PURPOSE: To suppress orientation relaxing in flameproofing and obtain the titled precursor, having a specific strength, maximum draw ratio and maximum developing tension, by finally drawing fibers consisting of acrylonitrile, etc., heat-setting the drawn fibers and relaxing the fibers in, before and after the above-mentioned treatment.
CONSTITUTION: A polymer, having at least 5.5g/d strength and containing ≥90wt% acrylonitrile is spun, drawn and finally drawn to give a precursor, which is then subjected to heat-setting treatment at the maximum temperature of 150W220°C and relaxed in, before and after the heat-setting treatment within the range of 3W10% to afford the aimed precursor, having 5.5W7g/d strength, 115W140% maximum draw ratio during residence in hot air at 240°C for 2min and 0.3W0.4g/d maximum developing tension when treated in hot air at 240°C for 2min and useful for carbon fibers.
KASHIWAGI YASUHIRO
MATSUBARA NOBUYUKI
| JPS5324457A | 1978-03-07 | |||
| JPS53122821A | 1978-10-26 | |||
| JPS53139824A | 1978-12-06 | |||
| JPS5530472A | 1980-03-04 | |||
| JPS5324427A | 1978-03-07 |
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