Rotor spun yarns from recycled cotton spinning wastes were manufactured by means of rotor spinning process and tested for yarn imperfections and strength.Results of studies are examined the effect of cleaning intensity,cylinder speed and combing roller speed of rotor frame by using box and behnken experimental design. Observing the value of co-efficent of determination,it can be said that the properties of yarn imperfections affectedsignificantly by our selected parametres in compared with the incidence of yarn strength. Yarn imperfections (Thick place and Neps) results improve with increasing cylinder speed although higher cylinder speed shows slightly different results in case of yarn neps. Increase of opening roller speed improves yarn imperfections quality at lower cleaning intensitysetting of UNIclean and although further increase of opening roller speed hardly improves the results of yarn neps(+280%) but increases the value of thick place in yarn. Lower cleaning intensity setting gives better rotor yarn strength produced by using 100% recycled cotton wastes. Experiments based on a 60 tex rotor yarn indicate that our selected independent variables influence rotor yarn quality not linearly but quatradically with few exceptions.
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