Spinning

Spinning is an important topic in the textile science. It is the first step of textile product processing. The process of making yarns from the textile fibre is called spinning. Spinning is the twisting together of drawn out strands of fibres to form yarn, though it is colloquially used to describe the process of drawing out, inserting the twist, and winding into bobbins. 

Yarns can be spun both by hand spinning or mechanical spinning methods. There are different types of spinning, the most common forms being: Ring spinning, Air-jet spinning, Friction Spinning etc. 

The quality parameters for a yarn include:

• Yarn appearance - nep, slubs, thin yarn, thick yarn, fuzzy surface, yarn evenness etc
• Yarn evenness or unevenness - variation in the linear density of a strand or a portion of the strand.
• Linear density - expression of the fineness of the yarn. Expressed in terms of mass per unit length or length per unit mass.
• Single thread strength testing - force required to break a single strand of yarn of unit length.
• Twist testing - determination of the direction of yarn twist and the twists per inch (TPI), identifying whether the yarn has a balanced or unbalanced twist.