Thin-Glass Multilayer Structure With Low-Waviness Adhesive Interface
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Solution Overview
Problem
Multilayer structures with a thin glass layer laminated on a resin layer experience reduced visibility due to the lower layer being visible through the glass, which affects quality, especially in applications requiring a mirror finish or decorative plates.
Innovation Solution
A multilayer structure with a glass layer thickness of 10 μm to 300 μm and an arithmetic mean waviness of the resin-adhesive interface of 10 μm or less, ensuring improved planarity and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a thin glass layer is laminated on a resin layer through an adhesive layer, then the multilayer structure achieves lightness and flexibility, but visibility through the glass layer is reduced
Solution Approach 1:
The patent specifies precise parameter ranges: glass layer thickness of 5-300 μm and adhesive layer thickness of 1-50 μm. By optimizing these dimensional parameters, the invention achieves a balance between maintaining lightness/flexibility and ensuring sufficient visibility through the glass layer, resolving the contradiction between weight reduction and visual quality
Solution Approach 2:
The patent applies local quality control by specifying that the arithmetic mean waviness Wa of the resin layer surface must be 10 μm or less. This local surface quality requirement ensures that light passes through uniformly without distortion, improving visibility while maintaining the overall thin-structure benefits of lightness and flexibility
2Adaptability or versatility
If the glass layer thickness is reduced to improve flexibility, then lightness and flexibility are enhanced, but the lower layer becomes more visible through the glass, reducing quality
Solution Approach 1:
The patent establishes a specific thickness range of 5-300 μm for the glass layer, which is thin enough to provide flexibility and lightness but thick enough to maintain adequate visibility. This parameter optimization resolves the contradiction between flexibility and visual quality
Solution Approach 2:
By controlling the local surface quality of the resin layer (Wa ≤ 10 μm), the patent ensures that even with thin glass layers, the underlying structure does not create visible distortions, thereby maintaining quality appearance while achieving the desired flexibility
3Manufacturing precision
If the resin layer surface is made smoother to improve visibility, then manufacturing precision increases, but the adhesive bonding may be affected
Solution Approach 1:
The patent specifies an optimal range for surface waviness (Wa ≤ 10 μm) that balances optical quality with adhesive bonding performance. This parameter control ensures sufficient smoothness for good visibility while maintaining adequate surface characteristics for reliable adhesive bonding
Solution Approach 2:
The invention applies local quality control to the resin layer surface, ensuring that only the region in contact with the adhesive layer meets the Wa ≤ 10 μm requirement. This localized quality control improves visibility without necessarily affecting the overall structural integrity or bonding reliability
Data Source
AI summary
A multilayer structure includes a resin layer, and a glass layer laminated on the resin layer via an adhesive layer, wherein a thickness of the glass layer is 10 μm or more and 300 μm or less, and an arithmetic mean waviness Wa of an interface of the resin layer and the adhesive layer is 10 μm or less.