Multilayer Filter Medium Segmentation for Deodorizing Stability
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Solution Overview
Problem
Air filters with deodorizing performance suffer from deteriorated performance over time and high pressure drop due to the use of functional particles with mixed particle diameters in a single interlayer region, making them unsuitable for air filter applications.
Innovation Solution
A multilayer filter medium with three or more nonwoven fabric layers, featuring two interlayer regions with functional particles of different average particle diameters (50-100 μm and 150-500 μm) and basis weights (20-80 g/m² and 20-600 g/m² respectively), one region with acidic gas adsorption capability and the other with basic gas adsorption capability, to maintain deodorizing performance and reduce pressure drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If functional particles with small particle diameter are used to improve deodorizing performance, then deodorizing performance is improved, but pressure drop increases
Solution Approach 1:
The filter medium is divided into multiple interlayer regions, each containing functional particles of different particle diameters. This segmentation allows the filter to achieve both high deodorizing performance (through small particle diameter regions) and low pressure drop (through large particle diameter regions) simultaneously, resolving the technical contradiction between these two parameters.
2Stability of the object's composition
If functional particles with large particle diameter are used to suppress deterioration after long-term storage, then stability is improved, but deodorizing performance decreases
Solution Approach 1:
Different interlayer regions are assigned different particle sizes based on their functional requirements. Regions requiring long-term stability use large particle diameter functional particles, while regions requiring high deodorizing performance use small particle diameter functional particles. This spatial segmentation resolves the contradiction between stability and performance.
Solution Approach 2:
Each interlayer region is given locally optimized properties (particle diameter) according to its specific functional requirements. This allows the filter medium as a whole to achieve both high deodorizing performance and long-term stability, as each region contributes its optimized特性 to the overall system.
3Reliability
If multiple functional particles with different particle diameters are arranged in a single interlayer region, then both deodorizing performance and stability are improved, but pressure drop increases
Solution Approach 1:
Instead of mixing different particle sizes in a single interlayer region, the invention segments the filter medium into multiple interlayer regions, each dedicated to a specific particle size. This spatial separation maintains the benefits of both small and large particle diameters while avoiding the pressure drop increase that would result from their mixture in one region.
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 multilayer filter medium effectively suppresses deterioration of deodorizing performance over time while maintaining low pressure drop, ensuring superior air filtration efficiency and handling.
Implementation Method 1
at least one of the functional particles A and the functional particles B chemically adsorb volatile organic compound gas
Implementation Method 2
at least one of the functional particles A and the flat functional particles B selectively and chemically adsorb aldehyde gas
Implementation Method 3
a multilayer filter medium including three or more nonwoven fabric layers superposed together
Data Source
AI summary
The challenge of the present invention is to provide a multilayer filter medium whose deodorizing performance after a long-term storage of the filter medium is suppressed from deteriorating and which is superior in deodorizing performance and exhibits low pressure drop. A multilayer filter medium includes three or more nonwoven fabric layers superposed together and has two or more interlayer regions each formed by two adjacent layers of the nonwoven fabric layers, in which a first interlayer region of the interlayer regions contains functional particles A having an average particle diameter of 50 to 100 μm, and a second interlayer region selected from the interlayer regions excluding the first interlayer region contains functional particles B having an average particle diameter of 150 to 500 μm.