Laminated Glazing Acoustic Interlayer Design
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Solution Overview
Problem
Current acoustic laminated glazing solutions face challenges with expensive and mechanically inadequate interlayers, poor chemical stability of recycled materials, and increased plasticizer migration, which affect acoustic performance and safety, especially in applications requiring thermal insulation and privacy.
Innovation Solution
A laminated glazing design incorporating a multi-layered acoustic thermoplastic interlayer with a thermoplastic layer of low acoustic performance, placed between the interlayer and glass panels, to enhance privacy, reduce plasticizer migration, and maintain acoustic performance, while using recycled materials to minimize costs and environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a monolayer acoustic interlayer with high damping coefficient is used to improve acoustic performance, then soundproofing is improved, but mechanical properties become insufficient for safety windows and motor-vehicle windows
Solution Approach 1:
The patent uses a composite interlayer structure combining a first thermoplastic layer (0.2-0.5mm) with a second thermoplastic layer containing acoustic additives (0.5-2.0mm). The first layer provides mechanical strength and safety, while the second layer provides acoustic damping, resolving the contradiction between mechanical properties and acoustic performance.
2Ease of manufacture
If recycled material is used to reduce cost and environmental footprint, then cost and carbon footprint are reduced, but chemical stability deteriorates due to mix of used interlayers from different suppliers
Solution Approach 1:
The patent segments the interlayer into two distinct thermoplastic layers with specific functions. The first layer provides structural integrity, while the second layer with acoustic additives provides soundproofing. This segmentation allows each layer to be optimized independently and ensures consistent chemical stability throughout the composite structure.
Solution Approach 2:
The patent specifies precise thickness parameters for each layer (first layer: 0.2-0.5mm, second layer: 0.5-2.0mm) and controls the light transmission ratio (TLc/TLd ≥ 50%). These parameter controls ensure consistent performance and chemical stability while using recycled materials, resolving the contradiction between cost reduction and compositional stability.
3Object-affected harmful factors
If a thermoplastic layer with low acoustic performances is placed between the acoustic interlayer and glass panel to improve privacy and reduce plasticizer migration, then privacy and chemical stability are improved, but acoustic performance may be compromised
Solution Approach 1:
The patent creates a composite structure where the first thermoplastic layer (with low acoustic performance) provides privacy and prevents plasticizer migration, while the second thermoplastic layer (with high acoustic damping) provides soundproofing. The combination resolves the contradiction by assigning different functions to different layers.
Solution Approach 2:
The patent applies local quality by giving different acoustic properties to different regions of the interlayer assembly. The first layer has low acoustic performance but high privacy protection, while the second layer has high acoustic damping. This local differentiation allows each region to optimize its specific function without compromising the overall system.
4Reliability
If multiple glass panels with different thickness are used to absorb different frequencies, then acoustic comfort is improved, but the glazing becomes thick and not secured
Solution Approach 1:
The patent changes the approach from using multiple glass panels of different thickness to using a single laminated structure with controlled interlayer thicknesses. The first thermoplastic layer (0.2-0.5mm) and second thermoplastic layer (0.5-2.0mm) provide acoustic damping through their material properties and thickness ratios, achieving acoustic comfort without increasing overall glazing thickness.
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 solution provides improved acoustic comfort, privacy, and mechanical stability, while reducing the cost and environmental footprint by using recycled materials, and allows for color matching and shape mismatch absorption, thus optimizing the laminated glazing's performance and efficiency.
Implementation Method 1
a special interlayer, namely acoustic interlayer, developed for their acoustic performance, having a high damping coefficient, is used to further improve the soundproofing to reduce disturbance by external noise
Implementation Method 2
the thermoplastic layer absorbs the mismatch of the shape between the first and the second glass panels
Implementation Method 3
The acoustic interlayer and the standard interlayer are separated by a thin (50 μm) PET film, a chemical separation, made of a material intended to ensure chemical separation of the two other interlayers
Data Source
AI summary
A laminated glazing, and an associated method and use, including a first and a second glass panels laminated together by an interlayer assembly. The interlayer assembly includes a multi-layered acoustic thermoplastic interlayer. The interlayer assembly further includes a thermoplastic layer with low acoustic performances and placed between the multi-layered acoustic thermoplastic interlayer and the first or the second glass panel. The light transmission of the multi-layered acoustic thermoplastic interlayer (TLc) equals to, or is higher, than 50% of the light transmission of the thermoplastic layer (TLd).