Razor Blade Edge Polyfluorocarbon Coating Process
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Solution Overview
Problem
Conventional razor blades require excessive force for shaving, leading to discomfort and irritation, and existing polyfluorocarbon coatings do not maintain low cutting forces over the life of the blade.
Innovation Solution
A method involving a polyfluorocarbon coating process where a first polytetrafluoroethylene coating is applied, heated, solvent-treated to thin it, and then re-coated with a second polytetrafluoroethylene layer, followed by further heating and solvent treatment to achieve a thin, uniform, and well-adhered coating that reduces cutting forces and maintains improved shaving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polyfluorocarbon coating is applied to reduce cutting forces, then initial shave comfort is improved, but the coating wears and adhesion is lost during subsequent shaves
Solution Approach 1:
The patent applies multiple solvent treatments at different stages (after first coating, after second coating) to precisely control the coating thickness and molecular structure. By changing the solvent treatment parameters, the coating is transformed from a thick, non-uniform state to a thin, uniform state with optimal adhesion and low cutting forces that are maintained throughout the blade's life
Solution Approach 2:
The coating process is divided into multiple discrete stages: first coating application, first heating, first solvent treatment, second coating application, second heating, and second solvent treatment. This segmentation allows each stage to be optimized independently, ensuring both initial comfort and long-term reliability
2Object-affected harmful factors
If a thick polyfluorocarbon coating is applied to reduce cutting forces, then initial shave comfort is improved, but the coating becomes non-uniform and excessive
Solution Approach 1:
The patent extracts excess coating material through solvent treatment steps. After each coating application and heating cycle, a solvent is applied to dissolve and remove the non-adherent portion of the coating, leaving only the thin, uniform, well-adhered layer that provides optimal performance
Solution Approach 2:
The patent performs preliminary coating applications followed by heating and solvent treatment before the final coating. This preliminary action creates a base layer with optimal adhesion properties, ensuring that the final thin coating remains uniform and adherent throughout the blade's life
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 process results in a razor blade with significantly lower initial and sustained cutting forces, reducing discomfort and improving shave quality over the life of the blade, with reduced nicks and enhanced comfort.
Implementation Method 1
heating the coating obtained to melt, partially melt or sinter the fluorocarbon polymer
Implementation Method 2
heating the coating obtained to melt, partially melt or sinter the fluorocarbon polymer
Implementation Method 3
treating the coated blade edge with a solvent to thin the coating
Implementation Method 4
the critical temperature or boiling point of the first and second solvents is above the dissolution temperature for the first and second polyfluorocarbons in the first and second solvents
Data Source
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AI summary
The present invention relates to razor blade cutting edges and methods of producing edges exhibiting improved shave performance longevity and lower cutting forces. Conventional razor blades have increasing cutting forces with use due to the outer coating wear and adhesion loss. Blade edges produced according to the novel process exhibit significantly lower cutting forces when subjected to wool felt cutting shaving simulation, which correlates to more comfortable shaves initially and over the life of the blades. The present invention treats razor blade edges having a first adherent polyfluorocarbon coating with a first solvent to partially remove the polyfluorocarbon coating, adds a second polyflourocarbon coating, heats, and treats the blade edge with a second solvent providing a final blade edge having a thin, uniform polyfluorocarbon coating. Preferred solvents include perfluoroalkanes, perfluorocycloalkanes, and perfluoroaromatic compounds having a critical temperature or boiling point above the dissolution temperature for the polyfluorocarbon in the solvent.