Acoustical insulation laminate with polyolefin layer and...

B - Operations – Transporting – 32 – B

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B32B 27/12 (2006.01) B29C 43/20 (2006.01) B32B 3/24 (2006.01) B32B 5/18 (2006.01) B32B 27/32 (2006.01) E04B 1/82 (2006.01) E04B 1/84 (2006.01) G10K 11/168 (2006.01)

Patent

CA 2494741

An acoustical insulation laminate (10) having a porous polyolefin layer and a process for making the laminate. The laminate preferably includes a porous multiple density polyolefin film (14), a sound absorbing material (12) and may include a face cloth (18) on one or both sides of the laminate. The porous polyolefin film (14) is preferably disposed between a sound source and the sound absorbing material (12) improving the total noise reduction coefficient of the sound absorbing material (12) alone while reducing the weight of laminates having similar noise reduction capabilities.

Stratifié d'isolation acoustique présentant une couche de polyoléfine poreuse et procédé de production du stratifié. Le stratifié comprend de préférence un film de polyoléfine poreux à densités multiples, un matériau absorbant acoustique et il peut comprendre un tissu d'habillage sur l'une ou les deux faces du stratifié. Le film de polyoléfine poreux est de préférence disposé entre une source de son et le matériau absorbant acoustique, améliorant le coefficient total de réduction de bruit du matériau absorbant acoustique seul, tout en réduisant le poids de stratifiés ayant des capacités similaires de réduction du bruit.

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