Dyeing Cotton Knit Goods without Bleaching (Part-3)

Scope of Dyeing Cotton Knit Goods without Bleaching Operation for Energy Saving and Cost Reduction (Part-3)
Md. Palash Hossain
Department of Textile Engineering
Dhaka University of Engineering & Technology (DUET)
Email: palashsakal@yahoo.com


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3. RESULTS AND DISCUSSIONS

3.1 Color Measurement Committee (CMC) pass/fail values:

Table 10: CMC pass/fail values for different shade %

Shade %
CMC
DE
DL
Da
Db
Comments

Red
0.5
0.63
0.21
-1.53
0.30
Pass
0.25
1.52
-2.69
1.55
1.05
Fail
0.1
2.89
-0.45
-3.06
3.64
Fail

Yellow
0.5
0.37
0.07
-0.55
-0.65
Pass
0.25
0.63
-0.91
-0.72
-1.00
Pass
0.1
0.71
-1.03
-0.39
-1.35
Pass

Blue
0.5
0.93
0.29
-0.54
1.33
Pass
0.25
1.40
-0.49
-0.84
1.79
Fail
0.1
2.35
-0.56
-0.97
2.98
Fail
 Combination 1 (R=0.50,Y=0.01,B=0.01)
0.52
0.51
-0.67
-0.74
0.46
Pass
Combination 2 (R=0.2,Y=0.2,B=0.1)
0.5
0.42
-0.74
-0.22
-0.20
Pass

 
The above result shows that dyeing without bleaching is possible upto 0.5% red, 0.5% blue and 0.1% yellow shades and also for specific combination shades (0.5%)

3.2 Images of dyed fabric:
3. 3 Results of color fastness to wash test:
a. Results for Red shade: 
Figure-5:- Comparison of color fastness to wash of peroxide and without peroxide treated fabrics for red color 0.5%
With the help of this graph, it can be concluded that both the results are about same for all fibers except wool fiber. In case of wool, the wash fastness ratings with peroxide treatment is 4, generally defined as good but without peroxide treatment the value is greater than 4 but less than 5 which represents better than good.

b. Result for Blue shade:
Figure-6:- Comparison of color fastness to wash of peroxide and without peroxide treated fabrics for blue color 0.5%
From the graph, it can be stated that both results almost same for all fibers except wool fiber. In case of wool, the wash fastness ratings without peroxide treatment is 4, generally defined as good but with peroxide treatment the value is greater than 4 but less than 5 which represent better than good.

c. Result for Yellow shade:
Figure-7: Comparison of color fastness to wash of peroxide and without peroxide treated fabrics for yellow color 0.1%
The graph shows that with bleaching and without bleaching both of the test results are same for all fibers.

d. Result for Combined shade:
Figure-8: Comparison of color fastness to wash of peroxide and without peroxide treated fabrics for combination color 0.5%
From the graph, it can be stated that both the results are almost same for all fibers except polyamide fiber. In case of polyamide, the wash fastness ratings without peroxide treatment is 4, generally defined as good but with peroxide treatment the value is greater than 4 but less than 5 which represent better than good.

3.4 Color fastness to rubbing:
a. Result for Red shade:
Figure-9: Comparison of color fastness to rubbing of peroxide and without peroxide treated fabrics for red color 0.5%
The above graph is shows that dry rubbing fastness test ratings are same for both process but wet rating fastness test ratings are fair to good for without peroxide treatment whereas with peroxide process test rating is good.

b. Result for Blue shade:
Figure-10: Comparison of color fastness to rubbing of peroxide and without peroxide treated fabrics for blue color 0.5%
The above graph shows that dry and wet rubbing fastness test ratings are same for both treated fabrics.

c. Result for Yellow shade:
Figure-11: Comparison of color fastness to rubbing of peroxide and without peroxide treated fabrics for yellow color 0.1%
From the graph, it can be stated that dry and wet rubbing fastness test ratings are same for both the treated fabrics.

d. Result for Combined shade:
Figure-12: Comparison of color fastness to rubbing of peroxide and without peroxide treated fabrics for combination color 0.5%
The above graph shows that dry and wet rubbing fastness test ratings are same for both the treated fabrics.

3.5 Color fastness to perspiration:
a. Result for Red shade:
Figure-13: Comparison of color fastness to perspiration results of peroxide and without peroxide treated fabrics for red color 0.5%
From the graph it can be stated that with bleaching and without bleaching both the perspiration test result is fair for cotton and good for acetate, polyamide, polyester, acrylic and wool.

b. Result for Blue shade:
Figure-14: Comparison of color fastness to perspiration of peroxide and without peroxide treated fabrics for blue color 0.5%
From the graph it can be stated that with bleaching and without bleaching both the perspiration test result is good for all fibers.

c. Result for Yellow shade:
Figure-15: Comparison of color fastness to perspiration of peroxide and without peroxide treated fabrics for yellow color 0.1%
From the graph it can be stated that with bleaching and without bleaching both the perspiration test result is good for all fiber.

d. Result of Combined shade:
Figure-16: Comparison of color fastness to perspiration of peroxide and without peroxide treated fabrics for combination color 0.5%
Above figure shows that with bleaching and without bleaching both perspiration test results are fair for cotton and good for acetate, polyamide, polyester, acrylic and wool.

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