# Textile Calculation

## Calculation the Effect of Sizing on Yarn Count

Calculation the Effect of Sizing on Yarn Count
Amit Kumar Das
Founder of "টেক্সটাইল ম্যানিয়া" Blog
Pabna Textile engineering college, Pabna, Bangladesh
Cell: 01770 456240
Email: amitptec6th@gmail.com

Sizing:
Sizing is a type of weaving preparatory operation which give the yarn maximum weaving efficiency. Generally its applied for blended and filament yarns to increase yarn elasticity, yarn strength, yarn weight, yarn smoothness, yarn frictional resistance.
Effect of Sizing on Counts:
With sizing the counts go courser owing to the yarn weight increase.

Mathematical problems and solutions:

Problem: 01
A 20s count cotton warp yarn when sized 15% goes courser to the extent. Find out the size counts ?

Solution:

20 hanks of pure yarn weight = 1 pound

But 20 hanks of sized yarn weight = 1 + (15/100) = 115/100 pound

And 20 hanks weight = 115/100 pound

Then the hank in 1 pound = (115 / 100) ÷ 20
= (20 x 100) / 115
= 17.39 counts (ANS.)

In the form of a formula

We have [ (Cp x 100 ) ÷ (100 + S %) = Cs

Where,
Cp = pure counts
Cs = size counts
S % = Size %

Problem: 02
If the extend courser rate of count is 35% applying for a pure 30s count of yarn. Then what would be the sized count value?

Solution:

According to our formula

We have [ (Cp x 100 ) ÷ (100 + S %) = Cs

Here,
Cp = 30s
Cs = ?
S % = 35%

So,

Cs = [ ( 30 x 100 ) ÷ (100 + 35 %)
= 29.895s (ANS)

There are at least four types of sizing with respective weight increase effect.

1. Pure sizing:
When sizing is done in yarn which produces unbleached fabric is called pure sizing. Size ingredients are used on the weight of yarn 7% to 10%.

2. Light sizing:
This is used for dyeing and printing. 11 to 15% sizing ingredients are used on the weight of yarn.

3. Medium sizing:
For increasement of strength and weight of the yarn 16 to 40% sizing ingredients are used on the weight of yarn.

4. Heavy sizing:

To increase weight of the yarn its application on twisted yarn and lower count of yarn. Above40% sizing ingredients are used on the weight of yarn.