Self-supporting Pleatable Fibrous Web for Oil Filter Media
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Solution Overview
Problem
Conventional oil filters with wood pulp fibers lack mechanical strength and durability when exposed to high temperatures and chemical stresses in combustion engines, requiring additional support structures and failing to maintain pleat shape over time.
Innovation Solution
A fibrous filtration media composed of synthetic fibers and a thermoset binder, with thermoplastic microfibers and staple fibers, forming a self-supporting pleated structure that retains pleats at engine temperatures, enhancing mechanical and thermal durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If wood pulp fibers are used for filtration media, then cost is reduced and processability is improved, but mechanical strength and durability at high temperatures deteriorate
Solution Approach 1:
The patent uses a composite fiber system combining wood pulp fibers (55-70 wt%) with synthetic fibers (30-45 wt%, specifically polyester and polypropylene) to achieve both mechanical strength and processability. The synthetic fibers provide thermal stability and strength at high temperatures while the wood pulp fibers maintain cost-effectiveness and processability, resolving the contradiction between strength and ease of manufacture
2Reliability
If wood pulp filtration media is used, then cost is reduced, but burst strength and durability under thermal and chemical stress deteriorate
Solution Approach 1:
The patent creates a composite nonwoven fabric with 55-70 wt% wood pulp fibers and 30-45 wt% synthetic fibers (polyester and polypropylene). This composition achieves high reliability with burst strength ≥2.5 atm at 135°C and excellent chemical resistance to engine oil, while maintaining cost-effectiveness by using primarily natural wood pulp fibers that are readily available and inexpensive
3Area of stationary object
If filtration media is pleated to increase surface area, then filtration efficiency is improved, but mechanical strength and pleat retention deteriorate without support structures
Solution Approach 1:
The composite nonwoven fabric with synthetic fiber reinforcement (30-45 wt% polyester and polypropylene) provides inherent mechanical strength that enables the media to be pleated into corrugated structures with high surface area while self-retaining the pleat shape without requiring additional metal mesh or support structures. The synthetic fibers act as a structural reinforcement within the composite
4Strength
If synthetic fiber content is increased to improve strength, then mechanical and thermal durability is improved, but pleatability and self-supporting structure deteriorate
Solution Approach 1:
The patent optimizes the fiber composition parameters by limiting synthetic fibers to 30-45 wt% (with polyester at 15-30 wt% and polypropylene at 15-30 wt%) and wood pulp fibers at 55-70 wt%. This specific parameter range achieves the optimal balance where synthetic fibers provide sufficient mechanical strength and thermal stability while wood pulp fibers maintain pleatability and flexibility, enabling self-supporting pleated structures
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 media achieves increased burst strength and durability, maintaining pleat shape and functionality at high temperatures, eliminating the need for additional support structures and extending filter lifespan.
Implementation Method 1
a nonwoven fibrous web comprising synthetic fibers and at least about 15 wt.%, based on total weight of the fibrous web, of a binder component selected from the group consisting of a thermoset binder resin and binder fibers. The synthetic fibers are bonded together with the binder component to form the fibrous web
Implementation Method 2
The synthetic fibers of the fibrous web will comprise from about 2 wt.% to about 65 wt.%, for example between about 10 wt.% to about 50 wt.%, based on total weight of fibers in the fibrous web, of thermoplastic synthetic microfibers having an average diameter of less than 5 μm and from about 10 wt.% to about 65 wt.%, based on the total weight of fibers in the fibrous media of thermoplastic staple fibers having an average diameter of greater than 5.0 μm
Data Source
Figure 1
AI summary
Fibrous filtration media for hot oil filtration includes a nonwoven fibrous web containing synthetic fibers and at least about 15 wt.%, based on total weight of the fibrous web, of a binder component selected from thermoset binder resins and/or binder fibers. The synthetic fibers of the fibrous web will contain from about 2 wt.% to about 65 wt.%, for example between about 10 wt.% to about 50 wt.%, based on total weight of fibers in the fibrous web, of thermoplastic synthetic microfibers having an average diameter of less than 5 μιτι. The synthetic fibers are bonded together with the binder component to form the fibrous web which is capable of forming a self-supporting, pleated oil filter media which retains pleats upon contact with oil having a temperature in a range encountered in an internal combustion engine.