Glossy Fiber Multilayer Structure for Metallic Appearance
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Solution Overview
Problem
Current synthetic fibers fail to achieve a deep lustrous gloss similar to natural metals and are limited in softness and processing flexibility for garment applications due to issues like metal film cracking and interlaminar separation in multilayer structures.
Innovation Solution
A glossy fiber with a cross-section featuring a multilayer region of concentrically superposed polymers, light-absorbing particles, and air voids, optimized for high average reflectance, low average transmittance, and low contrast gloss, allowing for efficient processing into woven or knit fabrics with enhanced softness and aesthetic appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a metal is vapor-deposited on a fiber to impart a deep lustrous gloss, then the gloss is improved, but the thin metal film may crack due to friction from fiber processing or laundering, resulting in loss of the gloss
Solution Approach 1:
The patent creates a structural copy of the multilayer architecture found in natural metallic materials (like butterfly wings and beetle exoskeletons) to achieve metallic gloss without using actual metal coatings. This structural coloring approach produces the desired optical properties while avoiding the mechanical fragility of vapor-deposited metal films.
Solution Approach 2:
The patent employs composite materials consisting of multiple polymer layers with different refractive indices arranged in a specific multilayer structure. This composite structure provides both the desired metallic gloss through constructive interference of light and the mechanical durability of polymer materials, eliminating the cracking issue of metal coatings.
2Productivity
If a metal is vapor-deposited at a time on a film or the like and the coated film or the like is slit to produce filaments, then production efficiency is improved, but the slit filaments are undesirably thick and flat compared to ordinary fibers, resulting in woven or knit fabric that is poor in softness
Solution Approach 1:
The patent segments the fiber cross-section into multiple thin layers (typically 5-20 layers) with different refractive indices, creating a multilayer structure that produces metallic gloss through optical interference. This segmentation allows the fiber to maintain a fine, round cross-section suitable for soft fabrics while achieving the desired optical properties without requiring metal vapor deposition.
3Illumination intensity
If fibers have a cross-section including superposed platy structures to produce structural coloring, then color is achieved, but the superposed platy structures are superposed layers of incompatible polymers, making interlaminar separation prone to occur, requiring a thick protective layer that increases fiber diameter and makes fabric stiff
Solution Approach 1:
The patent applies local quality by using compatible polymer materials throughout the multilayer structure, ensuring that each layer bonds well with adjacent layers. This eliminates the need for thick protective layers while maintaining structural integrity. The multilayer structure achieves structural coloring through precise control of layer thickness and refractive index differences without requiring incompatible polymer combinations.
4Strength
If conventional synthetic fibers are used to achieve mechanical properties and dimensional stability, then durability is improved, but the fibers lack a high degree of sense or functions not possessed by any conventional synthetic fibers
Solution Approach 1:
The patent changes the optical parameters of synthetic fibers by creating a multilayer structure with specific refractive index differences and controlled thicknesses. This produces structural coloring and metallic gloss effects that conventional single-layer synthetic fibers cannot achieve. The fiber maintains mechanical durability while gaining enhanced aesthetic properties and a high-grade sense through optical interference effects.
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 glossy fiber achieves a deep, lustrous appearance with reduced viewing-angle dependence and improved softness, making it suitable for garment applications while maintaining mechanical properties.
Implementation Method 1
two polymers differing in refractive index are alternately superposed to form an alternating multilayer structure while accurately controlling the number of superposed layers and the thickness of each layer, thereby making it possible to impart structural coloring due to the interference and reflectance of light
Implementation Method 2
the gloss of a natural material is more complicated and fascinating and has a high-grade sense compared to the monotonous glosses possessed by single fibers
Implementation Method 3
containing light-absorbing particles in an amount of 0.01-5.0 wt % in at least one polymer constituting the fiber, the light-absorbing particles having an average transmittance of 40% or less in the visible-light wavelength region
Implementation Method 4
containing air voids in a number density of 5.0 voids/μm2 or higher in at least one polymer constituting the fiber
Data Source
AI summary
Glossy fibers can be processed into woven or knitted fabric suitable for clothing applications while exhibiting a sense of deep, lustrous glossiness. The glossy fibers are characterized by having an average reflectance for the visible light region of 20% or greater, an average transmittance of 40% of less, and a contrastive glossiness of 3.0 or less.