Laminated Mounting Base Material for Flexible Moisture Barriers
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Solution Overview
Problem
Existing hygroscopic sheets and moisture barrier laminates fail to maintain electronic devices in a dry state for an extended period due to moisture permeation and lack of flexibility, especially when subjected to bending stresses.
Innovation Solution
A base material comprising a metal foil, a hygroscopic layer, and a barrier sheet, where the metal foil blocks initial moisture ingress, the hygroscopic layer absorbs trace moisture, and the barrier sheet further prevents permeation, with a quasi-hygroscopic layer enhancing flexibility and resistance to bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thick organic layer is used to diffuse moisture, then moisture barrier properties are improved, but flexibility deteriorates
Solution Approach 1:
The base material is divided into multiple functional layers: a metal foil layer for initial moisture blocking, a hygroscopic layer for absorbing trace moisture, and a barrier sheet with inorganic barrier layer for additional protection. This segmentation allows each layer to perform its specific function optimally without requiring a single thick organic layer, thereby maintaining flexibility while achieving excellent moisture barrier properties.
Solution Approach 2:
The invention uses a composite structure combining metal foil (aluminum), organic hygroscopic resin, and inorganic barrier layers. This composite material approach leverages the advantages of each material: the metal foil provides immediate moisture blocking and flexibility, the hygroscopic resin absorbs trace moisture, and the inorganic barrier layer provides long-term moisture resistance, achieving both flexibility and superior moisture barrier properties.
2Reliability
If a hygroscopic sheet with desiccant is used for moisture absorption, then moisture prevention is improved, but service life deteriorates due to rapid saturation
Solution Approach 1:
The metal foil layer is positioned to perform preliminary moisture blocking before moisture reaches the hygroscopic layer. This preliminary action prevents large amounts of moisture from immediately saturating the desiccant, allowing the hygroscopic layer to operate more efficiently and extend its service life by only absorbing trace moisture that penetrates the metal foil.
Solution Approach 2:
The barrier sheet with inorganic barrier layer is added to provide beforehand cushioning against moisture infiltration. This additional barrier layer reduces the moisture load on the hygroscopic layer, preventing rapid saturation and extending the overall service life of the moisture prevention system.
3Ease of manufacture
If plastic base material is used for mounting, then ease of manufacture is improved, but moisture barrier properties deteriorate under bending stress
Solution Approach 1:
The base material is segmented into multiple layers with distinct functions: metal foil for flexibility and initial blocking, hygroscopic layer for moisture absorption, and inorganic barrier layer for sustained moisture resistance. This segmentation allows the use of thin, flexible materials that can withstand bending stress while maintaining effective moisture barrier properties.
Solution Approach 2:
The invention creates a composite base material structure combining metal foil, organic resin, and inorganic barrier layers. This composite structure maintains the ease of manufacture associated with plastic materials while dramatically improving moisture barrier properties even under bending stress, as the metal foil and inorganic layers provide robust moisture protection that plastic alone cannot achieve.
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 base material effectively maintains electronic devices in a dry state by blocking and absorbing moisture, ensuring long-term protection and flexibility, even under stress conditions.
Implementation Method 1
the metal foil blocks initial moisture ingress
Implementation Method 2
the hygroscopic layer absorbs trace moisture
Implementation Method 3
the barrier sheet further prevents permeation
Data Source
AI summary
A base material for mounting an electronic device, the base material including a metal foil, a hygroscopic layer, and a barrier sheet laminated in this order, in which the metal foil has a thickness of from 5 to 20 μm.