then toner release improves, but the system complexity increases due to the release management subsystem
Solution Approach 1:
The patent combines the release agent application function with the existing fuser roll structure by integrating the release management subsystem components (sump, delivery rolls, metering blade) directly into the fuser assembly. This merging approach allows the release agent system to operate in conjunction with the heating and pressure functions already present in the fuser, reducing overall system complexity
Solution Approach 2:
The release management subsystem is designed to automatically replenish and maintain the release agent layer on the fuser roll surface without requiring manual intervention. The sump continuously supplies release agent to the delivery rolls, which automatically apply it to the fuser roll, creating a self-maintaining system that reduces operational complexity
3Manufacturing precision
If conventional fusing processes are used, then image fixation can be achieved, but residue remains on the fuser surfaces affecting image quality
Solution Approach 1:
The release agent serves as a mediator that prevents direct adhesion between the toner material and the aluminum fuser roll surface. By providing this intermediate layer, the toner can be transferred to the substrate during the fusing process without leaving residue on the fuser roll, thereby maintaining high image fixation quality across multiple printing cycles
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 low adhesion coating significantly reduces toner offset, enhances image quality by preventing residue on the fuser surfaces, and enables oil-less fusing processes, extending component life and improving gloss uniformity, thus addressing the limitations of conventional fusing systems.
Implementation Method 1
an outermost layer disposed over the substrate. The outermost layer can include a low adhesion coating having a low sliding angle ranging from about 1° to about 30° with at least one imaging material selected from the group consisting of a solid ink, a toner, hexadecane and water
Data Source
AI summary
Various embodiments provide low adhesion coatings that can be used for an image-side member in an image fixing system of an electrophotographic printer or an ink jet printer, wherein the low adhesion coatings can exhibit a low sliding angle ranging from about 1° to about 30° with a solid ink, a toner, hexadecane and/or water.