Aperture Blade Shaving Kit Reducing Skin Irritation
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Solution Overview
Problem
Conventional hair removal devices with straight linear blades cause skin irritation due to high pressure and shear rates, especially when used at angles other than perpendicular to the blade, leading to nicks and cuts, and require specialized lubrication to reduce irritation.
Innovation Solution
A shaving aid composition and kit featuring a treatment sheet with aperture blades that allow for safe hair removal in any direction, utilizing a shaving aid composition with a polar component of surface free energy between 30 to 80 mJ/m², providing lubrication and cushioning, and a hair removal device with a planar treatment sheet and metallic frame member for reduced pressure and increased safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional straight linear blades are used at a clearance angle of 20° to achieve a close shave, then hair removal efficiency is improved, but skin irritation and nicks increase
Solution Approach 1:
The blade is divided into multiple aperture blades arranged in a circular pattern, each contributing to the cutting action. This segmentation allows the cutting function to be distributed across multiple smaller edges rather than concentrated on a single large blade, reducing the harmful pressure on any one point of the skin while maintaining effective hair removal
Solution Approach 2:
Instead of positioning the blade edge at an angle (20° clearance angle) to achieve cutting efficiency, the invention inverts the approach by placing the aperture blades parallel to the skin surface (0° clearance angle). The cutting action is achieved through the aperture geometry and blade movement rather than through a traditional angled edge, thereby eliminating skin irritation while maintaining hair removal effectiveness
2Manufacturing precision
If the contact area between blade and skin is reduced to increase cutting precision, then shaving precision is improved, but pressure on skin increases causing irritation
Solution Approach 1:
The total cutting action is segmented across multiple aperture blades distributed around the treatment sheet. Each aperture blade has a small contact area for precise cutting, but the cumulative contact area of all aperture blades provides sufficient skin support to distribute and reduce pressure, preventing the high pressure that causes irritation
Solution Approach 2:
The invention transitions from a single-point or linear contact model to a distributed areal contact model. The aperture blades create multiple discrete contact points arranged in a two-dimensional pattern across the treatment sheet, transforming the pressure distribution from concentrated to distributed, thereby reducing peak pressure while maintaining cutting precision
3Ease of operation
If treatment sheet transparency is increased to improve visibility, then user comfort is improved, but skin support is reduced allowing skin bulging and irritation
Solution Approach 1:
The treatment sheet is designed with non-uniform optical properties: the substrate material providing skin support has reduced transparency to maintain structural integrity and skin support, while the aperture regions remain transparent to allow visibility of the cutting action. This local differentiation of transparency ensures both skin safety and user comfort are achieved in their respective zones
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 solution enables a safe and efficient shave by reducing skin irritation and pressure, allowing the use of the device in multiple directions with a larger contact area and lower shear rates, maintaining lubrication and cushioning, and supporting skin safety and hair removal efficiency.
Implementation Method 1
This shaving aid fluid forms a liquid film between the blade edge and the skin to protect the skin from direct contact and it lubricates the skin
Implementation Method 2
it lubricates the skin which reduces the skin bulging into the gaps between the blades
Implementation Method 3
The aperture blades can be used in any direction resulting in a more efficient shaving
Data Source
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AI summary
The present invention refers to a shaving aid composition and a shaving kit comprising a hair removal device comprising a planar treatment sheet with aperture blades.