Razor Cartridge Blade Thickness Span Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional razor cartridges do not adequately consider the correlation between the shape, thickness, and span of razor blades, which affects shaving comfort and performance, leading to issues with cutting force, durability, and skin irritation.
Innovation Solution
A razor cartridge design that incorporates a combination of thin and thick blades with varying thickness profiles and spans, where the thin blades have a narrower span to reduce cutting resistance and skin irritation, and the thick blades have a wider span for improved durability and discharge performance, optimizing the correlation between blade thickness and span.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the tip edge of the razor blade is made thick and strong, then the service life and durability are improved, but the cutting force increases and causes more tugging and pulling, reducing shaving comfort
Solution Approach 1:
The patent applies local quality by creating different tip edge thicknesses at different positions along the blade. Specifically, the ultimate tip has a first thickness while a position closer to the base has a second thickness greater than the first. This gradient thickness distribution allows the blade to have both durability (thicker base portion) and cutting performance (thinner ultimate tip), resolving the contradiction between service life and shaving comfort.
2Productivity
If the span between blades is made wide, then the discharge of shaving substances is improved, but the cartridge size increases causing skin irritation and blade damage
Solution Approach 1:
The patent applies parameter changes by optimizing the span distance between blades based on their individual thickness characteristics. Thinner blades are positioned with larger spans to facilitate discharge, while thicker blades use smaller spans to reduce cartridge size and prevent skin irritation. This dynamic adjustment of span parameters according to blade properties resolves the contradiction between discharge performance and skin comfort.
3Object-affected harmful factors
If the span between blades is made narrow, then the cartridge size is reduced and skin irritation is minimized, but the discharge of shaving substances is hindered
Solution Approach 1:
The patent applies local quality by assigning different span distances to different blades based on their thickness and position. Thinner blades (which cause less irritation) are given larger spans to ensure proper discharge, while thicker blades are given smaller spans. This localized optimization of span parameters for each blade position simultaneously achieves skin protection and effective discharge functionality.
4Productivity
If the exposure of the blade is increased (positive exposure), then the cutting performance is improved, but the possibility of cutting the skin increases
Solution Approach 1:
The patent applies parameter changes by optimizing the exposure parameter for each blade based on its thickness and position in the cartridge. By adjusting exposure in conjunction with span and thickness parameters, the system achieves optimal cutting performance while controlling skin cutting risk. Thinner blades may have different exposure settings compared to thicker blades, creating a coordinated parameter set that balances performance and safety.
Data Source
AI summary
The present invention is directed to an arrangement of blades mounted within a razor cartridge. The razor cartridge includes a blade housing; and a plurality of blades including a first blade and a second blade, wherein a thickness of an edge portion of the first blade is less than a thickness of an edge portion of the second blade, and wherein a first span in front of the first blade is less than a second span in front of the second blade.