Abstract
The optimum values for both the opening-roller speed and the yarn twist, in operating with near-extreme values of both the total draft and the rotor speed, are studied. These values of draft and speed are, nevertheless, not uncommon in industry. For a total draft of 173 and a rotor speed of 45 000 r/min, and with a Sussen Rotorbox machine, it was found that the optimum values of yarn twist and opening-roller speed did not coincide with each other when either the yarn regularity or tenacity was considered as the most important parameter, a phenomenon that had, in fact, been observed earlier when all the operating parameters were optimized. In this instance, the best quality indices are obtained for opening-roller speeds above 6000 r/min and twist multipliers, a, of about 160 for a 23.57-tex yarn (N e = 25).
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