| 摘要 |
PURPOSE:To carry out the heat treatment of a pitch fiber bundle without causing the breakage and slack of the bundle, by dividing an infusibilization furnace and optionally a carbonization furnace into plural sections having different temperatures, and controlling the driving speed of rollers by using dancer rollers furnished with position detection means. CONSTITUTION:The heat treatment furnace 4 composed of an infusibilization furnace and optionally a carbonization furnace, is divided into plural sections 4', 4'', ... having different temperatures to form a temperature gradient in the furnace, and a dancer roller 6' is placed in each section. The tension applied to the pitch fiber bundle 1 is detected from the position of the dancer roller 6', and the driving speeds of the rollers 5, 6, the delivery roller 2 and the take-up roller 7 are controlled according to the measured tension. The variation of the tension applied to the pitch fiber bundle 1 can be minimized, and the breakage of the bundle can be prevented by this process. |
