Multi-Chamber Detergent Dosing for Low-Temperature Washing

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Solution Overview

Problem

Current washing machine detergents face limitations in improving washing performance, especially in low-temperature wash cycles with reduced water consumption, due to ecological and economic constraints on the use of new ingredients, and existing dosing systems lack efficiency in delivering multiple preparations during washing programs.

Innovation Solution

A dosing system with a multi-chamber cartridge and sensor-activated dosing device that releases different preparations, such as enzyme proteins, bleaches, and fragrances, at optimal times during the washing cycle, ensuring efficient use of resources and enhanced washing performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple detergent ingredients are added to improve washing performance, then washing performance is improved, but the amount of ingredients used increases which conflicts with ecological and economic constraints

Engineering Contradiction:
Improvewashing performanceVSAvoidamount of ingredients used
Core Design Contradiction:
ReliabilityVSQuantity of substance

Solution Approach 1:

The detergent system is divided into multiple chambers (first chamber with enzymes/surfactants at pH 6-8, second chamber with bleach/complexing agents at pH 8-12, third chamber with fragrances/optical brighteners at pH 6-8 or 1-3), each containing different functional ingredients that are released at different times during the wash cycle. This segmentation allows concentrated use of fewer ingredients rather than diluting multiple ingredients throughout, resolving the contradiction between washing performance and ingredient quantity.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The dosing device releases preparations from different chambers at different times during the wash cycle (first chamber dosed when water presence detected, second chamber after predefined time interval, third chamber with delayed dosing). This preliminary timing strategy ensures each ingredient is released at its optimal moment for maximum effectiveness, improving washing performance while minimizing total ingredient usage.

Inventive Principle:
Principle #10Preliminary action

2Productivity

If a multi-chamber cartridge system is implemented to dose different preparations, then dosing efficiency is improved, but device complexity increases

Engineering Contradiction:
Improvedosing efficiencyVSAvoiddosing system structure
Core Design Contradiction:
ProductivityVSDevice complexity

Solution Approach 1:

Multiple dosing functions are merged into a single integrated dosing device that handles all three chambers. The device includes a common dosing mechanism with sensors and control logic that coordinates release from all chambers through one unit rather than requiring separate dosing mechanisms for each chamber, thereby improving dosing efficiency while limiting the increase in device complexity.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The dosing device is designed as a multi-functional unit that can detect water presence, control timing intervals, and manage release from multiple chambers with different pH requirements. This universal design allows one device to perform multiple dosing functions that would otherwise require separate systems, balancing productivity improvement with acceptable device complexity.

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

The system achieves excellent washing performance with minimal raw material usage, providing effective enzymatic cleaning, bleaching, and fragrance distribution, while allowing for targeted and efficient dosing of detergent components.

Implementation Method 1

The dosing device comprises at least one sensor which is suitable for detecting the presence of water inside the washing machine. The dosing device particularly preferably comprises a conductivity sensor and/or temperature sensor.

Methodology Applied
Scientific EffectConductivity sensing: Conduction (electrical)

Implementation Method 2

the first chamber stores at least one enzyme protein

Methodology Applied
Scientific EffectEnzymatic degradation: Enzyme

Implementation Method 3

the first chamber stores at least one enzyme protein, an enzyme stabilizer and a surfactant

Methodology Applied
Scientific EffectSurfactant action: Surfactant

Implementation Method 4

the second chamber at least one Bleach, a complexing agent is stored

Methodology Applied
Scientific EffectOxidation: Oxidation

Implementation Method 5

the second chamber at least one Bleach, a complexing agent is stored

Methodology Applied
Scientific EffectComplexation: Chemical Bonding

Data Source

PatentEP2521811B1Metering system for releasing at least three different preparations during a washing programme of a washing machine
Publication Date: 2015.03.18 HENKEL KGAA
  • EP2521811B1 patent drawingFigure 1
  • EP2521811B1 patent drawingFigure 2
  • EP2521811B1 patent drawingFigure 3

AI summary

The invention relates to a metering system for releasing preparations in the interior of a washing machine, comprising at least a metering device and at least one cartridge that can be coupled to the metering device, wherein the cartridge comprises at least three chambers containing flowable preparations that differ from one another. According to the invention, the first chamber stores at least one enzyme protein, an enzyme stabilizer and a surfactant having a pH value ranging from 6-8, the second chamber stores at least one bleach, a complexing agent having a pH value ranging from 8-10, and the third chamber stores at least one fragrance and/or an optical brightener having a pH value ranging from 6-8.