Three-Dimensional Air Filter Medium for Dust Holding With Low Pressure Loss
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Solution Overview
Problem
Existing air filter media face challenges in achieving high collection efficiency while maintaining low pressure loss during gas passage, particularly in capturing dust and other particles.
Innovation Solution
The air filter medium incorporates a resin-based structure with convex portions that protrude in the air flow direction, utilizing a fluororesin porous membrane with a specific composition and structure, including fibril-forming PTFE, non-fibril-forming non-melting-processable components, and non-fibril-forming hot-melt-processable components to enhance dust-holding capacity and maintain strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional air filter media are used, then dust collection efficiency can be achieved, but pressure loss increases during gas passage
Solution Approach 1:
The filter medium is transformed from a flat two-dimensional structure to a three-dimensional structure with convex portions protruding in the air flow direction. This dimensional change increases the effective filtration surface area without increasing the projected area, allowing more dust capture while maintaining low pressure loss through the original flow path
Solution Approach 2:
The invention uses a porous fluororesin membrane with specific pore structure and composition (including PTFE and other components) that provides both high dust collection efficiency through the porous structure and low pressure loss through optimized pore distribution and size
2Quantity of substance
If the projected area of convex portions is increased, then dust-holding capacity improves, but the filter medium structure becomes more complex
Solution Approach 1:
The filter medium surface is segmented into multiple convex portions distributed across the area, each contributing to dust capture. This segmentation increases the effective filtration area and dust-holding capacity while maintaining a relatively simple overall structure that can be manufactured using conventional techniques
Data Source
AI summary
An air filter medium includes a resin having a plurality of first convex portions protruding from a first surface of the filter medium in an air flow direction relative to the filter medium and a plurality of second convex portions protruding from a second surface that is a back surface of the first surface of the filter medium in the air flow direction. The total projected area of the plurality of first convex portions and the plurality of second convex portions in a case where an entirety of the filter medium is projected in the air flow direction is 50% or more and 100% or less of a projected area of the entirety of the filter medium in a case where the entirety of the filter medium is projected in the air flow direction.