Twist and Twist Factor in Yarn Spinning, Factor affecting of twist in yarn properties.

Twist is the number of turns of a yarn around its own axis per unit length. It is an essential property of yarn, as it determines the strength, handle, and appearance of the yarn. The amount of twist in a yarn is typically expressed in turns per inch (TPI) or turns per meter (TPM).

The twist factor is a dimensionless quantity that is used to relate the twist in a yarn to its yarn count. It is calculated using the following formula:

TM = TPI√Ne

where:

• TM = twist factor
• TPI = turns per inch
• Ne = yarn count

A twist factor is a useful tool for comparing the twist levels of different yarns, regardless of their yarn count. For example, a yarn with a twist factor of 3.0 will have the same twist level as a yarn with a twist of 6 TPI if the yarn count of both yarns is 100.

The amount of twist in a yarn can be affected by a number of factors, including the type of fiber, the yarn count, the spinning method, and the desired properties of the yarn. For example, filament yarns typically require less twist than staple yarns, and yarns with a higher yarn count will require more twist.

The twist in a yarn has a number of effects on the yarn's properties. For example, twist increases the strength of the yarn, but it also makes the yarn stiffer and less pliable. The twist also affects the appearance of the yarn, as it can create a smooth or textured surface.

The amount of twist in a yarn is carefully controlled during the spinning process to achieve the desired properties for the yarn. The twist factor is a useful tool for understanding and controlling the twist level of yarns.

Here are some additional points about twist and twist factor in yarn spinning:

• The twist direction can be either S (clockwise) or Z (counterclockwise). The twist direction of a yarn can affect its properties, such as its luster and drape.
• The twist level of a yarn can be increased or decreased by re-twisting the yarn. This is a common practice in the textile industry, as it allows manufacturers to adjust the properties of the yarn to meet the specific requirements of a particular application.
• The twist factor is a useful tool for predicting the properties of a yarn. For example, a yarn with a high twist factor will be stronger and less pliable than a yarn with a low twist factor.

Conclusion

Twist is an important property of yarn that affects its strength, handle, and appearance. The twist factor is a useful tool for understanding and controlling the twist level of yarns. By carefully controlling the twist level, manufacturers can produce yarns with the desired properties for a particular application.

I hope this article was informative!