Whitening Additive for Laundry Yellowing Prevention
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Solution Overview
Problem
Professional laundry processes face challenges in maintaining whiteness and reducing water usage while minimizing packaging and transport emissions, especially under heavy soil conditions and with the use of bleach, which can cause yellowing of fabrics.
Innovation Solution
A process involving the use of a detergent and a whitening additive comprising a soil release polymer and a hueing dye, with optional brightener, delivered separately in a laundry process that includes a single rinse step, reducing water consumption and preventing fabric yellowing, and a concentrated whitening additive composition that minimizes surfactant and perfume content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional laundry process with multiple rinse steps is used, then cleaning effectiveness is improved, but water consumption and energy usage increase
Solution Approach 1:
The invention extracts and eliminates unnecessary rinse steps from the conventional laundry process. By using a whitening additive that combines soil release polymer, hueing dye, and brightener, the patent achieves effective cleaning and whitening in a single wash cycle without requiring multiple rinses, thereby reducing water consumption and energy usage while maintaining cleaning effectiveness
Solution Approach 2:
The invention changes the chemical parameters of the laundry process by introducing a specialized whitening additive with specific components (soil release polymer, hueing dye, brightener) and optimizing their concentrations. This parameter change enables effective cleaning and whitening to be achieved in fewer wash cycles, reducing the overall number of rinses needed and consequently reducing water and energy consumption
2Reliability
If bleach is used to maintain whiteness, then whiteness maintenance is improved, but fabric yellowing occurs
Solution Approach 1:
The invention introduces a whitening additive as an intermediary substance that mediates between the desired whiteness maintenance and the harmful effect of fabric yellowing. This additive, containing soil release polymer, hueing dye, and brightener, provides whitening and stain removal effects without the harsh effects of traditional bleach, thereby preventing fabric yellowing while maintaining whiteness
Solution Approach 2:
The invention converts the harmful effect of bleach-induced yellowing into a benefit by using alternative whitening agents (soil release polymer, hueing dye, brightener) that provide whiteness maintenance without causing fabric damage. The hueing dye specifically counteracts yellowing by depositing a blue tint, transforming the problem of fabric yellowing into a solved issue through chemical compensation
3Loss of substance
If concentrated additive composition is used, then packaging and transport emissions are reduced, but formulation complexity increases
Solution Approach 1:
The invention merges multiple functional components (soil release polymer, hueing dye, and brightener) into a single concentrated additive composition. This consolidation reduces the number of separate products needed, thereby reducing packaging volume and transport emissions. The combining of these functions into one formulation achieves the desired whitening and stain removal effects while minimizing environmental impact
Solution Approach 2:
The invention creates a composite additive formulation that integrates multiple active ingredients (soil release polymer, hueing dye, brightener) in specific proportions within a single concentrated product. This composite material approach allows for reduced packaging and transport emissions compared to separate products, while the formulation complexity is managed through optimized composition design
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
The process achieves effective stain removal, whiteness maintenance, and whiteness rejuvenation even with a single rinse, while reducing water and energy usage and preventing fabric yellowing, and the concentrated additive composition offers improved environmental benefits by reducing packaging and transport emissions.
Implementation Method 1
The whitening additive comprises: (a) a soil release polymer
Implementation Method 2
The whitening additive comprises: (b) a hueing dye
Implementation Method 3
The whitening additive comprises: (c) optionally a brightener
Implementation Method 4
The process achieves effective stain removal, whiteness maintenance, and whiteness rejuvenation
Data Source
AI summary
A process of laundering fabrics, comprising the step of separately delivering a detergent and a whitening additive wherein the whitening additive comprises a soil release polymer, a hueing dye, and wherein if the whitening additive comprises a surfactant, the weight ratio of the polymer to the surfactant is at least 1:1, the whitening additive is substantially free of surfactant.