Determination of the Yarn Count by Wrap Reel & Analytical Balance

Determination of the Count by Wrap Reel & Analytical Balance
Meftaul Ferdous
Lecturer, Dept. of Textile Engineering
Islami Bank Institute of Technology
Email: tex.e.ferdous@gmail.com 


Experiment Name:
Determination the yarn count of a given cotton sample by wrap reel & analytical balance.

Theory:
Yarn count: The yarn count is a numerical expression which defines its fineness or coarseness. It also expresses weather the yarn is thick or thin. A definition is given by the textile institute – “Count is a number which indicates the mass per unit length or the length per unit mass of yarn.”


                           Length in yard × Weight Unit 
Cotton Count = ........................................................................................................0 1
                           840 Yard × Weight in pound

Objectives of Experiment:
  1. To know about yarn count .
  2. To know about wrap reel & analytical balance.
  3. To know how to determine the count by wrap reel & analytical balance .
Wrap Reel:
A wrap reel or skein winder is a device for measuring yarn and making it into hanks of a standard size.. The reel is of a standard size and its revolutions are counted as the yarn is wrapped around it. Typically, a set number of revolutions will be used so that the hank is of a standard size — a skein or lea. For example, a skein of cotton would be 80 turns on a reel of 54 inches circumference, making 120 yards, while the standard length for wool worsted would be 80 yards.

The tension of the yarn as it was wound onto the reel was important because it would be elastic and so a standard tension was required to ensure uniformity. For a given reel, this would be determined by the friction of the setup and so the test hanks would be made and measured in other ways to calibrate the device.
Wrap reel are two types on the basis of driving method :
  1. Hand Drive
  2. Power Drive .

Hand Drive Wrap Reel
Figure: Hand Drive Wrap Reel
Analytical Balance: 
An analytical balance (often called a "lab balance") is a class of balance designed to measure small mass in the sub-milligram range. The measuring pan of an analytical balance (0.1 mg or better) is inside a transparent enclosure with doors so that dust does not collect and so any air currents in the room do not affect the balance's operation. This enclosure is often called a draft shield. The use of a mechanically vented balance safety enclosure, which has uniquely designed acrylic airfoils, allows a smooth turbulence-free airflow that prevents balance fluctuation and the measure of mass down to 1 μg without fluctuations or loss of product. Also, the sample must be at room temperature.

Analytical Balance
Figure: Analytical Balance
Data Collection:
Sl. No
Length (Yard)
Weight(gm)
Weight(lbs)
Gm Wt/453.6
Count
Average Count
01
120
2.00
o.0044
32.46

02
120
2.10
0.0046
31.05

03
120
2.00
0.0044
32.46
31.48
04
120
2.15
0.0047
30.40

05
120
2.10
0.0046
31.05


Calculation: 

               Length in yard × Weight Unit
Count = ..........................................................
               840 Yard × Weight in pound

      120×1
= ......................
   840×0.0044

= 32.46

By the same process another are calculate and calculate average count.

Result: 
The cotton count is 31.48

Procedure:
  1. Make lea by Wrap reel.
  2. Weight the lee by analytic balance .
  3. Convert the weight gram to pound.
  4. Now the data are put equation (1)
  5. Now calculate the count by the equation.
  6. Now average count are calculate which is cotton count of this sample.
Precaution:
  1. To maintain proper tension of yarn when yarn are wind on wrap reel.
  2. Weight are taken very carefully .
Conclusion: 
It is the very easy process but there need more time than another process.

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