| 摘要 |
PURPOSE: To obtain polyvinyl alcohol-based fibers suitable as a rubber- or plastic-reinforcing material having high yarn strength and resistant to repeated flex or wear for a long time. CONSTITUTION: A dimethyl sulfoxide solution of a polyvinyl alcohol >=3000 in viscosity-average polymerization degree is subjected to dry-wet spinning into fibers, which are, in turn, passed through a coagulating bath containing >=50wt.% of ethanol and then subjected to wet orientation by a factor of 4 in an ethanol/methanol liquid along with desolvation. The resultant fibers are introduced into a hot oven where the fibers are subjected to dry heat orientation at 220 deg.C so that the whole draw ratio result in >=16. Subsequently, the resultant fibers are imparted with 0.5-7wt.% of a polyamide or polyurethane resin by a touch roller system to obtaint the objective polyvinyl alcohol-based fibers >=15g/d in yarn tenacity having on the surface lateral stripes nearly rectangular to the fiber axis at a number of 0-10 on average per 100μm in the fiber length direction. |
