Fuser Release Layer Homogeneity via Tribocharging Mediator
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Solution Overview
Problem
Conventional fuser members in electrophotographic printing face challenges with non-homogeneous release layers due to separation of fluoroplastic and aerogel powders during powder coating, leading to incomplete curing and poor release performance, especially in achieving low gloss and high-speed printing.
Innovation Solution
A coating composition comprising fluorine-containing particles, aerogel particles, and positive tribocharging particles is used, where the positive tribocharging particles associate with both fluoroplastic and aerogel particles to form a homogeneous mixture, enhancing wetting and cohesion during curing, thereby forming a cohesive and low-gloss release layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluoroplastic and aerogel powders are used in powder coating, then low gloss and release performance are improved, but the powders separate during coating leading to non-homogeneous release layers
Solution Approach 1:
A charge control agent is introduced as an intermediary substance between fluoroplastic and aerogel powders. This agent has opposite charge to both powder types, causing them to associate with it and form a homogeneous mixture during powder coating. The charge control agent acts as a mediator that prevents separation of the immiscible fluoroplastic and aerogel powders, enabling uniform distribution in the release layer while maintaining the desired low gloss and release performance.
2Manufacturing precision
If aerogel particles are added to fluoroplastic coating, then surface properties and low gloss are achieved, but curing becomes incomplete due to poor wetting and cohesion
Solution Approach 1:
The charge control agent serves as a mediator that improves wetting and cohesion between aerogel particles and fluoroplastic matrix during curing. By associating with both components through electrostatic attraction, it enhances the interfacial adhesion and ensures complete curing of the coating, thereby maintaining the desired low gloss surface properties while achieving reliable cure completion.
3Ease of manufacture
If conventional powder coating is used with fluoroplastic and aerogel, then coating application is simple, but the process results in non-homogeneous layers requiring rework
Solution Approach 1:
The charge control agent enables conventional powder coating processes to produce homogeneous release layers by preventing separation of fluoroplastic and aerogel powders during application. This intermediary substance allows the simple powder coating method to achieve uniform distribution of aerogel particles throughout the fluoroplastic matrix, eliminating the need for complex processing or rework while maintaining manufacturing precision.
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 solution enables the formation of a homogeneous powder mixture during powder coating, maintaining the desired aerogel ratio and improving film cohesion, resulting in a suitable release layer for low gloss fusing applications with improved toner release and paper stripping performance.
Implementation Method 1
positive tribocharging particles wherein the positive tribocharging particles associate with the fluoroplastic particles and the aerogel particles
Implementation Method 2
The coated layer is heated to a temperature of from about 260° C. to about 380° C. to cure the fluorine containing particles to form a release layer
Data Source
AI summary
The present teachings disclose a surface coating composition. The surface coating composition includes fluorine containing particles, aerogel particles and positive tribocharging particles. The surface coating is useful as the release layer for fuser members.