Patent ID: 7349756

Claim:
A method for starting or stopping each of at least three rolls ( 26 , 34 , 42 ) arranged in at least two separately controllable roll-sets used for processing a yarn (Y) in a stretch-break process, each roll-set comprising at least two of the rolls, the stretch-break process including at least one jet consolidation device ( 32 , 36 , 52 ), the method comprising the steps of: a) for each roll-set, changing the speed of each roll from an initial condition to a steady state condition in coordination with a change in speed of at least one of the other rolls in accordance with a predetermined sequence, wherein the predetermined sequence is created by the steps of: i) selecting a candidate speed for each of the three rolls; ii) validating the candidate speed for each roll against predetermined operability criteria; and iii) for speeds that meet the operability criteria, setting the speed for each of the three rolls; and b) selecting at least one operating parameter for the jet, wherein the jet operating parameter comprises an operating pressure and wherein the operating pressure is selected in at least two discrete steps, such that simultaneous complete breakage of a yarn (Y) being processed in a stretch-break process is minimized.