Core-Sheath Conjugated Fiber with Nylon-6 Sheath
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Solution Overview
Problem
Existing core-sheath conjugated fibers face challenges in processing due to exposed moisture-absorbent polymers, prone to detachment and yellowing when interknitted with polyurethane or polyethylene terephthalate, and lack high productivity and comfort in clothing applications.
Innovation Solution
A core-sheath conjugated fiber with a polyether block amide copolymer core and nylon-6 resin sheath, where the core is not exposed, offering a 3/1 to 1/5 area ratio, enhancing moisture absorption, antistatic properties, and cool feeling while preventing post-processing issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the moisture-absorbent polymer is exposed through the surface of the fiber to demonstrate moisture absorption properties, then moisture absorption properties are improved, but the fiber becomes difficult to spin and process
Solution Approach 1:
The invention uses a sheath portion made of nylon 6 resin that completely covers the core portion, creating a protective thin film structure. This sheath protects the exposed moisture-absorbent core while maintaining fiber integrity during spinning and processing, resolving the contradiction between moisture absorption performance and manufacturability
2Reliability
If the core portion is composed of polyether block amide copolymer with nylon 12 hard segment to achieve moisture absorption, then moisture absorption properties are improved, but detachment and yellowing occur in post processes
Solution Approach 1:
The invention changes the chemical composition parameter of the core portion from nylon 12-based polyether block amide copolymer to nylon 6-based polyether block amide copolymer. This parameter change maintains the moisture absorption properties while eliminating the detachment and yellowing issues that occur during post processes with polyurethane or polyethylene terephthalate
3Reliability
If the core/sheath area ratio is increased to enhance moisture absorption, then moisture absorption properties are improved, but fiber strength and processability deteriorate
Solution Approach 1:
The invention optimizes the core/sheath area ratio parameter to fall within 3/1 to 1/5, balancing the moisture absorption capability provided by the core with the structural strength and processability provided by the sheath. This parameter optimization ensures both functional performance and mechanical integrity
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 fiber achieves high productivity, excellent moisture absorption, antistatic properties, and comfort, preventing detachment and yellowing when interknitted with polyurethane or polyethylene terephthalate, suitable for various clothing and textile products.
Implementation Method 1
the core portion is composed of a polyether block amide copolymer... excellent moisture absorption properties
Data Source
AI summary
The present invention provides a conjugated fiber that has excellent moisture-absorption properties, excellent antistatic properties, and excellent cool feeling by contact as well as being less prone to troubles in a post process even in the case where the fiber is interknitted with polyurethane or polyethylene terephthalate. The conjugated fiber is a core-sheath conjugated fiber, including: a core portion; and a sheath portion, wherein the core portion is not exposed through the surface of the core-sheath conjugated fiber, the core portion is composed of a polyether block amide copolymer represented by Formula (1), the polyether block amide copolymer having a hard segment (in the following formula) composed of nylon 6, the sheath portion is composed of a nylon-6 resin, and the area ratio of the core portion to the sheath portion in a transverse section of the core-sheath conjugated fiber is 3/1 to 1/5. [In formula (1), PA represents a polyamide unit (hard segment) ; PE represents a polyether unit (soft segment); and n represents the number of repeating units.]