High Temperature Filter Media Structural Integrity
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Solution Overview
Problem
Conventional high temperature filtration media require expensive and complex resin treatments to maintain structural integrity, leading to pleat collapse and reduced functionality during high pressure, high temperature processes due to incomplete curing and re-stiffening issues.
Innovation Solution
A nonwoven filter medium composed of polymeric fibers with a base polymer and a secondary polymer, where the polymers bond to create a stable structure capable of retaining stiffness at temperatures above 135°C, using a method involving compression and thermal densification to ensure structural integrity and chemical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional polymer filter media are used at high temperatures, then the filter media can be used for filtration, but the media becomes soft and loses pleat definition due to low glass transition temperature
Solution Approach 1:
The patent combines PPS fibers with a thermally stable polymer matrix (such as polyimide or polyamide-imide) to create a composite filter media. The PPS fibers provide filtration functionality while the thermally stable matrix maintains structural integrity and pleat definition at temperatures above 90°C, resolving the contradiction between high temperature operation and structural stability.
2Stability of the object's composition
If stiffening resin is impregnated into filter media to strengthen and stabilize the filter, then the filter media can retain form at elevated temperatures, but the resin is not fully cross-linked initially and the media re-softens during high pressure, high temperature processes
Solution Approach 1:
The patent changes the chemical composition parameters of the filter media by selecting polymers with inherently high glass transition temperatures (such as polyimide with Tg > 200°C or polyamide-imide with Tg > 250°C). This eliminates the need for post-curing processes and ensures the media maintains structural stability and functional reliability throughout the entire service life at operating temperatures up to 200°C.
3Area of moving object
If pleated filter media are used to increase effective filtering area, then the filtering area increases, but the amount of stiffening resin required increases proportionally, making the cost prohibitive
Solution Approach 1:
The patent applies local quality by using PPS fibers specifically in regions requiring filtration functionality while employing the thermally stable polymer matrix in regions requiring structural support. This localized material distribution maintains pleat definition and structural integrity throughout the entire filter media, including pleated sections, without requiring excessive amounts of expensive stiffening resin.
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 filter medium maintains structural integrity and chemical resistance at high temperatures, preventing pleat collapse and ensuring functional performance during extended high-temperature exposure.
Implementation Method 1
heating the nonwoven fabric substrate to a bonding temperature to melt at least a portion of the base polymer, at least a portion of the secondary polymer, or both
Implementation Method 2
compressing the nonwoven fabric substrate so as to impart a second density to the nonwoven fabric substrate greater than the first density
Data Source
AI summary
A high temperature filter medium for use in a filtering operation comprising, a nonwoven fabric substrate having a physical structure and comprising a plurality of polymeric fibers, wherein at least a portion of the plurality of polymeric fibers comprise a base polymer and at least a portion of the plurality of polymeric fibers comprise a secondary polymer, and wherein the base polymer, the secondary polymer, or both bond at least a portion of the polymeric fibers together, the nonwoven fabric substrate being capable of retaining the physical structure at a filtering temperature greater than 135° C. A method for making a filter medium being capable of retaining the physical structure at a filtering temperature greater than 135° C.