DEVICE FOR TREATING CARBON-FIBER-PRECURSOR ACRYLIC YARN WITH PRESSURIZED STEAM, AND PROCESS FOR PRODUCING ACRYLIC YARN

摘要

This device (1) for treating an acrylic yarn with pressurized steam is equipped with a pressurized-steam treatment part (10) and labyrinth seal parts (20). The labyrinth seal parts (20) have been disposed respectively at the yarn inlet and yarn outlet of the pressurized-steam treatment part (10), have a running path for the yarn (Z) in a horizontal direction, and have a plurality of labyrinth nozzles (24) over and under the running path. When the temperature of the atmosphere inside the labyrinth seal parts (20) is 140ºC, the difference (?H) between the maximum and minimum values of the vertical-direction distance between the upper labyrinth nozzle (24) and lower labyrinth nozzle (24) of each opposed pair is 0.5 mm or less. Thus, the energy cost due to leakage of pressurized steam can be reduced. In addition, the device can be prevented from thermally deforming, and the yarn can simultaneously be prevented from fluffing or breaking.