Now You Know 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
Bangladesh University of Business & Technology
Cell: +8801781630519

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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
Observation no.	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
No. of Observation	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.

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