Split-Tip Razor Blade Geometry for Lower Skin Irritation
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Solution Overview
Problem
Existing razor blades with symmetrical shapes do not fully optimize shaving geometry, leading to suboptimal shaving performance and potential skin irritation.
Innovation Solution
The development of asymmetric razor blades with a split line through the tip portion, defining asymmetric sections with varying facets and a bevel shoulder on one section to minimize tip pressure and enhance skin-contacting performance, while maintaining a sharp cutting edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a symmetrical blade shape is used, then the blade structure is simple and easy to manufacture, but the shaving geometry is suboptimal leading to reduced shaving performance and increased skin irritation
Solution Approach 1:
The patent applies asymmetry by dividing the blade tip into asymmetric first and second sections with different facet configurations. The first section has first and third facets while the second section has only a second facet, creating an asymmetric geometry that optimizes shaving performance by reducing cutting forces and minimizing skin irritation, while maintaining manufacturing feasibility through a systematic design approach
2Reliability
If the blade tip is made sharper to improve cutting performance, then the cutting edge becomes more effective, but the tip pressure increases causing skin irritation
Solution Approach 1:
The patent segments the blade tip into asymmetric first and second sections separated by a split line, with each section having different facet configurations. This segmentation allows the blade to have a sharp cutting edge for effective cutting while distributing pressure more evenly across the tip, reducing concentrated stress on the skin and minimizing irritation
Solution Approach 2:
The patent applies local quality by giving different regions of the blade tip different geometric properties. The first section has first and third facets while the second section has only a second facet, creating localized geometric variations that optimize both cutting performance and pressure distribution in different areas of the blade tip
Data Source
AI summary
A razor blade is provided comprising a substrate comprising a first portion and a second portion. The first portion may comprise first and second generally parallel outer surfaces. The second portion may comprise first and second sections separated by a split line. The first section may comprise a first facet extending directly from the first outer surface of the first portion and an end facet extending directly from the first facet. The second section may comprise an end facet. The end facets of the first and second sections may converge at a tip to define a cutting edge. The split line may pass through the tip and is generally parallel with and extends between the first and second outer surfaces of the first portion.