Method for manufacturing elastic fiber and elastic fiber

Abstract

A method for manufacturing an elastic fiber and the elastic fiber are provided. The method includes: providing a thermoplastic polyester elastomer; drying the thermoplastic polyester elastomer; melting the thermoplastic polyester elastomer by an extruder to form a melt; extruding the melt by a spinneret plate to form a plurality of filamentous streams; feeding the filamentous streams into a spinning channel for cooling and curing to form a plurality of monofilaments; and bundling and oiling the monofilaments by an oil wheel, after extending and guiding the monofilaments by a first godet roller and a second godet roller, and winding the monofilaments by a winder to obtain a thermoplastic polyester elastic fiber.

What is claimed is: 
     
         1 . A method for manufacturing an elastic fiber, comprising:
 providing a thermoplastic polyester elastomer;   drying the thermoplastic polyester elastomer;   melting the thermoplastic polyester elastomer by an extruder to form a melt;   extruding the melt by a spinneret plate to form a plurality of filamentous streams;   feeding the filamentous streams into a spinning channel for cooling and curing to form a plurality of monofilaments; and   bundling and oiling the monofilaments by an oil wheel, after extending and guiding the monofilaments by a first godet roller and a second godet roller, and winding the monofilaments by a winder to obtain a thermoplastic polyester elastic fiber.   
     
     
         2 . The method of  claim 1 , wherein the thermoplastic polyester elastomer contains a linear block copolymer of polybutylene terephthalate and polyester or polyether. 
     
     
         3 . The method of  claim 1 , wherein a Shore hardness of the thermoplastic polyester elastomer is 20 D to 60 D. 
     
     
         4 . The method of  claim 1 , wherein a temperature of the extruder is 200° ° C. to 230° C., and a speed of the winder is 600 to 1,500 M/min. 
     
     
         5 . The method of  claim 1 , wherein a temperature of the first godet roller is 30 to 50° C., a speed of the first godet roller is 600 to 1,500 M/min, a temperature of the second godet roller is 30 to 50° C., and a speed of the second godet roller is 600 to 1,500 M/min. 
     
     
         6 . An elastic fiber, which is manufactured by the method according to  claim 1  and includes a multifilament structure. 
     
     
         7 . The elastic fiber of  claim 6 , wherein a cross section of the multifilament structure is in a shape formed by stacking a plurality of perfect circles or non-perfect circles. 
     
     
         8 . The elastic fiber of  claim 6 , wherein the multifilament structure includes 6 to 48 monofilaments. 
     
     
         9 . The elastic fiber of  claim 6 , wherein the elastic fiber has a denier of 40 D to 500 D, a breaking strength of 0.8 to 1.5 g/D, an elongation at break of 360% to 900%, a permanent deformation value under 100% fixed elongation of 3 to 10 mm, and a permanent deformation value under 200% fixed elongation of 10 to 40 mm.