TWIST IN YARN

DESCRIPTION Of TWISI IN YARN;-

Twist is simply the spiral arrangement of fiber around the yarn axis . Through twisting the fibers are bound together and creates a stronger yarn . The number of twists involve is normally referred to as turns per minute.

The amount of twist added to yarn defines its strength is sought through careful calculation. Twist also effects the look of the yarn , changing its appearance to be duller or brighter. Many industries requires twist in their material for specific applications and purpose. Knowing this service , threads buys raw materials in flat form and applies varying levels of twist depending upon what on customers need.

We can twist almost any type of fibers , polyester , nylon,  cotton and more. Twist also involves rope , braids, hoses cords and other application. 

Ref:-https://www.servicethread.com twist

There are two types of twist is given to the yarn to fixed the fiber and filaments, 

(a)  'S' twist and 

(b) 'Z' twist.

(a) "S" TWIST :-  The rotation ( twist) given to the yarn in such way that it's appearance of spiral in direction to the central portion of the letter S is called "S" twist. This twist is normally given to all single yarn 

(b) "Z" TWIST:- The rotation (twist) given to yarn in such a manner that it's appearance of spiral in the central portion of the letter 'Z' is called "Z" twist . This type of twist is generally given to double or three ply yarn.

image of S & Z twist in yarn. Ref by yarn substitution.

The function of this twist is to bind all the fiber and filaments to give strength and gives dull and bright appearance in fabric.