The weft or filling yarns are those which, during weaving are introduced between the warp yarns, across the width direction of the fabric. The warp are also known as ends and wefts as picks. The lengthwise edge of the fabric is called selvage (Self + Edge) Grain indicates a direction parallel to either the warp or filling yarn. The direction not parallel to either of these yarns is called off grain. Woven fabric will elongate most in a direction that is 45� to both sets of yarns and this direction is called Bias.

b. Unbalanced Yarns: Crepe and textured surface may be created from unbalanced yarns. 4.3 DIRECTION OF TWIST: In addition to the amount of twist in a yarn, the direction of the twist is also designated. There are two types of yarn twist S and Z.