Core Sheath Composite Yarn Moisture Absorption
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Solution Overview
Problem
Synthetic polyamide fibers, commonly used in clothing, have insufficient moisture absorption and desorption properties compared to natural fibers, leading to a stuffy or sticky feeling, and existing core sheath composite fibers face issues with durability and color fastness during repeated use.
Innovation Solution
A core sheath composite yarn is developed with a polyether ester amide copolymer as the core and polyamide as the sheath, featuring a specific molecular structure and composition that enhances moisture absorption and desorption performance, wash resistance, and cool feeling by contact, while maintaining color fastness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyamide fibers are used for clothing applications, then strength and chemical resistance are improved, but moisture absorbing properties are insufficient
Solution Approach 1:
The patent employs a core-sheath composite fiber structure where the core portion is made of polyether block amide copolymer (highly moisture absorbent) and the sheath portion is made of nylon-6 resin (providing strength). This composite structure allows the fiber to simultaneously achieve high moisture absorbing properties from the core and high strength from the sheath, resolving the contradiction between these two properties.
2Reliability
If polyether block amide copolymer is used as core portion for moisture absorption, then moisture absorbing properties are improved, but durability deteriorates
Solution Approach 1:
The patent uses a composite fiber structure where the polyether block amide copolymer core provides high moisture absorbing properties while the nylon-6 resin sheath provides durability and mechanical strength. The sheath protects the core material from degradation during repeated use, allowing the fiber to maintain both high moisture absorption performance and durability over time.
3Reliability
If core sheath structure is made with polyether block amide copolymer core and nylon-6 sheath, then moisture absorption is improved, but color fastness deteriorates
Solution Approach 1:
The patent employs a core-sheath structure where the polyether block amide copolymer core provides moisture absorption and the nylon-6 resin sheath provides color fastness. The sheath acts as a protective barrier that prevents dye migration and maintains color stability during washing, while the core maintains its moisture absorbing function.
4Reliability
If hydrophilic compound is added to polyamide fibers to improve moisture absorption, then moisture absorbing properties are improved, but wash resistance deteriorates
Solution Approach 1:
The patent uses an integrated core-sheath composite structure where the polyether block amide copolymer core inherently provides moisture absorption through its molecular structure (ether groups), and the nylon-6 resin sheath provides wash resistance. This structural integration ensures that the moisture absorbing properties are maintained through washing, unlike surface-applied hydrophilic compounds that can detach.
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 core sheath composite yarn achieves high moisture absorption and desorption performance, improved wash resistance, and enhanced comfort with a cool feeling by contact, surpassing natural fibers in practical use while maintaining color fastness and durability.
Implementation Method 1
a core sheath composite yarn having a sheath polymer which is a polyamide and a core which is a polyether ester amide copolymer, having a moisture absorbance/desorbance (ΔMR) of 5.0% or more
Data Source
Figure 1~2
AI summary
A moisture absorbent core sheath composite yarn having a sheath portion polymer that is a polyamide and a core portion that is a thermoplastic polymer, and having a moisture absorbance/desorbance (ΔMR) of 5.0%, wherein the ΔMR maintenance rate after 20 washes is 90%-100%. A core sheath composite fiber having high moisture absorbance, being more comfortable than natural fibers, and having wash resistance with moisture absorbance that stands up to real use and color fastness is provided.