Bicomponent Spandex Fiber Heat-Resistant Core Fusible Sheath
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Solution Overview
Problem
Existing elastomeric fibers used in nylon fabrics suffer from poor heat resistance and fusibility with nylon fibers, leading to loss of recovery power and seam slippage issues during heat treatment, which is necessary for dimensional stability and uniform appearance in apparel textiles.
Innovation Solution
Development of a bicomponent spandex fiber with a heat-resistant polyurethaneurea core and a heat-sensitive polyamide hot melt adhesive sheath, allowing for bonding with nylon fibers without excessive loss of recovery power, using a sheath-core configuration and specific composition ratios to ensure adequate fusibility and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If low melting point polyurethane elastomeric fibers are used to achieve fusibility with nylon fibers, then bonding between fibers is improved, but heat resistance and recovery power are lost
Solution Approach 1:
The spandex fiber is divided into two distinct components: a heat-resistant core (segment) that maintains structural integrity at high temperatures, and a heat-sensitive sheath (segment) that melts at lower temperatures to provide bonding. This segmentation allows each part to fulfill its specific function without compromising the other.
Solution Approach 2:
The invention creates a composite fiber structure combining materials with different thermal properties - a polyurethaneurea core (melting point ≥250°C) and a polyamide sheath (melting point ≤180°C). This composite approach enables the fiber to exhibit both heat resistance (from the core) and fusibility (from the sheath) simultaneously.
2Manufacturing precision
If heat treatment at high temperature is applied to achieve dimensional stability of nylon fabric, then fabric appearance is improved, but elastomeric fiber tenacity and recovery power are lost
Solution Approach 1:
By segmenting the fiber into heat-resistant core and heat-sensitive sheath, the core protects the fiber's structural integrity during high-temperature heat treatment, preventing tenacity loss while the sheath provides necessary bonding.
Solution Approach 2:
The invention changes the thermal parameters of the fiber by incorporating a core material (polyurethaneurea) with melting point ≥250°C, which remains stable during typical nylon heat treatment temperatures (190-200°C), thereby maintaining fiber strength and recovery power during the heat treatment process.
3Strength
If heat treatment temperature is reduced to preserve elastomeric fiber properties, then recovery power is maintained, but fusibility with nylon fibers is insufficient
Solution Approach 1:
The invention modifies the thermal parameters by creating a bimodal melting point structure: the sheath component has melting point ≤180°C enabling fusibility at lower temperatures that preserve recovery power, while the core component (melting point ≥250°C) ensures structural stability.
Solution Approach 2:
By using composite materials with different melting points, the fiber achieves fusibility through the low-melting sheath material while the high-melting core material maintains the fiber's mechanical properties and recovery power during the bonding process.
4Adaptability or versatility
If conventional spandex fibers are used in nylon fabric, then elasticity is provided, but seam slippage occurs during repeated stretching
Solution Approach 1:
The heat-sensitive sheath component is designed to melt and bond the spandex fiber to nylon fibers during fabric construction or heat treatment, creating preliminary bonds that prevent seam slippage during subsequent repeated stretching and wearing.
Solution Approach 2:
The composite fiber structure with heat-sensitive sheath material enables the spandex to bond with nylon fibers, creating a more stable seam structure that resists slippage while maintaining the elastic properties provided by the spandex core.
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 bicomponent spandex fiber maintains fabric elasticity and prevents seam slippage by effectively bonding with nylon fibers during heat treatment, enhancing fabric power and appearance while maintaining stretch and recovery properties.
Implementation Method 1
the sheath component includes at least one polyamide based hot melt adhesive with the melting temperature no higher than 180° C.
Implementation Method 2
Nylon fabrics containing such spandex fibers have enhanced stretch performance and improved surface appearance after heat treatment to activate the fusing and bonding between nylon fibers and spandex fibers.
Data Source
AI summary
Included are segmented polyurethane elastic fibers or spandex fibers, capable of bonding to polymer fiber such as nylon or polyamide fibers, in addition to bonding to itself, for apparel textile applications. More particularly the invention relates to bicomponent spandex fibers, with a heat resistant core and a heat sensitive sheath, spun from polymer solutions. The nylon fabrics containing such spandex fibers have enhanced stretch performance and improved surface appearance after heat treatment to activate the fusing and bonding between nylon fibers and spandex fibers.