of from 0 8 to 3 0 dtex which has a crimp produced in a stuffing box with a crimp count of at least 18 crimps 10 cm as well as a finishing layer as filling material in bedding and clothing the cellulosic filling fiber used for this preferably has a blow box height ratio of between 4 and 15 preferably between 6 and 14 it may be used in mixture with downs and or feathers or alternatively in mixture with polyester polylactic acid and or polypropylene use in mixture with natural fibers such as kapok or poplar down is also possible the crimp count is determined by the method described in wo 95 24520 the opening properties relevant to practice for use as filling fiber in mixture with downs and feathers may be examined on a laboratory scale by the method described below the so called blow box test the blow box is a rectangular metal receptacle which is open on the underside and covered with an air permeable screen on the upper side the dimensions of the blow box are 20 u00d7 15 u00d7 20 cm length u00d7 width u00d7 height i e 6 l volume on the surface is found an air permeable metal screen with a mesh size of about 0 8 mm a constant stream of air which stirs up the fiber is brought in through the screen by means of a nozzle the excess air likewise escapes through the.