Nonwoven Arc Flash Fabric Structure Reducing Basis Weight
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Solution Overview
Problem
Current arc flash protective clothing made from woven materials is heavy and uncomfortable due to its reliance on high basis weights for adequate protection, which negatively impacts breathability, permeability, and comfort, while nonwoven materials lack superior arc flash performance at lower weights.
Innovation Solution
A multiple-use nonwoven fabric structure with inherently fire-resistant fibers, such as FR Viscose, meta-aramid, and para-aramid, and standard fibers like Nylon and Polyester, engineered to achieve superior arc flash performance through optimized fiber orientation and mechanical or chemical bonding, reducing basis weight while maintaining or exceeding protection standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional woven materials are used to achieve adequate arc flash protection, then arc flash performance is improved, but fabric weight increases and comfort deteriorates
Solution Approach 1:
The patent changes the fundamental parameter of fabric construction from woven to nonwoven structure. This parameter change enables achieving the same arc flash protection (ATPV) at significantly lower basis weights, directly resolving the contradiction between protection performance and fabric weight
Solution Approach 2:
The patent uses composite fiber structures within the nonwoven fabric, combining different fiber types and arrangements to achieve optimal balance between arc flash protection and weight reduction. The composite approach allows lighter weight materials to meet protection standards
2Reliability
If fabric weight is increased to improve arc flash protection, then arc flash performance is improved, but breathability and permeability deteriorate
Solution Approach 1:
By changing from woven to nonwoven construction, the patent achieves better breathability at the same protection level. The nonwoven structure allows for optimized fiber arrangement that maintains protection while improving air permeability and wearer comfort
Solution Approach 2:
The nonwoven fabric allows different regions and fiber orientations to be optimized for specific functions - some areas provide arc flash protection while others enhance breathability and comfort, resolving the contradiction between protection and ease of operation
3Weight of moving object
If nonwoven materials are used to reduce fabric weight, then fabric weight decreases and comfort improves, but arc flash performance deteriorates
Solution Approach 1:
The patent successfully changes the nonwoven material parameters (fiber type, orientation, density, bonding) to achieve arc flash performance comparable to or exceeding traditional woven materials at lower weights, directly overcoming the performance limitation of nonwoven fabrics
4Reliability
If traditional woven materials are used to meet arc flash standards, then protection performance is achieved, but manufacturing complexity increases
Solution Approach 1:
By changing to nonwoven construction with optimized fiber parameters, the patent simplifies the overall fabric structure while maintaining protection performance. The nonwoven approach eliminates complex weaving patterns and reduces the number of layers needed, thereby reducing manufacturing complexity
Data Source
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AI summary
The present invention relates to a nonwoven fabric structure for arc flash protection, comprising one or more layers having fire resistant properties, wherein the fabric structure has an arc flash facing nonwoven surface, and a nonwoven part of the fabric structure comprises inherently fire resistant fibers, said fibers being mechanically, chemically, or thermally bonded, whereby the fabric structure has a minimum Arc Thermal Protection Value (ATPV) to fabric basis weight ratio of 250 cal/g, preferably greater than 350 cal/g, more preferably greater than 500 cal/g, when measured in accordance with ASTM F1959 - Standard Test Method for Determining the Arc Rating of Materials for Clothing, and the fabric structure maintains said ATPV to fabric basis weight ratio through at least 25 washing cycles when washed according to AATCC Method 135 (3,IV, A iii), wherein fibers of the nonwoven part of the fabric structure are inherently fire resistant, such as, but not limited to, FR Viscose, meta-aramid, para-aramid, melamine, Polybenzimidazole (PBI), modacrylic fibers, or a combination thereof.