Filter Media With a Fourth Fiber Web for Sterilization-Resistant Bonding
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Solution Overview
Problem
Bonding filter media to filter housings is challenging, especially under conditions of high temperatures and pressures encountered during sterilization processes, leading to potential delamination and compromised structural integrity.
Innovation Solution
Incorporation of a fourth fiber web with specific properties, such as a low melting temperature and mechanical bonding methods like ultrasonic bonding, to facilitate secure attachment of filter media to filter housings without compromising structural integrity or performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bonding methods are used to attach filter media to filter housings, then the bonding process is simple, but the bond fails under high temperature and pressure during sterilization
Solution Approach 1:
An adhesive layer is introduced as an intermediary between the filter media and filter housing. This adhesive layer specifically bonds to both the filter media and the filter housing, creating a reliable bond that withstands high temperature and pressure during sterilization processes while maintaining ease of manufacture through a straightforward application process.
2Reliability
If filter media is made thinner to reduce pressure drop, then filtration efficiency improves, but mechanical strength decreases making bonding difficult
Solution Approach 1:
The filter media is constructed as a composite structure combining a non-woven fabric layer with a hydrophilic fiber web layer. The non-woven fabric provides mechanical strength and structural integrity, while the hydrophilic fiber web provides filtration performance with low pressure drop. This composite approach allows the filter media to maintain both thinness for filtration efficiency and sufficient mechanical strength for handling and bonding.
3Strength
If adhesive layers are used to bond filter media to housing, then bonding strength improves, but the adhesive may compromise filtration performance
Solution Approach 1:
The adhesive layer is applied locally only at the bonding interface between the filter media and filter housing, rather than throughout the entire filter media. This localized application ensures strong bonding where needed while maintaining the filtration performance of the bulk filter media. The adhesive layer is positioned specifically at the interface where bonding is required, leaving the filtration layers unaffected.
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 fourth fiber web enhances adhesion to filter housings, maintaining structural integrity through sterilization processes and ensuring consistent filtration performance with reduced pressure drop and increased effective filter area.
Implementation Method 1
mechanical bonding methods like ultrasonic bonding
Implementation Method 2
second, hydrophilic fiber web directly adjacent to the first fiber web
Data Source
AI summary
Filter media may be bonded to a filter housing during filtration processes. However, bonding between the filter media and filter housing sufficient to prevent delamination during filtration processes may be challenging as some filter media may be challenging to adhere sufficiently well to the filter housing. Furthermore, for use in consumer water applications, it may be desirable for filter media may undergo sterilization processes (e.g., using an autoclave) that expose the filter media to relatively high temperatures and pressures, which may decrease the adhesion strength between the filter media and the filter housing. Accordingly, there is a need for strategies for bonding filter media to filter housings that do not compromise the performance of the filter media and/or that can undergo sterilization processes without unacceptably compromising the structural integrity of the bond between the filter media and the filter housing.