Effect of twist level on yarn strength
The level of twist is usually expressed in number of turns per metre (tpm). Number of turns per inch or twist per inch (tpi) is also used in the industry.…
Yarn twisting methods
Twist is the number of turns per unit length (cm, m or inch). In the manufacture of staple fibre yarns, twist is inserted into the fine strand of fibres to…
Yarn count and moisture content
Regardless of the yarn count system used, it is necessary to measure the weight and length of a yarn in order to determine its count. But most fibres, particularly natural…
Direct count system
The direct systems are based on the weight or mass per unit length of yarn. Some typical direct systems are given below, together with their definitions. Please note that while…
Yarn types and structures
Many different types of yarn can be manufactured for different end uses. The two most common types of yarn are staple spun yarn and continuous filament yarn. A staple spun…
Process Control in Ring Spinning
Process control in the ring frame section is important since it affects the properties of the final yarns directly. Long-term variation should not be normally introduced by the ring frame,…
Fiber Migration
Owing to their different characteristics, the fibers take up different positions in the body of the yarn. Grouping arises mostly during drawing. Thus, long fibers are often located in the…
The Positions of the fibers in the yarn structure
Owing to the twist, all or some of the fibers take up the required helical disposition. The number of fibers affected by the twist, and the degree of winding, are…
Yarn Structure
The characteristics of a yarn are strongly dependent upon the properties of the fibers used in the yarn, but they are equally dependent upon the structure of the yarn itself.…
Yarn Twist
Twist is produced in the yarn with the aid of spindles, rotors, rollers, and so on. Since two twist directions, left and right, are always possible, the fiber windings can…
