Multi-Layer Erodible Razor Strip for Wear Indication
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Solution Overview
Problem
Existing razor cartridges lack an effective indication for when they are nearing the end of their optimal shave performance, with two-color lubrication strips only providing a distinction between optimal and sub-optimal performance, failing to alert users before the cartridge reaches the end of its effective life.
Innovation Solution
A skin engaging member with multiple erodible layers of different colors and thicknesses, where each layer contains a combination of water-soluble and water-insoluble polymers, is used to indicate the cartridge's remaining lifespan through color changes as the layers wear away during shaving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a two-color lubrication strip is used to indicate cartridge performance status, then the user can distinguish between optimal and sub-optimal performance, but the user cannot receive advance warning before the cartridge reaches end of life
Solution Approach 1:
The lubrication strip is divided into three distinct colored layers (first color, second color, third color) with different thicknesses, where each layer represents a different performance stage. This segmentation allows the indicator to provide multiple stages of warning rather than a single binary state, enabling the user to see progressive degradation and plan replacement accordingly.
Solution Approach 2:
The third color layer is positioned below the second color layer to provide advance warning before the cartridge reaches end of life. This preliminary indication allows the user to acquire and locate a replacement cartridge before the current one becomes completely ineffective, preventing unexpected shaving failures.
2Loss of information
If the skin engaging member uses multiple erodible layers with different colors and thicknesses, then progressive indication of cartridge lifespan is provided, but the device structure becomes more complex
Solution Approach 1:
The indicator function is merged with the lubrication function by combining the colored layers with the lubricating composition. The skin engaging member serves dual purposes: providing lubrication during shaving and simultaneously indicating cartridge performance status through color progression, eliminating the need for separate indicator mechanisms.
Solution Approach 2:
The skin engaging member is constructed as a composite structure with multiple erodible layers containing different colored lubricating compositions. Each layer combines pigment or dye with lubricating agents in a compatible matrix, creating a multi-functional composite material that both lubricates and indicates wear progression.
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 color change from green to yellow and then to red provides a progressive indication to the user that the razor cartridge is approaching and has reached the end of its optimal performance, allowing ample time to replace it, enhancing user experience by providing a pre-alert for maintenance.
Implementation Method 1
Upon exposure to water, the water-soluble shaving aid leaches from the skin engaging member onto the skin
Implementation Method 2
As the user shaves the lubrication member wears away
Data Source
Figure 1~4
Figure 5~7
AI summary
The present invention is directed to a skin engaging member (22) in the form of a narrow elongated strip of dimensions suitable for placement on a razor cartridge (14). The skin engaging member includes a first uppermost erodible layer (24), a second erodible layer (26) positioned below the first layer and a third erodible layer (28) positioned below the second layer. The first layer has a first color and a first thickness dimension. The second layer has a second color different from said the color and a second thickness dimension that is less than the first thickness dimension. The third layer has a third color different from the first color and the second layer and has a third thickness dimension.