Multi-Blade Razor with Varying Cutter Force
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Solution Overview
Problem
Conventional razor blades often compromise between shaving closeness and comfort, as they either provide insufficient frictional resistance to effectively engage and cut hair or excessive friction that leads to discomfort.
Innovation Solution
A safety razor design featuring multiple blades with varying frictional resistance, where one blade has a higher cutter force and frictional resistance for engaging and pulling hair, while another blade with a polymer coating reduces friction for improved comfort, allowing for a combination that enhances shaving closeness without compromising comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a polymer coating is applied to the blade edge to reduce frictional resistance, then shaving comfort is improved, but cutter force is reduced and shaving closeness deteriorates
Solution Approach 1:
The razor blade assembly is segmented into multiple blades (first blade and second blade) with different properties. The first blade has a polymer coating for comfort, while the second blade has a metal edge for high cutter force, allowing each segment to perform its specialized function
Solution Approach 2:
Different regions of the blade assembly have different local qualities - the first blade edge has a polymer coating with low friction for comfort, while the second blade edge has a metal surface with high friction for effective hair engagement and cutting
2Productivity
If frictional resistance is increased to improve hair engagement, then shaving closeness is improved, but shaving comfort deteriorates
Solution Approach 1:
The blade assembly is divided into functional segments where the second blade provides high frictional resistance for hair engagement and cutting, while the first blade provides low friction for comfort, allowing both requirements to be met simultaneously
Solution Approach 2:
The second blade edge has a metal surface with high local frictional resistance to effectively engage and cut hair, while the first blade edge has a polymer coating with low local friction to ensure comfort during shaving
3Device complexity
If a single blade design is used, then device complexity is reduced, but the ability to simultaneously provide closeness and comfort is compromised
Solution Approach 1:
The single blade is segmented into multiple blades within the assembly, each with distinct properties (polymer coating vs. metal edge), allowing the system to achieve multiple shaving performance targets that a single blade cannot accomplish alone
Solution Approach 2:
The blade assembly achieves multi-functionality by combining blades with different properties - one blade handles comfort and glide, while another blade handles cutting force and hair engagement, making the overall system capable of performing multiple shaving functions 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 design achieves improved shaving efficiency by increasing the engagement time of the blade with hair, resulting in a closer shave with increased hair removal per stroke while maintaining comfort.
Implementation Method 1
a thin polymer coating on the blade edge, which can reduce the frictional resistance between the blade edge and the skin
Implementation Method 2
modifying the surface of the blade to provide a blade having increased frictional resistance and increased cutter forces
Data Source
AI summary
Razors are described herein. In some instances the razors include a safety razor blade unit that includes a guard, a cap, and at least two blades with parallel sharpened edges located between the guard and cap. A first blade defines a blade edge nearer the guard and a second blade defines a blade edge nearer the cap. The first blade has a cutter force greater than the cutter force of the second blade. In some instances the razors provide a comfortable shave having improved closeness.