PURPOSE: To produce the titled fiber having high elastic modulus, and useful as a tire cord, etc., by spinning a solution of an acrylonitrile polymer having a specific intrinsic viscosity, washing with water, subjecting to the primary drawing under wet heat condition, drying the product, carrying out the secondary drawing under heating with steam and post-drawing under dry heat condition.
CONSTITUTION: A solution of an acrylonitrile polymer composed mainly of acrylonitrile and having an intrinsic viscosity of ≥2.0 is used as the spinning dope, and is extruded to obtain a coagulated fiber. The fiber is washed with water, or subjected to the primary drawing under wet heat condition to a draw ratio of 2W10 simultaneous to the washing with water. The product is dried, subjected to the secondary drawing under heating with steam at an effective draw ratio of ≥12, and then to the post-drawing under dry heat condition and a drawing tension of ≥1.0g/d at a draw ratio of ≥1.05 to obtain the objective fiber having an effective draw ratio of ≥13.
| JPH04272220 | ACRYLIC HOLLOW SHEATH-CORE FIBER |
| JP3124840 | FLAT ACRYLIC SYNTHETIC FIBER AND ITS PRODUCTION |
TANAKA YOSHIYUKI
TAMAOKI HIROSHI
| JP45019414A | ||||
| JPS58120811A | 1983-07-18 | |||
| JP45039494A | ||||
| JPS55112310A | 1980-08-29 |
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