METHOD OF PRODUCING HIGH-STRENGTH HIGH-MODULUS ARAMID FIBRES Russian patent published in 2014 - IPC D01F6/60 D01F6/74 

FIELD: chemistry.

SUBSTANCE: invention relates to production of chemical fibres and a method of producing high-strength, high-modulus aramid fibres. The method includes wet or dry-and-wet moulding of a solution of an aromatic heterocyclic copolyamide with a para-structure in a water-amide settling bath, followed by plastification of by stretching to 120%, washing, two-step drying with brief immersion of the fibres between the drying steps into a composition with a hydrophobisation organosilicon liquid, followed by heat treatment and hot-stretching. The two-step drying includes preliminary drying of the fibres at 120-150°C to moisture content of 60-80% under tension of 1-5 cN/tex and final drying at 120-150°C to moisture content of 7.0-20% under tension of 0.1-0.3 cN/tex.

EFFECT: invention enables to obtain high-strength, high-modulus aramid fibres with an improved set of physical-mechanical and operational characteristics.

4 cl, 1 tbl, 8 ex