Now You Know Bleach Wash of Woven Denims: Analysis of before and after Wash Properties (Part-4)

Bleach Wash of Woven Denims: Analysis of before and after Wash Properties (Part-4)

S.M. Bappy Rana
Dept. of Textile Engineering
Bangladesh University of Business & Technology
Cell: +8801781630519

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CHAPTER- 3
Methodology

The methodology of this project work was experimental. To perform a successful experiment, the following materials, instrument and methods were used in our project work.

3.1 Raw Materials:

1. Denim Apparels (leg panels): Leg panels are made of 100% cotton woven denim of Z twill (2/1), Construction: (75 X 45) / (10 X 9). Warp yarn is Indigo dyed and Weft yarn is White.
2. Desizing agent
3. Antistaining Agent
4. Bleaching powder
5. Soda Ash
6. Softener
7. Sodium hyposulphite

3.2 Working Places:

1. Testing laboratory in Bangladesh University of Business and Technology (BUBT).
2. Apparel Manufacturing laboratory in Bangladesh University of Business and Technology (BUBT).
3. Testing laboratory in Bangladesh University of Textiles (BUTEX).
4. Jamuna Washing Plant LTD, Plot-24,Block-k, section-2, Rupnagor I/A, Mirpur, Dhaka-1216.

3.3 Types of machineries used for washing:

1. Sample washing machine
2. Hydro-extracting machine
3. Dryer

3.3.1Sample washing machine:
Specification:

• Machine Name: Sample Washing machine
• Brand: Dongel
• Origin: Korea
• Capacity: 125 lb
• RPM: 600-2800
• Temperature: 40-100°c

Figure: Sample washing machine

3.3.2 Hydro-extracting machine
Specification of hydro-extracting machine:

• Machine Name: Hydro-extracting machine
• Brand: Dongel
• Origin: Korea
• Capacity: 125 kg Garments
• RPM: 2800(usually) – 4000
• Temperature: Room temperature
• Time: 5 minute

Figure: Hydroextractor machine

3.3.3 Dryer
Specification of dryer:

• Machine Name: Gas dryer machine
• Brand: Dongel
• Origin: Korea
• Capacity: 250-350 kg
• RPM: 250
• Temperature: 40- 100°c

Figure: Gas dryer

3.4 Types of instrument used for testing:

Testing Instrument	Used for
Horizontal Tensile Strength testing machine	Tensile Strength measurement
GSM cutter	GSM measurement
Beazley’s yarn balance	Count measurement
Counting Glass/ Magnifying Glass	EPI & PPI
Color controller machine	Color depth comparison

3.5 Washing Condition:

No. of Sample	10
M:L	1:25
Material Weight	1000 gm
Temperature	60°c
Time	10, 15, 30 minute
pH	10.5

3.6 The process of Bleach Washing:

Desizing Treatment:

1. Batch: 1 kg
2. M:L : 1:25
3. Desizing agent: 1 g/l
4. Antistaining agent: 4 g/l
5. Time : 25 minute
6. Temperature: 60°c
7. pH: 10.5
8. Drop the liquor
9. Hot wash is done at 70 °C for 5 mins, then two times rinsing is done.

Bleaching treatment:

1. Add bleaching powder: 5 g/l
2. Add soda wash: 4 g/l
3. Temperature: 50°c 5. Drop the liquor & Rinsing 2 times.
4. Time: 10- 30 minutes

• After 10 minutes 2 samples are unloaded
• After 15 minutes 3 samples are unloaded
• After 30 minutes 3 samples are unloaded

Neutral wash:

1. Add Sodium hyposulphite: 4 g/l
2. Temperature: 40°c
3. Time : 5 min
4. Drop the liquor & Rinsing 2 times.

Softening process:

1. Add silicon softener :3 g/l
2. Temperature: 40°c
3. Time : 10 minute 

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