Paintable Acoustic Wall Coating With Thin Sound-Absorbing Structure
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Solution Overview
Problem
Existing sound-absorbing wall coverings either have poor aesthetic appeal, are not paintable, or suffer significant decreases in sound absorption when painted, and most struggle to achieve high sound absorption coefficients at low thicknesses, making them unsuitable for market demands.
Innovation Solution
A multi-layer wall covering comprising a glass textile bonded to an open-pored foam with a discontinuous adhesive layer, optimizing air permeability, adhesive distribution, and foam porosity to maintain sound absorption even after painting, achieving a sound absorption coefficient of at least 0.25 as per NF EN ISO 1654 standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of sound-absorbing wall covering is increased, then the sound absorption coefficient increases, but the thickness becomes excessive (beyond 1 cm) causing storage, transport and installation difficulties
Solution Approach 1:
The patent employs an open-pore foam support structure with high porosity (0.80-0.97) to maximize sound absorption within a thin profile. The porous architecture allows sound waves to penetrate and dissipate energy through friction and viscous losses in the pore structure, achieving high absorption coefficients without requiring excessive thickness.
Solution Approach 2:
The invention creates a composite structure combining glass textile surface layer with open-pore foam support, bonded through a discontinuous adhesive layer. This composite design integrates the aesthetic and paintability of glass textile with the acoustic absorption properties of the foam, achieving both functional and aesthetic requirements in a thin configuration.
2Reliability
If a porous surface layer is used to achieve good sound absorption properties, then the sound absorption coefficient increases, but the surface appearance becomes unsatisfactory and painting becomes difficult
Solution Approach 1:
The patent divides the wall covering into distinct functional layers: a glass textile surface layer for aesthetics and paintability, and an open-pore foam support for sound absorption. The discontinuous adhesive layer bonds these segments while preserving the acoustic functionality. This segmentation allows each layer to optimize its specific function without compromising the other.
Solution Approach 2:
The invention applies local quality by using a discontinuous adhesive layer that bonds the glass textile to the foam only at specific points rather than forming a continuous layer. This localized bonding preserves the open pores of the foam structure, maintaining sound absorption pathways while providing sufficient mechanical attachment. The glass textile surface remains visually pleasing and receptive to painting.
3Strength
If a continuous adhesive layer is used to bond textile to foam, then the bonding strength increases, but the sound absorption properties decrease due to blocked pores
Solution Approach 1:
The patent applies partial action by using a discontinuous adhesive layer that provides sufficient bonding strength through strategic point-to-point attachment rather than complete surface coverage. The adhesive is applied in a controlled manner to create discrete bonding zones that secure the textile to the foam while leaving the majority of the foam's pore structure open and accessible to sound waves, thus maintaining acoustic performance.
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 enables wall coverings with low thickness (up to 6 mm) to maintain high sound absorption coefficients in the painted state, achieving classification as sound-absorbing materials while maintaining aesthetic appeal, suitable for use in buildings to improve acoustic comfort.
Implementation Method 1
the foam support having open porosity, the glass textile having static resistance to the passage of air
Implementation Method 2
an organic polymer foam with open porosity of between 0.80 and 0.97
Data Source
AI summary
The invention relates to a multilayer acoustic absorbent coating comprising (a) a supporting layer consisting of an organic polymer foam having an open porosity of between 0.50 and 0.995, (b) a surface layer formed by a glass textile material, having a static resistance to airflow of between 105 N.s.m-4 and 106 N.s.m-4, measured according to the ISO standard 9053, and (c) a discontinuous adhesive layer having a mass per unit area of between 17 and 60 g/m2, at the interface between the supporting layer (a) and the surface layer (b). The invention also relates to a method for producing such a coating and to the use of such a coating for improving the acoustic comfort of a room or a building.