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:

Natural dyeing process of cotton in details:

Load the fabric

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Detergent, secquestering agent, anticreasing agent inject at 40⁰C

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Raise tempwrature to 50⁰C

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Caustic soda dossing=7minute

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Raise temperature at 70⁰C

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Inject H₂O₂

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Raise temperature at 98⁰C

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Runtime = 60min

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Cooling at 78⁰C

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Sample check (Absorbency and brightness)

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If the sample is ok then drain

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Wash clear

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Raise temperature at 55⁰C

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Control ph=4.5

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Enzyme (Bio polishing) inject

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Runtime =60min

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Check sample (Haireyness)

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If ok then drain

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Wash clear

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Levelling agent inject at 30⁰C temperature.

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Runtime=5min

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Salt dossing =15min

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Runtime =10min

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Color dossing=30min

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Runtime=30min

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Sample check for availability of dyes

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

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Runtime=45min

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Cooling 78⁰C

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Check sample

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If ok then drain

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Wash clear

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Raise temprerature at 70⁰C

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Runtime=10min

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Drain and wash clear

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Softener and unload

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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 chemicals	G/Liter	%	Req’d Qty. In Kg	Issues Qty.	Remarks
Pretreatment :
1	Detergent	1		8.000
2	Anticreasign agent	2		16.000
3	Caustic	2.0		16.000
4	H2O2	2.5		20.000
5	Acetic Acid			8.000		Depends
6	Peroxide killer	0.15		1.200
7	Enzyme	0.25		2.000
Dyeing :
8	Leveling agent	1.00		8.000
9	Anti creasing agent	1.00		8.000
10	Yellow xx		3.0	30.000
11
12	Glober Salt	30.0		240.000
After Treatment :
13	Soaping agent	1.0		8.000
14	Anti creasing agent	1.0		8.000
15
16	Fixing agent	1.0		8.000
17	Softener	1.0		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.

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 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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