Technological change of yarn due to sizing

1. Increase in breaking strength

During sizing, adhesive material creates bonds between fibres to fibre which increase the str 7. of yarn .It increases 20 to 40 % breaking strength of the fibre .

2. Increase abrasion resistance:

 After sizing the gap between fibres are filled with size and coating on the outer surface of the yarn takes place.

3. Increase in stiffness

After sizing, flexibility or pliability of yarn is decrease and stiffness is increased.

yarn size


4. Increase in elasticity

As extensibility of the sized yarn decreases, more force has to be applied to extent the yarn. Hence elasticity increases.

5. Increase frictional resistances:

Application of size materials makes outer surface of the yarn smooth and hence occurs less friction

6. Increase yarn diameter

Sizing means coating adhesive on their outer surface of the yarn. Hence, sizing causes 3.6

7. Decrease in extension:

 After sizing, the gaps between the fibres are filled with the size materials. So, the slippage between the fibres does not occur easily. So, the extension decreased.


8. Decrease in electrostatic charge:


Electrostatic charge is formed due to the friction between yarns and roller.Size material contain moisture which reduces static friction.

9. Sub press hairiness:

During sizing protruding hairs of yarn fix with yarn and so yarn hairiness sub pressed.





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