| 摘要 |
PURPOSE:To obtain the subject fiber, excellent in productivity, high strength and hot water resistance and useful as industrial materials, etc., by applying an acid to yarn of PVA having a prescribed liquid content or above before dry hot drawing so as to provide a pickup within a specific range, drying the resultant yarn and dry hot drawing the dried yarn at a high temperature and a high draw ratio. CONSTITUTION:A spinning solution containing PVA dissolved therein is wet or dry-jet wet spun into an organic solvent-based coagulation bath such as dimethyl sulfoxide at <=20 deg.C and then dry hot drawn to produce PVA-based fiber. In the process, an acid such as phosphoric acid is brought into contact with the yarn with >=30%/PVA liquid content in a step before dry hot drawing so as to provide 5-10000ppm pickup thereof based on the PVA. The resultant yarn is then dried and dry hot drawn at >=220 deg.C so as to afford >=15 times total draw ratio. |
