Natural Dyeing Process Of Cotton | Advantages | Disadvantages | Practical Experiment 2022

The natural dyeing process of cotton is the application of natural dyes to the fiber molecule of cotton fabric. It is the most recent technology in the sense of sustainability. It is the most popular dyeing procedure at present. Because less amount of hazardous chemicals is used here. As a result, users convert to use natural dyed products. Now a practically applied procedure is discussed below with its advantages and disadvantages.

Process flow chart of natural dyeing of cotton:

Process flow chart of natural dyeing of cotton

Natural dyeing process of cotton in details:

Load the fabric

Detergent, secquestering agent, anticreasing agent inject at 40⁰C

Raise tempwrature to 50⁰C

Caustic soda dossing=7minute

Raise temperature at 70⁰C

Inject H2O2

Raise temperature at 98⁰C

Runtime = 60min

Cooling at 78⁰C

Sample check (Absorbency and brightness)

If the sample is ok then drain

Wash clear

Raise temperature at 55⁰C

Control ph=4.5

Enzyme (Bio polishing) inject

Runtime =60min

Check sample (Haireyness)

If ok then drain

Wash clear

Levelling agent inject at 30⁰C temperature.

Runtime=5min

Salt dossing =15min

Runtime =10min

Color dossing=30min

Runtime=30min

Sample check for availability of dyes

Raise temperature at 80⁰C (Grade=1⁰C/min)

Runtime=45min

Cooling 78⁰C

Check sample

If ok then drain

Wash clear

Raise temprerature at 70⁰C

Runtime=10min

Drain and wash clear

Softener and unload

Delivery to finishing

Complete documentation of the practical natural dyeing process of cotton with a diagram

Fabric: 100% cotton fabric.

Color: Yellow

Preparation of Dyeing recipe:

REQUISITION FO DYESTUFF & CHEMICALS
Date              :00-00-00
Batch No       :1000
Shade/Color  :Yellow
Quantity        :1000Kg
L.:R.              :1:8
Total Water   :8000 Ltr
Buying House :Practical Textile
Buyer              :P T
Order No         :100
Machine No    : 
Type of fabric :100% cotton
Sro No             :

Dyeing Recipe:
 
SL#  Name of the chemicalsG/Liter%Req’d Qty. In KgIssues Qty.Remarks
Pretreatment :
1Detergent1 8.000  
2Anticreasign agent2 16.000  
3Caustic2.0 16.000  
4H2O22.5 20.000  
5Acetic Acid  8.000  Depends
6Peroxide killer0.15 1.200  
7Enzyme0.25 2.000  
Dyeing :
8Leveling agent1.00 8.000  
9 Anti creasing agent1.00 8.000  
10Yellow xx 3.030.000  
11      
12Glober Salt30.0 240.000  
After Treatment :
13Soaping agent1.0 8.000  
14Anti creasing agent1.0 8.000  
15      
16Fixing agent1.0 8.000  
17Softener1.0 8.000  

 PRACTICAL TEXTILE                                      PRACTICAL TEXTILE 

     Issued                                                                              Prepared by                                                      

NB: all the dyes and chemical dossing depends on the supplyer recomendation.

Dyeing sequence:

We cut the sample for every stage of the natural dyeing process. As a result, you can understand easily. This is the example of a reupdated factory.

natural dyeing process of cotton

After unloading the fabric we send it to the finishing department.

After that slitting> stenter> compacting occurs. Finally, we got the finished fabric.

The finished fabric picture is here

Natural dyed fabric sample

Natural dyeing is an eco-friendly dyeing process. The output product of natural dyeing is a health response. So that everyone should use this product. In natural dyeing, there is some advantage and disadvantage.

Advantages of natural dyeing process of cotton or dyes stuff:

  • Eco-friendly dyes.
  • These dyes are made from natural sources. As a result, they are sustainable because the dyed cellulosic fabric contains no hazardous man-made chemicals like Azo pigments or Azo dyestuffs.
  • The natural colors are exhaust completely. As a result, the drain water is completely clean. Also, the first rinsing bath will be completely clean. This is sustainable dyestuff because there are no residues from the binder. Here are pigments in the drained water and rinsing bath.
  • Natural dyes used in textiles contain no Azo dyes, which means the recycling of used clothes is sustainable, which means the pigments are suitable for the “cradle-to-cradle” philosophy.

Disadvantages of the natural dyeing process of cotton:

  •   The color range is limited. So that various color is not possible.
  •   The fastness properties of natural dyes are not up to the mark specially the light and color change after washing. Generally, the light fastness for light colors 1-2. For dark color 3. change of color after wash 3.
  • Shade variation is more than the normal dyeing process.
  • Discharge print is not possible.
  • Even dyeing is not possible normally.

Conclusion:

The world is going toward sustainability So natural dyeing is the better option for sustainability.

Process flow chart of natural dyeing of cotton

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