Method for yarn- dyeing microfibers

Abstract

A method for yarn-dyeing split microfibers includes winding microfibers on a plurality of cones provided with outlet openings and inserting the microfiber-wound cones into a plurality of rods provided with discharge holes arranged in a lower part in a cheese dyeing machine, to load the microfibers in the cheese dyeing machine, adding an alkali agent to the microfibers in the cheese dyeing machine to induce a reduction of weight of the microfibers, spraying high-pressure water from the inside of the hollow rods through the discharge holes into the cheese dyeing machine, in a state wherein weight-reduced microfiber yarns wound on the cones are mounted on the rods, to allow the high-pressure water to pass through the microfibers through the discharge holes provided on the cone, and cause the water to remove foreign materials.

1 . A method for yarn-dyeing split microfibers made of a composite of polyester and polyamide, the method comprising:
 winding microfibers on a plurality of cones provided with outlet openings and inserting the microfiber-wound cones into a plurality of rods provided with discharge holes arranged in a lower part in a cheese dyeing machine, to load the microfibers in the cheese dyeing machine;   adding an alkali agent to the microfibers in the cheese dyeing machine at a constant temperature of 100 to 130° C. for 30 to 60 minutes to induce a reduction of 6 to 15% in weight of the microfibers;   spraying high-pressure water of 70 to 80° C. from inside of the hollows of the rods through the discharge holes into the cheese dyeing machine, in a state wherein weight-reduced microfiber yarns wound on the cones are mounted on the rods, to allow the high-pressure water to pass through the microfibers through the discharge holes provided on the cone, and cause the water to remove foreign materials, while being discharged to the outside, and at the same time, showering the microfibers through a plurality of nozzles provided on a top cover of the cheese dyeing machine, to wash the microfibers with water;   scouring the microfibers with a scouring agent and treating the microfibers with acid to a pH of 4-5; and   adding a dispersing agent, a leveling agent, an antistatic agent and a softening agent to the microfibers at 100 to 130° C. for 30 to 60 minutes and dyeing the microfibers under a predetermined pressure.   
   
   
       2 . The method according to  claim 1 , wherein the water contains small amounts of calcium (Ca) and magnesium (Mg), and is free of iron (Fe). 
   
   
       3 . The method according to  claim 1 , wherein the cheese dyeing machine has a cylindrical shape and is provided on the top thereof with a cover and on an inner bottom thereof with the plurality of hollow rods,
 wherein an inside of the hollow of each rod is connected to a high-pressure water-supply pipe and the water-supply pipe is connected to each of nozzles provided on the cover.   
   
   
       4 . The method according to  claim 1 , wherein the microfibers are twisted to 100 to 1,000 tpm, to prevent the yarn from being untwisted during pressurization by the high-pressure water.