Gradient Density Filter Web with Embedded Active Particulates
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Solution Overview
Problem
Existing filtration media face challenges in achieving high efficiency, low-pressure drop, and robust mechanical stability while effectively removing reactive, absorbable, or odor-causing components from fluid phases, particularly due to mechanical instability of particulates and limited active material loading.
Innovation Solution
A filter media comprising a substantially continuous fine fiber layer with reactive, absorptive, or adsorptive particulates dispersed throughout, which can be used in flow-through or flow-by modes to treat fluid streams, eliminating the need for PTFE or other fluoropolymer components and enhancing mechanical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dense mats of fiber are used in surface loading filter media, then filtration efficiency is improved, but pressure drop increases and mechanical stability decreases
Solution Approach 1:
The patent applies local quality by creating a gradient density structure where the fiber mat has varying density from the inlet side to the outlet side. The inlet side has higher density for efficient particle capture, while the outlet side has lower density to maintain low pressure drop and allow easy passage of cleaned fluid. This spatial variation in density resolves the contradiction between filtration efficiency and pressure drop.
Solution Approach 2:
The patent uses composite materials by combining fibers with different properties in the mat structure. The mat incorporates a mixture of fine fibers for particle capture and coarser fibers for structural support and fluid passage. This composite structure enables the mat to simultaneously achieve high filtration efficiency through fine fibers while maintaining low pressure drop and good mechanical stability through the coarser fiber network.
2Quantity of substance
If thick structures of fiber are used in depth media, then particulate loading capacity is improved, but pressure drop increases
Solution Approach 1:
The patent applies local quality by creating a gradient density structure where the fiber mat has varying density from the inlet side to the outlet side. The inlet side has higher density for efficient particle capture, while the outlet side has lower density to maintain low pressure drop and allow easy passage of cleaned fluid. This spatial variation in density resolves the contradiction between filtration efficiency and pressure drop.
Solution Approach 2:
The patent transitions from traditional two-dimensional surface loading to three-dimensional depth media with gradient density. By utilizing the thickness dimension and creating density gradients through the mat structure, the patent achieves high particulate loading capacity distributed throughout the volume while maintaining low pressure drop through the optimized density distribution.
3Quantity of substance
If active particulate material is loaded onto substrate, then reactive/absorptive capacity is improved, but mechanical stability decreases due to particulate dislodgement
Solution Approach 1:
The patent merges the active particulate material with the fiber mat structure by embedding the particles within the fiber network and using binder materials to create a unified composite structure. This integration ensures that the active particles remain mechanically stable and cannot be dislodged, while maintaining their reactive and absorptive capacities. The fiber mat and particulate material become a single integrated filtering medium.
Solution Approach 2:
The patent uses composite materials by combining fibers with different properties in the mat structure. The mat incorporates a mixture of fine fibers for particle capture and coarser fibers for structural support and fluid passage. This composite structure enables the mat to simultaneously achieve high filtration efficiency through fine fibers while maintaining low pressure drop and good mechanical stability through the coarser fiber network.
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 solution provides improved filtration efficiency, extended lifetime, and reduced pressure drop, enabling effective removal of both particulate and reactive components from fluid streams with enhanced mechanical stability and increased active material utilization.
Implementation Method 1
The filter media can act as a reactive, adsorptive or absorptive layer
Implementation Method 2
The filter media can act as a reactive, adsorptive or absorptive layer
Implementation Method 3
The particulate can react with materials entrained in the mobile fluid phase
Implementation Method 4
the filter media...in a filtration mode...separate the particulate load from a mobile fluid stream
Data Source
Figure 1A~1B
Figure 2
Figure 3
AI summary
The assemblies of the invention can comprise a fine fiber layer having dispersed within the fine fiber layer an active particulate material. Fluid that flows through the assemblies of the invention can have any material dispersed or dissolved in the fluid react with, be absorbed by, or adsorbed onto, the active particulate within the nano fiber layer. The structures of the invention can act simply as reactive, absorptive, or adsorptive layers with no filtration properties, or the structures of the invention can be assembled into filters that can filter particulate from a mobile fluid while simultaneously reacting, absorbing, or adsorbing materials from the mobile fluid.