Water-Soluble Detergent Pod Film Composition for Cold-Wash Dissolution
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Solution Overview
Problem
Existing water-soluble unit dose articles face issues with seal failures between films and incomplete dissolution during short and cold wash cycles, leading to structural integrity and dissolution profile problems.
Innovation Solution
A water-soluble unit dose article comprising a blend of polyvinyl alcohol homopolymer and anionic polyvinyl alcohol copolymer in the films, with a specific weight ratio and solvent sealing to ensure homogeneous sealing, reducing seal failures and enhancing dissolution under environmentally friendly wash conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a water-soluble film is used to provide structural integrity during storage and transport, then the film strength is improved, but the film may not dissolve adequately during short and cold wash cycles resulting in residue
Solution Approach 1:
The patent applies parameter changes by using polyvinyl alcohol with specific viscosity characteristics (4% solution viscosity between 8-12 mPa.s at 20°C) and controlled composition (less than 15% carboxylated anionic monomer units) to achieve both sufficient film strength and reliable dissolution under varied wash conditions
Solution Approach 2:
The patent uses composite materials by combining polyvinyl alcohol homopolymer with carboxylated anionic monomer units in a controlled ratio to create a film that exhibits both mechanical strength and enhanced dissolution properties
2Strength
If the film is made stronger to prevent tearing, then structural integrity is improved, but seal failures may still occur due to stress concentration at seal locations
Solution Approach 1:
The patent applies local quality by using solvent sealing technology that creates localized strong bonds at the seal locations between film layers, concentrating the sealing action where needed while maintaining overall film strength and flexibility
3Productivity
If a higher proportion of polyvinyl alcohol homopolymer is used to improve dissolution, then dissolution speed is improved, but film strength may be reduced
Solution Approach 1:
The patent optimizes the parameter of polyvinyl alcohol composition by controlling the proportion of homopolymer (85-100%) and carboxylated anionic monomer units (<15%) to achieve the right balance between film strength and dissolution performance
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 provides reduced seal failures and maintains structural integrity while ensuring complete dissolution of the unit dose article, even under short and cold wash cycles.
Implementation Method 1
when the water-soluble unit dose article is added to water, the film dissolves/disintegrates releasing the internal contents into the surrounding water
Implementation Method 2
seal the first and second water-soluble films together to create the water-soluble unit dose article
Data Source
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AI summary
Water-soluble unit dose article comprising a laundry or automatic dishwashing detergent and a method of making.