Yarn Twist || What is Yarn Twist?

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Yarn Twist is the measure of the spiral given to a yarn in order to hold the constituent fibres or threads together.
According to textile institute “Twist is the spiral disposition of the components of a thread which is usually the result of the relative rotation of the two ends”.
Types of Yarn Twist:
According to direction of twist, it is of two types: -
1. S- Twist
2. Z- Twist.
S- Twist: A single yarn has S twist if, when it is held in the vertical position. The fibres inclined to the axis of the yarn conform in the direction by slope to the central portion of the letter “S”.
Z-Twist: A single yarn Z Twist if, when it is held in the vertical position, the fibres inclined to the axis of the yarn conform in the direction of slope to the central portion of the letter “Z”.