Polyurethane fiber and spinneret therefor and manufacturing method thereof

Abstract

A polyurethane fiber and a manufacturing method thereof are provided. The manufacturing method includes the following steps. A polyurethane material is provided. Then a melt extrusion process is carried out on the polyurethane material through a spinneret. The spinneret includes at least one spinneret orifice unit embedded in a spinneret body. Wherein, the spinneret orifice unit includes a plurality of spinneret sub-orifices, and each spinneret sub-orifice penetrates through the spinneret body. Each spinneret sub-orifice has a sub-orifice diameter ranging from 0.07 mm to 0.12 mm, and there is a sticking space between every two adjacent spinneret sub-orifices ranging from 0.01 mm to 0.05 mm. Then the polyurethane material passes through the spinneret sub-orifices and is sticked together to form the polyurethane fiber.

What is claimed is: 
     
         1 . A manufacturing method of a polyurethane fiber, comprising:
 providing a polyurethane material;   carrying out a melt extrusion process on the polyurethane material through a spinneret, the spinneret including at least one spinneret orifice unit embedded in a spinneret body, the spinneret orifice unit including a plurality of spinneret sub-orifices, each spinneret sub-orifice penetrating through the spinneret body, each spinneret sub-orifice having a sub-orifice diameter ranging from 0.07 mm to 0.12 mm, and having a sticking space between every two adjacent spinneret sub-orifices ranging from 0.01 mm to 0.05 mm; and   enabling the polyurethane material to pass through the spinneret sub-orifices and stick together to form the polyurethane fiber.   
     
     
         2 . The manufacturing method according to  claim 1 , wherein the spinneret body comprises a circular plate. 
     
     
         3 . The manufacturing method according to  claim 1 , wherein the spinneret orifice unit includes 3 to 30 spinneret sub-orifices. 
     
     
         4 . The manufacturing method according to  claim 1 , wherein the at least one spinneret orifice unit comprises a plurality of spinneret orifice units, and the number of the spinneret orifice units includes 2 to 452. 
     
     
         5 . The manufacturing method according to  claim 1 , wherein the spinneret sub-orifices have tube wall characteristics through which the polyurethane material passes through the spinneret sub-orifices at a shear rate less than or equal to 2,000 s −1 . 
     
     
         6 . The manufacturing method according to  claim 1 , wherein the spinneret sub-orifices of the spinneret orifice unit are arranged into a straight-line shape, a cross shape, a W shape, an asterisk shape or a ring shape. 
     
     
         7 . The manufacturing method according to  claim 1 , further comprises stretching the polyurethane fiber to a winding machine, which has a winding speed ranging from 1,200 m/min to 6,500 m/min. 
     
     
         8 . The manufacturing method according to  claim 1 , further comprises adding a dye material in the polyurethane material. 
     
     
         9 . A spinneret suitable for manufacturing a polyurethane fiber, comprising:
 a spinneret body having a first surface and a second surface opposite to each other; and   at least one spinneret orifice unit embedded in the spinneret body, the spinneret orifice unit including a plurality of spinneret sub-orifices, each spinneret sub-orifice penetrating through the spinneret body, two ends of each spinneret sub-orifice being connected to the first surface and the second surface respectively, each spinneret sub-orifice having a sub-orifice diameter ranging from 0.07 mm to 0.12 mm, and having a sticking space between every two adjacent spinneret sub-orifices ranging from 0.01 mm to 0.05 mm.   
     
     
         10 . The spinneret according to  claim 9 , wherein the spinneret body comprises a circular plate. 
     
     
         11 . The spinneret according to  claim 9 , wherein the spinneret orifice unit includes 3 to 30 spinneret sub-orifices. 
     
     
         12 . The spinneret according to  claim 9 , wherein the spinneret sub-orifices have tube wall characteristics through which the polyurethane material passes through the spinneret sub-orifices at a shear rate less than or equal to 2,000 s −1 . 
     
     
         13 . The spinneret according to  claim 9 , wherein the spinneret sub-orifices of the spinneret orifice unit are arranged into a straight-line shape, a cross shape, a W shape, an asterisk shape or a ring shape. 
     
     
         14 . The spinneret according to  claim 13 , wherein the at least one spinneret orifice unit comprises a plurality of spinneret orifice units, and the spinneret sub-orifices of the spinneret orifice units are arranged in same uniform arrangements, or in two or more different non-uniform arrangements. 
     
     
         15 . The spinneret according to  claim 9 , wherein the at least one spinneret orifice unit comprises a plurality of spinneret orifice units, and the number of the spinneret orifice units includes 2 to 452. 
     
     
         16 . A spinning machine, comprising the spinneret according to  claim 9 . 
     
     
         17 . A polyurethane fiber, comprising:
 a plurality of sub-fiber parts being arranged in parallel; and   a plurality of sticking parts, each sticking part being positioned between every two adjacent sub-fiber parts and connecting the two adjacent sub-fiber parts, each sub-fiber part having a sub-fiber diameter ranging from 0.07 mm to 0.12 mm, and each sticking part having a sticking width ranging from 0.01 mm to 0.05 mm.   
     
     
         18 . The polyurethane fiber according to  claim 17 , wherein the shape of each sub-fiber part comprises a strip shape. 
     
     
         19 . The polyurethane fiber according to  claim 17 , wherein the number of the sub-fiber parts includes 3 to 30. 
     
     
         20 . The polyurethane fiber according to  claim 17 , wherein the radial cross-sections of the sub-fiber parts are arranged into a straight-line shape, a cross shape, a W shape, an asterisk shape or a ring shape. 
     
     
         21 . The polyurethane fiber according to  claim 17 , further comprising a groove which is formed adjacent to the sticking part and positioned between two adjacent sub-fiber parts. 
     
     
         22 . The polyurethane fiber according to  claim 17 , wherein the polyurethane fiber has a denier number (den) of 1 den and 3.5 den. 
     
     
         23 . The polyurethane fiber according to  claim 17 , wherein the polyurethane fiber further comprises a dye material. 
     
     
         24 . A polyurethane multifilament fiber, comprised of the polyurethane fiber according to  claim 17 . 
     
     
         25 . The polyurethane multifilament fiber according to  claim 24 , wherein the polyurethane multifilament fiber has a denier number (den) between 30 den and 600 den. 
     
     
         26 . The polyurethane multifilament fiber according to  claim 24 , wherein the number of the polyurethane multifilament fibers includes 2 to 452 filaments. 
     
     
         27 . A filament fabric product, woven from the polyurethane multifilament fiber according to  claim 24 .