Hydrocarbon Polymer Razor Blade Coating for Low-Force Edge Durability
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Solution Overview
Problem
Existing razor blade coatings do not effectively enhance cutting performance, reduce skin nicking, and are not cost-effective or time-efficient to manufacture, while maintaining durability and lubricity.
Innovation Solution
A razor blade with a sharpened cutting edge coated with a lubricious hydrocarbon polymer layer, optimized for bonding and durability, applied through deposition and curing to achieve at least 10% crystallinity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hard coating is applied to strengthen the blade edge, then the blade strength is improved, but the cutting force increases and shaving comfort deteriorates
Solution Approach 1:
The patent applies a multi-layer composite coating structure where a hard coating layer (providing blade edge strength) is combined with a lubricious outer coating layer (reducing cutting force). This composite structure allows both layers to function simultaneously without compromising each other's properties, resolving the contradiction between blade strength and cutting comfort.
Solution Approach 2:
The patent creates different surface properties at different locations of the blade edge. The inner layer maintains high hardness for structural strength, while the outer layer provides low friction and lubricity for reduced cutting force. This local differentiation of material properties allows the blade to exhibit both strength and comfort characteristics in different functional zones.
2Force
If an outer coating is applied to reduce cutting force, then shaving comfort is improved, but the coating durability and resistance to wear deteriorates
Solution Approach 1:
The patent uses a composite coating system where the lubricious outer layer is supported by a hard inner coating layer. This structure allows the outer layer to provide cutting comfort while the inner layer provides structural support and durability, preventing the outer layer from wearing off prematurely during shaving operations.
Solution Approach 2:
The hard inner coating layer acts as a protective substrate that cushions and supports the more vulnerable lubricious outer layer. This pre-established protective structure prevents direct mechanical damage to the outer layer, thereby maintaining its lubricity and functional integrity throughout the blade's service life.
3Ease of manufacture
If existing coating processes are used, then manufacturing is simple, but the coating does not effectively enhance cutting performance or reduce skin nicking
Solution Approach 1:
The patent implements a multi-layer composite coating process that builds upon conventional single-layer coating techniques. By sequentially applying different functional layers with optimized material compositions and thicknesses, the process maintains manufacturing simplicity while achieving superior cutting performance and skin protection through the synergistic effects of the composite structure.
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 hydrocarbon polymer coating reduces cutting force, enhances shaving comfort and safety, and maintains durability, while being cost-effective and efficient to produce.
Implementation Method 1
a lubricious, hydrocarbon polymer coating material deposited on the outer bonding surface of the sharpened cutting edge
Implementation Method 2
The hydrocarbon polymer may be cured to exhibit at least 10% crystallinity
Data Source
AI summary
A razor blade with a sharpened cutting edge with an outer bonding surface. A hydrocarbon polymer organic coating material deposited on the outer bonding surface forming an outermost layer of the sharpened cutting edge. The hydrocarbon polymer organic coating is composed of one or more layers. Additionally, the method of coating the cutting edge is described.