Yarn Twist | Twist direction
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.
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