IMPORTANCE OF POLYMER SIZE RHEOLOGY FOR EFFICIENT SIZING OF COTTON WARP YARNS

This paper is about rheology of copolymer acryl amide and acrylic acid solution, as potential agent for warp sizing of cotton yarn as well as in the warp sizing process. The changes of rheology parameters of polymer size are analyzed depending upon concentration and temperature. Based on the results, it was determined that decrease of polymer size concentration conditions viscosity decrease. The temperature increase causes decrease of polymer solution viscosity for the same concentration. In addition, kinetic parameters at various temperatures were monitored, where i.e. activation energy of polymer size decreases with the decrease of its concentration. Higher polymer size concentration enables more deposit on the yarn. Based upon the results on polymer size features as well as on certain physical parameters of sized yarn, some rheology and kinetic parameters cause appropriate behaviour of polymer molecules in solution, which improves bonding and penetration ability into yarn, and then it directly influences on more efficient warp sizing.