Method and system for producing dressing products of polymer fibres useful for covering moist wounds

Abstract

The invention provides a method and system for producing an improved dressing product, useful for covering/protecting a moist wound. The dressing product comprising fibres of a spinnable polymer forming a twisted ribbon. By virtue of this twisting, the fibres, in particular at the periphery of the ribbon, are connected to one another so as to afford better mechanical cohesion and a smoother outer appearance, without affecting the action of absorption, dilation and gel formation for extracting the biological fluid, nor the action of retention of proteins and other cellular and bacterial waste matter which would impede the phenomenon of cicatrization. The ribbon twisting equipment comprises a conical bowl ( 1 ) for driving fibres in rotation with a twisting die ( 3 ) in its narrowed downstream part ( 2 ), and a means ( 4 ) for driving in rotation.

1 . A dressing product useful for covering a moist wound, said dressing product comprising: 
 fibres of a spinnable polymer forming a substantially cylindrical ribbon, characterized in that the ribbon is twisted.    
     
     
         2 . The dressing product according to  claim 1 , in which the twisted ribbon comprises a traceabile filament.  
     
     
         3 . A method for producing a dressing product useful for covering a moist wound, comprising the steps of: 
 forming a substantially cylindrical ribbon from fibres of a spinnable polymer by driving the fibres in rotation downstream of a card, and by passing the fibres through a twisting die to obtain a twisted ribbon.    
     
     
         4 . The method according to  claim 3 , further comprising the step of: 
 passing the twisted ribbon through a pressure calender for fixing the shape of the fibres.    
     
     
         5 . The method according to  claim 3 , in which, when a ribbon of fibres is driven in rotation, before and after it is driven in rotation and twisted, it is passed through an upstream calender and downstream calender, thereby limiting the zone of twisting.  
     
     
         6 . The method according to  claim 5 , in which the downstream calender serves as a pressure calender.  
     
     
         7 . The method according to  claim 3 , further comprising the step of: 
 driving the fibres of a web emerging from the card in rotation.    
     
     
         8 . The method according to  claim 7 , further comprising the step of: 
 guiding the web before the driving step.    
     
     
         9 . The method according to  claim 8 , in which the web is guided by the action of jets of air on the borders of the web.  
     
     
         10 . A dressing product produced by the method of  claim 3 .  
     
     
         11 . An equipment for twisting the fibres of a spinnable polymer of a dressing product, comprising: 
 a conical bowl for driving the fibres in rotation with a twisting die in its narrowed downstream part; and    a means for driving the conical bowl in rotation.    
     
     
         12 . The equipment according to  claim 11 , in which the means for driving the conical bowl comprises a wheel gear.  
     
     
         13 . The equipment according to  claim 11 , in which the means for driving the conical bowl comprises a drive belt.  
     
     
         14 . The equipment according to  claim 11 , further comprising: 
 a calender for pressing and fixing the shape of the fibres.    
     
     
         15 . The equipment according to  claim 11 , further comprising: 
 calenders for limiting the zone of twisting of a ribbon of fibres.    
     
     
         16 . The equipment according to  claim 15 , in which 
 the calendars consist an upstream calender and a downstream calender.    
     
     
         17 . A dressing product produced by the equipment of  claim 11.