Lightweight Flame Resistant Fabric Blend for Military Standards
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Solution Overview
Problem
Current flame-resistant fabrics for military and electrical applications often fail to meet performance standards in terms of colorfastness, infrared reflectance, and weight, particularly in hot and humid environments, and do not effectively manage moisture or provide adequate strength.
Innovation Solution
Development of flame-resistant fabrics blended with modacrylic, aliphatic polyamide, and cellulosic fibers, which are printed or dyed to comply with military and electrical standards, incorporating reinforcing yarns to enhance strength and moisture management, and are designed to be lightweight and fast-drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional flame-resistant fabrics are used, then flame resistance is provided, but the fabric weight is excessive and moisture management is poor
Solution Approach 1:
The patent uses a composite fiber blend consisting of modacrylic fibers (30-80%), polyester fibers (10-40%), and spandex fibers (1-20%). This composite material approach allows the fabric to achieve flame resistance through the modacrylic content while the polyester and spandex components provide lightweight properties and moisture management capabilities, thus resolving the contradiction between flame resistance and fabric weight.
2Reliability
If traditional flame-resistant fabrics are used, then flame resistance is provided, but colorfastness and infrared reflectance performance are insufficient
Solution Approach 1:
The patent specifies precise compositional parameters (30-80% modacrylic, 10-40% polyester, 1-20% spandex) and weight parameters (3.5-7.0 ounces per square yard) to optimize both flame resistance and colorfastness performance. By controlling these parameters within specific ranges, the fabric achieves compliance with military standards GL-PD-07-12 and MIL-PRF-EFRCE for colorfastness and infrared reflectance while maintaining flame resistance.
3Weight of moving object
If fabric weight is reduced for comfort in hot environments, then moisture management improves, but strength and durability decrease
Solution Approach 1:
The patent employs a composite fiber system where polyester fibers (10-40%) provide tensile strength and dimensional stability, spandex fibers (1-20%) contribute elasticity and tear resistance, while modacrylic fibers (30-80%) provide flame resistance. This multi-component composite structure enables the lightweight fabric (3.5-7.0 oz/yd²) to maintain adequate strength and durability despite the reduced weight.
4Weight of moving object
If fabric is made lightweight for hot environments, then comfort improves, but protection performance may be compromised
Solution Approach 1:
The patent optimizes the modacrylic fiber content parameter (30-80%) to ensure sufficient flame resistance in the lightweight fabric structure. By maintaining at least 30% modacrylic content, the fabric achieves adequate protection performance against flame and heat while keeping the overall weight between 3.5-7.0 ounces per square yard for comfort in hot environments.
Data Source
AI summary
Flame resistant fabrics comprising a blend of modacrylic, aliphatic polyamide, and cellulosic fibers. Some embodiments are printed and/or dyed with vat dyes so as to comply with the color requirements (including the color, colorfastness, and IR requirements) set forth in the relevant sections of GL-PD-07-12 and/or MIL-PRF-EFRCE. Some embodiments further include reinforcing yarns that improve the strength of the fabrics. Still other embodiments are flame resistant fabrics for use in electrical applications that comply with some or all of the requirements of ASTM F 1506.