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.
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.
