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
Sample washing machine
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
Hydroextractor machine
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
Gas dryer
Figure: Gas dryer
3.4 Types of instrument used for testing:

Testing Instrument
Used for
Horizontal Tensile Strength testing machine
Tensile Strength measurement
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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