Wedge Interlayer Film Layout for Uniform Laminated Glass Acoustics
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Solution Overview
Problem
Wedge-shaped interlayer films for laminated glass often fail to achieve uniform sound insulation performance due to varying sound insulation effects across different directions, leading to inferior sound insulation in certain areas.
Innovation Solution
An interlayer film with five or more resin layers, comprising a first resin layer with a glass transition temperature of 15°C or higher and a second resin layer with a lower glass transition temperature, featuring a wedge-shaped design with controlled layer percentage variation and embossments for enhanced sound insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wedge-shaped interlayer film is made to include a plurality of resin layers to provide sound insulation performance, then the sound insulation effect will differ depending on the width direction, but the sound insulation performance becomes inferior in certain areas
Solution Approach 1:
The patent applies local quality by differentiating the glass transition temperatures of resin layers at different locations. The first resin layer (with Tg ≥ 15°C) is positioned at the thick end of the wedge-shaped film, while the second resin layer (with Tg < 15°C) is at the thin end. This local differentiation ensures that each region of the wedge-shaped film has appropriate viscoelastic properties for sound insulation, maintaining uniform performance across the width direction despite the varying thickness.
Solution Approach 2:
The patent changes the physical parameter of glass transition temperature across different resin layers to solve the uniformity problem. By setting specific Tg ranges for different resin layers (first layer: Tg ≥ 15°C, second layer: Tg < 15°C), the patent optimizes the sound insulation performance at different thickness regions of the wedge-shaped film, ensuring consistent sound insulation effect throughout the width direction.
2Reliability
If the layer percentage A varies significantly across the width of the interlayer film, then the sound insulation effect differs by location, but achieving uniform sound insulation becomes difficult
Solution Approach 1:
The patent implements local quality by controlling the spatial distribution of layer percentage A. Specifically, it ensures that in the central region (0.5X width), the variation in layer percentage A does not exceed 10%, while allowing greater variation in the edge regions (0.25X from each end). This localized control strategy maintains uniform sound insulation performance where it matters most while providing design flexibility at the edges.
Solution Approach 2:
The patent changes the distribution pattern of layer percentage A across the width direction to achieve uniform sound insulation. By setting specific variation limits (≤10% in the 0.5X central region), the patent optimizes the sound insulation performance distribution, ensuring that the sound insulation effect remains consistent across the width direction despite the wedge-shaped thickness variation.
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 interlayer film provides consistent and improved sound insulation performance by maintaining uniform sound insulation properties across the width of the laminated glass, while also enhancing handleability and deaeration performance.
Implementation Method 1
a first resin layer having a glass transition temperature of 15°C or higher; and a second resin layer having a glass transition temperature of lower than 15°C
Implementation Method 2
a tan δ at the glass transition temperature is 2.5 or more, and a storage elastic modulus at -5°C is 3.0×10^4
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
An interlayer film for laminated glass of the present invention has five or more resin layers, includes a first resin layer having a glass transition temperature of 15°C or higher, and a second resin layer having a glass transition temperature of lower than 15°C, the interlayer film for laminated glass has one edge and the other edge opposite to the one edge, a thickness of the other edge is larger than the thickness of the one edge, and when a percentage of a total thickness of second resin layer with respect to the total thickness of all the resin layers is taken to be a layer percentage A (%), and a distance from the one edge to the other edge is taken to be X, the interlayer film for laminated glass has a region of 0.5X in which a difference between a maximum value and a minimum value of the layer percentage A is 10% or less. According to the present invention, a wedge-shaped interlayer film having good sound insulation performance can be provided.