Inner Lining Fabric Yarn Ratio for Dimensional Stability
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Solution Overview
Problem
Existing protective garments, such as firefighter garments, often have unbalanced properties in the warp and fill directions, leading to dimensional instability and reduced performance after laundering, particularly in lightweight fabrics.
Innovation Solution
A woven inner lining fabric constructed with a ratio of filament yarns to spun yarns greater than 1:1 to 5:1 in both warp and fill directions, using inherently flame-resistant materials like aramid polymers and treated cellulose fibers, ensuring balanced strength and shrinkage characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If prior inner lining fabrics are used, then flame resistance is provided, but unbalanced shrinkage characteristics cause dimensional instability after laundering
Solution Approach 1:
The patent applies parameter changes by carefully controlling the ratio of filament yarns to spun yarns (greater than 1:1 to 5:1) in both warp and fill directions, and adjusting fabric weight (2-6 osy) to achieve balanced shrinkage characteristics while maintaining flame resistance. This quantitative adjustment of material parameters resolves the contradiction between flame resistance and dimensional stability.
Solution Approach 2:
The patent uses composite materials by combining filament yarns and spun yarns in a woven fabric structure. This composite construction allows the fabric to simultaneously achieve flame resistance (from the material composition) and balanced dimensional stability (from the engineered yarn ratio and weave structure), resolving the technical contradiction.
2Weight of moving object
If lightweight fabric is used for inner lining, then comfort and ease of wear is improved, but unbalanced properties cause loss of dimensional stability after laundering
Solution Approach 1:
The patent addresses this contradiction by changing the parameter of yarn composition ratio (filament to spun yarn ratio greater than 1:1 to 5:1) and fabric weight (2-6 osy) to achieve lightweight fabric that maintains balanced dimensional stability. The specific parameter adjustments ensure lightweight comfort without sacrificing dimensional stability after laundering.
3Ease of operation
If high lubricity characteristics are achieved, then ease of donning and comfort during movement is improved, but fabric construction complexity increases
Solution Approach 1:
The patent achieves high lubricity by changing the parameter of yarn type composition (using predominantly filament yarns in a greater than 1:1 to 5:1 ratio compared to spun yarns). This parameter change provides low friction and high lubricity characteristics that improve ease of donning and comfort during movement, while the systematic approach keeps construction manageable.
Data Source
AI summary
Protective garments are disclosed having an inner lining with high lubricity and high strength characteristics. The inner lining, in one embodiment, contains spun yarns combined with multifilament yarns. In accordance with the present disclosure, the multifilament yarns are present in the warp direction and in the fill direction. In addition, the multifilament yarns may outnumber the spun yarns in both the warp direction and the fill direction. In this manner, a fabric is produced not only having good lubricity characteristics but also having a balance of properties. For instance, in one embodiment, the shrink properties of the fabric in the warp direction substantially match the shrink properties of the fabric in the fill direction.