Abstract
Under the hydrodynamic lubrication of fibres and yarns, the frictional force given as a function of the amount of added lubricant has been studied.1) The following dimensional formula concerning the frictional force fi acting on the unit length of fibre or yarn is derived. where μ: the viscosity of the added lubricant, U: the sliding speed of fibre or yarn, Ri: the normal load acting on the unit length of fibre or yarn, k2: constant, N: constant (frictional index), g: the function of the dimensionless value where η is the thickness of added lubricant, K and L are constants concerning the asperities. From the above formula the frictional force fi is obtained by a certain master curve.2) It is concluded from the experimental results that the frictional force shows two types of the increase and decrease functions of the amount of added lubricant.
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