| 摘要 |
PURPOSE:To stably and efficiently obtain a polycapramide fiber having high strength, good dimensional stability and fatigue resistance, by spinning, drawing and vulcanizing a polycapramide having high polymerization degree in specific condition. CONSTITUTION:A highly polymerized polycapramide having at least >=95mol% epsilon-capramide unit and >=3.0 relative viscosity in sulfuric acid is spun from a spinneret 2 in a melt state and cooled and solidified in a pressure spinning cylinder 11 kept in >=1kg/cm<2> higher pressure than atmospheric pressure. A polymer amount per pore of the spinneret is 2.5g/min and the winding speed is >=1,500m/min and the double refractive index of the wound fiber is >=2X10<-3>. A heating cylinder 3 is provided directly under the spinneret and atmospheric temperature in an area of >=10cm is +30 deg.C higher than a melting point of the polyamide and pressure fluid is blown from a device 5 for blowing a circular cool wind. The resultant spun filament is drawn in maximum draw power of >=90% and total draw power of 1.2-3.5 times by a thermal drawing method having two or more stages.
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