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Twist is the spiral arrangement of the fibres around the axis of the yarn. The twist binds the fibres together and also contributes to the strength of the yarn. The amount of twist inserted in a yarn defines the appearance and the strength of the yarn. The number of twists is referred to as turns per inch.

There are different definitions given to twist of the yarn. Some of the definitions given are as follows:

Yarn twist is defined as the spiral deposition of the components of a twist is the measure of the spiral turns given to a yarn in order to hold the constituent fibres or threads together – Skinkle.

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 – Morton.

Twist may be defined as the rotation about the yarn axis of any line drawn on the yarn which was originally, before twisting parallel to the yarn axis – Wool Res. Vol. 3.

Twist may also be defined as thread which is usually the result of ...

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