Device for forming by carding one or more fleeces of fibres, in particular non-woven

Abstract

Devices and methods for forming by carding one or more fleece(s) of fibres including a main carding drum supplied with raw fibres, one or more doffer cylinder(s) capable of removing the fibres worked on the carding drum and an associated stripper roller to strip the fleece(s) of fibres formed on the or each doffer and deposit them on one or more output belts. The device and methods also include at least one comb-cleaner flywheel capable of interacting with at least one doffer cylinder to remove dust and impurities therefrom, characterised in that it/they is/are fitted with prevention means which are configured so as to prevent the dust and impurities removed from the comb by the cleaner flywheel from escaping in the direction of the associated stripper roller.

1 . A method for producing at least one fleece of fibers with few or no holes therein, comprising the steps of:
 supplying a carding drum with raw fibres so as to obtain carded fibers;   collecting with at least one doffer roller said carded fibres from said carding drum to form at least one fleece of fibers;   stripping said at least one fleece of fibres formed on said at least one doffer roller and depositing said at least one fleece of fibres on at least one output belt, the method also comprising:   removing with at least one doffer cleaner flywheel dust and impurities from said at least one doffer roller at an interface between said at least one doffer cleaner flywheel and said at least one doffer roller;   preventing said dust and impurities removed at the interface from escaping from said at least one doffer cleaner flywheel in a direction of the at least one stripper roller, so that said dust and impurities do not fall on said at least one fleece of fibers deposited on said at least one output belt; and   obtaining said at least one fleece of fibers with few or no holes from said output belt.   
     
     
         2 . The method of  claim 1 , wherein the removed impurities or dust are sent from said interface to the main carding drum along a path being the shortest path between the interface and the carding drum. 
     
     
         3 . The method of  claim 1 , wherein the at least one doffer roller is rotated in a direction opposite to a direction in which said carding drum is rotated and the at least one doffer cleaner flywheel is rotated in said opposite direction. 
     
     
         4 . The method of  claim 1 , wherein the preventing step comprises arranging a screen between the interface and the at least one stripper roller. 
     
     
         5 . The method of  claim 1 , wherein at least one carding drum cleaner flywheel is arranged upstream of said at least one doffer roller. 
     
     
         6 . The method of  claim 5 , further comprising arranging at least one downstream airtight roller downstream of the at least one carding drum cleaner flywheel, the at least one downstream airtight roller and the at least one carding drum cleaner flywheel being rotated in a same direction. 
     
     
         7 . The method of  claim 6 , wherein the at least one downstream airtight roller is arranged to brush the at least one doffer cleaner flywheel. 
     
     
         8 . The method of  claim 5 , further comprising the step of arranging an intermediate roller between the carding drum and the at least one doffer roller, so that said intermediate roller prevents a vacuum from forming in a space between the carding drum and the at least one doffer roller. 
     
     
         9 . The method of  claim 8 , wherein the intermediate roller is located below the at least one downstream airtight roller. 
     
     
         10 . The method of  claim 1 , comprising the step of providing two doffer rollers, upper and lower respectively, two respective upper and lower doffer cleaner flywheels, two respective upper and lower stripper rollers and an additional drum cleaner flywheel arranged upstream of the upper doffer roller and at least one downstream upper airtight roller downstream of the drum cleaner flywheel. 
     
     
         11 . The method of  claim 10 , wherein the upper doffer flywheel cleaner is rotated in a direction opposite to a direction in which the upper doffer roller is rotated and the lower doffer cleaner flywheel is rotated in a direction opposite to a direction of in which the lower doffer roller is rotated. 
     
     
         12 . The method of  claim 6 , wherein it comprises providing two airtight rollers, downstream and upstream, respectively of the carding drum cleaner flywheel. 
     
     
         13 . The method of  claim 12 , wherein each of the two airtight rollers is rotated in a direction opposite to a direction in which the carding drum is rotated. 
     
     
         14 . A method for forming at least one fleece of fibers, comprising the steps of:
 supplying a carding drum with raw fibres so as to obtain carded fibers;   collecting with at least one doffer roller said carded fibres directly from said carding drum to form at least one fleece of fibers;   stripping said at least one fleece of fibres formed on said at least one doffer roller and depositing said at least one fleece of fibres on at least one output belt, the method also comprising:   removing with at least one doffer cleaner flywheel dust and impurities from said at least one doffer roller at an interface between said at least one doffer cleaner flywheel and said at least one doffer roller; and   wherein said at least one doffer cleaner flywheel is rotated in a first direction, said at least one doffer roller is rotated in a second direction, said second direction being opposite to said first direction, and   wherein a peripheral speed of said at least one doffer cleaner flywheel is selected to be less than a peripheral speed of said at least doffer roller.   
     
     
         15 . The method of  claim 14 , wherein said carding drum is rotated in a third direction, said third direction being identical to said first direction. 
     
     
         16 . The method of  claim 15 , wherein the removed impurities or dust are sent from said interface to the carding drum along a path being the shortest path between the interface and the carding drum.