Modified Cross-Section Hollow Fiber for Thermal Insulation
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Solution Overview
Problem
Existing fibrous assemblies face challenges in ensuring bulkiness, thermal insulation, and sound absorption while maintaining the stability of hollow fibers, as previous technologies either compromise on space between fibers or fail to express complex functions like elasticity and sound absorption effectively.
Innovation Solution
A modified cross-section hollow fiber with a hollow part, shape maintaining part, and volume control parts having specific geometric conditions and a radially deployed spinneret design, which allows for a high hollow ratio and spontaneous crimp, ensuring bulkiness and thermal insulation by maintaining a stable shape and dead air layers between fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a hollow fiber structure is used to increase thermal insulation, then thermal insulation is improved, but the fiber shape stability deteriorates causing the hollow structure to be easily crushed or deformed
Solution Approach 1:
The invention applies local quality by creating different structural zones within the fiber cross-section: a hollow central region for thermal insulation and volume control, and a reinforced outer shell with specific thickness and structural integrity for shape stability. This local differentiation allows the fiber to simultaneously achieve excellent thermal insulation properties and resistance to crushing or deformation.
2Temperature
If the hollow ratio is increased to maximize cooling effect, then thermal insulation is improved, but productivity deteriorates and crimp expression is limited
Solution Approach 1:
The invention optimizes the hollow ratio parameter within a specific range (30-70%) to balance thermal insulation performance with productivity and crimp expression. By precisely controlling this geometric parameter along with spinning conditions, the invention achieves high thermal insulation without sacrificing production efficiency or the ability to create crimped structures for volume and elasticity.
3Temperature
If a modified cross-section with outer slits is used to maintain hollow structure, then thermal insulation is improved, but the outer slits cause adhesion between fibers hindering space formation
Solution Approach 1:
The invention employs asymmetric cross-sectional geometry with strategically positioned and shaped outer slits that prevent fiber-to-fiber contact while maintaining thermal insulation. The asymmetric design ensures that the slits create separation spaces between adjacent fibers in the fibrous assembly, eliminating adhesion problems while preserving the insulating hollow structure.
4Stability of the object's composition
If complex spinning is used to achieve crimp expression, then elasticity and volume are improved, but the hollow ratio improvement is limited
Solution Approach 1:
The invention segments the fiber structure into distinct functional regions: a hollow core for volume and insulation, a structural wall for shape maintenance, and surface features for crimp expression. This segmentation allows each region to be optimized independently, enabling high hollow ratio alongside excellent crimp expression and elasticity without the limitations of conventional complex spinning methods.
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 modified cross-section hollow fiber achieves high thermal insulation, bulkiness, and sound absorption by ensuring a stable shape and dead air layers, while also expressing complex functionalities like elasticity and soundproofing, through its unique volume control elements and crimp structure.
Implementation Method 1
heat insulation is increased by increasing dead air due to the hollow structure
Implementation Method 2
an orientation difference in cross-section can be maximized in the hollow structure in cooling and oriented crystallization processes
Data Source
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AI summary
The present invention provides a modified cross-section hollow fiber, wherein the fiber comprises a hollow part, a shape maintaining part and a volume control part, the volume control part can have a shape protruding in the direction opposite to the center of the fiber, and an end part has a round shape.