ROLE OF INTERFACIAL FRICTION AND LUBRICATION IN YARN AND FABRIC MECHANICS

We describe an experimental study of the effects of various surface treatments on the frictional and tensile properties of cotton and aramid single yarns and also on the mechanical properties of fabrics woven from these yarns. Lubrication of the yarn or fabric generally reduces those parameters that quantitatively describe the properties mentioned above. We present values for the coefficient of friction, the tensile modulus of single yarns, and also specific parameters that describe the way in which these yarns respond when they are pulled out of the corresponding fabrics. We report the behavior of both untreated and lubricated yarns and their fabrics, interpreting the reduction in frictional and tensile parameters of the yarns and the increase in the compliance of the weaves in terms of the changes brought about in interfilament and interyarn friction.