Laundry Treating Chemistry for Mixed-Load Dye Transfer Inhibition
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Solution Overview
Problem
Residential laundry settings face challenges in preventing dye transfer between mixed or unsorted fabric items during washing, as existing methods require time-consuming sorting and are inefficient, and consumers lack control over fabric types and dye treatments.
Innovation Solution
A method involving the use of a dye transfer inhibitor (DTI) in a laundry treating appliance, which includes introducing a dye fixative or absorber to inhibit dye partitioning and redistribution, allowing for the washing of unsorted loads with minimal dye transfer through controlled application of treating chemistries and cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If laundry items are sorted into loads of like color before washing, then dye transfer between items is reduced, but the laundry process becomes time-consuming and inefficient
Solution Approach 1:
A dye transfer inhibitor composition is introduced as an intermediary substance between the dyed fabric items and the wash water. This composition contains polymers with both hydrophobic and hydrophilic regions that bind to excess dyes on fabric surfaces, forming complexes that prevent dye migration to other items. The inhibitor acts as a mediator that captures free dyes in the wash solution, allowing unsorted mixed loads to be washed without dye transfer problems.
Solution Approach 2:
The dye transfer inhibitor composition is applied to the laundry load before washing begins. The composition pre-treats the fabric surfaces by binding to excess dyes and creating a protective layer that prevents dye release during the wash cycle. This preliminary action eliminates the need for sorting, as the protective effect is established before the items come into contact with each other in the wash.
2Object-affected harmful factors
If dye transfer inhibitor composition is applied to fabric items, then dye migration is prevented, but the complexity of the laundry process increases
Solution Approach 1:
The dye transfer inhibitor composition integrates multiple functions into a single product: it binds excess dyes, prevents dye migration, and can be applied through existing laundry appliance dispensing systems. The composition works with standard washing machines and dryers without requiring specialized equipment, maintaining process simplicity while providing comprehensive dye transfer protection.
Solution Approach 2:
The dye transfer inhibitor composition is designed to be self-applying through the wash cycle. It is introduced into the wash water or applied to fabrics before washing, where it automatically binds to excess dyes on fabric surfaces through molecular interactions. The composition performs its protective function autonomously during the normal wash process without requiring additional manual intervention or complex application procedures.
3Reliability
If polymers with hydrophobic and hydrophilic regions are used to bind dyes, then dye binding effectiveness is improved, but the cost of treating chemistries increases
Solution Approach 1:
The dye transfer inhibitor composition utilizes polymers with specific amphiphilic characteristics - containing both hydrophobic regions for binding to nonpolar dye molecules and hydrophilic regions for solubility in wash water. The polymer structure, molecular weight, and composition parameters are optimized to achieve effective dye binding at low concentrations. This allows reliable dye transfer prevention while controlling the quantity and cost of treating chemistry required.
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
Enables the laundering of mixed loads with minimal dye transfer between fabric items and surfaces, reducing the risk of dye bleeding and ruining items, while eliminating the need for time-consuming sorting and improving laundry efficiency.
Implementation Method 1
The composition may include polymers having both hydrophobic and hydrophilic regions that may bind to excess dyes on fabric surfaces and in the wash solution
Implementation Method 2
The composition may include polymers having both hydrophobic and hydrophilic regions that may bind to excess dyes on fabric surfaces
Data Source
AI summary
A method of treating laundry in a laundry treating appliance having a treating chamber for receiving the laundry for treatment according to an automatic cycle of operation implemented by a controller of the laundry treating appliance includes receiving by the controller an input indicative of the laundry comprising at least one new laundry item.