Water-Soluble Multicompartment Detergent Pouch Seal Integrity
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Solution Overview
Problem
Superposed or mixed side-by-side/superposed pouch configurations in water-soluble unit dose articles face challenges in securing high seal quality due to the increased risk of seal failures when multiple films are sealed together, leading to potential detergent leakage.
Innovation Solution
A water-soluble multicompartment unit dose article using a polyvinyl alcohol resin-based film that surrounds liquid detergent compositions in compartments, with a specific design that includes a flange area and multiple layers of sealed film to enhance seal strength and reduce stress on the seal area, thereby minimizing the risk of leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple films are sealed together in superposed or mixed configurations, then the compartmentalization and detergent containment capability are improved, but the seal strength and reliability deteriorate due to increased risk of seal failures
Solution Approach 1:
The patent merges multiple film layers into a single integrated water-soluble film structure. Instead of sealing multiple separate films together (which creates multiple potential failure points), the invention uses one or more continuous water-soluble film layers that are formed and sealed as unified structures, eliminating the cumulative seal failure risk while maintaining multi-compartment functionality.
Solution Approach 2:
The patent segments the detergent composition into multiple compartments within a single water-soluble film structure. This allows the film to be divided into functional zones (different compartments containing different detergent components) without requiring multiple separate films to be sealed together, thus achieving compartmentalization without compromising seal integrity.
2Volume of moving object
If multiple compartments are positioned in superposed configuration, then the compactness and space utilization are improved, but the seal strength deteriorates due to increased stress concentration on sealed areas
Solution Approach 1:
The patent applies local quality by optimizing the seal area design in specific locations. The seal areas are engineered with enhanced properties (such as increased film thickness or modified material composition in sealed regions) to withstand the stress concentration that occurs in superposed configurations, while the non-seal areas maintain their original compact structure.
Solution Approach 2:
The patent incorporates cushioning elements or stress-distributing structures in the seal areas before the actual sealing process. These pre-positioned features (such as flange areas with increased surface area or integrated buffer zones) distribute the mechanical stress that will occur during handling and washing, preventing seal failure while maintaining the compact superposed configuration.
3Reliability
If flange area and multiple layers of sealed film are added to enhance seal strength, then the seal quality is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent designs the water-soluble film structure to serve multiple functions simultaneously. The flange areas and sealed layers are integrated into the film formation process itself, creating structures that provide both containment and stress distribution functions without requiring separate manufacturing steps. This multi-functional design simplifies manufacturing while achieving enhanced seal quality.
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 solution effectively improves seal quality and reduces seal failures, ensuring the detergent remains contained during storage and releases properly upon contact with water, enhancing the reliability and efficiency of the unit dose article.
Implementation Method 1
The water-soluble film comprises polyvinyl alcohol resin and wherein the polyvinyl alcohol resin consists of a homopolymer
Data Source
AI summary
The present invention relates to a water-soluble, multicompartment unit dose article comprising at least two superposed compartments, wherein the compartments are formed by sealing water soluble film to contain liquid detergent composition. The water-soluble film comprises polyvinyl alcohol polymer comprising polyvinyl alcohol resin and wherein the polyvinyl alcohol resin comprises an homopolymer. The total volume of the liquid detergent composition is from 10 ml to 20 ml.