Twisted yarns are roughly classified according to the twisting direction, twisting number and twisting shape.
- Difference in twisting direction
Application in use differs according to twisting direction.
Left twist (Z twist) Often used for sewing machine threads.
Right twist (S twist) Often used for manually sewing threads.
- Difference in twisting number
Differs according to thickness and nature of threads, however, they are as follows;
- Slight twist (500t/m or less) – Medium twist (500t/m to 1000t/m) – Hard twist (1000t/m or more)
*t/m = number of rotations per 1m of yarn
- Difference in twisting shape
Single-twist One or more yarns are paralleled and twisted.
Organzine Two or more single-twisted yarns are paralleled and twisted.
Furthermore, there are various twisting shapes such as design twisted yarns.