Razor Blade Coating Dual-Stage Heating Adhesion

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Solution Overview

Problem

Current methods for sintering polyfluorocarbon coatings on razor blades are labor and equipment intensive due to the short duration at target temperature, which affects bonding and durability.

Innovation Solution

A dual-stage heating process is applied to the razor blade cutting edge, with initial and secondary heating stages at specific temperatures to ensure prolonged exposure above the polyfluorocarbon's melting point, followed by optional solvent or mechanical treatment to achieve a uniform and durable coating.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the time duration at target temperature is increased to improve polymer bonding, then the adhesion and durability of the coating is improved, but the processing time and labor intensity increase

Engineering Contradiction:
Improvecoating adhesion and durabilityVSAvoidprocessing time
Core Design Contradiction:
ReliabilityVSLoss of time

Solution Approach 1:

The heating process is divided into multiple stages with different temperature profiles. The method applies initial heating to melt the polyfluorocarbon polymer, followed by secondary heating at elevated temperatures to enhance bonding. This segmentation allows optimized time at each temperature stage, achieving strong adhesion without excessive total processing time.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent employs dynamic temperature parameter changes during the heating process. By varying the temperature profile (initial heating stage followed by secondary heating stage), the process achieves effective polymer bonding in reduced time compared to maintaining a constant high temperature throughout, thus resolving the contradiction between bonding quality and processing time.

Inventive Principle:
Principle #35Parameter changes

2Reliability

If multiple coating applications are performed to improve coating uniformity and durability, then the coating quality is improved, but the processing time and equipment usage increase

Engineering Contradiction:
Improvecoating uniformity and durabilityVSAvoidprocessing efficiency
Core Design Contradiction:
ReliabilityVSProductivity

Solution Approach 1:

The patent achieves superior coating quality with a single application by implementing a two-stage heating process with optimized temperature parameters. The initial heating stage melts the polymer for uniform distribution, while the secondary heating stage enhances bonding. This parameter optimization eliminates the need for multiple coating applications, maintaining high productivity.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The continuous heating process with optimized temperature progression ensures complete melting and uniform distribution of the polymer coating in a single pass. The sustained elevated temperature during secondary heating ensures thorough bonding, achieving the same quality outcomes as multiple applications would provide, but in a continuous single-step process.

Inventive Principle:
Principle #20Continuity of useful action

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

This method enhances the adhesion and durability of the polyfluorocarbon coating, improving shaving performance without increasing processing time or requiring additional coating applications.

Implementation Method 1

the time duration at the target temperature is critical because it drives the bonding of the polymer and the hard outer layer of the blades

Methodology Applied
Scientific EffectMelting: Melting

Implementation Method 2

performing a single heating of the coated blade edge to adhere the polymer material to the razor blade cutting edge

Methodology Applied
Scientific EffectSintering: Sintering

Data Source

PatentUS20240051168A1Method of treating razor blade cutting edges
Publication Date: 2024.02.15 THE GILLETTE CO
  • US20240051168A1 patent drawing
  • US20240051168A1 patent drawing
  • US20240051168A1 patent drawing

AI summary

A method of manufacturing a razor blade cutting edge, the method including: applying a single coating of a polymer material to the razor blade cutting edge to form a coated blade edge; performing a single heating of the coated blade edge to adhere the polymer material to the razor blade cutting edge wherein the single heating of the coated blade edge comprises a first heating stage and a second heating stage; and optionally treating the coated blade edge with a solvent or a mechanical process to partially remove the coating. Also provided is a razor blade cutting edge produced according to the disclosed method.