Multi-layer Interlayer Film for High Frequency Sound Insulation
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Solution Overview
Problem
Conventional interlayer films for laminated glass fail to provide sufficient sound insulation in high frequency areas, particularly above 2000 Hz, and struggle to achieve both high sound insulation and penetration resistance simultaneously.
Innovation Solution
A multi-layer interlayer film with specific thermoplastic resin layers, where the second layer has a glass transition temperature of 32°C or more and the first layer has a lower glass transition temperature, and a thickness between 787 μm and 950 μm, enhancing sound insulation and penetration resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional interlayer films are used, then manufacturing simplicity is maintained, but sound insulation in high frequency areas (2000 Hz or more) is insufficient
Solution Approach 1:
The interlayer film is divided into multiple layers (first layer, second layer, and optionally third layer) with different glass transition temperatures. The second layer (Tg ≥ 32°C) specifically targets high frequency sound insulation, while the first layer (lower Tg) provides complementary performance. This segmentation allows each layer to contribute differently to sound insulation across frequency ranges.
Solution Approach 2:
Different layers are assigned different glass transition temperatures to optimize performance for specific frequency ranges. The second layer with Tg ≥ 32°C is specifically designed for high frequency sound insulation (2000 Hz or more), while the first layer with lower Tg addresses other frequency ranges, creating localized functional optimization within the composite structure.
2Object-affected harmful factors
If interlayer film thickness is increased to improve sound insulation, then sound insulation performance improves, but penetration resistance may be compromised
Solution Approach 1:
The patent optimizes the thickness of each layer within specific ranges (first layer: 394-950 μm, second layer: 394-950 μm, third layer: 394-950 μm) to achieve the balance between sound insulation and penetration resistance. The total thickness is controlled at 787 μm or more, with optimal ranges identified for maximum performance.
Solution Approach 2:
The interlayer film uses a composite structure combining thermoplastic resins with different glass transition temperatures in multiple layers. This composite approach allows the film to simultaneously achieve sound insulation (particularly in high frequency areas) and penetration resistance, as each layer contributes different mechanical and acoustic properties.
3Object-affected harmful factors
If a single-layer interlayer film is used, then manufacturing complexity is reduced, but both sound insulation and penetration resistance cannot be optimized simultaneously
Solution Approach 1:
The interlayer film is divided into multiple layers (first layer, second layer, and optionally third layer) with different glass transition temperatures. The second layer (Tg ≥ 32°C) specifically targets high frequency sound insulation, while the first layer (lower Tg) provides complementary performance. This segmentation allows each layer to contribute differently to sound insulation across frequency ranges.
Solution Approach 2:
The interlayer film uses a composite structure combining thermoplastic resins with different glass transition temperatures in multiple layers. This composite approach allows the film to simultaneously achieve sound insulation (particularly in high frequency areas) and penetration resistance, as each layer contributes different mechanical and acoustic properties.
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 effectively improves sound insulation in high frequency areas up to 4000 Hz and enhances penetration resistance, achieving levels previously unattainable with conventional techniques.
Implementation Method 1
the glass transition temperature of the second layer being 32° C. or more, the glass transition temperature of the first layer being lower than the glass transition temperature of the second layer
Implementation Method 2
a first layer containing a thermoplastic resin and a second layer containing a thermoplastic resin, the second layer being arranged on a first surface side of the first layer
Data Source
AI summary
There is provided an interlayer film for laminated glass with which the sound insulating properties in a high frequency area of 2000 Hz or more can be effectively enhanced. The interlayer film for laminated glass according to the present invention has a two or more-layer structure and is provided with a first layer containing a thermoplastic resin and a second layer containing a thermoplastic resin, the second layer is arranged on a first surface side of the first layer, and the interlayer film is provided with Constitution A: “the glass transition temperature of the second layer being 32° C. or more, the glass transition temperature of the first layer being lower than the glass transition temperature of the second layer, and the thickness of the interlayer film being more than 787 μm and 950 μm or less” or Constitution B: “the glass transition temperature of the second layer being 25° C. or more, the glass transition temperature of the first layer being lower than the glass transition temperature of the second layer, and the thickness of the interlayer film being more than 950 μm”.