Hollow, side by side type polyethylene/polypropylene conjugated fiber with high stretchability and lightweight and method for producing non-woven fabrics by use of it

Abstract

Disclosed is a hollow and side-by-side type conjugated fiber which is advantageous in terms of light weight, high bulkiness and high stretchability, comprising polyethylene with a melting point of 100-140° C., a density of 0.9500-0.9700 g/cm 3 , a molecular weight distribution index of 3.0-8.0 and a melt flow index of 10-25, and polypropylene with a melting point of 150-170° C., a density of 0.9000-0.9200 g/cm 3 , a molecular weight distribution index of 3.0-8.0 and a melt flow index of 10-25. A non-woven fabric prepared using the hollow and side-by-side type polyethylene/polypropylene conjugated fiber is also disclosed.

1 . A hollow and side-by-side type conjugated fiber comprising a primary component and a secondary component, said primary component being polyethylene with a melting point of 100-140° C., a density of 0.9500-0.9700 g/cm 3 , a molecular weight distribution index of 3.0-8.0 and a melt flow index of 10-25, and said secondary component being polypropylene with a melting point of 150-170° C., a density of 0.9000-0.9200 g/cm 3 , a molecular weight distribution index of 3.0-8.0 and a melt flow index of 10-25.  
     
     
         2 . The conjugated fiber as defined in  claim 1 , wherein a component ratio of polyethylene and polypropylene ranges from 3:7 to 7:3 based on weight.  
     
     
         3 . The conjugated fiber as defined in  claim 1 , wherein a hollow ratio of the hollow and side-by-side type polyethylene and polypropylene conjugated fiber ranges from 20 to 30%, and an interface of a polyethylene portion of the conjugated fiber and a polypropylene portion of the fiber is positioned at the center of the fiber.  
     
     
         4 . A method of preparing non-woven fabrics using the hollow and side-by-side type polyethylene/polypropylene conjugated fiber of any one of  claims 1  to  3 , comprising the steps of: 
 performing a carding process of the polyethylene/polypropylene conjugated fiber, to make a web;    passing the web through a hot air box heated to 130-140° C. at a line speed of 60-100 m/min; and    performing calendaring process of the passed web.