Low Permeability Packaging Bag for PVA Resin Storage Stability
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Solution Overview
Problem
Polyvinyl alcohol-based resins with modified groups having active hydrogen undergo crosslinking reactions due to moisture absorption, leading to insoluble matters when converted into aqueous solutions, which hinders their development into various applications.
Innovation Solution
A packaging bag with a film having a water vapor permeability of 10 g/m2/day or less is used for hermetic sealing and packaging, suppressing humidity absorption and thereby preventing crosslinking reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional packaging bag made of polyethylene terephthalate is used, then water leakage prevention is achieved, but moisture absorption occurs leading to crosslinking reactions and insoluble matter formation
Solution Approach 1:
The patent changes the water vapor permeability parameter of the packaging film from conventional levels (allowing moisture transmission) to a specific low level (10 g/m2/day or less). This parameter change prevents moisture absorption by the PVA-based resin while maintaining water leakage prevention, thereby suppressing crosslinking reactions and insoluble matter formation during storage
Solution Approach 2:
The patent employs a composite packaging structure consisting of multiple layers with different functions: a water vapor barrier layer (providing low water vapor permeability), a substrate layer (providing mechanical strength), and optionally a heat seal layer. This composite structure simultaneously achieves water leakage prevention and moisture absorption prevention, resolving the contradiction between conventional water protection and storage stability
2Stability of the object's composition
If hermetic sealing is implemented to prevent moisture absorption, then crosslinking reactions are suppressed, but packaging complexity increases
Solution Approach 1:
Instead of implementing complex hermetic sealing structures, the patent achieves moisture protection by changing the intrinsic water vapor permeability parameter of the packaging material itself to 10 g/m2/day or less. This material parameter change provides passive moisture barrier protection without requiring complex sealing mechanisms, thus suppressing crosslinking reactions while maintaining packaging simplicity
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
This approach improves the storage stability of polyvinyl alcohol-based resins by reducing insoluble matter content in aqueous solutions, even after long-term storage, making them suitable for various applications.
Implementation Method 1
a film having a water vapor permeability of 10 g/m2/day or less
Data Source
AI summary
A packaging bag for packaging a polyvinyl alcohol-based resin that contains a modified group having active hydrogen, the packaging bag including a film having a water vapor permeability of 10 g/m2/day or less. Accordingly, when a polyvinyl alcohol-based resin that contains a modified group having active hydrogen is packaged with the packaging bag, the storage stability of the polyvinyl alcohol-based resin that contains a modified group having active hydrogen can be improved, and hence an aqueous solution of the polyvinyl alcohol-based resin that contains a modified group having active hydrogen, the solution being reduced in insoluble matter content, can be obtained even after long-term storage thereof.