that will create resistance to the movement of boundary layer air along the disperser roll 50 such as different surface configurations or air jets baffles and other suitable devices the shroud 60 illustrated in fig2 is simply a preferred arrangement for the present invention referring again to fig1 the disperser roll 50 carries the fiber from the main carding roll 40 under shroud 60 and to an air duct 70 in the air duct 70 an air stream is arranged to pass over the surface of the disperser roll 50 in a generally tangential relationship to receive the fiber being doffed from the disperser roll 50 the fiber is quite likely to doff from the disperser roll 50 without the presence of the air stream creating a cloud of individualized fiber however it is preferred to provide the individualized fiber into an air stream where it may be more easily handled in the present invention it is preferred that the air stream be generally free of turbulence so as to allow the fiber to be evenly dispersed throughout the air stream eddies vortices and other turbulence tend to disturb the distribution of the fiber in the air duct 70 which causes undesirable consequences depending on the use that will be made with the fiber in the air stream in the case where a web is produced as shown in the drawing figures such webs have splotchiness and non uniformity 39 s cause by the fiber following the vortices and eddies and not laying down evenly thus as shown in the drawing figures an air stream is created in the air duct 70.