There are numbers of parts in Roving Machine some of them are Aprons (top and bottom), Spacer, Condenser, Flyer. In this report, we have analyzed the functions of this component and designing of a roving machine. The effect of process variables like:-lap hank, card draft, draft/doublings, and drafts at speed frame, ring frame, rotor, and air-jet spinning machine on packing density parameters of respective technology yarn was Analyzed The effect of noise variables were also accounted for. The trends of change in packing density with process variables are opposite to those of yarn diameter and helix angle of the ring, rotor, and air-jet yarns studied. The packing density is found to be the highest in air-jet yarn and the lowest in rotor yarn. An increase in the draft in air-jet spinner and decrease in rotor spinner increase packing density of the respective yarns. The change in noise variables does affect the packing density parameters of yarns.