Determination of the Yarn Count by Wrap Reel and Analytical Balance

Last Updated on 23/12/2020

Determination of the Yarn Count by Wrap Reel and 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 and 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.
Motor drive wrap reel
Fig: Motor 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
Fig: 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

Yarn Count Determination 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 is calculate which is cotton count of this sample.

Precaution:

  • To maintain proper tension of yarn when yarn are wind on wrap reel.
  • Weight is taken very carefully.

Conclusion:
It is the very easy process but there need more time than another process.

You may also like: How to Determine Thread Count of Fabric by Beesley Balance

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