Abstract
On the non-hydrodynamic lubrication of fibres and yarns lubricated by liquid lubricant, the following behaviours have been observed:
1) The viscosity of the lubricant deposited at the outside of the asperity deformed by load has not influence on friction, except in the case of very light loading like a monofilament sliding on the smooth body.
2) The asperity of fibre may be softened by adding a lubricant. Therefore, the frictional force may increase by increasing amount of the lubricant added.
On the friction of fibres and yarns lubricated by solid lubricant, the following behaviours have been noted:
a) The frictional behaviour to variable sliding speed may be qualitatively similar to the lubrication by liquid lubricant.
b) The asperity of fibre may hardly be softened by adding a solid lubricant.
