Wig Hair Sheath Core Structure Bending Rigidity Control
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Solution Overview
Problem
Wigs made from artificial hair materials like polyamide and polyester fibers struggle to blend seamlessly with natural hair due to differences in bending rigidity, leading to visible separation and unnatural styling.
Innovation Solution
A wig design with a sheath/core structure artificial hair that controls bending rigidity by using a high rigidity polyamide core and a lower rigidity polyamide sheath, and adjusting the mass ratio, is partitioned into regions with varying bending rigidities to match the wearer's natural hair, ensuring a natural appearance and easy styling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyester fibers are used for wig hair, then strength and heat stability are improved, but bending rigidity becomes too high causing unnatural appearance and discomfort
Solution Approach 1:
The patent uses a composite fiber structure combining polyester and polyamide fibers, where polyester provides strength and heat stability while polyamide contributes lower bending rigidity and natural feel, achieving a balance between mechanical properties and flexibility
Solution Approach 2:
The wig hair is designed with non-uniform fiber composition along the hair shaft, with different ratios of polyester and polyamide fibers at different locations to optimize both strength and bending flexibility for natural appearance
2Stability of the object's composition
If artificial hair with high bending rigidity is used, then shape preservation is improved, but blending with natural hair deteriorates due to visible separation
Solution Approach 1:
The patent adjusts the bending rigidity parameter of artificial hair by controlling the fiber composition and structure to match natural hair's flexibility, enabling seamless blending while maintaining adequate shape preservation through optimized mechanical properties
3Ease of operation
If polyamide fibers are used for wig hair, then bending rigidity is reduced for better flexibility, but shape preservation deteriorates due to poor heat stability
Solution Approach 1:
The patent creates a composite fiber system where polyamide provides bending flexibility and natural feel while polyester contributes heat stability and shape memory, achieving synergistic effects that resolve the trade-off between flexibility and shape preservation
Data Source
Figure 1
Figure 2
Figure 3(A)~3(B)
AI summary
A wig (10, 30) is made with artificial hairs (12, 13, 32, 33) having bending rigidities depending upon portions attached to respective portions. A wig base (11, 31) is partitioned to a plurality of regions, and the hair (12, 32) having bending rigidity lower than average natural hair is attached to the periphery (11a) of the left and right side head portions and the rear head portion and to the total peripheral region (31A), and blended with the wearer's own hair growing around the wig. On the other hand, in the region toward the center of the wig base (11, 31), the hair (13, 33) having bending rigidity of the same level as natural hair is attached. The artificial hair (12, 13, 32, 33) has the pre-determined length and curl diameter depending upon respective regions, and especially, the hair (13) to be attached to the peripheral portion (11a) and the hair (33) to be attached to the total peripheral region (31A) have the curl diameter and/or length of substantially the same level as the hair growing on the wearer's scalp.