抄録
The mechanism of the softening action of the textile oiling agent is discussed based on the evaluation of torsional rigidity, coefficient of friction and Young_??_s modulus.
Torsional rigidity is evaluated from following formula.
T: moment of torsion (kg_??_mm)
G: rigidity of phosphor bronze wire (kg/mm2)
l: length of phosphor bronze wire (mm)
D: diameter of phosphor bronze wire (mm)
θ: torsion angle of indicator (degree)
The following formula is derived from the above formula
where K: constant
The torsional rigidity in this experiment is estimated from the relation between θ and the number of torsion of the sample.
The shearing stress (T′) was calculated from the following formula.
where d: diameter of sample (mm)
Torsional rigidity of raw silk decreases markedly by treating with some oiling agents. Similar result is observed with 6 Nylon (Amilan) monofilament in less degree.
In the case of viscose rayon, torsional rigidity of multifilament yarn decreases by treating with oiling agents, but this appears attributable to the decrease of the coefficient of friction, because the torsional rigidity of viscose monofilament is never affected by oiling agent.
