| 摘要 |
PURPOSE:To obtain yarn having high wet heat resistance and high rubber fatigue resistance while maintaining high strength and high modulus of elasticity by uniformly acetalizing polyvinyl (PVA)-based yarn having >=5,000 viscosity- average polymerization degree continuously in a short time. CONSTITUTION:In a method for acetalizing PVA-based drawn yarn having >=5,000 viscosity-average polymerization degree and >=110 deg.C hot water breakage temperature, the yarn is previously swollen in a liquid bath (hot water) at 40-95 deg.C, then immersed in an acetalizing solution at 40-90 deg.C and treated so as to have 2-15mol% acetalization degree and successively washed with water and dried under tension to continuously acetalize PVA-based yarn. |
