Chitosan-Crosslinked Yarn Reinforcement for Wash-Durable Weaving
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Solution Overview
Problem
Thin yarns made from natural animal fibers, vegetable fibers, synthetic polymer fibers, and man-made natural fibers face challenges such as breakage during spinning and weaving due to their thinness, and they lack mechanical properties like abrasion resistance and dye affinity, while existing methods using chitosan provide temporary effects that fade after washing.
Innovation Solution
A process involving the application of a chitosan-based reinforcement product to fibers before spinning, followed by crosslinking to create a permanently anchored polymer that enhances mechanical properties and dye affinity, with optional partial removal to maintain softness and prevent structural stiffening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thin yarns are made from natural animal fibers, vegetable fibers, synthetic polymer fibers, and/or man-made natural fibers, then the yarns are prone to breaking during spinning and weaving, but increasing the yarn thickness would compromise the desired thinness and fabric quality
Solution Approach 1:
The patent applies composite materials by combining chitosan polymer with the fiber yarns to create a reinforced composite structure. The chitosan forms a coating layer on the fiber surface, creating a composite material that enhances mechanical strength and breaking resistance while preserving the original thin dimensions of the yarn. This is achieved through the application of chitosan composition (0.5-10% w/v) to the fibers before spinning, forming a protective reinforcement layer.
Solution Approach 2:
The patent employs parameter changes by modifying the physical and chemical properties of the fiber surface through chitosan treatment. The chitosan coating alters surface parameters such as friction coefficient, mechanical strength, and dye affinity, enabling thin yarns to achieve enhanced breaking resistance without increasing thickness. The crosslinking process further modifies these parameters to ensure permanent anchoring of the reinforcement.
2Strength
If chitosan is applied to fibers before spinning to enhance mechanical properties, then abrasion resistance improves, but the chitosan effect is temporary and fades after washing
Solution Approach 1:
The patent utilizes oxidation as a crosslinking mechanism to permanently anchor chitosan to the fiber surface. The chitosan polymer contains hydroxyl and amino groups that can form crosslinked networks through oxidation reactions, creating strong covalent bonds between the chitosan coating and the fiber substrate. This crosslinked structure ensures that the reinforcement effect persists through repeated washing and mechanical stress, transforming the temporary effect into a permanent one.
Solution Approach 2:
The patent replaces mechanical adhesion (physical coating) with chemical bonding (crosslinking) to achieve permanent anchoring of chitosan. Instead of relying on mechanical attachment that can be removed by washing, the chitosan is chemically crosslinked to the fiber surface through oxidation reactions, substituting the mechanical system with a chemical bonding system that provides durable, wash-resistant reinforcement.
3Strength
If chitosan reinforcement product is applied to fibers, then mechanical properties and dye affinity improve, but the yarn structure becomes stiffened
Solution Approach 1:
The patent applies local quality by concentrating the chitosan reinforcement at the fiber surface level rather than throughout the entire yarn structure. The chitosan coating is applied as a thin layer (0.5-10% w/v composition) on the outer surface of the fibers, providing localized reinforcement for mechanical strength and dye affinity while leaving the inner core of the yarn structure unchanged and soft. This surface-localized treatment ensures that only the necessary outer layer is stiffened for reinforcement, while the bulk remains soft and flexible.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The process results in yarns with improved mechanical resistance, durability against repeated washing, and enhanced dye affinity, while maintaining softness and preventing structural stiffening, thus addressing the limitations of existing methods.
Implementation Method 1
a subsequent step of crosslinking of the chitosan and/or derivatives thereof of said reinforcement product applied to said fibers and/or to said filaments, such that a crosslinked reinforcement polymer permanently anchored to said fibers and/or to said filaments is obtained
Implementation Method 2
a crosslinked reinforcement polymer permanently anchored to said fibers and/or to said filaments
Data Source
AI summary
A process of making a yarn includes, before the weaving step, application of chitosan to the fibers and/or filaments of said yarn, and subsequent crosslinking thereof.