Nanofiber Composite Filter Fabric for Sub-5 Micron Particle Separation
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Solution Overview
Problem
Current filtering fabrics cannot separate particles smaller than 1-2 microns due to technological limitations in weaving, which restricts mesh openings to greater than 5 microns, and lack precision and selectivity in filtering, as well as adequate powder filtering and acoustical impedance control.
Innovation Solution
A composite fabric construction combining nanofiber layers with a synthetic single-thread squarely knitted precision fabric, where the nanofiber layer is electro-spun and embedded or coated on the fabric, potentially with an additional adhesive layer, to create a high-strength filtering membrane with precise filtering properties and reduced acoustical impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a weaving process is used to create filtering fabric, then the fabric has mechanical strength and structural stability, but the mesh opening cannot be less than 5 microns preventing filtration of particles smaller than 1-2 microns
Solution Approach 1:
The patent combines nanofiber material with traditional fabric substrate to create a composite filtering medium. The nanofiber layer provides the fine filtration capability (sub-5 micron mesh size) while the fabric substrate provides mechanical strength and structural stability, resolving the contradiction between achieving small mesh sizes and maintaining manufacturability through conventional weaving processes.
Solution Approach 2:
The patent utilizes nanofibers to create a porous layer with controlled pore sizes below 5 microns. This porous structure enables precise particle filtration down to 1-2 microns while maintaining permeability, overcoming the limitation of traditional weaving processes that cannot achieve such fine mesh sizes.
2Manufacturing precision
If the mesh size is reduced to filter smaller particles, then filtering precision improves, but acoustical impedance increases blocking sound transmission
Solution Approach 1:
The patent applies different properties to different layers of the composite structure. The nanofiber layer provides fine filtration precision with small pore sizes, while the fabric substrate layer provides acoustic permeability. This local differentiation of functions allows the system to achieve both high filtering precision and low acoustical impedance simultaneously.
Solution Approach 2:
The patent transitions from a single-layer fabric structure to a multi-layer composite structure with distinct functional zones. The nanofiber layer handles particle filtration while the fabric substrate handles acoustic transmission, effectively separating the conflicting requirements into different dimensional layers of the composite material.
3Device complexity
If a single-layer fabric is used, then the structure is simple, but the filtering capability is limited and life span is reduced
Solution Approach 1:
The patent creates a composite construction with a nanofiber layer deposited on a fabric substrate. This composite structure enhances filtering capability by combining the fine pore structure of nanofibers with the mechanical durability of fabric, thereby extending the operational life span and improving reliability without excessive complexity.
Solution Approach 2:
The nanofiber layer is deposited and embedded within the fabric substrate structure, creating a nested configuration where the nanofiber layer is integrated into the three-dimensional structure of the fabric. This nesting approach maximizes filtering surface area while maintaining structural integrity and simplicity.
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 composite fabric effectively filters particles down to 2 microns with high efficiency, extends the life span of filtering media, and provides improved permeability and acoustic properties, including protection against magnetic and powder particles while allowing sound to pass through, overcoming limitations of prior fabrics in mesh size and mechanical strength.
Implementation Method 1
The nanofiber layer, in particular, is overlapped or coated on said single-thread fabric by an electro-spinning coating method
Implementation Method 2
A further adhesive material layer, for example an aqueous solution acrylic glue material, may also be deposited on the above fabric construction, to increase the fabric material and nanofibers cohesive binding
Data Source
AI summary
A fabric material composite construction, for use as a filter means or media, characterized in that said construction comprises a combination of one or more nanofiber layers and a synthetic single-thread squarely knitted precision fabric.