Acoustic laminated glazing, acoustic interlayer and method for selecting the interlayer for optimal acoustic damping

The invention concerns a laminated glazing (2) comprising a viscoelastic plastic interlayer (3) including at least two damping films (30, 31) each having a loss factor tan δ higher than 0,6 and a shear modulus G' less than 2.10 Pa over two respective temperature ranges t and t. The invention is...

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Bibliographische Detailangaben
Hauptverfasser:	BOURE, JEAN-PHILIPPE, REHFELD, MARC, CHARLIER, JULIEN, GAUDRY, ELOI
Format:	Patent
Sprache:	eng
Schlagworte:	ACOUSTICS ACOUSTICS NOT OTHERWISE PROVIDED FOR CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS CHEMISTRY GLASS JOINING GLASS TO GLASS OR OTHER MATERIALS LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM METALLURGY METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL MINERAL OR SLAG WOOL MUSICAL INSTRUMENTS PERFORMING OPERATIONS PHYSICS SOUND-PRODUCING DEVICES SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS SURFACE TREATMENT OF GLASS TRANSPORTING VEHICLES IN GENERAL VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISEPROVIDED FOR
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Beschreibung
Zusammenfassung:	The invention concerns a laminated glazing (2) comprising a viscoelastic plastic interlayer (3) including at least two damping films (30, 31) each having a loss factor tan δ higher than 0,6 and a shear modulus G' less than 2.10 Pa over two respective temperature ranges t and t. The invention is characterized in that the film which has at frequency 200 Hz the highest loss factor tan δ over a given temperature range included in the temperature ranges tor t, has a shear modulus equivalent to G' less than the shear modulus (moduli) equivalent to the other film(s) with ' = G ' where G' is the shear modulus of the material constituting the film, e is the thickness of the film and is the total thickness of the interlayer.