Name of the Experiments: Dyeing of 100% cotton fabric with natural dye.
1. Objective:
· To learn about dyeing of cotton fabric with natural dye.
· To learn about mordanting of the fabric.
2. Theory:
Nowadays natural dyes become popular due to its environmentally friendly and bio-degradable act. But still, textile scientists are busy to find out the parameters to achieve optimum colorfastness in case of natural dyeing. The common disadvantages of natural dyeing is the poor color fastness, high cost, high consumption of dyes to achieve normal shade compare to reactive dyeing.
3. Experimental Procedure:
Sample: Pre-treated 100% cotton woven fabric.
Dyes & Chemicals:
Table 6.1: List of dyes and chemicals
|
Dyes & Chemicals
|
Function
|
|
Natural dye(Turmeric )
|
To dye the fabric
|
|
Mordanting agent
|
Pre-treat the fabric to increase absorbency of dyes.
|
Equipment List:
o Beaker.
o Measuring Cylinder.
o Pipette.
o Pot.
o Digital Balance.
o Scissor.
o Tri-pod stand.
o Gas Burner.
o Thermometer.
4.Working Procedure:
Table 6.2: Recipe of Mordanting
|
SL
|
Process Parameter
|
Unit
|
Dossing
|
Stock Solution
|
|
01
|
Alum
|
g/L
|
5
|
2%
|
|
02
|
Sample Weight
|
gm
|
5
|
------
|
|
03
|
M:L
|
------
|
1:30
|
------
|
|
04
|
Temperature
|
°C
|
100
|
------
|
|
05
|
Time
|
min
|
20
|
-------
|
Calculation:
Total Liquor: Material Weight X L { M:L }
= 5gm X 30
= 150 mL
Alum : = (150 X 5)/(2% X 1000) mL
= 37.5mL
Initial Water : = Total Liquor - (chemicals)
= 150 - (37.5)mL
= 150-37.5 mL
= 112.5mL
Table 6.3: Recipe of Natural dyeing
|
SL
|
Process Parameter
|
Unit
|
Dossing
|
Stock Solution
|
|
01
|
Turmeric Powder
|
%
|
4
|
1%
|
|
02
|
Sample Weight
|
gm
|
5
|
------
|
|
03
|
M:L
|
------
|
1:30
|
------
|
|
04
|
Temperature
|
°C
|
80
|
------
|
|
05
|
Time
|
min
|
20
|
-------
|
Calculation:
Total Liquor: Material Weight X L { M:L }
= 5gm X 30
= 150 mL
Natural Dye: = (5 X 4%)/(1%) mL ( )
= 20 mL
Initial Water : = Total Liquor - (chemicals)
= 150 - (20)mL
= 150-20 mL
= 130mL
Process Flow Chart:
Collection of 100% cotton pre-treated fabric.
↓
Mordanting of the fabric by sodium alum.
↓
Dyeing of the fabric with natural dye.
↓
After treatment.
Figure 6.1: Process Flow Chart
Figure 6.2: Process curve of mordanting.
Figure 6.3: Process curve of natural dyeing
Process Description:
At first, we need to collect cotton pre-treated fabric. Then we first mordanting the fabric with sodium alum. Then we dye the fabric with natural dye here the cold rinsing done to remove excessive dye molecule from the fabric surface.
Precautions:
o Taking chemicals as per recipe provided by the Instructor.
o Taking every weight of chemicals carefully.
5. Result & Discussion:
Sample Attachment:
Discussion: Here we observed the fabric absorbed dyes very well.
6. Conclusion & Comments: By doing this experiment we have learned about the dyeing of cotton fabric with natural dye. Here we able to achieve our desired shade of color.
