The effect of hot‐wet draw ratio on the coefficient of friction of wet‐spun acrylic yarns

A series of wet‐spun poly(acrylonitrile‐co‐vinyl acetate) yarns that were hot‐wet stretched to a draw ratio range of 2.0 × −7.0 × were made for study of surface morphology and frictional characteristics. These yarns show an increase in draw ratio. The fiber to fiber coefficient of friction, measured parallel (line contact), and perpendicular (point contact), increases with draw ratio, giving an excellent correlation between orientation and friction. The effects of hot‐wet draw ratio on the surface structure and its frictional behavior are discussed.