Name of the Experiment: Determination of Cotton fiber fineness by WIRA fineness tester.

Introduction:

The fineness is a very important property of a fiber. However, the fineness of fiber cannot

be measure by general scale of measurement. The task of measurement may found by

microscope. However, this lengthy process is not suitable for industrial uses. So special index

should use for the purpose of fineness measurement. The weight of a fiber per unit length i.e.,

linear density is widely used. Again the micronair value of a fiber is also denotes the fineness of

that fibre. The micronair value defined as the weight of fibre in microgram pre unit of length in

inch.

Micronair value (MIC) =inchinLength

micrograminweight

Object:

In the WIRA fineness tester, fineness of a sample can be measure easily by taking a

definite amount of cotton sample and the MIC value directly found from the scale.

Instrument:

1. WIRA fineness meter

2. Electric Balance

Apparatus:

1. Cotton chamber.

2. Adjustment.

3. On-Off switch.

4. Flore scale.

5. Fibro MIC.

Sample:

Cotton Sample supplied by the lab authority.

Working Procedure:

- To measure a 3.25 gm sample of cotton from the sample given.

- To open the measured cotton sample by hand.

- To sink the sample in the WIRA fineness meter hole completely.

- To turn the power switches on of the meter on.

- To rise the water level up to the mark by rotating the volume key.

- Now let it go down and observed the MIC value in the scale.

Figure: Fibro MIC Fiber Fineness Testing Machine.

Data:

Experimental data which we were found in laboratory are given below;

Calculation:

Not necessary

Result:

Here in this experiment, we got the average MIC value of the cotton fiber is 4.3.

Precaution:

In this experiment, we were trying to get accurate MIC value for the cotton fiber but

some happening fault we got 98% accurate value.

For this experiment, relative humidity and room temperature is so important. Their increase and

decrease can carry the MIC value.

We are used all of our instrument and apparatus very carefully. It is very hard to free the dirt

from the cotton but we try our best and it is done very carefully because if the cotton fiber were

not free from the dirt, will not find the accurate weight which can vary the MIC value.

Remark: The WIRA fineness meter is a direct reading meter. Therefore, calculation is not required.

Again, the MIC value of this sample is average by the result of a number of student’s

experiments. Therefore, the final value of MIC is satisfactory.

Observation

no

Weight of the

cotton fiber

in gm

Fiber fineness

MIC value

Average MIC

value

1 3.24 4.6

2 3.24 4.0

3 3.24 4.4 4.3

4 3.24 4.2

5 3.24 4.3