Cellulosic Filter Media With Flame Resistance and Low Pressure Drop
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Solution Overview
Problem
Existing filter media and filters face challenges in achieving high filtration efficiency, pressure drop, flammability, particle holding capacity, and permeability, while also being environmentally friendly and cost-effective.
Innovation Solution
Development of filter media comprising 50% or more cellulosic pulp fiber, a bonding material, and a flame-resistant treatment composition, with a MERV rating of 7 or greater, and filters meeting UL 900 flammability requirements, utilizing bicomponent fibers and liquid binders for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional filter media are used to achieve high filtration efficiency, then particle capture improves, but pressure drop increases
Solution Approach 1:
The filter media utilizes a porous structure formed by cellulosic pulp fibers arranged in a mat configuration, which provides numerous pathways for air flow while capturing particles. The porous nature allows air to pass through with reduced resistance while maintaining filtration efficiency through the interconnected void spaces between fibers.
Solution Approach 2:
The filter media employs localized bonding materials at specific points between fibers rather than uniform bonding throughout, creating regions of varying density. This allows high-filtration areas where fibers are closely spaced while maintaining open flow paths in other regions, thus reducing overall pressure drop.
2Adaptability or versatility
If cellulosic pulp fiber content is increased to improve biodegradability, then environmental friendliness improves, but structural stability deteriorates
Solution Approach 1:
The filter media is constructed as a composite material system where cellulosic pulp fibers form the bulk matrix providing biodegradability, while bonding materials (including bicomponent fibers and liquid binders) are strategically incorporated to provide structural stability. This composite approach allows both environmentally friendly and mechanically stable properties to coexist.
Solution Approach 2:
The bonding materials serve multiple functions simultaneously: they provide structural stability to maintain the filter media integrity, create bonding points for particle capture enhancement, and are themselves designed to be biodegradable or removable, thus serving both structural and environmental compatibility roles.
3Object-affected harmful factors
If flame-resistant treatment composition is applied to meet safety standards, then flammability resistance improves, but manufacturing complexity increases
Solution Approach 1:
The flame-resistant treatment composition is applied during the manufacturing process at an early stage, integrated with the bonding material application or as a separate preprocessing step before final filter assembly. This preliminary application ensures flammability resistance is built into the structure rather than added as a complex post-processing step.
Solution Approach 2:
The flame-resistant treatment composition is combined with the bonding material application process, where the same coating or impregnation step that applies bonding agents also deposits the flame-resistant chemicals. This merging of functions reduces the number of separate manufacturing steps while achieving both bonding and fire resistance.
4Strength
If bicomponent fibers and liquid binders are used to enhance bonding, then filter media strength improves, but manufacturing precision requirements increase
Solution Approach 1:
The manufacturing process utilizes controlled parameter changes including temperature, humidity, and chemical concentration to optimize the bonding between bicomponent fibers and liquid binders. By precisely controlling these parameters, the process achieves uniform bonding without requiring extremely tight tolerances on fiber placement or material application thickness.
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 media and filters achieve improved filtration efficiency, reduced pressure drop, and increased dust-holding capacity, while being biodegradable and recyclable, with a MERV rating of 7 or greater and compliance with flammability standards.
Implementation Method 1
the filter media comprises 50% or more of a cellulosic pulp fiber, by weight of the filter media, a bonding material, and 3% or more of a flame-resistant treatment composition, wherein the filter media has a MERV (ed. 2017) rating of 7 or greater
Implementation Method 2
the bonding material comprises a bicomponent fiber and/or a liquid binder
Data Source
AI summary
Filter media and filters comprising a fibrous material, a bonding material, and a flame-resistant treatment composition are disclosed herein. Methods of making and using the same are also disclosed herein.