Laser-Textured Razor Blade Facets for Lower Cutting Force
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Solution Overview
Problem
Conventional razor blades with planar facets experience high friction against skin and hair during shaving, requiring increased cutting force and reducing comfort.
Innovation Solution
The method involves forming razor blades with textured surfaces on both facets, achieved through laser ablation, which reduces friction by creating grooves, dimples, or bio-inspired patterns that enhance lubrication and reduce skin irritation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If planar facets are used on razor blades, then the structure is simple and easy to manufacture, but friction between the blade and skin/hair increases requiring more cutting force
Solution Approach 1:
The patent applies local quality by creating textured surfaces with specific patterns (grooves, dimples, or bio-inspired structures) only on the facets that contact skin and hair during shaving. These localized textural modifications are applied to specific regions of the blade facets rather than the entire blade surface, reducing friction in the contact zones while maintaining the overall simple blade structure and manufacturing process.
Solution Approach 2:
The patent employs curvature principles by creating rounded dimples and curved groove patterns on the blade facets. These curved surface features, including hemispherical dimples and arc-shaped grooves, replace portions of the planar surface with curved geometries that reduce friction and improve lubrication retention, thereby reducing the cutting force required while maintaining manufacturability.
2Ease of manufacture
If planar facets are used on razor blades, then manufacturing is simpler, but skin irritation and pull-tug on hairs increase reducing comfort
Solution Approach 1:
The patent applies local quality by creating textured surfaces with specific patterns (grooves, dimples, or bio-inspired structures) only on the facets that contact skin and hair during shaving. These localized textural modifications are applied to specific regions of the blade facets rather than the entire blade surface, reducing friction in the contact zones while maintaining the overall simple blade structure and manufacturing process.
Solution Approach 2:
The patent employs parameter changes by modifying the surface topology parameters of the blade facets through laser ablation or chemical etching. The process changes surface roughness, creates specific geometric patterns with controlled dimensions (e.g., dimple depths of 1-10 micrometers, groove widths of 5-20 micrometers), and alters surface area-to-volume ratios to optimize lubrication retention and reduce skin irritation.
3Ease of operation
If textured surfaces are created on razor blade facets, then friction and skin irritation are reduced improving comfort, but the manufacturing process becomes more complex
Solution Approach 1:
The patent replaces traditional mechanical surface texturing methods (such as mechanical grinding or polishing) with laser ablation technology. This substitution allows for precise control of surface patterns through computer-controlled laser parameters (power, speed, pulse duration) while eliminating the need for complex mechanical tooling and multiple manufacturing steps, thereby reducing overall device complexity despite adding a laser processing step.
Solution Approach 2:
The patent employs parameter changes by modifying the surface topology parameters of the blade facets through laser ablation or chemical etching. The process changes surface roughness, creates specific geometric patterns with controlled dimensions (e.g., dimple depths of 1-10 micrometers, groove widths of 5-20 micrometers), and alters surface area-to-volume ratios to optimize lubrication retention and reduce skin irritation.
4Force
If textured surfaces are created on razor blade facets, then cutting force is reduced improving comfort, but additional manufacturing steps are required
Solution Approach 1:
The patent applies segmentation by dividing the blade facet surface into multiple distinct textural features (individual grooves, dimples, or pattern elements) that are distributed across the surface. This segmentation allows the laser ablation process to create complex overall patterns through repeated application of simple basic features, improving manufacturing efficiency while achieving the friction-reducing textured surface effect.
Solution Approach 2:
The patent employs periodic action through the use of repeating patterns of grooves, dimples, or textural features across the blade facets. The laser ablation process applies periodic pulses to create uniformly spaced features, and the periodic structure allows for efficient manufacturing through pattern repetition while consistently delivering friction reduction and comfort improvement across the entire blade surface.
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 textured surfaces significantly decrease the cutting force required to shave, improving comfort by reducing pull and tug on hairs, while maintaining the structural integrity of the razor blade.
Implementation Method 1
laser ablating a first plurality of elements with a depth between about 0.01 μm and about 20 μm on the first facet
Data Source
AI summary
A method of making a razor blade. The method includes forming a first facet on a first surface of a substrate. A second facet is formed on a second surface of the substrate, opposite the first surface. The first facet and the second facet converge to define a cutting edge. A first plurality of elements is laser ablated with a depth between about 0.01 μm and about 20 μm on the first facet. The first plurality of elements are spaced apart from the cutting edge about 0.05 μm to about 2 μm.