| 摘要 |
PURPOSE:To obtain high-strength polyhexamethylene adipamide yarn having high strength and high modulus of elasticity and excellent thermal stability by spinning and drawing a polyhexamethylene adipamide under a specific condition. CONSTITUTION:Chips having >=95mol% whole repeating units of molecular chain composed of a polyhexamethylene adipamide, having >3.0 relative viscosity in sulfuric acid, is subjected to melt spinning, blown with a cooling gas in a cooling zone and passed through a spinning column. The cooled and solidified yarn is wound by a take-up roll rotating >=1,500m/minute speed and taken off as yarn having >=20X10<-3> birefringence. The yarn is directly drawn at 1.5-7.0 times draw ratio in an electric discharge part 111 a normal-pressure atmosphere containing >=60 mol % rare gas element or made into polyhexamethylene adipamide yarn having <=40m10<-3> birefringence. The electric discharge part consists of high voltage impressed to a pair of electrodes 1 and 2 wherein the surface at least one side of the electrodes is coated with dialectic materials 3 and 4. |
