High Moisture Regain Yarn Blend for Arc Protection
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Solution Overview
Problem
Existing arc and flame protective fabrics provide superior protection but often have lower moisture regain, leading to discomfort and potentially reduced wearability, which can compromise safety if workers forego protective apparel due to discomfort.
Innovation Solution
A yarn blend comprising 10 to 40 weight percent meta-aramid fiber with a degree of crystallinity of at least 20%, 20 to 60 weight percent modacrylic fiber, 15 to 45 weight percent FR rayon fiber, and 5 to 20 weight percent para-aramid fiber, which maintains high arc protection while enhancing moisture regain and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high content of modacrylic and aramid fibers is used for arc protection, then arc protection performance is improved, but moisture regain decreases leading to discomfort
Solution Approach 1:
The patent applies composite materials by blending modacrylic fiber, aramid fiber, and FR rayon fiber in specific proportions. The modacrylic and aramid fibers provide arc protection, while the FR rayon fiber contributes high moisture regain properties. This composite approach allows the fabric to simultaneously achieve superior arc protection performance and improved comfort through enhanced moisture management.
2Ease of operation
If high proportion of flammable fiber is used to improve comfort, then moisture regain increases, but arc protection performance deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the proportion of FR rayon fiber within 15 to 45 weight percent of the total blend. This parameter optimization ensures that the fabric achieves sufficient moisture regain for comfort while the remaining modacrylic and aramid fibers maintain adequate arc protection performance. The specific range prevents excessive flammable content while maximizing comfort benefits.
3Ease of operation
If amorphous meta-aramid fiber is used to improve comfort, then moisture regain increases, but arc protection performance decreases
Solution Approach 1:
The patent applies parameter changes by specifying that the meta-aramid fiber must have a degree of crystallinity of at least 20%. This crystallinity parameter ensures the fiber maintains the structural integrity and arc protection performance necessary for protective apparel, while still providing acceptable moisture regain properties for wearer comfort.
Data Source
AI summary
This invention relates to a yarn having high moisture regain for use in arc and flame protection and fabrics and garments containing the yarn. The yarn has a blend of fibers which includes 10 to 40 weight percent meta-aramid fiber having a degree of crystallinity of at least 20%, 20 to 60 weight percent modacrylic fiber, 15 to 45 weight percent FR rayon fiber, and (d) 5 to 20 weight percent para-aramid fiber; based on the total weight of these components. If desired, 1 to 3 weight percent of the para-aramid fiber in the yarn can be replaced with an antistatic fiber as long as at least 5 weight percent para-aramid fiber is present.