| 摘要 |
dissolving the wholly aromatic polyamide polymer of the intrinsic viscosity of above 5 in the conc. sulphuric acid solvent, which is one or a mixture of more than two selected from the group of 97-100 % conc. sulphuric acid, chloro sulphuric acid, fluoro sulphuric acid to make the spinning solution, in which the content of the polymer is 13-21 wt.%; spinning the solution through the spinneret; drawing and orienting the strands while the extruded strands go through the air stream, whose temp. satisfies the following eq. CT + 30 deg.C <= HT <= DT + 20 deg.C (where HT: temp. of the heating tank, CT: lowerest coagulation solution temp., DT: highest spinning solution temp.); forming the filament.
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