繊維学会誌
Online ISSN : 1884-2259
Print ISSN : 0037-9875
単繊維の帯電性評価の一方法
若山 一夫佐々木 正剛津田 年勝
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1982 年 38 巻 10 号 p. T407-T412

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Single fibers uniformly electrified were grounded to release the electric charge through the both ends of each sample. Decay of the electrification of the fibers, then, was observed by detecting photo-electrically the amplitude of fibers which were transversely vibrating in resonance with the alternating electrostatic force.
On the assumption that these fibers can be regarded as cylindrical conductors, it is then possible to calculate expressions of the distribution of electric potential V(x, t) and the total charge Q(t) of the conductors in process of the decay of charge.
where cs is the surface electric capacity per unit axial length, rs the surface electric resistance per unit length, V0 the initial electric potential and l the length of the conductors electrified.
The expression Q(t) means that the logarithmic decay of the total charge is linear with time holding the inclination (π/l)2/cs rs after a while since the decay has started. It, therefore, was checked with the solution displayed by the analog-computor and compared with the electrical detection of the amplitude of vibrating fibers.
The time constant cs rs estimated from this experimental method has clear physical meanings in contrast to the CR which is conventionally used as the lumped constant of fibers and fiber assemblies.

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