METHOD FOR PRODUCTION OF FIRE RESISTANT POLYACRYLONITRILE FIBERS FOR TEXTILE MANUFACTURING Russian patent published in 2005 - IPC

Abstract RU 2258104 C1

FIELD: production of fire resistant polyacrylonitrile textile fibers.

SUBSTANCE: claimed method includes continuous thermal treatment of continuous fiber in air media, exothermal heat discharge and pyrolysis product extraction. Continuous tows of 30-40 ktex in thickness with tows of 0.1-0.4 tex in length are heated in four steps: at 150-190°C; at 200-215°C, at 220-240°C, and 250-280°C while fiber draft is 5-30 %. Then fiber is formed to produce crimpiness of 3-7 crimps/cm. Continuous fiber may be cut on sections of 20-125 mm in length.

EFFECT: fire resistant fiber with high strength and elastic characteristics.

3 cl, 6 ex

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RU 2 258 104 C1

Authors

Kazakov M.E.

Azarova M.T.

Dates

2005-08-10—Published

2004-01-15—Filed