Nonwoven Air Filter Media with Segmented Fibers
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Solution Overview
Problem
Current HVAC systems face challenges in achieving high filtration efficiency for viral particles, such as SARS-CoV-2, due to limitations in MERV ratings, pressure drop issues, and shortages of high-efficiency filters, necessitating a new source of filtration media that can provide both high efficiency and low pressure drop.
Innovation Solution
A nonwoven material blend of predominantly monocomponent fibers with partially split segmented fibers, comprising different polymers, which offers high filtration efficiency while maintaining acceptable pressure drop levels, achieved through specific weight ratios and fibrillation of segmented fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MERV 13 or higher filters are used to capture viral particles, then filtration efficiency is improved, but pressure drop increases
Solution Approach 1:
The filter media is segmented into multiple layers with different functions: a first layer containing monocomponent fibers for structural support and airflow, and a second layer containing segmented bicomponent fibers with electrostatic charges for viral particle capture. This segmentation allows each layer to optimize its specific function without compromising the other, achieving high filtration efficiency while maintaining acceptable pressure drop.
Solution Approach 2:
The invention uses composite filter media combining monocomponent fibers (providing structural integrity and airflow) with bicomponent fibers (providing electrostatic capture capability). The bicomponent fibers consist of a first polymer and a second polymer with different properties, creating a composite structure that simultaneously achieves high filtration efficiency and controlled pressure drop characteristics.
2Reliability
If high efficiency filters are deployed to capture SARS-CoV-2, then viral particle removal is improved, but system compatibility deteriorates
Solution Approach 1:
Different regions of the filter media have different qualities: the first layer provides structural support and airflow characteristics, while the second layer provides electrostatic capture. This local differentiation allows the filter to maintain compatibility with existing HVAC systems while achieving high viral particle removal efficiency through the specialized second layer.
3Device complexity
If conventional filtration media are used, then system simplicity is maintained, but filtration efficiency for viral particles is insufficient
Solution Approach 1:
The invention merges the functions of structural support, airflow maintenance, and viral particle capture into a single integrated filter media structure. The first layer of monocomponent fibers provides structure and airflow, while the second layer of segmented bicomponent fibers provides capture capability, combining multiple functions without requiring separate systems.
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 nonwoven material achieves filtration efficiencies comparable to MERV 13-rated filters with lower pressure drops, suitable for use in HVAC systems, addressing the need for improved air filtration without compromising airflow.
Implementation Method 1
the segmented fibers are at least partially fibrillated or split
Implementation Method 2
A nonwoven material blend of predominantly monocomponent fibers with partially split segmented fibers, comprising different polymers, which offers high filtration efficiency
Data Source
AI summary
The present disclosure provides a nonwoven material including a blend of a first plurality of monocomponent fibers and a second plurality of segmented fibers having segments of a first polymer and segments of a second polymer different from the first polymer, wherein the nonwoven material includes about 75 to about 95% by weight of the monocomponent fibers, and about 5 to about 25% by weight of the segmented fibers, based on the total weight of the nonwoven material, and wherein the segmented fibers are at least partially fibrillated or split. An air filter including the nonwoven material is also provided.