Lofted Composite Filtration Sheet for High Air Permeability
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Solution Overview
Problem
Existing fluid filtration technologies face challenges in achieving enhanced air permeability while maintaining the adsorptive or absorptive capacity and kinetics of filtration media, particularly in applications like HVAC systems and water filtration, where high air permeability is crucial.
Innovation Solution
A composite flat sheet structure incorporating high denier lofting fibers, active particles, and binder particles is developed, where the dry mixture is heated to coalesce the active and lofting fibers with the substrate, enhancing air permeability by over 20% without compromising kinetics, and allowing for high loading rates of active particles for effective filtration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high loading rates of active particles are used to maintain adsorptive capacity, then filtration effectiveness is improved, but air permeability deteriorates
Solution Approach 1:
The patent incorporates a porous substrate structure that maintains open pores even with high active particle loading. The substrate's inherent porosity creates pathways for air flow that are not blocked by the particles, allowing high filtration capacity to coexist with high air permeability.
Solution Approach 2:
The patent transitions from two-dimensional particle arrangements to a three-dimensional structured composite where particles are distributed throughout a porous matrix. This dimensional change creates interstitial spaces and flow paths that maintain permeability while accommodating high particle concentrations for effective filtration.
2Reliability
If traditional filtration media are used to achieve adsorptive capacity, then particle capture is improved, but air resistance increases
Solution Approach 1:
The porous substrate provides a three-dimensional network that captures particles through adsorption and interception while maintaining low resistance to air flow. The interconnected pore structure allows air to move through the media with minimal pressure drop, unlike traditional dense filtration materials.
Solution Approach 2:
The patent creates a composite structure combining the porous substrate with active particles. This composite leverages the substrate's flow-friendly porosity while incorporating particles for particle capture, achieving both low air resistance and high filtration effectiveness simultaneously.
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 achieves significantly increased air permeability, reduced air resistance, and improved filtration efficiency, making it suitable for various fluid filtration applications, including air and water filtration, without sacrificing the adsorptive capacity of active particles.
Implementation Method 1
the composite is heated to the softening temperature of the binder particles, but below the melting temperature of the lofting fibers or active particles, to coalesce the active particles and the lofting fibers to each other and to the discrete substrate
Implementation Method 2
the lofting fibers provide greater than about 20% increase in air permeability without sacrificing the kinetics of the composite
Implementation Method 3
the binder particles to adhere to the active particles and the lofting fibers by electrostatic and van der Waal forces
Implementation Method 4
the binder particles to adhere to the active particles and the lofting fibers by electrostatic and van der Waal forces
Data Source
AI summary
A composite of the present invention comprises a substrate having deposited on a surface thereof a dry mixture of active particles, lofting fibers, and binder particles. The composite has increased air permeability and lower air resistance than prior art composites that do not incorporate lofting fibers.