Card including an accumulator transfer cylinder, and a method of producing a non-woven web

Abstract

The card has an accumulator transfer cylinder between the carding drum and the first cylinder for forming a non-woven web. In order to take up fibers from the periphery of the carding drum, the accumulator transfer cylinder preferably has clothing comprising a plurality of teeth that are inclined relative to the radius of the accumulator transfer cylinder and oriented in the direction of rotation of said cylinder. When the card is in operation, the accumulator transfer cylinder is driven in the opposite direction of rotation to the direction of rotation of the carding drum and at a circumferential speed greater than the circumferential speed of the carding drum.

1 . A card comprising a carding drum, carding members mounted at the periphery of the carding drum, and at least one card outlet having at least a first cylinder for forming a non-woven web, the card including an accumulator transfer cylinder between the carding drum and the first cylinder for forming a non-woven web.  
     
     
         2 . A card according to  claim 1 , wherein, in order to be able to take up fibers from the periphery of the carding drum, the accumulator transfer cylinder has clothing comprising a plurality of teeth that are inclined relative to the radius of the accumulator transfer cylinder and oriented in the direction of rotation of said cylinder, and wherein, when the card is in operation, the accumulator transfer cylinder is driven in a direction of rotation opposite to the direction of rotation of the carding drum and at a circumferential speed greater than the circumferential speed of the carding drum.  
     
     
         3 . A card according to  claim 2 , wherein the circumferential speed of the carding drum and the circumferential speed of the accumulator transfer cylinder are adjusted in such a manner that the speed ratio is greater than or equal to 1.2, and preferably greater than or equal to 1.3.  
     
     
         4 . A card according to  claim 1 , wherein the accumulator transfer cylinder has clothing, and the speed of rotation of the accumulator transfer cylinder is adjusted in such a manner that when the card is in operation, the accumulator transfer cylinder picks up on each revolution of the carding drum more than 90% and preferably picks up 100% of the fibers transported at the periphery of the carding drum.  
     
     
         5 . A card according to  claim 1 , wherein the diameter of the accumulator transfer cylinder is less than the diameter of the carding drum.  
     
     
         6 . A card according to  claim 1 , having two outlets, each comprising a first web-forming cylinder adjacent to the same accumulator transfer cylinder.  
     
     
         7 . A card according to  claim 1 , wherein the first cylinder forming a non-woven web is a combing cylinder.  
     
     
         8 . A card according to  claim 7 , wherein the combing cylinder is followed by a single condenser cylinder.  
     
     
         9 . A card according to  claim 1 , wherein the first cylinder for forming a non-woven web is a drum-backing cylinder.  
     
     
         10 . A card according to  claim 1 , having one or more carding members mounted at the periphery of the accumulator transfer cylinder and preferably positioned in a region situated upstream from the transfer zone(s) between the accumulator transfer cylinder and each first cylinder for forming a non-woven web.  
     
     
         11 . A method of producing a non-woven web by means of a card as specified in  claim 1 .  
     
     
         12 . A method according to  claim 11 , wherein, on each revolution of the carding drum, the accumulator transfer cylinder is used to pick up more than 90%, and preferably to pick up 100% of the fibers transported on the periphery of the carding drum.