Multi-Layer Pleatable Filter Medium with Support
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Solution Overview
Problem
Conventional pleated air filters face challenges with media strength and support, as some filtration media are not self-supporting, requiring additional support structures to prevent displacement under air pressure, and existing designs limit the customization of filter characteristics.
Innovation Solution
A pleated filter design featuring a first layer of filtration media laminated with a support material, such as expanded metal or plastic netting, and a second layer of filtration media on the opposite side, allowing for variations in characteristics and increased stiffness, with optional additional layers for enhanced filtration capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single layer of filtration media is used, then the filter structure is simple, but the media lacks sufficient strength to support itself under air pressure
Solution Approach 1:
The patent combines multiple layers of filtration media with a support structure to create a composite filter assembly. The support structure provides mechanical strength while the filtration media layers provide filtration function, resolving the contradiction between strength and complexity by integrating different material types working together.
Solution Approach 2:
The filter is divided into distinct segments: a support structure and multiple filtration media layers. This segmentation allows each component to be optimized independently - the support structure for strength and the media layers for filtration performance - while maintaining overall structural integrity.
2Reliability
If support material is added to prevent media displacement, then the media strength is improved, but the filter structure becomes more complex
Solution Approach 1:
The support structure serves multiple functions simultaneously: it provides mechanical strength, prevents media displacement under air pressure, and maintains the pleated configuration. This multi-functionality reduces the need for additional specialized components, thereby limiting the increase in overall complexity while improving reliability.
3Productivity
If pleating the media is done to increase surface area, then the filtration performance is improved, but the media requires stronger support to prevent blowing out
Solution Approach 1:
The pleated filter combines flexible filtration media with a rigid support structure. The support structure compensates for the reduced stiffness caused by pleating, allowing the media to maintain its pleated configuration and provide increased surface area while preventing media displacement under air pressure.
4Strength
If upstream support is used to prevent media displacement, then the media strength is improved, but the bonding strength of adhesives becomes a problem
Solution Approach 1:
Instead of providing support from the upstream side where adhesive bonding is required, the support structure is positioned on the downstream side. This inversion eliminates the adhesive bonding problem while maintaining media strength and stability under air pressure.
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
This design enhances the structural integrity and filtration efficiency by providing stiffness and flexibility in filter design, enabling customization of filter characteristics and improved performance in HVAC systems and air cleaners.
Implementation Method 1
The lamination process can include cold adhesives or hot melt lamination
Implementation Method 2
thermal welding, ultrasonic welding or any other type of lamination
Data Source
AI summary
A filter media and a pleated filter with a first layer of filtration media, a layer of support material and a second layer of filtration media on the opposite side of the support material as the first layer of filter media. All three layers are laminated together and pleated. The support material provides the required stiffness and rigidity for the pleating process. The physical characteristics of the upstream layer of filtration media are contemplated to be different than the characteristics of the downstream layer of filtration media.