Complex comprising a drylaid veil of glass fibres, and a nonwoven fabric of organic fibres

Abstract

The invention concerns a process for preparing a complex sheet comprising a layer of drylaid glass fibres and a layer of organic fibres, comprising: mechanical needling or fluid entanglement, e.g. hydroentanglement, of a nonwoven fabric of continuous organic fibres and of a veil of non-preconsolidated continuous glass fibres, the said nonwoven fabric of organic fibres and the said veil of glass fibres being juxtaposed and the said needles respectively the fluid, water jets being sent from the same side as the nonwoven fabric of organic fibres, in order to make a sheet; and then application of a binder to the bilayer. The so obtained complex fibrous structure shows a low tendency to delaminate and can be impregnated with asphalt or bitumen, and used in the field of roofing, sealing covering or membranes.

1 . A complex sheet, comprising:
 a principal layer of a veil of drylaid non-preconsolidated continuous glass fibers;   a principal layer of a nonwoven fabric of continuous organic fibers; and   optionally an intermediate layer made up of yarns or a grid placed between the two principal layers or within one or both of the principal layers,   wherein the principal layers are bonded together by mechanical needling or fluid entanglement and by a chemical bonding, the mechanical needling or fluid water jets being sent from a same side as the nonwoven fabric of organic fibers.   
     
     
         2 . A complex sheet according to  claim 1 , wherein an intermediate layer, made up of yarns or a grid, is placed between the layer of glass fibers and the layer of organic fibers or is included in one or both of these layers. 
     
     
         3 . A complex sheet according to  claim 2 , wherein the intermediate layer is made of polyester or glass fibers. 
     
     
         4 . A complex sheet according to  claim 1 , wherein the complex sheet includes a binder distributed approximately uniform through its thickness. 
     
     
         5 . A complex sheet, according to  claim 1 , wherein a mass of the complex sheet per unit area ranges from 63 g/m 2  to 840 g/m 2 . 
     
     
         6 . A complex sheet according to  claim 1 , wherein a mass of the complex sheet per unit area ranges from 115 g/m 2  to 550 g/m 2 . 
     
     
         7 . A complex sheet according to  claim 4 , containing:
 from 20 g/m 2  to 150 g/m 2  of glass fibers;   from 40 g/m 2  to 500 g/m 2  of organic fibers;   from 3 g/m 2  to 190 g/m 2  of binder.   
     
     
         8 . A roofing or sealing covering or membrane comprising a complex sheet as set forth in  claim 7 , and asphalt or bitumen. 
     
     
         9 . A complex sheet comprising:
 a principal layer of a veil of drylaid non-preconsolidated continuous glass fibers; and   a principal layer of a nonwoven fabric of continuous organic fibers,   wherein the layers are bonded together by mechanical needling or fluid entanglement and by a chemical bonding, the mechanical needling or fluid water jets being sent from the same side as the nonwoven fabric of continuous organic fibers.   
     
     
         10 . A complex sheet according to  claim 9 , further comprising an intermediate layer, made up of yarns or a grid, placed between the layer of glass fibers and the layer of organic fibers. 
     
     
         11 . A complex sheet according to  claim 10 , wherein the intermediate layer is made of polyester or glass fibers. 
     
     
         12 . A complex sheet according to  claim 9 , wherein the complex sheet includes a binder distributed approximately uniform through its thickness. 
     
     
         13 . A complex sheet according to  claim 9 , wherein a mass of the complex sheet per unit area ranges from 63 g/m 2  to 840 g/m 2 . 
     
     
         14 . A complex sheet according to  claim 9 , wherein a mass of the complex sheet per unit area ranges from 115 g/m 2  to 550 g/m 2 . 
     
     
         15 . A complex sheet according to  claim 12 , containing:
 from 20 g/m 2  to 150 g/m 2  of glass fibers;   from 40 g/m 2  to 500 g/m 2  of organic fibers;   from 3 g/m 2  to 190 g/m 2  of binder.   
     
     
         16 . A roofing or sealing covering or membrane comprising a complex sheet of  claim 15 , and asphalt or bitumen. 
     
     
         17 . A complex sheet consisting of:
 a principal layer of a veil of drylaid non-preconsolidated continuous glass fibers; and   a principal layer of a nonwoven fabric of continuous organic fibers,   wherein the layers are bonded together by mechanical needling or fluid entanglement and by a chemical bonding, the mechanical needling or fluid water jets being sent from the same side as the nonwoven fabric of organic fibers.   
     
     
         18 . A complex sheet according to  claim 17 , wherein a mass of the complex sheet per unit area ranges from 63 g/m 2  to 840 g/m 2 . 
     
     
         19 . A complex sheet according to  claim 17 , wherein a mass of the complex sheet per unit area ranges from 115 g/m 2  to 550 g/m 2 . 
     
     
         20 . A complex sheet according to  claim 12 , containing:
 from 20 g/m 2  to 150 g/m 2  of glass fibers; and   from 40 g/m 2  to 500 g/m 2  of organic fibers.