Transverse Sphere and Texture of Carbon Fibers Prepared through Cross Shaped Nozzles of Different Lobe Dimensions

Yozo Korai,youzou   kourai,Hidetoshi Oka,Seong-Hwa Hong,seiwa   kou,Isao Mochida,isao   motida,Isamu Kato,youzou   kourai,hidetosi   oka,sonfu a   hon,isao   motida,isamu   katou

Transverse Sphere and Texture of Carbon Fibers Prepared through Cross Shaped Nozzles of Different Lobe Dimensions

1999

Methylnaphthalene mesophase pitch was spun through Y- and cross- shaped nozzles of different lobe dimensions in temperature range of 280 to 295°C by fixing the spinning rate to evaluate die-swelling phenomena which defonned cross-sectional shape and domain alignment of the carbon fiber. The higher temperature of spinning enhanced the refonnation through the lower viscosity. The thinner lobe emphasized the die-swelling through the larger shear rate, which reduces the viscosity, although the nozzles of the present study had the same cross-sectional area. Shape factors of the nozzle and fiber rescribe the extents of cause and results of die-swelling, respectively. Die-swelling is found to change the radial type alignment of the constituent domains to random order. The degrees of preferred orientation along the fiber axis were slightly influenced by die-swelling. The pressure in spinning and the nozzle shape were correlated to the reformation extent of the resultant fiber.

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