Process for the production of spunbonded nonwoven

Abstract

The invention relates to a process ( 100, 101 ) for the production of spunbonded nonwovens ( 1.1, 1.2, 1.3 ) and a device ( 200, 201 ) for the production of spunbonded nonwovens ( 1.1, 1.2, 1.3 ), wherein, in the process ( 100, 101 ), a spinning mass ( 2 ) is extruded through a plurality of nozzle holes ( 4.1, 4.2, 4.3 ) of at least a first spinneret ( 3.1 ) and a second spinneret ( 3.2 ) to form filaments ( 5.1, 5.2, 5.3 ) and the filaments ( 5.1, 5.2, 5.3 ) are drawn, in each case, in the extrusion direction, with the filaments ( 5.1 ) of the first spinneret ( 3.1 ) being deposited on the conveyor belt ( 9 ) to form a first spunbonded nonwoven ( 1.1 ) and the filaments ( 5.2 ) of the second spinneret ( 3.2 ) being deposited on the conveyor belt ( 9 ) to form a second spunbonded nonwoven ( 1.2 ) over the first spunbonded nonwoven ( 1.1 ) in order to obtain a multi-layered spunbonded nonwoven ( 10 ). For increasing the throughput of the process, it is suggested that the multi-layered spunbonded nonwoven ( 10 ) is separated into at least the first spunbonded nonwoven ( 1.1 ) and the second spunbonded nonwoven ( 1.2 ) in a subsequent step and the first and second spunbonded nonwovens ( 1.1, 1.2 ) after separation each undergo a hydroentanglement ( 15.1, 15.2 ) and optionally a drying ( 12 ) individually and/or are each wound up individually.

1 . A process for the production of spunbonded nonwovens ( 1 . 1 ,  1 . 2 ,  1 . 3 ), wherein a spinning mass ( 2 ) is extruded through a plurality of nozzle holes ( 4 . 1 ,  4 . 2 ,  4 . 3 ) of at least a first spinneret ( 3 . 1 ) and a second spinneret ( 3 . 2 ) to form filaments ( 5 . 1 ,  5 . 2 ,  5 . 3 ) and the filaments ( 5 . 1 ,  5 . 2 ,  5 . 3 ) are drawn, in each case, in the extrusion direction, with the filaments ( 5 . 1 ) of the first spinneret ( 3 . 1 ) being deposited on the conveyor belt ( 9 ) to form a first spunbonded nonwoven ( 1 . 1 ) and the filaments ( 5 . 2 ) of the second spinneret ( 3 . 2 ) being deposited on the conveyor belt ( 9 ) to form a second spunbonded nonwoven ( 1 . 2 ) over the first spunbonded nonwoven ( 1 . 1 ) in order to obtain a multi-layered spunbonded nonwoven ( 10 ), characterized in that the multi-layered spunbonded nonwoven ( 10 ) is separated into at least the first spunbonded nonwoven ( 1 . 1 ) and the second spunbonded nonwoven ( 1 . 2 ) in a subsequent step and after separation the first and second spunbonded nonwovens ( 1 . 1 ,  1 . 2 ) each undergo a hydroentanglement ( 15 . 1 ,  15 . 2 ) and optionally a drying ( 12 ) individually and/or are each wound up individually. 
     
     
         2 . A process according to  claim 1 , characterized in that the multi-layered spunbonded nonwoven ( 10 ) is subjected to at least one treatment step ( 11 ,  12 ) before it is unravelled into at least the first and the second spunbonded nonwovens ( 1 . 1 ,  1 . 2 ). 
     
     
         3 . A process according to  claim 2 , characterized in that the at least one treatment step ( 11 ,  12 ) of the multi-layered spunbonded nonwoven ( 10 ) is selected from the group consisting of: a washing ( 11 ), a drying ( 12 ). 
     
     
         4 . A process according to  claim 3 , characterized in that the washing ( 11 ) is a multi-stage countercurrent washing. 
     
     
         5 . A process according to any of  claims 2  to  4 , characterized in that the at least one treatment step ( 11 ,  12 ) of the multi-layered spunbonded nonwoven ( 10 ) is a hydroentanglement, whereby the first and second spunbonded nonwoven ( 1 . 1 ,  1 . 2 ) within the multi-layered spunbonded nonwoven ( 10 ) still remain separable non-destructively. 
     
