Composite Yarn for Protective Garments
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Solution Overview
Problem
Existing technical yarns for protective garments lack sufficient resistance to blade-shearing and abrasion, machinability, and comfort, while also having high hairiness issues.
Innovation Solution
The development of yarns with a core of continuous filaments like glass, steel, or ceramic, wrapped in multiple layers with specific winding directions and densities, incorporating discontinuous fibres to create an open-coiling structure that locks fibres in place, reducing hairiness and enhancing mechanical resistance and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional technical yarns are used for protective garments, then mechanical resistance is provided, but resistance to blade-shearing and abrasion is insufficient
Solution Approach 1:
The yarn combines multiple materials with different properties: a core of continuous filaments (glass, steel, or ceramic) for structural strength, wrapped in layers of synthetic fibres (polyester, polyamide, elastane) for flexibility and comfort. This composite structure integrates the cutting resistance of metal/ceramic filaments with the durability and comfort of textile fibres, achieving both blade-shearing resistance and wear resistance simultaneously
Solution Approach 2:
The yarn structure follows a nested configuration where the continuous filament core is embedded within multiple wrapping layers. The first layer of discontinuous fibres is wound around the core, followed by a second layer in the opposite direction, creating a concentric nested structure that protects the core while distributing mechanical stresses across multiple material interfaces
2Strength
If yarns with high mechanical resistance are used, then protection is improved, but machinability in weaving deteriorates
Solution Approach 1:
The invention optimizes several parameters: the wrapping density (number of turns per unit length), the tension applied during wrapping, and the fibre diameter distribution. These parameter adjustments ensure the yarn has consistent thickness and flexibility, making it suitable for standard weaving machinery while maintaining high mechanical resistance through the reinforced core structure
3Ease of operation
If traditional yarn structures are used, then coverage is provided, but hairiness increases and comfort deteriorates
Solution Approach 1:
The continuous filament core is prepared in advance to serve as a stable backbone that prevents fibre protrusion. The wrapping layers are applied with controlled tension and density before the yarn is put into service, creating a compact structure that locks fibres in place and prevents hairiness from developing during wear and processing
Data Source
AI summary
Yarns are provided which may include a core having a continuous filament, a first covering of said filament, obtained by winding a first yarn in a first winding direction, a second covering superposed over the first covering, made by winding a second yarn in an opposite winding direction, so as to form an open-coiling cover, at least one third covering, obtained by winding at least one sliver having discontinuous fibers in the same winding direction as the second yarn, positioning the fibers at least in the interspaces of said open-coiling cover. Durable and comfortable textiles and garments made from such yarn and methods of making same are also provided.