APPARATUS FOR PRESSURE STEAM TREATMENT OF FIBER BUNDLE AND PRODUCING METHOD OF CARBON FIBER PRECURSOR FIBER BUNDLE

摘要

Provided is a pressure steam treatment apparatus of a fiber bundle and a producing method of a carbon fiber precursor fiber bundle which are suitable for producing a carbonated precursor fiber bundle which can suppress an influence of a leakage of a pressure steam to the outside of the apparatus so as to hold down a pressure steam supply amount to the minimum, simultaneously reduce a broken yarn, improve a yield ratio and have a high productivity. A pressure steam treatment apparatus (1) is provided with labyrinth sealing chambers (3) in back and forth of a pressure steam treatment chamber (2), and treats a plurality of fiber bundles traveling in parallel like a sheet along a fiber bundle travel path (5') in a lump under a pressure steam atmosphere. The fiber bundle travel path (5') of the labyrinth sealing chamber (3) is divided in parallel to the fiber bundle. Preferably, it is divided into a plurality of paths by a partition plate (3e).