     
         6 . A process according to any of  claims 1  to  5 , characterized in that a drawing air stream for drawing the filaments ( 5 . 1 ,  5 . 2 ) is assigned to each of the first and the second spinnerets ( 3 . 1 ,  3 . 2 ). 
     
     
         7 . A process according to any of  claims 1  to  6 , characterized in that the spunbonded nonwoven ( 1 . 1 ,  1 . 2 ,  1 . 3 ) is a cellulosic spunbonded nonwoven ( 1 . 1 ,  1 . 2 ,  1 . 3 ) and the spinning mass ( 2 ) is a solution of cellulose in a direct solvent, particularly a tertiary amine oxide. 
     
     
         8 . A process according to any of  claims 1  to  7 , characterized in that the filaments ( 5 . 1 ,  5 . 2 ) are coagulated at least partly after they have been extruded from the first and the second spinnerets ( 3 . 1 ,  3 . 2 ). 
     
     
         9 . A process according to  claim 8 , characterized in that a coagulation air stream ( 7 . 1 ,  7 . 2 ) comprising a coagulation liquid for an at least partial coagulation of the filaments ( 5 . 1 ,  5 . 2 ) is assigned to each of the first and the second spinnerets ( 3 . 1 ,  3 . 2 ). 
     
     
         10 . A process according to  claim 9 , characterized in that the coagulation liquid is a mixture of water and a direct solvent for cellulose, particularly a tertiary amine oxide. 
     
     
         11 . A device for the production of spunbonded nonwoven ( 1 , 1 ,  1 . 2 ,  1 . 3 ), comprising at least a first spinneret ( 3 . 1 ) and a second spinneret ( 3 . 2 ) for extruding a spinning mass ( 2 ) into filaments ( 5 . 1 ,  5 . 2 ,  5 . 3 ), the spinnerets ( 3 . 1 ,  3 . 2 ,  3 . 3 ) comprising drawing devices ( 4 . 1 ,  4 . 2 ,  4 . 3 ) for drawing the extruded filaments ( 5 . 1 ,  5 . 2 ,  5 . 3 ), and comprising a conveyor belt ( 9 ) for depositing the drawn filaments ( 5 . 1 ,  5 . 2 ,  5 . 3 ) and forming at least a first and a second spunbonded nonwoven ( 1 . 1 ,  1 . 2 ), characterized in that the second spinneret ( 3 . 2 ) is arranged downstream of the first spinneret ( 3 . 1 ) in the conveying direction of the conveyor belt ( 9 ) in such a way that the second spunbonded nonwoven ( 1 . 2 ) is deposited on the conveyor belt ( 9 ) over the first spunbonded nonwoven ( 1 . 1 ) to form a multi-layered spunbonded nonwoven ( 10 ) and that the device ( 200 ,  201 ) comprises a separation device ( 13 ) fed via the conveyor belt ( 9 ) for unravelling the multi-layered spunbonded nonwoven ( 10 ) into individual spunbonded nonwovens ( 1 . 1 ,  1 . 2 ,  1 . 3 ). 
     
     
         12 . A device according to  claim 11 , characterized in that the device ( 200 ,  201 ) comprises a washing ( 11 ) to wash the multi-layered spunbonded nonwoven ( 10 ), which is arranged between the spinnerets ( 3 . 1 ,  3 . 2 ,  3 . 3 ) and the separation device ( 13 ) in the conveying direction of the conveyor belt ( 9 ). 
     
     
         13 . A device according to  claim 11  or  12 , characterized in that the device ( 200 ,  201 ) comprises at least a first and a second winding device ( 14 . 1 ,  14 . 2 ), with the winding devices ( 14 . 1 ,  14 . 2 ,  14 . 3 ) being fed by the seperation device ( 13 ). 
     
     
         14 . A device according to  claim 13 , characterized in that the device ( 200 ,  201 ) comprises at least a first and a second hydroentanglement ( 15 . 1 ,  15 . 2 ), with a hydroentanglement ( 15 . 1 ,  15 . 2 ,  15 . 3 ) being provided, in each case, between a separation device ( 13 ) and a winding device ( 14 . 1 ,  14 . 2 ,  14 . 3 ).