Antimicrobial Filter and Facemask Layers for Wash-Durable Filtration
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Solution Overview
Problem
Conventional antimicrobial and antiviral fabrics and masks lack durable AM/AV properties, especially when subjected to repeated washing or dyeing, and often fail to meet filtration and biocompatibility standards.
Innovation Solution
A filter or mask structure comprising multiple layers, including a first face layer and a second outer layer, with at least one layer containing an AM/AV compound such as zinc, embedded in the polymer structure, achieving synergistic AM/AV efficacy and filtration performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional topical coating treatments with metal compounds are applied to impart antimicrobial properties, then antimicrobial activity is achieved, but the properties are not permanent and deteriorate during repeated washing and use
Solution Approach 1:
The AM/AV compound is incorporated into the polymer composition during the fiber formation process, specifically during melt spinning or extrusion, so that the antimicrobial protection is built into the fiber structure before the fabric is even created. This preliminary incorporation ensures the properties survive subsequent washing and processing
Solution Approach 2:
The invention uses a composite polymer composition that combines a base polymer (such as polypropylene or polyester) with an AM/AV compound (such as zinc oxide, zinc stearate, or other zinc-based compounds). This composite approach allows the fabric to maintain both the mechanical properties of the polymer and the antimicrobial properties of the compound through multiple wash cycles
2Adaptability or versatility
If antimicrobial additives are extracted from fibers during dyeing operations, then fabrics can be dyed in various colors, but the antimicrobial properties deteriorate
Solution Approach 1:
The AM/AV compound is incorporated into the polymer composition during the fiber formation process, specifically during melt spinning or extrusion, so that the antimicrobial protection is built into the fiber structure before the fabric is even created. This preliminary incorporation ensures the properties survive subsequent washing and processing
Solution Approach 2:
The invention specifies particular AM/AV compounds (zinc-based compounds such as zinc oxide, zinc stearate, zinc ricinoleate) that have thermal stability and chemical resistance properties allowing them to withstand dyeing processes without degrading or being extracted, thus maintaining antimicrobial activity after dyeing
3Object-affected harmful factors
If conventional fibers are used to meet sanitation standards with daily washing and bleaching, then fabrics remain sanitary, but the fibers deteriorate and lose antiviral and antimicrobial properties
Solution Approach 1:
The AM/AV compound is incorporated into the polymer composition during the fiber formation process, specifically during melt spinning or extrusion, so that the antimicrobial protection is built into the fiber structure before the fabric is even created. This preliminary incorporation ensures the properties survive subsequent washing and processing
Solution Approach 2:
The invention uses a composite polymer composition that combines a base polymer (such as polypropylene or polyester) with an AM/AV compound (such as zinc oxide, zinc stearate, or other zinc-based compounds). This composite approach allows the fabric to maintain both the mechanical properties of the polymer and the antimicrobial properties of the compound through multiple wash cycles
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 structure demonstrates enhanced Escherichia coli log reduction and particulate filtration efficiency, maintaining AM/AV properties even after washing, while meeting NIOSH and ASTM standards for filtration and breathability.
Implementation Method 1
At least one of the layers further comprises an AM/AV compound, e.g., zinc or a zinc compound... effectively combat pathogens such as bacteria, mold, mildew, virus, spores, and fungus
Implementation Method 2
a filter or mask structure comprising a first face layer... a second outer layer... and a third outer layer... disposed between the first face layer and the second outer layer
Data Source
AI summary
A filter or mask structure, comprising a first face layer comprising a polymer and having a face basis weight, a second outer layer comprising a polymer and having an outer basis weight less than 34 gsm, and a third outer layer comprising a polymer and having a third basis weight and disposed between the first face layer and the second outer layer. At least one of the layers further comprises an AM/AV compound. The mask structure demonstrates an Escherichia coli efficacy log reduction greater than 4.0, as measured in accordance with ASTM E3160 (2018) and a particulate filtration efficiency greater than 90%, as measured in accordance with ASTM F2299-03R17.