PAN Fiber Bundle Cross-Sections for Bulkier, Glossier Artificial Hair
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Solution Overview
Problem
Existing acrylic polymer fibers used in artificial hair products lack bulkiness and radiant gloss, and have high stretching loss rates during processing.
Innovation Solution
A polyacrylonitrile-based fiber bundle composed of fibers with specific cross-sectional shapes and dimensions, including C-shape, figure-6-shape, and broad bean-shape with hollow portions, and drop-shape with hollow portions, produced through wet spinning using a C-shaped spinning nozzle and controlled discharge and water-washing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional acrylic polymer fibers are used, then the fiber structure is simple and easy to manufacture, but the bulkiness is poor and the gloss is insufficient
Solution Approach 1:
The fiber cross-section is segmented into multiple distinct shapes (C-shape, figure-6-shape, broad bean-shape with hollow portions, and drop-shapes) rather than using a simple uniform structure. This segmentation creates complex light reflection patterns that produce radiant gloss and improves bulkiness while maintaining manufacturability through controlled spinning processes
Solution Approach 2:
The invention employs asymmetric fiber cross-sectional shapes, particularly the C-shape and figure-6-shape with hollow portions, instead of symmetric circular or oval sections. This asymmetry creates varied light reflection angles and patterns, generating the desired radiant gloss effect and enhancing the perceived bulkiness of the hair ornament product
2Shape
If fibers are crimped and stretched to create natural appearance, then the aesthetic quality improves, but the fiber loss rate increases
Solution Approach 1:
The fiber cross-sectional shapes are predetermined and prepared in advance during the spinning process, with specific flatness ratios and hollow portion configurations. This preliminary shaping allows the fibers to naturally achieve the desired arrangement and light reflection properties without requiring aggressive stretching operations that would cause fiber breakage and loss
Solution Approach 2:
The invention changes the fundamental parameters of the fiber cross-section (flatness ratio, hollow portion size, shape type) to inherently provide the aesthetic qualities normally achieved through post-processing stretching. This parameter change at the manufacturing stage reduces the need for subsequent mechanical manipulation, thereby reducing fiber loss
3Volume of stationary object
If fiber cross-sections have small inscribed circle diameter, then the bulkiness increases, but the radiant gloss decreases
Solution Approach 1:
The invention uses a composite approach by combining multiple fiber types with different cross-sectional shapes (C-shape, figure-6-shape, broad bean-shape, drop-shapes) in a single fiber bundle. This composite structure ensures that some fibers provide bulkiness through smaller inscribed circles while others contribute to radiant gloss through shapes with larger inscribed circles and higher flatness ratios, achieving both properties simultaneously
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 bundle achieves high bulkiness, radiant gloss with varying light reflection, and reduced stretching loss, enhancing the quality of hair ornament products.
Implementation Method 1
performing spinning by extruding a spinning solution containing an acrylonitrile-based polymer through a spinning nozzle having a C-shaped cross-section into a coagulation bath
Implementation Method 2
the water-washing is performed at a temperature of 80° C. or lower
Data Source
AI summary
A polyacrylonitrile-based fiber bundle for artificial hair includes polyacrylonitrile-based synthetic fibers A and polyacrylonitrile-based synthetic fibers B. The polyacrylonitrile-based synthetic fibers A have fiber cross-sections with one or more shapes of a C-shape, a figure-6-shape, and a hollow broad bean-shape. The polyacrylonitrile-based synthetic fibers B have fiber cross-sections with one or more shapes of a hollow drop-shape and a drop-shape. The polyacrylonitrile-based synthetic fibers A have a flatness ratio of less than 1.5. The polyacrylonitrile-based synthetic fibers B have a flatness ratio of 1.5 or more. The C-shape, the figure-6-shape, or the hollow bean-shape of the fiber cross-sections has an inscribed circle with a diameter of 15 to 50 μm. The hollow drop-shape of the fiber cross-sections has an inscribed circle with a diameter of more than 0 μm and less than 15 μm. The fiber cross-sections have a thickness of 13 to 40 μm.