Nanofiber Web Coalescing Filtration Medium
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Solution Overview
Problem
Current filtration media for removing liquid aerosols, oil, and water from gas streams face challenges in achieving high efficiency with low pressure drop, high air permeability, and minimal basis weight while requiring multiple filter layers.
Innovation Solution
A nanofiber web composed of a single layer of continuous, substantially polyolefin-free, polymeric nanofibers with diameters between 50 to 500 nm and a basis weight of 10 to 75 g/m², formed through electroblowing, which allows for efficient filtration with reduced handling and defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple filter layers are used to improve filtration efficiency, then contamination removal is enhanced, but pressure drop increases and air permeability decreases
Solution Approach 1:
The patent changes the fundamental parameters of the filter medium by using nanofibers with diameters of 50-500 nm instead of conventional microfibers. This parameter change enables achieving high filtration efficiency (99.5% or greater) with significantly reduced pressure drop and maintained air permeability, as the nanofibers create fewer flow restrictions while providing sufficient surface area for contaminant capture
Solution Approach 2:
The patent employs composite nanofiber structures formed through electroblowing processes, combining multiple nanofibers into a cohesive nonwoven mat. This composite approach allows the filter to achieve the necessary mechanical strength and filtration performance with a single layer, eliminating the need for multiple layers that would otherwise be required to reach 99.5% filtration efficiency
2Reliability
If multiple filter layers are used to improve filtration efficiency, then contamination removal is enhanced, but air permeability decreases
Solution Approach 1:
By changing the fiber diameter parameter to the nanoscale range (50-500 nm), the patent enables the filter medium to maintain high air permeability while achieving superior filtration efficiency. The nanofibers create a porous structure with sufficient open space for air flow while providing adequate surface area for contaminant capture, eliminating the trade-off present in conventional multi-layer filters
3Reliability
If conventional filter materials are used to achieve high filtration efficiency, then contamination removal is enhanced, but basis weight increases and cost rises
Solution Approach 1:
The patent fundamentally changes the material parameter by using nanofibers instead of conventional microfibers. This parameter change allows the filter to achieve 99.5% or greater filtration efficiency with a basis weight of 10-75 g/m², significantly reducing the quantity of material required compared to conventional filters that would require multiple layers and higher basis weights to achieve the same performance
Solution Approach 2:
The patent employs disposable nanofiber filter media that achieve high performance with minimal material usage. The electroblown nanofiber nonwoven structure provides sufficient filtration efficiency in a single use, eliminating the need for expensive multi-layer constructions and reducing overall filter cost while maintaining reliability
4Reliability
If conventional filter materials are used to achieve high filtration efficiency, then contamination removal is enhanced, but the number of layers increases
Solution Approach 1:
The patent creates a composite nanofiber structure through the electroblowing process that achieves high filtration efficiency in a single layer. The composite nature of the nanofiber mat, with its three-dimensional random arrangement and interconnected structure, provides sufficient surface area and flow paths to achieve 99.5% or greater filtration without requiring multiple stacked layers, thereby simplifying the device structure
Solution Approach 2:
By changing the fiber diameter parameter to the nanoscale, the patent enables a single layer to provide the filtration performance previously requiring multiple layers. The nanofiber scale creates sufficient surface area and flow distribution in one layer to achieve high filtration efficiency, eliminating the complexity of multi-layer construction while maintaining reliability
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 nanofiber web achieves filtration efficiencies of at least 99.5% with low pressure drop and high air permeability, extending filter life and reducing production costs by minimizing basis weight and number of layers.
Implementation Method 1
A coalescing filtration medium for removing liquid aerosols, oil and/or water from a gas stream consisting of a nanofiber web of a single nanofiber layer of continuous, substantially polyolefin-free, polymeric nanofibers
Implementation Method 2
formed through electroblowing
Data Source
Figure 1
AI summary
A coalescing filtration medium is disclosed for removing liquid aerosols, oil and/or water from a gas stream. The medium contains a nanofiber web of at least one nanofiber layer of continuous, substantially polyolefin-free, polymeric nanofibers, each nanofiber layer having an average fiber diameter less than about 800 nm and having a basis weight of at least about 2.5 g/m¿2?.