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Cotton yarn count by Quadrant Balance


Cotton yarn count by Quadrant Balance

Theory: –

Yarn count: The count of a yarn is a numerical expression which defines its fineness. It means, by yarn count we come to learn about the thinness or thickness of a fibre or yarn.

The count of the yarn is the number of such yarns which are required to form one strand of a three – strand 3 in circumference rope.

Indirect System:-

Count is the number of ‘unit length’ per ‘unit weight’ i.e. unit length/unit weight.

English (Ne): 

The number of hanks (840 yds) per pound.

Quadrant Balance:

The quadrant balance is another type of direct reading instrument. A given length is measured out and suspended from the hook; the count is then read directly from the quadrant scale with more than one. series of values ,

Standard Deviation to coefficient of variation: –

The standard deviation is the square root of the mean of the squares of the deviations of the observations from their mean, i.e.

Apparatus: –

  1. Ruler
  2. Quadrant balance.
  3. Cotton package.
  4. Calculator

Atmospheric condition: –

  1. Wet condition: -26 ° c.
  2. Dry condition: -30° c.
  3. Difference between wet and dry bulb = 30° c-26 ° c. = 4° c
  4. So, relative humidity (RH) = 70 %

Procedure: –

First of all we have to take a suitable package i.e. cheese or cone form of the yarn from which the yarn have taken. Then the 4 yds yarn was measured with the help of the ruler. The measurement should be taken carefully because a little tension may vary the count. Then the yarn was taken off & a knot was given to it so that no yarn can removed & form a dense mass of cotton. At last the weight of the cotton yarn was hanged in the hook of the quadrant balance. Then the count was measured directly from the quadrant scale. Now repeat this procedure for five times and also repeat the process for 40 yds of yarn & take another five values.

Experimental Data: –

No of the observations Length of the sample yards Count from Knowles Balance (Ne)   (x) Average Count () Ne
04 28  





2 04 25
3 04 28.5
4 04 28.2
5 04 25
6 04 29
7 04 27
8 04 26
9 04 28.5
10 04 27.5


Serial no Count  

28   7.55 7.55 57.00
2 25  
3 28.5  
4 28.2  
5 25  
6 29 20.45
7 27  
8 26  
9 28.7  
10 27.5  


Result :

Indirect System:-

  1. English (Ne): 27.29
  2. Standard Deviation: 0.4716
  3. Coefficient of variation: 1.7284%


By this method we can easily defined the count of the yarn. The Quadrant balance in our lab is not an airtight condition so the weight of the yarn is not appropriate for the movement of the air.

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