Question

Classification of twist and twist measurement in testing

Answer 1

Answer:

Types of Twist

S-twist

Z-twist

Explanation:

Yarn Twist:

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.  

Techniques of twist Measurements

The most common techniques that have been used for measuring yam twist are listed below.

❶ Straightened fiber technique or the direct count method.

❷ Twist contraction technique or the untwist and re-twist method.

❸ Twist to break technique.

❹ Microscopic