White Laundry Bleach Sequencing to Prevent Yellowing and Odor
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Solution Overview
Problem
Current laundry methods for white loads using bleach often result in yellowing of synthetic fibers and unpleasant odors, with existing solutions not effectively addressing soil removal and environmental concerns.
Innovation Solution
A method involving multiple washing steps with the delivery of bleach followed by a whitening additive, preferably containing a bleach scavenger like sodium thiosulfate, to maintain whiteness and eliminate odors, while reducing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If halogen bleach is used to remove stains, then stain removal is improved, but fabric whiteness deteriorates and yellowing occurs
Solution Approach 1:
A whitening additive is introduced as an intermediary substance between the halogen bleach and the fabric. This additive contains agents that prevent the harmful yellowing effect while allowing the bleach to perform its stain removal function. The whitening additive acts as a mediator that protects the fabric from the harmful side effects of bleach exposure.
Solution Approach 2:
The harmful yellowing effect is extracted or separated from the beneficial stain removal function. By using a whitening additive that specifically targets and prevents yellowing, the harmful effect is isolated and counteracted independently from the bleaching action, allowing stain removal to proceed without the accompanying yellowing problem.
2Productivity
If halogen bleach is used for cleaning, then stain removal is improved, but unpleasant odour is generated
Solution Approach 1:
The whitening additive serves as an intermediary that interacts with the bleach to modify its properties. This additive contains components that neutralize or mask the unpleasant bleach odour while preserving the oxidative stain removal capability. The intermediary substance transforms the sensory characteristics of the bleach without compromising its cleaning function.
3Stability of the object's composition
If multiple washing steps are used with bleach and whitening additive, then whiteness maintenance is improved, but process complexity increases
Solution Approach 1:
The functions of stain removal and whiteness protection are merged into a single integrated washing process by combining bleach and whitening additive in the same wash cycle. This eliminates the need for separate treatment steps, reducing process complexity while maintaining effective whiteness maintenance. The multiple functions are accomplished simultaneously through the combined action of the two substances.
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 method provides effective stain removal, maintains fabric whiteness, eliminates bleach odors, and reduces environmental bleach discharge, particularly effective for synthetic materials prone to yellowing.
Implementation Method 1
The whitening additive comprises a bleach scavenger like sodium thiosulfate
Implementation Method 2
the whitening additive comprising a hueing dye or brightener to improve environmental impact
Data Source
AI summary
Method of cleaning a white load in a laundry machine, preferably a professional laundry machine, the method comprises subjecting the load to at least two washing steps and wherein the method comprises the steps of delivering bleach and subsequently a whitening additive.