Theoretical orientation density function of spunbonded nonwoven fabric

The orientation density function of spunbonded nonwoven fabric is defined a nd theoretically derived in this paper. The density function is allowed to vary according to such variables as the feeding velocity of filaments, the moving velocity of the conveyor belt, and the oscillating velocity of the a spirator, all of which affect the manufacturing process of spunbonded nonwo ven fabric. The number of fibers oriented in the cross-machine direction in creases as the oscillating velocity of the aspirator accelerates. The veloc ity of the moving conveyor belt significantly increases the number of fiber s oriented to the machine direction. The derived density function is used t o estimate the orientation distribution of spunbonded nonwoven fabric accor ding to different values of variables, and it may help to design the mechan ical properties of spunbonded nonwoven fabric.