Deionized Laundry Washing to Prevent Dye Transfer Without Sorting

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Solution Overview

Problem

Conventional laundry washing methods require time-consuming color sorting to prevent dye bleeding, which is prone to errors and inconvenient for consumers, and no method has effectively eliminated the need for sorting while minimizing dye transfer.

Innovation Solution

A method using partially deionized water, produced through nanofiltration, electrodeionization, or capacitive deionization, combined with anti-redeposition agents and cleaning compositions, to reduce the specific conductance below 200 μS/cm, allowing for washing without color sorting by minimizing dye deposition and maintaining color fidelity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If laundry is sorted by color to prevent dye bleeding, then color fidelity is improved, but loss of time and ease of operation deteriorate due to manual sorting burden

Engineering Contradiction:

Improvecolor fidelityVSAvoidsorting time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The patent extracts and removes metal ions from water through deionization processes (nanofiltration, reverse osmosis, ion exchange) to create metal-ion-free water. This extracted pure water is then used in the washing process to prevent metal-catalyzed dye transfer, eliminating the need for color sorting while maintaining color fidelity.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the chemical parameter of water by reducing metal ion concentration to below detectable levels (specific conductance <200 μS/cm). This parameter change transforms ordinary water into a protective washing medium that prevents dye bleeding without requiring manual sorting by color.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If conventional water is used for washing, then ease of operation is improved, but object-generated harmful factors worsen due to metal ion catalyzed dye transfer

Engineering Contradiction:

Improvewashing convenienceVSAvoiddye transfer

Core Design Contradiction:

Ease of operationVSObject-generated harmful factors

Solution Approach 1:

The patent converts the naturally occurring metal ions in water, which normally catalyze dye transfer, into a benefit by systematically removing them. The deionization process transforms ordinary water containing harmful metal ions into protective pure water that actively prevents dye bleeding, allowing convenient washing of mixed colors without dye transfer problems.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Object-generated harmful factors

If deionization processes are implemented, then dye transfer is reduced, but device complexity and use of energy increase

Engineering Contradiction:

Improvedye transferVSAvoidwater treatment system

Core Design Contradiction:

Object-generated harmful factorsVSDevice complexity

Solution Approach 1:

The patent implements a multi-functional water treatment system where nanofiltration, reverse osmosis, and ion exchange processes work together to simultaneously remove various types of impurities (particulates, organic compounds, metal ions) from water. This universal approach creates a single treated water stream that addresses all dye transfer mechanisms without requiring separate treatment systems for each contaminant type.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 cleaning efficacy, reduces the need for color sorting, and prevents dye transfer, maintaining the brightness and color integrity of fabrics by reducing interactions with metal ions and particulate soils, applicable for both residential and commercial laundry.