Technological change of yarn due to sizing


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.

Textile Sizing


Sizing

Sizing or size is any one of numerous substances is i.e. applied to textiles. To act as a protective filler or glaze. It is essential to warp yarn where the strength of warp is low or hairness of yarn is high The sizing reduces the breakage of yam and thus production stops on weaving machine reduces. The amount of size material added on the yarn surface is called size take-up percentage


FUNCTIONS OF SIZE INGREDIENTS


 Adhesive:
(a) To improve strength
(b) To increase smoothness
(c) To increase elasticity and stiffness.
(d) Reduce extension percentage
(c) Impart adhesion

2. Lubricant or softener:
(a) To make the yarn soft and slippery
(b) To smoothen the yarn
(c) To reduce stiffness
(d) Reduce flexibility and friction

3. Antiseptic or anti-mildew agent;
(a) To prevent mildew formation
(b) To preserve size material for a long time
(c) To help to store the sized yarn

sizing

(d) To protect yarn from bacteria or fungus.


SIZED YARN PROPERTIES


Due to sizing there is a change in different properties of yarn as
1. Elasticity of yarn : Higher
2. Yarn Strength Higher
3. Frictional Resistance Increase
4. Hairiness Lower
5. Flexibility: Lower
6. Smoothness Higher
7. Absorbency Lower
8. Weakness Lower
9. Yarn diameter Higher
10. Wt. of the yarn Higher
11. Static Electricity Lower
12. Count of yarn: Coarse