Segmented Hair Coloring Method for Uniform Tone

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Solution Overview

Problem

Current retail hair color products fail to achieve uniform color tones across different hair sections, as they do not account for the varying properties of hair roots, lengths, and tips, leading to inconsistent results and damage from excessive dye deposition or bleaching.

Innovation Solution

A method involving two hair color compositions with different concentrations of oxidative dye precursors, alkalizing agents, and oxidizing agents is applied, where the first composition is used on hair roots and a portion of lengths and tips, and the second composition with lower concentrations is applied to the remaining lengths and tips, to achieve a more natural color gradient.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a single retail hair color composition is applied to all hair portions, then the application process is simple, but the color uniformity across different hair sections deteriorates

Engineering Contradiction:

Improveapplication process simplicityVSAvoidcolor uniformity

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The invention divides the hair coloring process into segments by applying different compositions to different hair portions. The first composition is applied to roots and intermediate lengths, while the second composition is applied to tips, allowing each section to receive tailored treatment for optimal color uniformity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention implements local quality by formulating two distinct hair color compositions with different properties. The first composition has higher dye precursor and peroxide concentrations for roots and intermediate sections, while the second composition has lower concentrations suitable for damaged tips, ensuring each hair portion receives appropriate treatment.

Inventive Principle:

Principle #3Local quality

2Reliability

If high concentration oxidative dye is applied to all hair portions, then strong coloring effect is achieved, but hair damage increases due to over-bleaching and excessive dye deposition

Engineering Contradiction:

Improvecoloring effectivenessVSAvoidhair damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The invention applies local quality by using high concentration oxidative dye in the first composition for roots and intermediate hair portions that require stronger coloring, while using low concentration oxidative dye in the second composition for damaged tips, thereby achieving effective coloring without excessive damage.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The invention implements parameter changes by varying the concentration of oxidative dye precursors and peroxide between two compositions. The first composition contains higher concentrations (0.5-5% dye precursors, 3-12% peroxide) while the second contains lower concentrations (0.1-2% dye precursors, 1-6% peroxide), allowing tailored treatment for different hair sections.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If previous hair coloring treatments are performed, then desired color change is achieved, but hair condition deteriorates with non-homogenous color and increased damage at tips

Engineering Contradiction:

Improvecolor change achievementVSAvoidhair color homogeneity

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The invention segments the hair into three portions (roots, intermediate lengths, tips) and applies different compositions to each, addressing the non-homogenous color problem caused by previous coloring treatments. This segmented approach allows each portion to be treated according to its specific condition and color needs.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention addresses color homogeneity by applying local quality through two specialized compositions. The first composition targets roots and intermediate sections with higher dye concentration, while the second composition targets previously colored tips with lower dye concentration, ensuring uniform final color across all hair portions.

Inventive Principle:

Principle #3Local quality

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 approach allows for a more uniform and natural-looking hair color result, reducing damage by tailoring the dye deposition and bleaching to the specific needs of each hair section, thereby improving the overall color consistency and health of the hair.

Implementation Method 1

an oxidative hair-coloring agent (I) comprising an oxidative dye, ammonia and hydrogen peroxide

Methodology Applied

Scientific EffectOxidation: Oxidation

Implementation Method 2

oxidative dye precursors and/or the concentration of the oxidizing agents

Methodology Applied

Scientific EffectChemical Bonding: Chemical Bonding

Implementation Method 3

an alkalizing agent and/or the pH is adjusted to a value between about 8 and about 13

Methodology Applied

Scientific EffectpH adjustment:

Data Source

PatentEP2881146B1Hair colouring method

Publication Date: 2020.02.26 NOXELL CORP

AI summary

Method for colouring hair wherein a first and a second hair colouring composition are applied to the hair, wherein the concentration of the oxidative dye precursors and/or the concentration of the alkalizing agents and/or the concentration of the oxidizing agents comprised in the second hair colouring composition is lower than in the first hair colouring composition.