yarn strands derived from a creel are compressed together in parallel orientation and moved forward by reciprocating clamping means . a knife periodically severs a bundle comprising preselected short yarn lengths , which is compressed together and dropped into a chute . an impeller pushes each bundle through the wedge - shaped lower end of the reciprocating chute which extends in turn into each of a series of plastic bags being furnished from a roll or by an associated machine . the filled bag is sealed , cut loose and tossed into a bin .