Skin cooling fabric, polyethylene yarn therefor, and method for manufacturing polyethylene yarn

Abstract

Disclosed is a skin cooling fabric that can provide a user with a soft tactile sensation as well as a cooling feeling or a cooling sensation, a polyethylene yarn having improved weavability, and a method for manufacturing the yarn. The skin cooling fabric of the present invention includes a plurality of weft yarns, and a plurality of warp yarns, wherein each of the weft yarns and warp yarns has a tensile strength of 3.5 to 8.5 g/de, a tensile modulus of 15 to 80 g/de, elongation at break of 14 to 55%, and crystallinity of 55 to 85%.

1 . A skin cooling fabric comprising a plurality of polyethylene yarns,
 wherein each of the polyethylene yarns has a tensile strength of 3.5 to 8.5 g/de, a tensile modulus of 15 to 80 g/de, elongation at break of 14 to 55%, and crystallinity of 55 to 85%.   
     
     
         2 . The skin cooling fabric of  claim 1 , wherein
 the polyethylene yarn has a density of 0.941 to 0.965 g/cm 3 , a weight average molecular weight (Mw) of 50,000 to 99,000 g/mol, and a number average molecular weight (Mn) of 10,500 to 14,000 g/mol.   
     
     
         3 . The skin cooling fabric of  claim 2 , wherein
 the ratio of the weight average molecular weight to the number average molecular weight (Mw/Mn ratio) of the polyethylene is 5.5 to 9.   
     
     
         4 . The skin cooling fabric of  claim 1 , wherein
 the polyethylene yarn has total fineness of 75 to 450 denier, and   the polyethylene yarn includes a plurality of filaments having fineness of 1 to 5 denier.   
     
     
         5 . The skin cooling fabric of  claim 1 , wherein
 an area density of the skin cooling fabric is 150 to 800 g/m 2 , and   the thermal conductivity in the thickness direction of the skin cooling fabric at 20° C. is 0.0001 W/cm·° C. or more,   a heat transfer coefficient in the thickness direction of the skin cooling fabric at 20° C. is 0.001 W/cm 2 ·° C. or more,   a contact cold sensation (Q max ) of the skin cooling fabric at 20° C. is 0.1 W/cm 2  or more.   
     
     
         6 . The skin cooling fabric of  claim 1 , wherein
 the skin cooling fabric is a fabric including the polyethylene yarns as a weft yarn and a warp yarn.   
     
     
         7 . A polyethylene yarn for skin cooling fabric having a tensile strength of 3.5 to 8.5 g/de, a tensile modulus of 15 to 80 g/de, elongation at break of 14 to 55%, and crystallinity of 55 to 85%. 
     
     
         8 . The polyethylene yarn for skin cooling fabric of  claim 7 , wherein
 the polyethylene yarn has crystallinity of 60 to 85%.   
     
     
         9 . The polyethylene yarn for skin cooling fabric of  claim 7 , wherein
 the polyethylene yarn includes a polyethylene polymer having a density of 0.941 to 0.965 g/cm 3 , a weight average molecular weight (Mw) of 50,000 to 99,000 g/mol, and a number average molecular weight (Mn) of 10,500 to 14,000 g/mol.   
     
     
         10 . The polyethylene yarn for skin cooling fabric of  claim 9 , wherein
 a ratio of the weight average molecular weight to the number average molecular weight (Mw/Mn ratio) of the polyethylene is 5.5 to 9.   
     
     
         11 . The polyethylene yarn for skin cooling fabric of  claim 7 , wherein
 the polyethylene yarn has total fineness of 75 to 450 denier, and the polyethylene yarn includes a plurality of filaments has fineness of 1 to 5.   
     
     
         12 . A method for manufacturing a polyethylene yarn for skin cooling fabric comprising the steps of:
 melting a polyethylene polymer having a density of 0.941 to 0.965 g/cm 3 , a weight average molecular weight (Mw) of 50,000 to 99,000 g/mol, and a number average molecular weight (Mn) of 10,500 to 14,000 g/mol to prepare a spinning dope;   extruding the spinning dope through a spinneret having a plurality of spinning holes;   cooling a plurality of filaments formed when the spinning dope is discharged from the holes of the spinneret; and   drawing a multifilament comprised of the cooled filaments.   
     
     
         13 . The method for manufacturing a polyethylene yarn for skin cooling fabric of  claim 12 , wherein
 the polyethylene has a melt index (MI) of 1 to 25 g/10 min at 190° C.   
     
     
         14 . The method for manufacturing a polyethylene yarn for skin cooling fabric of  claim 12 , wherein
 a ratio of the weight average molecular weight to the number average molecular weight (Mw/Mn ratio) of the polyethylene is 5.5 to 9.   
     
     
         15 . The method for manufacturing a polyethylene yarn for skin cooling fabric of  claim 12 , wherein
 the drawing step is performed at a draw ratio of 2.5 to 8.5.