Yarn Twist | Twist direction

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Yarn Twist

According to Morton, “When a strand is twisted the component fibres tend to take on a spiral formation, the geometric perfection of which depends on their original formation.”

According to Skinkle, “Twist is the measure of the spiral turns given to a yarn in order to held the constituent fibres or threads or threads together.”

According to WIRA, “Twist may be defined as the rotation about the yarn  axis of any line drawn on the yarn which was originally i.e. before twisting parallel to the yarn axis”.

According to Textile Institute, “Twist is the spiral disposition of the components of a thread which is usually the result of relative rotation of the two ends”.

Twist direction

The direction of twist is indicated the use of the letters ‘S’ and ‘Z’ in accordance with the following convention:

(a) S-twist: A single yarn has S twist when it is held in the vertical position, the fibres inclined to the axis of the yarn conform in direction of slop to the central portion of the letter S.

(b) Z-twist: The yarn has Z-twist if the fibres inclined to the axis of the yarn conform in direction of slope to the central portion of the letter Z.