INTRODUCTION TO YARNS

Primitive people discovered that a succession of short fibres could be twisted into a continuous yarn. This was probably accomplished slowly and laboriously at first, but due to greater strength for the articles produced from continuous yarns, it led to the development of better process of twisting

and spinning. Different methods are till used in various underdeveloped parts of the world as well as by persons interested in reviving artistic handicraft. At the same time, it was necessary to invent simple methods of disentangling,

separating, and arranging the fibres according to their length, other than by just using the fingers. Thus, crude methods of carding were invented to separate the fibres

according to their length of staple. Eventually, techniques were refined. In time, long filament strands unwounded from silk cocoons, and still later, filaments formed by chemical synthesis were made into yarns. Now yarns are also made by integrating the staple and filament fibres.

Type of yarn

A textile yarn is an assembly of substantial length and relatively small cross section of fibres and or filaments with or without twist. Yarns can be classified in two major

categories as shown in Table 1.