ABSTRACT
During the manufacturing of yams and subsequent processing of synthetic fibres, yam tension should be controlled properly. There are two types of forces involved in the control of tension: one is the driving force and the other is the frictional force. In order to establish
better control of the process, the nature of the friction should be understood properly. Fibre friction is of importance simply because it is the primary property responsible for the mutual adherence of fibres during processing. Although the fundamental theory of the friction was given for plastic materials, no such concepts of friction exist for fibrous materials and polymers. The relationships, which describe the frictional characteristics of those materials, are purely empirical.
