Spinning apparatus for producing fine threads by splicing

Abstract

A spinning apparatus for producing fine threads by splicing, which comprises a plurality of protruding spinneret jets disposed in a spinneret jet portion and having spinning orifices from which the spinning dopes exit as monofils and having a plurality of acceleration jets, in particular Laval jets, whose cross section reduces, only to widen downstream of the smallest cross section, which are assigned to the spinning orifices is proposed to be provided with means for feeding gas streams which surround the monofils and are accelerated by the acceleration jets. The acceleration jet, in an at least partially plate-shaped gas jet portion, is constructed as a funnel-shaped depression into which the spinneret jet reaches to form gas flow channels. Means for relative displacement of the gas jet part and of the spinneret jet part relative to one another are provided such that the flow cross section of the gas flow channels is alterable and/or the position of the smallest cross section of the acceleration jets is adjustable in relation to the spinning orifices.

1 - 15 . (canceled) 
   
   
       16 . A spinning device for producing fine threads by splitting, the spinning device having a plurality of protruding spinning nozzles with spinning openings which are disposed in a spinning nozzle part and from which the spinning materials emerge as monofilaments, the spinning device further having a plurality of Laval acceleration nozzles which are assigned to the spinning openings, the cross-sections of the acceleration nozzles reducing and then widening after the smallest cross-section, at least one source for supplying gas flows which surround the monofilaments and are accelerated through the acceleration nozzles, each acceleration nozzle being configured in an at least partially plate-shaped gas nozzle part as a funnel-shaped depression into which the spinning nozzle engages forming gas flow channels, the device further including means for relative displacement of the respective gas nozzle part and the spinning nozzle part relative to each other so that at least one of the following can be achieved: the flow cross-section of the gas flow channels can be changed; and the position of the smallest cross-section of the acceleration nozzles can be adjusted relative to the spinning openings. 
   
   
       17 . A spinning device according to  claim 16  wherein the means for relative displacement comprises at least one of guides and sliding rods. 
   
   
       18 . A spinning device according to  claim 16  wherein the means for relative displacement comprises an adjustment screw device which is disposed between the gas nozzle part and the spinning nozzle part. 
   
   
       19 . A spinning device according to  claim 16  wherein a gas chamber with at least one gas supply is provided between the spinning nozzle part and the gas nozzle part, the gas chamber being in communication with the gas flow channels, the spinning nozzles protruding into the gas chamber. 
   
   
       20 . A spinning device according to  claim 16  wherein the gas nozzle part is provided with a frame-like edging, the region of the spinning nozzle part including the protruding spinning nozzles being inserted within the edging. 
   
   
       21 . A spinning device according to  claim 16  further comprising a self-adjusting seal between the spinning nozzle part and the gas nozzle part. 
   
   
       22 . A spinning device according to  claim 16  wherein the gas nozzle part is configured as a hollow body which is engaged by the funnel-shaped depressions, the space within the hollow body forming a gas chamber provided with openings directed towards the spinning part, which connects the gas chamber to the gas flow channels. 
   
   
       23 . A spinning device according to  claim 22  wherein the openings are disposed annularly around the funnel-shaped depressions. 
   
   
       24 . A spinning device according to  claim 16  further including a formed part between the spinning nozzle of the spinning part and the gas nozzle part maintaining air gaps for heat insulation, which gaps extend substantially to the spinning openings. 
   
   
       25 . A spinning device according to  claim 24  wherein the gas flow channels are provided between the formed parts and the gas nozzle part. 
   
   
       26 . A spinning device according to  claim 16  wherein the gas chamber is sealed externally. 
   
   
       27 . A spinning device according to  claim 16  wherein the gas nozzle part and the spinning nozzle part comprise a plurality of funnel-shaped depressions and spinning nozzles which are disposed in rows adjacent to each other, the spinning nozzles of one row being disposed offset relative to the acceleration nozzles of the other row. 
   
   
       28 . A spinning device according to  claim 16  wherein the combination of gas nozzle part and spinning nozzle part comprises a plurality of gas nozzle part segments and spinning nozzle part segments which are exchangeable respectively. 
   
   
       29 . A spinning device according to  claim 16  further including a distribution device for an additional fluid, the distribution device provided on the gas nozzle part at a spacing from the exit of the acceleration nozzles, the additional fluid impinging upon the threads which have split from the monofilament. 
   
   
       30 . A spinning device for the production of lyocell threads by splitting, the spinning device having a plurality of protruding spinning nozzles with spinning openings which are disposed in a spinning nozzle part and from which the spinning materials emerge as monofilaments, the spinning device further having a plurality of Laval acceleration nozzles which are assigned to the spinning openings, the cross-sections of the acceleration nozzles reducing and then widening after the smallest cross-section, at least one source for supplying gas flows which surround the monofilaments and are accelerated through the acceleration nozzles, each acceleration nozzle being configured in an at least partially plate-shaped gas nozzle part as a funnel-shaped depression into which the spinning nozzle engages forming gas flow channels, the device further including means for relative displacement of the respective gas nozzle part and the spinning nozzle part relative to each other so that at least one of the following can be achieved: the flow cross-section of the gas flow channels can be changed; and the position of the smallest cross-section of the acceleration nozzles can be adjusted relative to the spinning openings, the spinning device further including a distribution device for water, the distribution device provided on the gas nozzle part at a spacing from the exit of the acceleration nozzles, the water impinging upon the threads which have split from the monofilament. 
   
   
       31 . Spunlaid nonwovens produced by providing a plurality of protruding spinning nozzles with spinning openings which are disposed in a spinning nozzle part and from which the spinning materials emerge as monofilaments, providing in an at least partially plate-shaped gas nozzle part as a funnel-shaped depression into which the spinning nozzle engages forming gas flow channels a plurality of Laval acceleration nozzles which are assigned to the spinning openings, the cross-sections of the acceleration nozzles reducing and then widening after the smallest cross-section, providing at least one source for supplying gas flows which surround the monofilaments and are accelerated through the acceleration nozzles, providing for relative displacement of the respective gas nozzle part and the spinning nozzle part relative to each other, and at least one of the following: changing the flow cross-section of the gas flow channels; and adjusting the position of the smallest cross-section of the acceleration nozzles relative to the spinning openings.