Parylene C and N Lubrication Layer for Razor Blades

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Solution Overview

Problem

Conventional razor blade lubrication coatings made of PTFE suffer from non-uniformity, reduced hardness and corrosion resistance due to high temperature sintering, and environmental concerns related to persistent materials, while also requiring spraying methods that result in defects and uneven application.

Innovation Solution

A razor blade with a lubrication layer comprising Parylene C and Parylene N, applied via chemical vapor deposition, which provides a low cutting force and improved adhesion, and can include additional hard coatings and capping layers for enhanced durability, applied using thin film deposition technologies to ensure uniformity and reduce defects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If PTFE coating is applied by spraying and sintering, then lubrication performance is improved, but coating uniformity deteriorates and manufacturing precision is reduced

Engineering Contradiction:

Improvelubrication performanceVSAvoidcoating uniformity

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent changes the deposition method from spray sintering to chemical vapor deposition (CVD), fundamentally altering the process parameters to achieve uniform coating application without the defects associated with particle spraying and sintering

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the mechanical spray application method with a chemical vapor deposition process, where PTFE particles are converted to vapor phase and then deposited uniformly on the blade surface, eliminating the non-uniformity inherent in mechanical spraying

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If PTFE coating is sintered at high temperature, then coating adhesion is improved, but blade hardness and corrosion resistance deteriorate

Engineering Contradiction:

Improvecoating adhesionVSAvoidblade hardness and corrosion resistance

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent changes the temperature parameter from high-temperature sintering (>150°C) to low-temperature CVD deposition (<100°C), maintaining coating adhesion while preserving the hardness and corrosion resistance of the blade substrate

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces thermal sintering with chemical vapor deposition, using chemical reactions in the vapor phase to form the coating bond rather than relying on high-temperature melting and bonding, thus avoiding thermal damage to the blade

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of manufacture

If PTFE particles are sprayed onto the blade, then coating application is simplified, but coating uniformity and defect reduction deteriorate

Engineering Contradiction:

Improvecoating application simplicityVSAvoidcoating uniformity and defect reduction

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent replaces mechanical particle spraying with chemical vapor deposition, where PTFE monomers are delivered via vapor phase and deposit uniformly on the blade surface through chemical reactions, eliminating particle aggregation and non-uniform distribution

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the phase parameter of PTFE from solid particles to vapor phase monomers, enabling uniform distribution and deposition through vapor-phase transport and chemical reaction rather than mechanical particle deposition

Inventive Principle:

Principle #35Parameter changes

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 Parylene C and Parylene N lubrication layer achieves reduced cutting force and improved shaving performance with enhanced durability and reduced environmental impact, while ensuring uniformity and adhesion, outperforming coatings made from PTFE or other PFAS materials.

Implementation Method 1

A razor blade with a lubrication layer comprising Parylene C and Parylene N, applied via chemical vapor deposition

Methodology Applied

Scientific EffectChemical vapor deposition: Chemical Vapour Deposition

Data Source

PatentEP4464477A1Razor blade comprising parylene c and parylene n

Publication Date: 2024.11.20 BIC VIOLEX SINGLE MEMBER SA

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AI summary

The present disclosure relates to a razor blade with a lubrication layer provided thereon, wherein the lubrication layer comprises Parylene C and Parylene N. The present disclosure also relates to a razor cartridge comprising at least one razor blade provided with a lubrication layer provided thereon, wherein the lubrication layer comprises Parylene C and Parylene N. The present disclosure further relates to a method for coating a razor blade with a lubrication layer, wherein the lubrication layer comprises Parylene C and Parylene N.