roller 9 and the second roller 11 after being doffed from the cylinder 2 the second roller 11 also provides a positive feed out conveying action for the fiber batt b as roller 11 rotates in opposite direction to that of doffer roller 9 roller 11 is mounted on axle 12 where both the roller 11 and axle 12 are held at a constant distance from cylinder 2 and doffer roller 9 by a pair of link arms 13 link arms 13 pivot about axle 4 in the embodiment shown four solid removable end panels 14 cover two openings in each end face of cylinder 2 end panels 14 allow access to the interior of cylinder 2 for cleaning and inspection when they are removed end panels 14 also seal the ends of cylinder 2 so a proper amount of air flows through the perforated surface 3 a proper amount of air is needed to introduce moisture to the batt as well as having the batt flow through the apparatus as discussed in more detail below a pressure gradient is formed across the cylinder 2 sufficient to force air perpendicularly through the batt b cylinder 2 upper surface and cylinder 2 lower surface for the purposes of discussion herein the upper surface of the cylinder 2 refers to that portion of the cylinder 2 residing proximate to the inlet air plenum 7 similarly the lower surface of the cylinder 2 refers to the portion of the cylinder 2 proximate to the exhaust air plenum 15 the pressure gradient across the cylinder 2 is formed by the combination of the forced air flow exiting the air louvers 8 and.