ACOUSTIC LAMINATED GLAZING, ACOUSTIC INTERLAYER AND METHOD FOR SELECTING THE INTERLAYER FOR OPTIMAL ACOUSTIC DAMPING.

摘要

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 2.107 Pa over two respective temperature ranges tA and tB. 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 tA or tB, has a shear modulus equivalent to G'eq less than the shear modulus (moduli) equivalent to the other film(s) with iG/i' eq = G ' e sub/ it/i iot/i/ie/i i/where G' is the shear modulus of the material constituting the film, e is the thickness of the film and ie/i tot is the total thickness of the interlayer.