In recent years the demand for cotton goods has been growing throughout the
world, due to their very good usable and hygienic properties, such as hygr
oscopicity, softness and ail permeability. About 50% of cotton yarns are ma
nufactured on rotor spinning machines. The paper presents an analysis of qu
ality parameters of cotton yarns 20 tex, manufactured on different types Of
rotor spinning machines of the 2nd and 3rd generation, as used also in Pol
and.