| abstract |
(57) [Problem] To provide a method for performing a sufficient corona discharge treatment on the surface of a synthetic fiber composed of multifilaments. SOLUTION: A synthetic fiber composed of multifilaments is passed through a discharge region in which a corona discharge is generated by applying a high voltage pulse, and at this time, a gas flow is blown on a surface of the synthetic fiber in the discharge region. I do. Further, the high-voltage pulse has a pulse width of 0.5 μsec or more and an average electric field strength expressed by applied voltage / inter-electrode distance of 4 to 200 k. V / cm, the pulse frequency is 20 times / second or more, Preferably, the synthetic fibers are polyester fibers. |