Elastic Perming Rod with Pins for Tension Control
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Solution Overview
Problem
Existing perming rods face issues such as hair loosening due to clearance between the rod and rubber band, discomfort due to strong tension, poor heat transfer, and difficulty in forming suitable wave curls, leading to inefficient and painful permanent wave treatments.
Innovation Solution
A perming rod with a columnar core, an elastic outer surface, and pins at each end, providing suitable strength, heat transfer, and deformability to hold hair without excessive tension, while preventing chemical solution flow and facilitating easy rubber band hooking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rubber band is hooked on the drum-shaped perming rod with smaller center diameter, then the hair bundle can be held firmly, but a clearance is formed between the outer peripheral surface and the rubber band causing hair loosening
Solution Approach 1:
The invention changes the diameter parameter of the perming rod from a drum shape with varying diameter to a uniform cylindrical shape, eliminating the clearance between the rod surface and the rubber band while maintaining firm holding capability
Solution Approach 2:
The invention uses a composite structure combining a resin core with an elastic outer layer, where the resin core provides structural strength and the elastic layer provides frictional holding force, allowing the rubber band to be hooked firmly without clearance
2Strength
If the rubber band is hooked strongly to prevent hair loosening, then the hair bundle is held firmly, but the hairs are strongly pulled causing customer pain and reducing workability
Solution Approach 1:
The invention changes the material property parameter of the outer layer to elastic material, which provides frictional holding force through elasticity rather than through strong mechanical hooking, thereby reducing pain while maintaining holding effectiveness
Solution Approach 2:
The invention uses an elastic outer layer that can deform and conform to the rubber band, providing a flexible interface that reduces stress concentration and pain while maintaining the holding force necessary to prevent hair loosening
3Device complexity
If the perming rod is made of hollow synthetic resin with hard outer peripheral surface, then the structure is simple, but the heat transfer is poor and beautiful wave curl cannot be obtained within short time
Solution Approach 1:
The invention uses a composite structure with a resin core for structural simplicity and an elastic outer layer that improves heat transfer properties, combining the advantages of both materials to achieve both structural simplicity and effective heat transfer
Solution Approach 2:
The elastic outer layer acts as a thermal interface that improves heat transfer from the rod to the hair, allowing beautiful wave curls to be obtained within a short time while maintaining the simple overall rod structure
4Object-affected harmful factors
If the perming rod is made too soft to reduce hair displacement, then the customer feels less pain, but it is difficult to form wave curl of the hairs in a suitable shape
Solution Approach 1:
The invention uses a composite structure where the resin core provides structural rigidity for forming suitable wave curls while the elastic outer layer provides softness and comfort, allowing both pain reduction and proper curl formation
Solution Approach 2:
The invention applies different material properties to different parts of the rod - the core provides hardness for shape formation while the outer layer provides softness for comfort, creating local quality differentiation that resolves the contradiction
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
Enables efficient and pain-free permanent wave treatments with improved heat transfer and reduced hair slippage, allowing for beautiful curls without damage, and simplifies the hooking process for beauticians.
Implementation Method 1
an elastic portion covering an outer peripheral surface of the core and formed of an elastic body
Implementation Method 2
a waterproof surface portion covering an outer peripheral surface of the elastic portion
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A perming rod (1) having an outer peripheral surface around which hairs are to be wound includes a columnar core, an elastic portion (11) covering an outer peripheral surface of the core (10) and formed of an elastic body, a waterproof surface portion (12) covering an outer peripheral surface of the elastic portion (11), and pins (15) attached to each end portion of the elastic portion (11). With this configuration, the hairs can be held with suitable tension by easy treatment. Thus, beautiful permanent waves can be obtained without providing uncomfortable pain to a customer.