Production method of layered sound absorptive non-woven fabric

Abstract

Production method of layered sound absorptive non-woven fabric, which comprises a resonance membrane which is positioned between two layers of the card fibrous web, while both layers of the card fibrous web are produced simultaneously in carding machine, from which each layer of the card fibrous web is separately brought into the device for production of nanofibres through electrostatic spinning, in which to the side of at least one layer of the card fibrous web adjacent to the remaining layer of the card fibrous web a layer of nanofibres is applied, after then both layers of the card fibrous web near to one another until their adjacent sides sit down one on another, they are laid one on another in a selected quantity of layers and the layers join mutually.

1 . Production method of layered sound absorptive non-woven fabric, which comprises a resonance membrane formed by a layer of nanofibres having diameter to 600 nanometers and basis weight of 0,1 to 5 gm  −2 , which is positioned between two layers of the card fibrous web, wherein both layers of the card fibrous web are produced simultaneously in carding machine, from which at least one layer of the card fibrous web is brought into the device for production of nanofibres through electrostatic spinning, in which to the side of this layer of the card fibrous web adjacent to the remaining layer the layer of nanofibres is applied, after then after exiting the device for production of nanofibres through electrostatic spinning both layers of the card fibrous web near one to another until their adjacent parts, out of which at least on one there is applied a layer of nanofibres forming the resonance membrane, sit down one on another. 
   
   
       2 . The method according to  claim 1 , wherein the lower layer of the card fibrous web is passing outside the device for production of nanofibres through electrostatic spinning. 
   
   
       3 . The method according to  claim 1 , wherein both layers of the card fibrous web are guided separately into the device for production of nanofibres through electrostatic spinning, while at least the upper layer of the card fibrous web is passing through the spinning compartment of this device and to the side of this upper layer of the card fibrous web adjacent to the lower layer the layer of nanofibres is applied. 
   
   
       4 . The method according to  claim 3 , wherein the lower layer of the card fibrous web is passing outside the spinning compartment of the device for production of nanofibres through electrostatic spinning. 
   
   
       5 . The method according to  claim 1 , wherein both layers of the card fibrous web are guided through the spinning compartment of the device for production of nanofibres through electrostatic spinning, in which one layer of nanofibres is applied to the side of the upper layer of the card fibrous web adjacent to the lower layer of the card fibrous web and the second layer of nanofibres is being applied to the side of lower layer of the card fibrous web reverse to the upper layer of the card fibrous web. 
   
   
       6 . The method according to  claim 5 , wherein the layer of nanofibres applied to the side of lower layer of the card fibrous web reverse to the first layer of the card fibrous web there is joined at least one another layer of the card fibrous web with a layer of nanofibres applied on the reverse side of this another layer of the card fibrous web. 
   
   
       7 . The method according to  claim 6 , wherein further layer of the card fibrous web is produced on the same carding machine as the upper and lower layer of the card fibrous web. 
   
   
       8 . The method according to  claim 6 , wherein this further layer of the card fibrous web is produced on another carding machine than the upper and lower layer of the card fibrous web. 
   
   
       9 . The method according to  claim 5 , wherein the layer of nanofibres applied on outer side of lower layer of the card fibrous web reverse to the previous layer of the card fibrous web an auxiliary layer of the card fibrous web is joined. 
   
   
       10 . The method according to  claim 9 , wherein the auxiliary layer of the card fibrous web is produced on the same carding machine as the upper and lower layer of the card fibrous web. 
   
   
       11 . The method according to  claim 9 , wherein the auxiliary layer of the card fibrous web is produced on another carding machine than the upper and lower layer of the card fibrous web. 
   
   
       12 . The method according to  claim 1 , wherein both layers of the card fibrous web are guided through the spinning compartment of the device for production of nanofibres through electrostatic spinning, in which to the mutually adjacent sides of both layers of the card fibrous web there is applied always one layer of nanofibres. 
   
   
       13 . The method according to  claim 1 , wherein after exiting the device for production of nanofibres through electrostatic spinning the fabric containing at least two layers of the card fibrous web, in between of which there is arranged at least one layer of nanofibres, is formed by means of cross laying into layers. 
   
   
       14 . The method according to  claim 1 , wherein after exiting the device for production of nanofibres through electrostatic spinning the fabric containing at least two layers of the card fibrous web, in between of which there is arranged at least one layer of nanofibres, is guided into the laying device in which it is laid into layers. 
   
   
       15 . The method according to  claim 1 , wherein the layers of the fabric are mutually joined by heating to the temperature of melting the material with the lowest melting temperature, which is contained in layers of the fabric.