Thick Laminated Glass Interlayer with Recessed Surface for Deaeration
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Solution Overview
Problem
Laminated glass production with thick interlayer films faces challenges in maintaining deaeration properties, leading to reduced transparency due to early adhesion of film peripheral portions to glass during the deaeration process.
Innovation Solution
An interlayer film with a thickness of 850 μm or more at the thickest portion and a specific maximum height roughness, featuring a large number of recesses with a groove shape and continuous bottom, regularly formed parallel to each other, to enhance deaeration properties and prevent adhesion during the bonding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the interlayer film thickness is increased to 850 μm or more to meet diversified requirements, then the functional properties (sound insulation, head-up display) are improved, but the deaeration properties deteriorate leading to reduced transparency
Solution Approach 1:
The invention applies different surface roughness characteristics to different regions of the interlayer film. Specifically, the peripheral portions have a maximum height roughness Ry of 20 μm or more, while the central portion has Ry of 10 μm or more. This local differentiation allows the peripheral regions to maintain deaeration functionality despite the overall increased thickness, preventing early adhesion to glass plates during the deaeration process while still achieving the desired functional properties through the thicker film structure
2Device complexity
If the interlayer film thickness is increased to 850 μm or more, then the structural complexity is reduced by using fewer layers, but the deaeration properties worsen due to early adhesion of film peripheral portions to glass
Solution Approach 1:
By concentrating the deaeration function in the peripheral portions through increased surface roughness (Ry ≥ 20 μm), the invention maintains effective deaeration in a single thick layer structure. This eliminates the need for multiple thinner layers with deaeration features, simplifying the overall structure while ensuring proper air removal during lamination through the roughened peripheral surfaces
3Adaptability or versatility
If the number of resin layers is increased to achieve diversified properties, then the functional versatility is improved, but the interlayer film thickness increases leading to reduced transparency
Solution Approach 1:
The invention achieves property diversity within a single resin layer by creating local roughness variations - smooth central portions for optical clarity and rough peripheral portions for deaeration. This allows the interlayer film to provide both acoustic insulation and optical transparency while maintaining effective deaeration properties, eliminating the need for multiple layers that would compromise transparency
Data Source
AI summary
The present invention aims to provide an interlayer film for a laminated glass that can, even when having a thickness at the thickest portion of 850 μm or more, exhibit sufficient deaeration properties in production of a laminated glass to provide a laminated glass with high transparency, and a laminated glass produced using the interlayer film for a laminated glass. Provided is an interlayer film for a laminated glass having a large number of recesses on at least one surface, the interlayer film for a laminated glass having a thickness T (μm) measured in conformity with JIS K-6732 (1996) and a maximum height roughness Ry (μm) measured in conformity with JIS B-0601 (1994) at a thickest portion, the thickness T and the maximum height roughness Ry satisfying the following expressions (1) and (1′):Ry≥0.020×T+16.6 (1),T≥850 (1′).