Dishwasher Pouch Release Timing for Tea Stains in Hard Water
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Solution Overview
Problem
Automatic dishwashing methods face challenges in effectively removing tea stains, especially in hard water with high bicarbonate levels, and short cycles, which compromise cleaning efficiency and shine.
Innovation Solution
A method utilizing a water-soluble pouch with a phosphate-free cleaning composition that includes a bleach catalyst and complexing agent, where the bleach catalyst is delivered initially and the complexing agent is slowly released throughout the cycle, optimizing tea stain removal across varying water hardness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a phosphate-free cleaning composition with bleach catalyst and complexing agent is used, then tea stain removal is improved, but cleaning efficiency deteriorates in hard water with high bicarbonate levels
Solution Approach 1:
The bleach catalyst is delivered at the beginning of the cleaning cycle (at least 90% by weight delivered in less than 1/10 t) to initiate tea stain removal before the complexing agent is released. This preliminary action ensures that the bleach catalyst can work effectively on tea stains without being prematurely complexed by hardness ions, while the complexing agent is slowly delivered throughout the cycle to maintain cleaning efficiency in hard water conditions
Solution Approach 2:
The invention uses a dynamic delivery system where the release timing of different components varies during the cleaning cycle. The bleach catalyst is delivered early (at least 90% in less than 1/10 t) while the complexing agent is slowly delivered throughout the cycle (at least 20% delivered later than 1/3 t). This dynamic temporal separation allows each component to perform its optimal function at the appropriate time, resolving the contradiction between tea stain removal and cleaning efficiency in hard water
2Reliability
If the complexing agent is delivered early in the cycle, then water hardness is controlled, but tea stain removal deteriorates due to premature complexation of bleach catalyst
Solution Approach 1:
The bleach catalyst is delivered at the beginning of the cleaning cycle (at least 90% by weight delivered in less than 1/10 t) before the complexing agent is significantly released. This preliminary action allows the bleach catalyst to work on tea stains without being complexed by the complexing agent, ensuring effective tea stain removal while the complexing agent is slowly delivered throughout the cycle to control water hardness
Solution Approach 2:
The invention implements a dynamic delivery sequence where the bleach catalyst is released early (at least 90% in less than 1/10 t) and the complexing agent is released slowly throughout the cycle (at least 20% delivered later than 1/3 t). This temporal dynamic separation prevents premature complexation of the bleach catalyst by the complexing agent, allowing both functions to perform optimally at different times during the cycle
3Use of energy by moving object
If short washing cycles are used for energy saving, then energy consumption is reduced, but tea stain removal becomes more challenging
Solution Approach 1:
The bleach catalyst is delivered at the beginning of the cleaning cycle (at least 90% by weight delivered in less than 1/10 t) to immediately initiate tea stain removal. This preliminary action allows the bleaching process to start right away, making effective tea stain removal possible even in shortened washing cycles where there is less total time available for cleaning operations
Solution Approach 2:
The invention changes the temporal parameters of component delivery to optimize performance in short cycles. By delivering at least 90% of the bleach catalyst in less than 1/10 t and at least 20% of the complexing agent later than 1/3 t, the system maximizes the effectiveness of each component within the limited time available, enabling effective tea stain removal in energy-efficient short washing cycles
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 achieves improved tea stain removal and overall cleaning efficiency, maintaining item shine even in hard water conditions, by controlling the release of cleaning agents to prevent premature complexation and ensure effective bleaching and detachment of stains.
Implementation Method 1
The composition comprises a complexing agent, bleach and a bleach catalyst
Implementation Method 2
the bleach catalyst is delivered initially and the complexing agent is slowly released throughout the cycle, optimizing tea stain removal
Implementation Method 3
The composition comprises a complexing agent, bleach and a bleach catalyst
Data Source
AI summary
A method of cleaning soiled ware in a dishwasher the method comprising the step of using a water-soluble pouch, the pouch comprising a phosphate-free cleaning composition wherein the cleaning composition comprises loose powder and the composition comprises bleach, metal bleach catalyst and a complexing agent and wherein the complexing agent is slowly released as compared to the bleach catalyst.