Acoustic nonwoven fabric for perforated ceiling elements

Abstract

A ply has a base weight of not more than 45 g/m 2 for use in a ceiling element and includes a fiber blend in a proportion of not more than 30 g/m 2 a flame retardant in a proportion of not more than 10 g/m 2 .

1 - 9 . (canceled) 
     
     
         10 . A ply having a base weight of not more than 45 g/m 2  for use in a ceiling element comprising:
 a fiber blend in a proportion of not more than 30 g/m 2 ; and   a flame retardant in a proportion of not more than 10 g/m 2 .   
     
     
         11 . The ply as recited in  claim 10 , wherein the flame retardant includes diammonium hydrogenphosphate. 
     
     
         12 . The ply as recited in  claim 10 , wherein the fiber blend includes cellulosic fibers. 
     
     
         13 . The ply as recited in  claim 10 , wherein the fiber blend includes fibers of two different types of cellulosic pulp. 
     
     
         14 . The ply as recited in  claim 10 , wherein the fiber blend includes glass fibers in a proportion of not more than 10 g/m 2 . 
     
     
         15 . The ply as recited in  claim 10 , further comprising an acrylate-based binder in a proportion of less than 5 g/m 2 . 
     
     
         16 . An acoustical nonwoven having a basis weight of less than 60 g/m 2  for metal ceilings comprising:
 a ply having a base weight of not more than 45 g/m 2  and including a fiber blend in a proportion of not more than 30 g/m 2  and a flame retardant in a proportion of not more than 10 g/m 2 ; and   an adhesive material in a proportion of less than 15 g/m 2 .   
     
     
         17 . The acoustical nonwoven as recited in  claim 16 , wherein the flame retardant includes diammonium hydrogenphosphate. 
     
     
         18 . The acoustical nonwoven as recited in  claim 16 , wherein the fiber blend includes cellulosic fibers. 
     
     
         19 . The acoustical nonwoven as recited in  claim 16 , wherein the fiber blend includes fibers of two different types of cellulosic pulp. 
     
     
         20 . The acoustical nonwoven as recited in  claim 16 , wherein the fiber blend includes glass fibers in a proportion of not more than 10 g/m 2 . 
     
     
         21 . The acoustical nonwoven as recited in  claim 16 , wherein the ply includes an acrylate-based binder in a proportion of less than 5 g/m 2 . 
     
     
         22 . The acoustical nonwoven as recited in  claim 16 , further comprising a weighted sound absorption coefficient α w  of at least 0.75, the weighted sound absorption coefficient α w  being obtained from measurement according to EN ISO 354 and conversion according to EN ISO 11654. 
     
     
         23 . An assembly comprising:
 a ply having a base weight of not more than 45 g/m 2  and including a fiber blend in a proportion of not more than 30 g/m 2  and a flame retardant in a proportion of not more than 10 g/m 2 ; and   an uncoated perforated metal ceiling element, wherein the assembly exhibits in a measurement according to DIN EN 13823 a SMOGRA value of not more than 30 m 2 /s 2  and a TSP(600s) value of not more than 50 m.   
     
     
         24 . An assembly comprising:
 an acoustical nonwoven having a basis weight of less than 60 g/m 2  for metal ceilings including a ply having a base weight of not more than 45 g/m 2  and including a fiber blend in a proportion of not more than 30 g/m 2  and a flame retardant in a proportion of not more than 10 g/m 2  and an adhesive material in a proportion of less than 15 g/m 2 ; and   an uncoated perforated metal ceiling element, wherein the assembly exhibits in a measurement according to DIN EN 13823 a SMOGRA value of not more than 30 m 2 /s 2  and a TSP(600s) value of not more than 50 m.