### Bleach Wash of Woven Denims: Analysis of before and after Wash Properties (Part-7)

Bleach Wash of Woven Denims: Analysis of before and after Wash Properties (Part-7)
S.M. Bappy Rana
Dept. of Textile Engineering
Cell: +8801781630519

Previous Part                                               Next Part

Chapter – 4
Results and Discussions

4.1. Tensile Strength Test:

4.1.1.The Results of Tensile Strength Test:

 Observation no. Before Wash After 10 minute wash After 15 minute wash After 30 minute wash Warp Weft Warp Weft Warp Weft Warp Weft 1. 350 lb 200 lb 320 lb 180 lb 290 lb 170 lb 200 lb 150 lb 2. 350 lb 210 lb 300 lb 180 lb 280 lb 160 lb 180 lb 150 lb

4.1.2 Graphical Comparison:

4.1.2.1 Comparison of tensile Strength in warp way:
 Figure 4.1.2.1.1: Bar charts of warp way Strength Measurement
 Figure 4.1.2.1.2: Bar charts of warp way Strength Measurement
4.1.2.2 Graphical comparison of strength loss % in warp way:
 Figure: Bar charts of strength loss % in weft way from observation no. 1
4.1.3 Comparison of Strength in Weft Way:
 Figure 4.1.3:1: Bar charts of weft way strength Measurement
 Figure 4.1.3:2: Bar charts of weft way Strength Measurement
4.1.3.1 Graphical comparison of Strength loss % in weft way:
 Figure: Bar charts of strength loss % in weft way from observation no. 1
4.1.4 Discussion:
Washing causes a huge change in strength of apparels. Strength has fluctuated randomly in different sample. In weft direction strength is lower than warp direction. More difference (warp) (350-200) ˟ 100/350= 43% in case of observation 1 in warp way. (200-150) ˟100/200 = 25 % in case of observation 1 in weft way. It was investigated from the project work that strength is reduced when duration of washing is increased when the bleach concentration and temperature remain same.

4.2. GSM Measurement:

4.2.1 The results of GSM measurement:

 No. of Observation Before Wash After 10 minute wash After 15 minute wash After 30 minute wash Value Average Value Average Value Average Value Average 1. 3.4 3.43 3.38 3.376 3.35 3.356 3.303 3.298 2. 3.5 3.37 3.36 3.29 3. 3.4 3.38 3.36 3.301

4.2.2 Graphical Comparison:
 Figure 4.2.2.1: Bar charts of GSM measurement
 Figure 4.2.2.2: Bar charts of GSM measurement
 Figure 4.2.2.3: Bar charts of GSM measurement
4.2.3 Graphical comparison of weight loss %:
 Figure: weight loss% from observation no. 1
4.2.4 Discussion:
Bleach washing increases the weight loss% of woven denim apparels. We know damage % should not be more than 30%, All of the tests are remain within the limit. More difference in observation 2, the weight loss% is (3.5-3.29)/3.5 ˟100= 6%. It has been explored that due to long time washing the weight loss % is increased.

1   2  3  4  5  6  7   8