METHOD OF PRODUCING POLYACRYLONITRILE FIBRE AND METHOD OF PRODUCING CARBON FIBRE Russian patent published in 2014 - IPC D01F6/18 D01F9/22 

FIELD: chemistry.

SUBSTANCE: method includes a spinning process, first drawing, drying and second drawing. Second drawing includes any process from (a)-(c): (a) drawing on air, where temperature of the thread from its point of separation on a hot roller to the point of first contact on the next roller is 130°C or higher, (b) drawing, where the distance from the point of separation of the thread on a hot roller to the point of its first contact on the next roller is equal to or less than 20 cm, (c) drawing in the drawing zone of a hot plate, where the hot plate is situated between two rollers, one of which is a heating roller which is mounted in front of the drawing zone of the hot plate, and the hot plate is placed such that the initial point of contact between the hot plate and the thread is at a distance of 30 cm or less from the point of separation of the thread on the heating roller, and the rotational speed of the heating roller is 100 m/min or more.

EFFECT: improved method.

10 cl, 8 dwg, 10 tbl, 57 ex