Antimicrobial Polymer Foam Air Filter for VOC Removal
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Solution Overview
Problem
Current air filters used in environments like aircraft cabins struggle to effectively kill bacteria and viruses, and fail to efficiently remove volatile organic compounds (VOCs), often requiring frequent replacement and causing uneven airflow due to particulate loading, which increases pressure drop and reduces effectiveness.
Innovation Solution
An air filter comprising a polymer foam with metal particles, such as copper, zinc, or silver, combined with an adsorbent material, which provides antimicrobial properties and adsorptive capabilities, allowing for the killing of bacteria and reduction of VOCs, and can be regenerated, thus extending its lifespan and maintaining airflow efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HEPA filters are used to remove particles, then particle removal efficiency is improved (99.97% of 0.3μm particles), but the filter cannot be cleaned and must be replaced frequently, increasing loss of time and cost
Solution Approach 1:
The patent changes the functional parameters of the filter media by incorporating metal particles (copper, zinc, silver) into the foam structure. These metals provide antimicrobial properties that enable the filter to kill bacteria and viruses rather than just trap them, fundamentally changing the mechanism from physical filtration to active microbial destruction, thereby extending service life
Solution Approach 2:
The patent uses composite materials by combining polymer foam with metal particles and adsorbent materials. This composite structure provides both the mechanical filtration capability of the foam and the antimicrobial/adsorptive properties of the metal and adsorbent components, creating a multi-functional filter that addresses both particle removal and microbial inactivation
2Productivity
If standard air filters are used for recirculation, then airflow is maintained, but they fail to effectively kill bacteria and viruses, reducing reliability
Solution Approach 1:
The filter media performs self-service by incorporating metal particles that actively kill microorganisms through contact. The antimicrobial agents work autonomously without requiring external power or additional systems, providing continuous microbial inactivation as air passes through the filter
Solution Approach 2:
The patent changes the chemical composition parameters by incorporating metal particles with known antimicrobial properties. This compositional change transforms the filter from a passive physical barrier to an active microbial killer, enhancing reliability while maintaining airflow
3Productivity
If filters operate for extended periods, then productivity is maintained, but particulate loading causes uneven airflow and increases pressure drop, reducing efficiency
Solution Approach 1:
The patent uses porous foam materials with controlled pore structures that maintain consistent airflow paths. The porous structure prevents particulate loading from causing uneven airflow distribution and minimizes pressure drop increase over time, allowing extended operation while maintaining efficiency
4Reliability
If adsorbent material is added to remove VOCs, then adsorptive capability is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into a single integrated filter media by combining foam structure, metal particles, and adsorbent materials into one composite component. This eliminates the need for separate filtration stages and simplifies the overall device structure while providing particle filtration, microbial killing, and VOC adsorption simultaneously
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 achieves high microbial removal efficiency (>99.999%) and effective VOC adsorption, reducing bacterial and viral loads while maintaining airflow efficiency and allowing for regeneration, thus addressing the limitations of existing filters.
Implementation Method 1
The metal particles possess antimicrobial, e.g. antibacterial properties
Implementation Method 2
an adsorbent material, which provides antimicrobial properties and adsorptive capabilities, allowing for the killing of bacteria and reduction of VOCs
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3
AI summary
The present invention provides an air filter comprising a polymer foam and an adsorbent material wherein said polymer foam comprises metal particles.