Non-Uniform Textile Dyeing Using Sulphamic Acid Granules

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Solution Overview

Problem

Existing methods for achieving non-uniform dyeing on textiles, such as stone-washing and dry decolouring, are unsuitable for delicate materials like wool due to the use of aggressive chemical agents and mechanical abrasion, which can damage the fibers.

Innovation Solution

A process using permeable granules drenched with a sulphamic acid solution to create inert zones on textiles, preventing dye absorption without mechanical abrasion or bleaching, allowing for non-uniform dyeing by controlling the release of sulphamic acid and using additives like urea and isobutanolamine to optimize the reaction and reduce acidity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If stone-washing or dry decolouring processes are used to achieve non-uniform dyeing and ageing effect, then the desired discolouring and colour contrast are obtained, but delicate textiles such as wool are damaged by aggressive chemical agents and mechanical abrasion

Engineering Contradiction:

Improvenon-uniform dyeing effectVSAvoiddamage to textile fibers

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

Instead of removing dye from specific areas (decolouring), the invention applies dye-inert substance to prevent dyeing in predetermined zones. This inverted approach achieves the same visual effect of non-uniform dyeing without the harmful decolouring processes that damage delicate fibers

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The invention uses permeable granules impregnated with dye-inert substance as an intermediary carrier. These granules transfer the dye-inert substance to the textile surface, creating protective zones that prevent dye absorption without requiring direct contact between aggressive chemicals and the textile fibers

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If bleaching treatments and mechanical abrading action are used to create ageing effect, then non-uniform dyeing is achieved, but the textile structure is weakened and lifespan is reduced

Engineering Contradiction:

Improveageing effectVSAvoidtextile fiber strength

Core Design Contradiction:

Manufacturing precisionVSStrength

Solution Approach 1:

The invention applies dye-inert substance to predetermined zones before the dyeing process. This preliminary action creates protective barriers that prevent dye penetration in specific areas, achieving the ageing effect without subsequent mechanical abrasion or structural weakening

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention replaces mechanical abrading action with chemical prevention. Instead of physically removing material through abrasion to create ageing effects, the dye-inert substance chemically prevents dye binding in predetermined zones, achieving the same visual result without mechanical damage

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Manufacturing precision

If aggressive chemical agents are used for decolouring, then the desired discolouring effect is obtained, but the chemical composition of the textile is altered and fibers are degraded

Engineering Contradiction:

Improvediscolouring effectVSAvoidtextile fiber composition

Core Design Contradiction:

Manufacturing precisionVSStability of the object's composition

Solution Approach 1:

Instead of using aggressive chemicals to remove dye (decolouring), the invention uses dye-inert substance to prevent dye binding in the first place. This inverted chemical approach achieves discolouring effects while maintaining the original fiber composition and stability

Inventive Principle:

Principle #13The other way round (Inversion)

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 allows for the creation of non-uniform dyeing effects on textiles without damaging delicate fibers, extending their lifespan and eliminating the need for harsh chemicals, while maintaining the natural appearance of wear and tear.

Implementation Method 1

permeable granules which have been first impregnated with a dye-inert substance in solution form

Methodology Applied

Scientific EffectAdsorption: Adsorption

Implementation Method 2

The granules are then brought into contact with the textile products in a drum, rotated at a speed such as to ensure that the liquid is released from the granules

Methodology Applied

Scientific EffectDiffusion: Diffusion

Data Source

PatentEP1979531B1A process for non-uniform dyeing of textile products

Publication Date: 2016.02.24 TINTORIA EMILIANA

AI summary

A process for non-uniform dyeing of textile products, comprising following stages: - arranging the textile products to be dyed in a chamber together with a plurality of permeable and absorbent granules impregnated with an inertizing liquid substance for rendering the textile to be dyed at least partially inert to dyeing; - bringing the textile products to be dyed into contact with the granules, the granules and the textile products being moved together in a relatively random way, for a sufficient amount of time to wet parts of the textile of the textile products with the inertizing substance; then - separating the textile products from the granules; - bringing the textile products to a temperature and for a sufficient amount of a time to cause the inertizing substance to react with the parts of the textile which were dampened with the substance; and finally - dyeing the textile products.