Porous Filter Laminate for Low Pressure Drop
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Solution Overview
Problem
Porous filters face a trade-off between improving fine particle retention performance and reducing filtration cost, as decreasing pore size to enhance retention leads to increased pressure drop, making it difficult to achieve both effectively.
Innovation Solution
A porous filter with a laminate structure composed of biaxially stretched PTFE sheets, where the Gurley number and bubble point satisfy specific expressions to maintain low pressure drop while achieving high retention performance, allowing for cost-effective production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the pore size is decreased to improve fine particle retention performance, then the retention performance is improved, but the pressure drop increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the Gurley number and bubble point parameters of the porous laminate to satisfy specific mathematical relationships (log G > 3.7×10^-3×B - 0.8 and log G < 4.9×10^-3×B + 0.45). This allows optimization of pore structure to achieve high retention performance while maintaining low pressure drop, resolving the contradiction between retention and energy consumption
Solution Approach 2:
The patent uses composite materials by stacking multiple biaxially stretched porous PTFE sheets to form a laminate structure. This composite approach enables the filter to achieve both fine particle retention and low pressure drop characteristics that cannot be obtained with single-layer structures, effectively resolving the technical contradiction
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 enables both improved fine particle retention and reduced filtration cost by controlling the Gurley number and bubble point, ensuring the filter can be used effectively in microfiltration applications while maintaining mechanical strength and low production costs.
Implementation Method 1
a porous filter in which a porous sheet made of PTFE capable of retaining fine particles with a particle diameter of less than 0.1 μm is used
Implementation Method 2
The Gurley number G and the bubble point B (kPa) of the porous laminate satisfy the following expressions (1) and (2)
Data Source
AI summary
A porous filter includes a porous laminate in which a plurality of biaxially stretched porous sheets made of PTFE are stacked. The Gurley number G and the bubble point B (kPa) of the porous laminate satisfy the following expressions (1) and (2):log G>3.7×10−3×B−0.8 (1)log G<4.9×10−3×B+0.45 (2).