Core-Sheath Nanofiber Fuser Coating for Release and Wear Resistance
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Solution Overview
Problem
Conventional fuser members in electrophotographic printing devices face challenges with materials that lack a combination of low surface energy, flexibility, thermal conductivity, and mechanical robustness, leading to issues like image offset, wear, and scratches, which affect the quality and longevity of the fuser members.
Innovation Solution
The development of core-sheath nanofibers produced by coaxial electrospinning, featuring a high-performance polymer core and a solvent-insoluble fluororesin or solvent-soluble fluoropolymer sheath, which are processed to form a non-woven fabric topcoat layer that enhances mechanical strength, thermal conductivity, and surface energy properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If materials with low surface energy are used for the topcoat layer, then good release properties are achieved, but mechanical strength is reduced
Solution Approach 1:
The patent applies composite materials by combining a core material (providing mechanical strength) with a sheath material having low surface energy (providing release properties). The core-sheath nanofiber structure integrates two different materials to simultaneously achieve both mechanical robustness and low surface energy, resolving the contradiction between strength and release properties.
2Strength
If materials with mechanical robustness are used for the topcoat layer, then fuser member life is extended, but thermal conductivity is poor
Solution Approach 1:
The core-sheath composite structure allows the core material to provide mechanical robustness while the sheath material maintains adequate thermal conductivity. This composite approach resolves the contradiction by distributing functional requirements to different material components.
3Ease of manufacture
If conventional materials are used for the topcoat layer, then manufacturing is simpler, but wear resistance is reduced
Solution Approach 1:
The patent changes the structural parameter of the topcoat from conventional homogeneous layers to core-sheath nanofibers with controlled diameter ratios and material compositions. This parameter change enables improved wear resistance while maintaining manufacturing feasibility through established electrospinning and coating technologies.
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 core-sheath nanofiber topcoat layer improves the mechanical robustness, thermal conductivity, and surface energy of fuser members, reducing wear, scratches, and image offset, while enabling efficient oil-less fusing processes, thus enhancing the performance and longevity of fuser members in electrophotographic printing devices.
Implementation Method 1
coaxial electrospinning the core and sheath solutions to form a plurality of core-sheath polymer nanofibers
Implementation Method 2
heating the core-sheath nanofibers to a first temperature ranging from about 100° C. to about 280° C.; and heating the core-sheath nanofibers to a second temperature ranging from about 285° C. to about 380° C.
Data Source
AI summary
Exemplary embodiments provide core-sheath nanofibers produced by coaxial electrospinning, fuser members comprising core-sheath nanofibers, and methods for forming core-sheath nanofibers that can include a core solution comprising a high performance polymer and sheath solutions comprising a solvent-soluble fluoropolymer or solvent-insoluble fluororesins and a sacrificial polymeric binder.