Regenerable PTFE Air Filter Medium With Stable Pressure Loss
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Solution Overview
Problem
Existing air filters, particularly those using PTFE porous membranes, face challenges in maintaining collection efficiency and permeability while minimizing pressure loss, especially when exposed to moisture or disinfection treatments, leading to decreased performance.
Innovation Solution
An air filter medium comprising a fluororesin porous membrane and a supporting member, designed with specific permeability and pressure loss ratios, allowing for reuse after disinfection treatments without significant performance degradation, and incorporating a fluororesin with a fibrillatable PTFE structure to enhance dust-holding capacity and maintain efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PTFE porous membrane is used as an air filter medium, then collection efficiency is improved, but permeability decreases and pressure loss increases after disinfection treatment
Solution Approach 1:
The patent applies parameter changes by controlling the contact angle of the fluororesin porous membrane to be 25° or less before disinfection treatment. This specific parameter control allows the membrane to maintain both high collection efficiency and high permeability after disinfection, as the low contact angle prevents excessive moisture retention that would otherwise block pores and reduce permeability.
Solution Approach 2:
The patent utilizes porous materials by employing a fluororesin porous membrane with specifically controlled pore structure and surface properties. The porous structure enables both filtration function and breathability, while the fluororesin material provides moisture resistance and ease of disinfection, resolving the contradiction between collection efficiency and permeability maintenance.
2Reliability
If a PTFE porous membrane is used as an air filter medium, then collection efficiency is improved, but pressure loss increases after disinfection treatment
Solution Approach 1:
The patent applies parameter changes by controlling the contact angle of the fluororesin porous membrane to be 25° or less before disinfection treatment. This specific parameter control allows the membrane to maintain both high collection efficiency and high permeability after disinfection, as the low contact angle prevents excessive moisture retention that would otherwise block pores and reduce permeability.
Solution Approach 2:
The patent converts the potential harm of moisture retention into a benefit by using fluororesin material with low surface energy. The material's inherent moisture-repellent properties prevent water from blocking pores, so even when exposed to moisture during disinfection, the membrane maintains open pores and low pressure loss, turning a potential problem into an advantage.
3Object-affected harmful factors
If the fluororesin porous membrane is subjected to disinfection treatment, then viral and bacterial removal is improved, but permeability decreases significantly
Solution Approach 1:
The patent applies parameter changes by controlling the contact angle of the fluororesin porous membrane to be 25° or less before disinfection treatment. This specific parameter control allows the membrane to maintain both high collection efficiency and high permeability after disinfection, as the low contact angle prevents excessive moisture retention that would otherwise block pores and reduce permeability.
Solution Approach 2:
The patent enables the air filter medium to be easily disinfected and potentially reused by making the fluororesin porous membrane inherently resistant to moisture and chemical disinfectants. The material's stability allows it to withstand disinfection treatments without degrading, unlike more delicate filtration materials that would require replacement rather than reuse.
4Object-affected harmful factors
If the fluororesin porous membrane is subjected to disinfection treatment, then viral and bacterial removal is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by controlling the contact angle of the fluororesin porous membrane to be 25° or less before disinfection treatment. This specific parameter control allows the membrane to maintain both high collection efficiency and high permeability after disinfection, as the low contact angle prevents excessive moisture retention that would otherwise block pores and reduce permeability.
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 air filter medium maintains high collection efficiency and permeability, with minimal pressure loss and ease of disinfection, ensuring effective filtration even after exposure to moisture or disinfection treatments, while supporting reuse and reducing breathing difficulty.
Implementation Method 1
an air filter medium including a fluororesin porous membrane and a supporting member which are stacked on top of each other
Implementation Method 2
incorporating a fluororesin with a fibrillatable PTFE structure to enhance dust-holding capacity
Data Source
AI summary
An air filter medium includes a fluororesin porous membrane and a supporting member stacked on top of each other. The air filter medium has a permeability ratio (permeability after disinfection treatment/permeability before disinfection treatment) of 5.0 or less, the permeability ratio being a ratio of permeabilities of the air filter media before and after the disinfection treatment of the fluororesin porous membrane as determined using NaCl particles having a particle size of 0.1 μm, and a pressure loss ratio (pressure loss after disinfection treatment/pressure loss before disinfection treatment) of 0.83 or more and 1.15 or less, the pressure loss ratio being a ratio of pressure losses of the air filter media before and after the disinfection treatment of the fluororesin porous membrane.