Self-Supported Pleated Filter With Frayed Edges
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Solution Overview
Problem
Self-supporting pleated air filters, commonly used in HVAC systems, face challenges due to their stiff nature, which can make them difficult to insert and secure within frames, and may not provide a strong enough seal, leading to potential leaks.
Innovation Solution
The introduction of frayed edges on the pleated filter medium, which are adhesive-receptive and flexible, allowing easier insertion and positioning within a rectangular frame, and enabling better adhesive penetration and structural rigidity, enhancing the seal between the filter medium and the frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If self-supporting pleated filter medium is used, then the filter medium maintains its pleated form and provides structural support, but it becomes difficult to insert and secure within frames and may not provide a strong enough seal
Solution Approach 1:
The patent applies local quality by creating frayed edges only at specific locations (the edges of the filter medium) while maintaining the self-supporting pleated structure in the bulk of the medium. The frayed edges provide flexibility and adhesive receptiveness locally, while the rest of the medium maintains its structural integrity and pleated form.
Solution Approach 2:
The patent changes the physical parameter of the edges from smooth/cut to frayed, which alters the surface properties to be more adhesive-receptive and flexible. This parameter change at the edges allows easier insertion and securing without compromising the overall structural stability of the pleated medium.
2Strength
If self-supporting pleated filter medium is used, then the filter medium maintains structural rigidity, but it reduces ease of insertion and positioning within frames
Solution Approach 1:
The patent applies local quality by creating frayed edges only at specific locations (the edges of the filter medium) while maintaining the self-supporting pleated structure in the bulk of the medium. The frayed edges provide flexibility and adhesive receptiveness locally, while the rest of the medium maintains its structural integrity and pleated form.
Solution Approach 2:
The patent segments the filter medium into distinct functional zones: the frayed edges provide flexibility and adhesive attachment, while the central pleated body provides structural rigidity. This segmentation allows different parts of the same component to serve different functions simultaneously.
3Ease of manufacture
If conventional smooth edges are used, then the filter medium is easier to manufacture, but adhesive penetration and sealing are insufficient
Solution Approach 1:
The patent changes the physical parameter of the edges from smooth/cut to frayed, which alters the surface properties to be more adhesive-receptive and flexible. This parameter change at the edges allows easier insertion and securing without compromising the overall structural stability of the pleated medium.
Solution Approach 2:
The frayed edges create a porous, fibrous surface structure that allows adhesive to penetrate and bond effectively. The frayed structure acts like a porous material, providing increased surface area and capillary action for adhesive absorption and sealing.
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 frayed edges facilitate easier assembly, improve the structural integrity of the filter, and enhance sealing by allowing adhesive to wick into the edges, creating a more rigid structure and reducing the risk of leaks during air flow.
Implementation Method 1
The frayed edge is more receptive to adhesive and can even act to wick adhesive
Data Source
AI summary
A panel filter is provided such as for HVAC applications in which one of the cut edges is frayed and attached with adhesive to the inner peripheral surface of a paper board frame. The frayed edges may facilitate better gluing of pleated filter medium to the frame especially for self-supported filter media applications and may increase structural rigidity and sealibility as a whole. Frayed edges also provide flexibility to assist in installation of a card of pleated filter medium into a paper board frame.