Composite yarn and method of manufacturing it

Abstract

A composite yarn and a method of manufacturing it are disclosed which makes it possible to produce a fine spun twisted union yarn ( 33 ) with natural grandrelle-like patterns. In particular, a manufacturing method of a fine spun twisted union yarn ( 33 ) is disclosed where the feed rate or feeding time of one of two fiber bundles ( 321, 322 ) is varied according to a 1/f fluctuation, and the one fiber bundle is spun and twisted with the other fiber bundle, thereby the one fiber bundle appears and disappears alternately on the periphery of the spun twisted union yarn ( 33 .).

What I claim is:  
     
         1 . A composite yarn comprising two fiber bundles of short fibers which are drafted into the fine spun twisted union yarn, wherein one of the fiber bundles appears and disappears alternately on the periphery of the fine spun twisted union yarn along the length of the yarn, and the respective length of an appearing part or a disappearing part varies according to a 1/f fluctuation.  
     
     
         2 . A method of manufacturing a composite yarn in a fine spinning process in which two fiber bundles of short fibers are drafted into a fine spun twisted union yarn by using a fine spinning machine, wherein the feed rate of one fiber bundle is varied by a 1/f fluctuation, and the one fiber bundle is spun and twisted with the other fiber bundle.  
     
     
         3 . A method of manufacturing a composite yarn in a fine spinning process in which two fiber bundles of short fibers are drafted into a fine spun twisted union yarn by using a fine spinning machine, wherein the feed rate of at least one fiber bundle is divided into two stages, namely a high feed-rate stage and a low feed-rate stage, wherein the feed rate in one stage is varied by the time pitch of a 1/f fluctuation, and the one fiber bundle is spun and twisted with the other fiber bundle.