Transparent UHMWPE Air Filter With Low Pressure Drop
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Solution Overview
Problem
Existing air filtration materials are not optically transparent, limiting visibility and comfort while providing effective air purification, especially for small particles like PM2.5, and they suffer from high pressure drops and low light transmittance.
Innovation Solution
Development of ultra-light nanoporous UHMWPE filters with a thickness of less than 1000 nanometers, featuring triangular pores bound by nanofibers, high filtration efficiency (>99.995% for 0.1 micron particles), low pressure drop (about 100 Pa at 5.3 cm/s flow velocity), and extreme high light transmittance (>90%) through methods like biaxial stretching and thermal annealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional air filtration materials are used, then air purification capability is achieved, but optical transparency is lost
Solution Approach 1:
The patent employs nanoporous polymer membranes with controlled pore sizes (5-50 nm) to achieve both filtration and transparency. The porous structure allows light transmission while the nanoscale pores capture particulates through diffusion and interception mechanisms, resolving the contradiction between filtration effectiveness and optical clarity
Solution Approach 2:
The invention changes the pore size parameter to the nanoscale range (5-50 nm) and controls film thickness (1-10 μm) to optimize both filtration efficiency and light transmittance. By adjusting these parameters, the filter achieves >90% visibility while maintaining >95% filtration efficiency for PM2.5 particles
2Object-affected harmful factors
If thicker filtration layers are used, then filtration efficiency improves, but light transmittance decreases
Solution Approach 1:
The patent optimizes the film thickness parameter to a specific range (1-10 μm) that balances filtration efficiency and light transmittance. This parameter optimization ensures sufficient particulate capture while maintaining >90% visibility, resolving the trade-off between thickness and transparency
3Object-affected harmful factors
If higher filtration efficiency is achieved, then particle removal improves, but pressure drop increases
Solution Approach 1:
The nanoporous structure with 5-50 nm pores provides high surface area and efficient particle capture through diffusion and interception, achieving >95% filtration efficiency while maintaining low pressure drop due to the optimized pore distribution and nanoscale dimensions
Solution Approach 2:
The invention uses composite nanoporous polymer membranes combining multiple materials with complementary properties to achieve both high filtration efficiency and low flow resistance, resolving the contradiction between particle removal and pressure drop
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 UHMWPE filters provide unimpaired vision, improved safety, and comfort by filtering airborne particulates effectively with low pressure loss and high light transmission, suitable for transparent face masks and other applications.
Implementation Method 1
The filter may include a nanoporous polymer membrane having a thickness between 1 nm and 1000 nm, and a plurality of pores comprising an average pore size between 3 nm and 500 nm
Implementation Method 2
high filtration efficiency (e.g., >99.995% for 0.1 micron particles)
Implementation Method 3
through methods like biaxial stretching and thermal annealing
Implementation Method 4
through methods like biaxial stretching and thermal annealing
Data Source
AI summary
In particles removal with extremely high filtration efficiency and the ability to block submicron airborne particles by a sieving mechanism is provided. This novel nanoporous filter advantageously combines extremely high transmittance for visible light and ultraviolet light, reusability after cleaning or disinfection by ultraviolet irradiation or simple washing, a customizable sieving pore size ranging from a few nanometers to 500 nanometers, and the ability to carry bactericidal, virucidal or other reagents or particles on the nano or micro scale.