Laminated Glass Interlayer with Recessed Outer Layer
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Solution Overview
Problem
In laminated glass production, interlayer films with multiple resin layers, including a colored layer, often exhibit poor appearance due to surface recesses that are transferred during pressure bonding, leading to linear color unevenness, while ensuring deaeration properties is crucial for bubble removal between glass plates and the interlayer film.
Innovation Solution
An interlayer film with a laminated structure featuring four or more layers, including an outer layer with recesses on its surface and a colored layer, where the recesses are spaced with a minimum distance of 150 µm or more from the colored layer, ensuring excellent deaeration properties and preventing poor appearance by maintaining a smooth interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If recesses are formed on the surface of the interlayer film to ensure deaeration properties, then deaeration properties are improved, but linear color unevenness occurs in the colored portion causing poor appearance
Solution Approach 1:
The interlayer film is divided into multiple resin layers (first resin layer, second resin layer, colored layer) with the colored layer positioned between them. The recesses are formed only on the outer surface of the first resin layer, while the interface between layers remains smooth. This segmentation allows the deaeration function to be localized to the outer surface while protecting the colored layer interface from deformation.
Solution Approach 2:
The recesses are strategically positioned only on the outer surface of the first resin layer at a distance of 10 µm or more from the interface with the colored layer. This local placement ensures that the deaeration function is provided where needed (at the glass-interlayer interface) while the colored layer interface maintains smoothness for good appearance.
2Adaptability or versatility
If multiple resin layers including a colored layer are stacked to achieve various properties, then functional versatility is improved, but linear color unevenness occurs causing poor appearance
Solution Approach 1:
The multilayer structure is segmented such that the colored layer is sandwiched between a first resin layer and a second resin layer. The recesses are formed only on the outer surface of the first resin layer, keeping the colored layer interface smooth. This segmentation allows functional versatility through layer differentiation while preventing appearance defects.
Solution Approach 2:
The first and second resin layers act as intermediary protective layers that shield the colored layer from the deformation caused by recess formation. These intermediary layers allow the colored layer to maintain its smooth interface while still providing the deaeration function through the recesses in the outer layer.
Data Source
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AI summary
The present invention aims to provide an interlayer film for a laminated glass, which includes two or more stacked resin layers including a colored layer, exhibits excellent deaeration properties in a production process of a laminated glass, and is capable of preventing poor appearance of a colored portion, and a laminated glass including the interlayer film for a laminated glass. The present invention relates to an interlayer film for a laminated glass, having a laminated structure including two or more layers, at least including: an outer layer disposed on the outermost surface of the interlayer film for a laminated glass and having a large number of recesses on one surface; and a colored layer containing a colorant, a minimum distance between an outer layer side surface of the colored layer and the surface having a large number of recesses of the outer layer being 150 µm or longer.