Study of Effect of Rotor Speed, Combing-Roll Speed and Type of Recycled Waste on Rotor Yarn Quality Using Response Surface Methodology

Abstract

A three factors, three level for two factors, i.e. combing roll speed and rotor speed and pneumafil percentage as a categorical factor, face centered central composite design (CCD) was used and response surface methodology was applied to determine the interactions of selected independent variables on rotor spun yarn quality prepared by using 100% recycled spinning waste. The influence of these three independent variables on the four dependent responses, i.e. total imperfections, yarn CSP value, elongation% and end breakage rate was evaluated. Results indicate that rotor speed 85000 rpm and combing roll speed 8500 rpm gives best result in terms of yarn CSP value and elongation% of 16 Ne rotor spun yarn produced from 100% recycled spinning waste. Ends breakage increased drastically at increasing rotor speed and combing roll speed but it can be minimized by using pneumafil in recycled fiber mixing. In addition, yarn quality can be improved up to 5-25% by using 15% pneumafil instead of comber noil for any level of rotor speed and combing-roll