JP-2022509330-A5 -

Dates

Publication Date

20221205

Application Date

20190827

Description

Step C: The raw silk obtained in Step B is equilibrated for 20 hours and then molded . For molding , either tension heat set or loose molding is used. In the case of tension heat set , a first traction roller, a second traction roller, a third traction roller, and a fourth traction roller are used to perform stretch molding . In the present invention, a preferred method involves a loose heat set with a temperature of 80-120°C and a duration of 2-6 minutes. Step C: The raw silk obtained in Step B is equilibrated for 20 hours and then molded . A tension heat set is used for molding , and the tension heat set employs a first traction roller, a second traction roller, a third traction roller, and a fourth traction roller to perform stretch molding . The speed of the first traction roller is 250 m/min and the temperature is 160°C; the speed of the second traction roller is 250 m/min and the temperature is 175°C; the speed of the third traction roller is 250 m/min and the temperature is 175°C; and the speed of the fourth traction roller is 250 m/min and the temperature is 180°C. In this example, multiple first, second, third, and fourth traction rollers are used. As the temperature of each traction roller rises sequentially, the temperature of the fibers is heated more uniformly, and the molded structure of the fibers is better and more stable. Step C: The fibers obtained in Step B are formed . Loose forming is used, with a temperature of 100°C and a time of 4 minutes. During the forming process, the internal stress of the fibers is released, and the polymer arrangement does not reach its most stable state, resulting in a stable compressed fiber structure. Loose forming utilizes a tension-free state to completely relax the fibers, eliminating internal stress and making the fiber structure complete and stable. Step C: The raw silk obtained in Step B is equilibrated for 20 hours and then molded . A tension heat set is used for molding . The tension heat set employs a first traction roller, a second traction roller, a third traction roller, and a fourth traction roller. Stretch molding is performed with the first traction roller at a speed of 250 m/min and a temperature of 160°C; the second traction roller at a speed of 250 m/min and a temperature of 175°C; the third traction roller at a speed of 250 m/min and a temperature of 175°C; and the fourth traction roller at a speed of 250 m/min and a temperature of 180°C . In the present invention, a preferred method is to use a low-viscosity PET with a viscosity of 0.4 to 0.7 dL/g, a high-viscosity PET with a viscosity of 0.7 to 0.9 dL/g, a PTT with a viscosity of 0.4 to 1.3 dL/g, a PBT with a viscosity of 0.7 to 1.3 dL/g, and a crimp count of the fiber body of 5 to 15 per cm. Step B: Low-viscosity PET, high-viscosity PET, PTT, and PBT are each placed in a screw extruder and melted and extruded, then weighed via a metering pump and sent to a composite spinning assembly. The weight percentage of low-viscosity PET accounts for 10-90% of the total material, the weight percentage of high-viscosity PET accounts for 10-90% of the total material, the weight percentage of PTT accounts for 10-80% of the total material, and the weight percentage of PBT accounts for 10-80% of the total material. The molten material from the composite spinning assembly is introduced into a spinneret and ejected, forming a vacuum tow in a aligned shape, and then, after spinning, ring blowing, cooling, lubrication, winding, and barrel dropping, uncrimped top fiber raw silk is produced;