Volume 1993 (1993) Issue 157 Pages 75-81
Coal-tar pitch was spun into fiber by melt-blowing method. Nozzles to feed pitch and hot airwere arranged concentrically in the die of the spinning apparatus. It was found that the size of diameter of the pitch fiber was strongly influenced by feed rates of pitch and hot air through the die, operating temperature and the diameter of the pitch nozzle, thinner fiber being obtained by applyinghigher operating temperature. The upper limit of spinnable temperature yarned according to the diameter of capillary of the pitch nozzle, smaller diameter of 0.2mm ∅ of the capillary being ableto apply higher temperature. At the optimum operating conditions using 0.2mm∅ capillary, pitch fiberhaving a diameter of 8μm was obtained at pitch-feed rate of 0.167g/min·hole. These results maybe superior to take-up roller spinning.