Razor Blade Titanium Parylene Coating Adhesion

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Solution Overview

Problem

Razor blades with PTFE coatings face issues of non-uniformity, reduced hardness, and corrosion resistance due to high application temperatures, and environmental concerns related to persistent materials, while alternative parylene coatings lack adhesion, leading to increased cutting forces during shaving.

Innovation Solution

A razor blade configuration featuring a titanium layer followed by a parylene layer, applied via physical and chemical vapor deposition respectively, enhances adhesion and reduces cutting forces, with specific thicknesses and combinations of Parylene-N and Parylene-C for improved performance, and optionally includes a hard coating for durability.

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 parameters from high-temperature sintering to low-temperature physical vapor deposition, allowing PTFE particles to be deposited uniformly without thermal degradation. This parameter change enables both good lubrication performance and coating uniformity to be achieved simultaneously.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the thermal field (sintering process) with a physical vapor deposition process, using condensed PTFE vapor instead of sprayed particles that require high-temperature sintering. This substitution eliminates the need for high-temperature processing while achieving uniform coating deposition.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Ease of manufacture

If PTFE coating is applied by sintering at high temperatures, then coating is formed, but blade hardness and corrosion resistance deteriorate

Engineering Contradiction:

Improvecoating formationVSAvoidblade hardness and corrosion resistance

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The patent fundamentally changes the temperature parameter from high-temperature sintering (>327°C) to low-temperature physical vapor deposition (below 100°C), preventing thermal damage to the blade substrate while still achieving effective PTFE coating formation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent substitutes the thermal sintering mechanism with a physical vapor deposition mechanism, where PTFE is deposited in a condensed vapor state without requiring high temperatures, thus preserving the blade's mechanical properties and corrosion resistance.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Device complexity

If parylene coating is applied directly without adhesion layer, then manufacturing complexity is reduced, but adhesion deteriorates and cutting forces increase

Engineering Contradiction:

Improvecoating structureVSAvoidadhesion

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent introduces a titanium adhesion layer as an intermediary between the blade substrate and the parylene coating. This intermediate layer provides both mechanical anchoring and chemical bonding sites, ensuring strong adhesion while maintaining a relatively simple overall structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite coating structure consisting of a titanium adhesion layer combined with a parylene lubrication layer. This composite structure leverages the strong adhesion properties of titanium and the low-friction properties of parylene to achieve both good bonding and reduced cutting forces.

Inventive Principle:

Principle #40Composite materials

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 titanium-parylene configuration results in reduced cutting forces and improved adhesion, maintaining razor blade performance and durability, while minimizing environmental impact by reducing PTFE usage and enhancing shaving experience.

Implementation Method 1

A razor blade configuration featuring a titanium layer followed by a parylene layer, applied via physical and chemical vapor deposition respectively

Methodology Applied

Scientific EffectPhysical vapor deposition: Physical Vapour Deposition

Implementation Method 2

A razor blade configuration featuring a titanium layer followed by a parylene layer, applied via physical and chemical vapor deposition respectively

Methodology Applied

Scientific EffectChemical vapor deposition: Chemical Vapour Deposition

Data Source

PatentEP4464478A1Razor blade comprising a parylene and titanium

Publication Date: 2024.11.20 BIC VIOLEX SINGLE MEMBER SA

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AI summary

The present disclosure relates to a razor blade provided with a first layer comprising titanium and a second layer comprising a parylene. The present disclosure also relates to a razor cartridge comprising at least one razor blade provided with a first layer comprising titanium and a second layer comprising a parylene. The present disclosure further relates to method for coating a razor blade with a first layer comprising titanium and a second layer comprising a parylene.