Silicone-Coated Self-Supporting Filter Media for E2/E3 Capture
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional air filters face challenges with high pressure drop, low dust loading capacity, and limited efficiency in capturing particles, particularly in the E2 and E3 particle groups, which affects their longevity and air flow.
Innovation Solution
Application of a silicone-based coating on nonwoven fibers used in self-supporting filter media, enhancing the efficiency of capturing contaminants in the E2 and E3 particle groups without compromising other important characteristics like longevity, dust holding capacity, and pressure drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If surface filters with submicron pore size are used to achieve high particle capturing efficiency, then filtration efficiency is improved, but pressure drop increases and dust loading capacity decreases
Solution Approach 1:
The patent employs depth filter materials with controlled pore structures that allow air flow while trapping particles. The porous nature of the depth filter media enables particles to be captured within the matrix rather than requiring tight surface pores, thus maintaining low pressure drop while achieving high efficiency.
Solution Approach 2:
The invention combines depth filter media with a specialized coating layer that has high particle affinity. This composite structure integrates the low resistance of depth filters with the high capture efficiency of the coated surface, resolving the contradiction between pressure drop and filtration efficiency.
2Reliability
If surface filters with submicron pore size are used to achieve high particle capturing efficiency, then filtration efficiency is improved, but dust loading capacity decreases
Solution Approach 1:
The depth filter's porous structure provides extensive internal surface area and tortuous pathways that can accommodate large amounts of captured particles without blocking the flow path completely. This allows high dust loading capacity while maintaining filtration efficiency.
Solution Approach 2:
The coating on the depth filter creates additional capture sites that replicate the particle-trapping function throughout the filter media, effectively increasing the total dust loading capacity by distributing the capture function across multiple locations rather than relying on a single surface layer.
3Device complexity
If conventional fibers are used in self-supporting filter media, then the filter structure is simple and environmentally friendly, but efficiency in capturing E2 and E3 particles is insufficient
Solution Approach 1:
The patent modifies the surface properties of conventional fibers by applying a coating with different physical and chemical parameters. This coating changes the surface energy, pore size distribution, and particle affinity of the filter media, enabling efficient capture of E2 and E3 particles while keeping the base structure simple and incinerable.
Solution Approach 2:
The invention creates a composite fiber structure where conventional incinerable fibers provide the self-supporting framework and the added coating layer provides enhanced particle capture capability. This composite approach maintains environmental friendliness while improving filtration efficiency for fine particles.
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 silicone-based coating significantly improves E2 and E3 filtration efficiency by up to 300% and 100%, maintains low pressure drop, and retains air permeability, making the filters more efficient and environmentally friendly.
Implementation Method 1
The silicone-based coating substantially improves the efficiency of the nonwoven material at capturing contaminants
Data Source
AI summary
Nonwoven material, self-supporting filter media and filters, such as residential and commercial air filters, are provided that comprise a plurality of fibers with a silicone-based coating. The silicone-based coating comprises a silicone compound having an add-on weight of at least about 1.0 gsm. The silicone-based coating increases the efficiency of the filter media at capturing contaminants, particularly contaminants in the E2 and E3 particle group range, without compromising other important characteristics of the filter, such as longevity, dust holding capacity, pressure drop or air permeability. In addition, the filter media allows for the production of self-supporting filters having a Minimum Efficiency Reporting Value of at least MERV 8 that are fully incinerable because they do not include a metal wire backing to hold the shape of the pleats.