Mitsubishi Rayon Company, Limited

Isao Ooki

Hiroshi Hashimoto

Naoki Sugiura

Yasuyuki Fujii

Yukihiro Mizutori

Akito Hatayama

Akiyoshi Kogame

Akishige Tada

Akira Miyauchi

Masahiro Hata

A steam-drawing apparatus has supply rollthat transfers carbon-fiber-precursor acrylic fiber bundle (T) in a transfer direction of fiber bundle (T); fiber-opening devicefor opening fiber bundle (T); width control devicefor controlling the width of fiber bundle (T); steam boxto provide steam for heating fiber bundle (T) to a temperature that allows fiber bundle (T) to be drawn; and haul-off rollthat transfers fiber bundle (T) at a speed faster than that of supply roll. Using width control deviceprovided at a position between supply rolland steam box, the width of fiber bundle (T) after passing through width control deviceis set to be 65&#x2dc;110% of the width of fiber bundle (T) before entering the supply roll. The present invention proposes a method for producing a carbon-fiber-precursor acrylic fiber bundle using such a steam-drawing apparatus capable of conducting a high-speed drawing process of carbon-fiber-precursor acrylic fiber bundles at a high draw rate with stable results.

Method for producing carbon-fiber-precursor acrylic fiber bundle

A steam drawing apparatus for providing pressurized steam on running yarn to draw the yarn, comprising a steam chamber; first seal chamber adjacent to a yarn entrance of the steam chamber; and second seal chamber adjacent to a yarn exit of the steam chamber, first seal chamber and second seal chamber are each provided with a labyrinth seal section having a plurality of plate pieces, first yarn-position regulating bar is provided to prevent the running yarn from touching the plate pieces, first yarn-position regulating bar extends horizontally intersecting the running direction of the yarn at right angles, and a horizontal plane passing through the point of the first yarn-position regulating bar closest to the yarn is set at least 0.1 mm closer to the yarn than a horizontal plane passing through the tip of the plate piece closest to the yarn.

Steam drawing apparatus

Growing community of inventors

Hiroshima, Japan

Isao Ooki