Thermally Bonded Filter Medium High Temperature Integrity
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Solution Overview
Problem
Current filtration media fail to maintain filtration efficiency and mechanical integrity at high temperatures, often leading to reduced performance and loss of glass fibers, which can contaminate downstream systems.
Innovation Solution
A thermally bonded filter medium composed of bi-component fibers and staple fibers, excluding glass fibers, which provides improved high-temperature filtration properties, mechanical stability, and versatility, formed through a process involving an aqueous furnish and inclined screen paper making machines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermoplastic resins and thermoplastic bi-component media are used for filtration, then filtration properties are sufficient to remove particulate, but the media softens or fails at high temperatures greater than 100°C
Solution Approach 1:
The patent changes the material composition parameters by replacing thermoplastic resins with thermosetting resins that cure to form a rigid, heat-resistant cross-linked network. This parameter change enables the media to maintain mechanical strength at temperatures above 100°C while preserving filtration capabilities through controlled pore structure in the cured resin matrix.
Solution Approach 2:
The patent creates a composite material system combining inorganic glass fibers with thermosetting resin matrices. This composite structure leverages the high-temperature stability of glass fibers and the heat-curing properties of thermosetting resins to produce a filtration media that resists softening and mechanical failure at elevated temperatures while maintaining particulate removal efficiency.
2Reliability
If glass fiber is used in filtration media, then filtration efficiency is improved, but glass fibers are lost from the web structure and contaminate downstream systems
Solution Approach 1:
The patent introduces thermosetting resin as an intermediary bonding matrix that encapsulates and secures glass fibers within the web structure. The cured resin acts as a mechanical anchor and protective coating, preventing glass fibers from detaching and contaminating downstream systems while maintaining the filtration efficiency provided by the glass fiber network.
Solution Approach 2:
The patent replaces mechanical bonding methods (which allow fiber displacement) with chemical bonding through thermosetting resin curing. The chemical cross-linking creates a rigidified matrix that mechanically locks glass fibers in place, substituting a chemical-physical bonding mechanism for purely mechanical assembly and thereby eliminating fiber shedding.
3Ease of manufacture
If thermoplastic bi-component media are used, then manufacturing is simplified, but the media fails to withstand high temperature heat soak conditions
Solution Approach 1:
The patent changes the thermal processing parameters from thermoplastic melting and bonding to thermosetting curing at elevated temperatures. This parameter change transforms the manufacturing process into one that inherently produces heat-resistant properties, as the curing reaction creates a cross-linked network stable at high temperatures, thereby achieving both manufacturability and heat soak resistance.
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 medium achieves efficient filtration at elevated temperatures, maintains mechanical integrity, and prevents glass fiber contamination, enabling extended filter lifetime and flexibility in engine design.
Implementation Method 1
a thermally bonded web comprising a bi-component fiber with high temperature sheath melting properties
Implementation Method 2
a first bi-component fiber having a core polymer and a sheath polymer with a sheath melting point of about 140° C. to about 160° C.
Data Source
AI summary
A thermally bonded filtration media that can be used in high temperature conditions in the absence of any loss of fiber through thermal effects or mechanical impact on the fiber components is disclosed. The filter media can be manufactured and used in a filter unit or structure, can be placed in a stream of removable fluid, and can remove a particulate load from the mobile stream at an increased temperature range. The combination of bi-component fiber, other filter media fiber, and other filtration additives provides an improved filtration media having unique properties in high temperature, high performance applications.