Multilayer Sound Dampening Interlayer Films
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current sound dampening interlayers for laminated glass lack sufficient mechanical stability and adhesion to glass while also requiring improvements in sound absorption, environmental footprint, thermal stability, water uptake, processability, and production costs.
Innovation Solution
A multilayer sound dampening interlayer film comprising at least two individual films, where the outer layers are made of ethylene vinyl acetal and the inner layer is softer, with specific ethylene units, vinyl acetate, and acetalization degrees, and optionally including thermoplastic elastomers or polyvinyl acetals, to enhance mechanical and sound insulation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a monolayer film is made particularly soft to improve sound absorption, then sound absorption is improved, but mechanical stability becomes insufficient and adhesion to glass becomes inadequate
Solution Approach 1:
The interlayer is divided into multiple layers with different functions: a soft sound-dampening layer for acoustic performance and harder outer layers for mechanical stability and adhesion. This segmentation allows each layer to optimize its specific function without compromising the others.
Solution Approach 2:
The invention uses composite material structures combining different polymer materials with complementary properties. The sound-dampening layer uses soft materials for acoustic absorption, while outer layers use harder materials for structural integrity, creating a composite interlayer system.
2Object-affected harmful factors
If a monolayer film is made particularly soft to improve sound absorption, then sound absorption is improved, but adhesion to glass becomes inadequate
Solution Approach 1:
The interlayer is divided into multiple layers with different functions: a soft sound-dampening layer for acoustic performance and harder outer layers for mechanical stability and adhesion. This segmentation allows each layer to optimize its specific function without compromising the others.
Solution Approach 2:
Different regions of the interlayer structure have different material properties tailored to local requirements: the inner sound-dampening region is soft for acoustic absorption, while the outer regions adjacent to glass are harder for adhesion and structural support.
3Object-affected harmful factors
If multilayer systems are used with individual layers differing in mechanical strengths to achieve sound absorption by mechanical decoupling, then sound absorption is improved, but device complexity increases
Solution Approach 1:
The interlayer is divided into multiple layers with different functions: a soft sound-dampening layer for acoustic performance and harder outer layers for mechanical stability and adhesion. This segmentation allows each layer to optimize its specific function without compromising the others.
Solution Approach 2:
The invention uses composite material structures combining different polymer materials with complementary properties. The sound-dampening layer uses soft materials for acoustic absorption, while outer layers use harder materials for structural integrity, creating a composite interlayer system.
Data Source
AI summary
The invention is directed to multilayer sound dampening interlayer films comprising ethylene vinyl acetals.