抄録
The interfibre frictions induced on a fibre in a sliver by twisting procedure consist of both forces to resist fibre extension and fiber torsion. The component of friction due to fibre extension was observed previously as the withdrawal force of a single fibre from the bundle. In this work, the rolling friction due to fiber torsion in twisted sliver is investigated by using the mechanical model in which a filament is inserted into a comprssed bundle and measuring the critical torsional moment M necessary to slip this filament in the bundle as a function of the load R.
The experimental results on the torsional friction between Nylon bristle inserted perpendicularly in Nylon bundle is as follow:
1) The value of torsional friction M increases with the increasingly applied load R on bundle as the relation of;
M=αRn
with parameters α and n. This relation is almost independent on the rotational speed of filament.
2) The quantitative relation between the moment due to torsional friction M and the force due to withdrawal friction F of the filament in bundle is expressed by;
M=rF,
where r is the radius of the filament.
3) The moment of torsional friction M increases with the increasing number N of crossing fibres to the filament, as the relation of;
M=α0N(1-n)Rn
where α0 is the value of friction parameter in the case of N=1
On the bases of these elementary properties on the torsional friction between filaments the concrete investigation on the mechanical behavior of the twisted sliver will may be developed in future.
