Multi-layer Filter Media with Melt-blown and Electrospun Fibers
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Solution Overview
Problem
Electrospun nanofiber media filters have a short lifespan due to heavy particle loading, which clogs the nano-pore sizes, reducing their filter efficiency and increasing pressure drop, leading to insufficient fluid flow over time.
Innovation Solution
A multi-layer filter media configuration is introduced, featuring a melt-blown fiber filter media layer with substantial depth loading capability upstream of an electrospun nanofiber media layer, where the melt-blown fiber layer captures larger particles and the electrospun nanofiber layer captures smaller particles, maintaining high filtration efficiency while extending filter life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrospun nanofiber media is used as filter, then filtration efficiency is improved, but filter life span deteriorates due to heavy particle loading
Solution Approach 1:
The filter is divided into multiple layers with different functions: upstream melt-blown fiber layers for depth loading and downstream electrospun nanofiber layers for high-efficiency filtration. This segmentation allows each layer to perform its specialized function, preventing the nanofiber layer from becoming clogged while maintaining high filtration efficiency.
Solution Approach 2:
The melt-blown fiber layer acts as an intermediary between the fluid stream and the electrospun nanofiber layer. It captures larger particles and distributes particle loading throughout its depth, protecting the nanofiber layer from heavy particle loading and extending the overall filter life.
2Reliability
If electrospun nanofiber media with nano pore sizes is used, then filter efficiency is improved, but pressure drop increases due to particle loading
Solution Approach 1:
The filter is segmented into layers that handle different particle sizes and loading capacities. The melt-blown fiber layer absorbs the majority of particle loading through depth filtration, preventing excessive pressure drop across the sensitive nanofiber layer while maintaining overall filtration efficiency.
3Duration of action of stationary object
If melt-blown fiber layer with substantial depth loading capability is placed upstream, then particle loading is distributed throughout media depth, but device complexity increases
Solution Approach 1:
The filter consists of multiple layers with distinct functions: upstream melt-blown fiber layers for depth loading and downstream electrospun nanofiber layers for high-efficiency filtration. This segmentation distributes particle loading throughout the media depth, extending filter life while maintaining manageable complexity through functional specialization.
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
This configuration enhances filtration efficiency and extends filter life by distributing particle loading throughout the depth of the media, reducing pressure drop and maintaining fluid flow, making it suitable for high-capacity filtration applications.
Implementation Method 1
a jet of charged fluid accelerates and thins in the electrostatic field and is attracted toward a collector
Implementation Method 2
The at least one melt-blown fiber filter media layer has substantial depth loading capability that appears to avoid clogging of the electro-spun fibers layer
Data Source
AI summary
A multi-layer filter media including at least one layer of melt-blown fiber filter media and at least one layer of electrospun nanofiber filter media is provided. The multi-layer filter media of the present invention is configured such that the at least one layer of the melt-blown fiber filter media is on the upstream and the at least one electrospun nanofiber filter media is positioned downstream of the at least one melt-blown fiber filter media.