Layered Sound-Insulating Curtain Fabric Without Metallic Rustling
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Solution Overview
Problem
Existing soundproofing solutions for building openings, such as windows, either provide limited sound insulation or generate unpleasant noises due to the use of fabrics or metallic films, and lack an aesthetically pleasing design for harmonious integration.
Innovation Solution
A soundproofing device comprising at least three layers: a heavy occulting fabric facing the sound source, a metallized fabric produced by vacuum metallization of a woven substrate with fine strands, and a brushed cotton fabric, which together provide effective sound insulation without generating parasitic noise and maintain flexibility and aesthetic appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heavy occulting fabric is used for sound insulation, then soundproofing performance is improved, but flexibility and aesthetic appearance deteriorate
Solution Approach 1:
The soundproofing system is divided into three distinct layers: a first heavy occulting fabric layer for sound insulation, a second flexible metallized fabric layer for aesthetics and flexibility, and a third layer for additional soundproofing. This segmentation allows each layer to specialize in one function, resolving the contradiction between heavy material requirements for sound insulation and flexibility requirements for aesthetic appearance.
Solution Approach 2:
The invention uses composite fabric structures, particularly the metallized fabric combining woven substrate with deposited metal layers (aluminum, silver, or chromium). This composite structure provides both the flexibility of fabric and the acoustic reflection properties of metal, while the three-layer composite system combines materials with different properties to achieve both sound insulation and flexibility simultaneously.
2Reliability
If metallic films are used for soundproofing, then sound insulation is improved, but parasitic noise (rustling) is generated
Solution Approach 1:
The invention uses flexible fabric substrates with deposited metal layers instead of rigid metallic films. The fabric base provides flexibility that prevents the rustling noise characteristic of thin metallic films, while the metal deposition layer maintains the sound reflection and insulation properties. This resolves the contradiction by using a flexible carrier that eliminates parasitic noise while preserving acoustic performance.
3Reliability
If fabric weight is increased for sound insulation, then noise attenuation is improved, but aesthetic appearance and integration deteriorate
Solution Approach 1:
The system segments the heavy soundproofing function into the first and third layers, while the second metallized fabric layer provides the visible aesthetic surface. This allows the heavy materials to be used where they provide acoustic benefit without dominating the visual appearance, resolving the contradiction between noise attenuation and aesthetic integration.
Solution Approach 2:
The metallized fabric layer can be deposited with different metals (aluminum, silver, chromium) to achieve various aesthetic appearances and reflections. This allows the soundproofing device to be visually integrated with different building aesthetics while the heavy occulting layers provide the necessary noise attenuation, separating visual appearance from 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 achieves significant noise attenuation of up to 7 dB, reducing external noise by three-quarters, making it suitable for use in curtains or window treatments while maintaining a pleasant appearance.
Implementation Method 1
The metallization phase is carried out under vacuum at 400 m/minute, in particular, by deposition of metal in the vapor phase.
Implementation Method 2
a first layer, facing a sound source to be obscured, comprising an occulting fabric weighing more than 250 g/m2
Data Source
Figure 1
AI summary
Soundproofing device (D) comprising at least three layers: - a first layer (1), facing a sound source to be blocked, comprising a blackout fabric with a weight greater than 250 g/m2, - a second layer (2) comprising a metallized fabric, a metallized face (2a) of the fabric being disposed in contact with the first layer, - a third layer (3) comprising a brushed cotton fabric with a weight greater than 250 g/m2, disposed in contact with the second layer (2) opposite the first layer (1), the metallized fabric being produced by vacuum metallization of a woven substrate previously calendered by the application of a compression force.