Twist Direction and Twist Level of Yarn

Indexes of Twisting Properties

Twist Count, Twist Multiplier and Twist Direction Indicating the Degree of Twist

Twist Count: One full angular rotation of the twisted yarn is defined as one twist. The number of twists per unit length of yarn is referred to as the twist count.

China adopts the tex system twist for cotton-type yarns, which is expressed as the number of twists per 10 centimeters of yarn length.
Combed wool yarns and chemical filament yarns adopt the metric count system twist, defined as the number of twists per meter.
In addition, there is also the English count system twist, indicated by the number of twists per inch.

Twist multiplier: Twist count cannot be used to compare the twisting degree of yarns with different fineness. Under the same twist count, the fiber inclination angle of a thick yarn strand is greater than that of a fine one.

In actual production, the twist multiplier is commonly used to indicate the twisting degree of yarn. As a relative value that combines linear density to express yarn twist level, the twist multiplier enables comparison of the twisting degree of yarns with different fineness. It can be calculated based on the yarn twist count and linear density.

Twist Direction: Twist direction refers to the inclined orientation of fibers in single yarns or single strands in folded yarns after twisting. It is classified into two types: Z-twist and S-twist.

After twisting, if the inclination of the yarn runs from the lower right to the upper left and aligns with the middle curve of the letter S, it is defined as S-twist;

If the yarn slants from the lower left to the upper right and matches the middle shape of the letter Z, it is defined as Z-twist.

Generally, single yarns usually adopt Z-twist, while folded yarns commonly use S-twist.