Composite material multilayered membrane with sound insulating and sound absorbing to mitigate impact noise

Abstract

The composite material multilayered membrane of the present invention is sound insulating and sound-absorbent, acting as sound deadening insulation for noise impacts, mainly but not exclusively to be used in flooring, and in particular under the slab in floating floors, with the aim of reducing the transmission of noise into the below room. This membrane includes several layers, which include at least one polymeric monofilament three dimensional mat, at least one resilient mat, and at least one topping layer of waterproofing, breathable or not, tissue. This multilayered membrane with a thickness under a weight of 2 kPa of at least 8 and maximum 15 mm, preferably 10-12 mm, so as to achieve a normalized noise level in the disturbed room Lnw below 50 dB, or an impact insulation class of at least 60 points.

1 . A multilayered composite material membrane, being sound insulating and sound absorbent towards impact noise in flooring and thermal insulation auxiliary, the membrane comprising:
 at least one 3-dimensional polymeric monofilaments mat;   at least one resilient mat; and   at least one waterproofing, finishing layer, wherein said resilient mat is a synthetic fibers mat coupled with at least one waterproofing finishing layer, the mats and layer having a total thickness, under a weight of 2 kPa, comprised between at least 8 mm and at most 15 mm.   
     
     
         2 . The multilayered composite material membrane according to  claim 1 , having a thickness under a weight of 2 kPa between at least 10 mm and 12.5 mm. 
     
     
         3 . The multilayered composite material membrane according to  claim 1 , wherein the 3-dimensional polymeric monofilaments mat is comprised of polypropylene based extruded filaments, entangled and welded at crossings, having a weight comprised between 400 g/m 2  and 700 g/m 2  and having a thickness under a weight of 2 kPa comprised between at least 8 and at most 10 mm. 
     
     
         4 . The multilayered composite material membrane according to  claim 1 , wherein the 3-dimensional polymeric monofilaments mat is comprised of polypropylene based extruded filaments, entangled and welded at crossings, being wavy shaped with parallel channels structure. 
     
     
         5 . The multilayered composite material membrane according to  claim 1 , wherein the three dimensional polymeric monofilaments mat is comprised of polypropylene based extruded filaments, entangled and welded at crossings and having a cuspated shape. 
     
     
         6 . The multilayered composite material membrane according to  claim 1 , wherein the three dimensional polymeric monofilaments mat is comprised of polyester based extruded filaments, entangled and welded at crossings. 
     
     
         7 . The multilayered composite material membrane according to  claim 1 , wherein the three dimensional polymeric monofilaments mat is comprised of polyammide based extruded filaments, entangled and welded at crossings. 
     
     
         8 . The multilayered composite material membrane according to  claim 1 , wherein the resilient mat is comprised of a non woven fabric of synthetic fibers. 
     
     
         9 . The multilayered composite material membrane according to  claim 1 , wherein the resilient mat is comprised of 3.3 to 20 dtex synthetic polyester fibers, needled and resined. 
     
     
         10 . The multilayered composite material membrane according to  claim 1 , wherein the resilient mat is comprised of 6 to 17 dtex synthetic polyester fibers, needled and resined. 
     
     
         11 . The multilayered composite material membrane according to  claim 1 , wherein at least one resilient mat is comprised of synthetic polyester needled and resined fibers, having a weight between at least 150 g/m 2  and at most 450 g/m 2 . 
     
     
         12 . The multilayered composite material membrane according to  claim 1 , wherein the at least one resilient mat is comprised of synthetic polyester needled and resined fibers, having a weight between at least 200 g/m 2  and at most 300 g/m 2 . 
     
     
         13 . The multilayered composite material membrane according to  claim 1 , wherein the at least one waterproofing finishing layer is comprised of low density polyethilene, weighing between at least 10 g/m 2  and at most 80 g/m 2 . 
     
     
         14 . The multilayered composite material membrane according to  claim 1 , wherein the at least one waterproofing finishing layer is comprised of a waterproofing and vapor permeable synthetic spun bonded tissue. 
     
     
         15 . The multilayered composite material membrane according to  claim 1 , wherein the at least one waterproofing finishing layer is comprised of waterproofing and vapor permeable synthetic spun bonded tissue weighing between at least 90 g/m 2  and at most 160 g/m 2 , with water penetration resistance higher than 2 meters of water column according to EN 20811, with a vapor diffusion coefficient sd comprised between at least 0.01 and at most 0.05 according to EN ISO 12572. 
     
     
         16 . The multilayered composite material membrane according to  claim 1 , wherein the at least one waterproofing finishing layer is comprised of waterproofing and vapor permeable polypropylene based spun bonded tissue. 
     
     
         17 . The multilayered composite material membrane according to  claim 1 , wherein the at least one waterproofing finishing layer is comprised of waterproofing and vapor permeable polyester based spun bonded tissue. 
     
     
         18 . The multilayered composite material membrane according to  claim 1 , wherein the at least one waterproofing finishing layer is comprised of a waterproofing and vapor permeable synthetic spun bonded tissue at least 8 cm larger than the monofilament mat and the resilient mat, forming a selvedge equipped with a minimum 15 mm wide butyl strip, protected by a release silicone paper.