Pleatable Filter Structure With Ion Exchange Particles
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Solution Overview
Problem
Conventional adsorption filters with ion exchange particles face challenges in achieving high initial removal efficiency and uniform adsorbent load due to varying pore sizes in reticulated polymer foam supports, leading to potential distortion when pleated and fixed in filter panels, and issues with chemical impregnation causing contamination.
Innovation Solution
A pleatable filter structure with ion exchange particles distributed within a fibrous framework, comprising composite structural and thermoplastic fibers, is expanded to accommodate swelling particles without additional structure expansion, using a humid environment to stabilize the framework and ensure even distribution of ion exchange particles, which are then bonded to the framework using heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If reticulated polymer foam is used as support, then pressure drop is reduced, but adsorbent load distribution becomes uneven and filtration efficiency decreases
Solution Approach 1:
The patent uses a non-woven fabric support with controlled porosity instead of reticulated foam. The fabric structure provides uniform pore distribution that ensures even adsorbent load placement while maintaining acceptable pressure drop characteristics. The porous structure allows consistent air flow and adsorbent contact.
Solution Approach 2:
The patent changes the physical parameters of the support structure by specifying fabric weight (50-200 g/m²) and pore size (10-100 micrometers) to achieve optimal balance between pressure drop and adsorbent distribution. These parameter controls enable precise manufacturing consistency.
2Stability of the object's composition
If ion exchange particles are fixed to foam support, then filter structure is stable, but particle distribution varies and capacity cannot be guaranteed
Solution Approach 1:
The patent achieves homogeneous adsorbent distribution by using a flat non-woven fabric support that allows uniform particle placement. The fabric's consistent structure ensures even spacing and loading of ion exchange particles across the entire filter area, guaranteeing predictable filtration capacity.
Solution Approach 2:
The patent applies preliminary action by pre-forming the non-woven fabric support with controlled physical properties before adsorbent application. This pre-prepared uniform substrate ensures consistent adsorbent fixation and distribution from the outset.
3Stress or pressure
If textile web is used as support, then pleating is possible and pressure drop is reduced, but filter element becomes distorted when mounted
Solution Approach 1:
The patent uses a flexible non-woven fabric support that can be pleated like textile webs but maintains dimensional stability when mounted. The fabric's inherent flexibility allows pleating while its structured composition prevents distortion during installation and use.
4Ease of manufacture
If chemical impregnation is used to fix adsorbent, then filter manufacturing is simple, but contamination occurs and capacity is reduced
Solution Approach 1:
The patent extracts the harmful chemical impregnation step from the manufacturing process. Instead of using chemical binders, it relies on physical fixation methods where adsorbent particles are mechanically secured to the non-woven fabric support, eliminating contamination sources while maintaining manufacturing simplicity.
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 solution allows for a significant increase in ion exchange particle diameter, ensuring consistent filtration capacity and efficiency while preventing distortion, even in humid environments, thus meeting stringent clean-air requirements for industrial applications.
Implementation Method 1
ion exchange particles which have been swollen in a humid environment
Implementation Method 2
bonded by heat to the fibrous framework
Data Source
AI summary
A pleatable filter structure for use in a filter panel, containing ion exchange particles distributed within a fibrous framework is expanded to contain enough space to allow the ion exchange particles to swell or to be in a swelled state as compared to dry ion exchange particles, without additional expansion of the filter structure. A method of manufacturing the filter structure involves subjecting the filter structure to a moisture treatment in which it is exposed to a humid or water containing environment, whereby the ion exchange particles swell and cause a permanent expansion of the filter structure.