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

摘要

laminated glazing (2) comprising a viscoelastic plastic interlayer (3) including at least two cushioning (30, 31), each with a loss factor tan.delta.supu00e9rieur to 0.6 and a shear modulus g is less than 2.107 pa in two temperature ranges on these ta and tb, characterized in that the film presents the frequency of 200 hz, the loss factor tan.delta.the highest temperature in a certain range is included in the range of temperatures ta or tb, presents an equivalent shear modulus g, q (x) is lower than the module (s) e tot equivalent shear (s) of the other films, (eq = g 'e' g 'e, where the e modulus the material of the film (shear)the film thickness and the total thickness of the interlayer rule.