Effect of Acid Cellulase at Different Concentration and Parameters on Wet Processing of Knitted Fabric Part-3

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TESTING METHOD:

Color Fastness:-
The resistance of a material to change in any of its color characteristics, to transfer its colorant to adjacent material or both as a result of exposure of the material to any environment that might be encountered during the processing, testing , storage or use of the material. Color fastness types:
Factors affecting color fastness:
  • Dye size or molecular structure of a dye
  • Types of bonding (i.e., ionic , co-valent, H-bond etc.)
  • Amount of dye present in fibre
  • Chemical nature of fibre or compatibility of dye with fibre
  • Presence of other chemicals like binder
  • The actual condition prevailing during exposure and after treatment
Reasons of color loss:
  • Due to decomposition of dye molecules
  • Due to removal of external media
  • Due to reaction of dye molecules with acid, alkali, or perspiration
  • Due to friction with other surface
Washing fastness (ISO 105):

Recipe:

1) Anhydrous sodium carbonate = 2gm/l
2) ISO standard soap = 5gm/l
  • M:L = 1:50
  • Sample size : 10cm×4cm
  • Adjacent fabric : 5cm×4cm
  • Temperature : 60 oC
  • Time : 30 min
Assessment:

Rating
               Remark

5
Excellent
4-5
Good
4
Good
3-4
Average
3
Average
2-3
Average
2
Poor
1
Very poor

Rubbing fastness (ISO 105):


Two type 
a) Dry rubbing,
b) Wet rubbing
  • Sample size : 20cm×5cm
  • Crock fabric (WHITR) : 5cm×5cm
  • No. of rotation : 10
  • Time : 10 sec
  • Load : 9N±5% 
Crockmaster for rubbing fastness test
Crockmaster for rubbing fastness test
Assessment:

Rating 
               Remark

5
Excellent
4-5
Good
4
Good
3-4
Average
3
Average
2-3
Average
2
Poor
1
Very poor

Perspiration fastness:

Recipe: 
  1. Di sodium hydrogen orthophosphate di-hydrate NaHPO4 = 2.5 g/l
  2. L-histidine hydrochloride mono hydrate = 0.5gm/l
  3. Sodium chloride NaCl = 5g/l
  4. Time = 4hr
  5. Temp = 37°C

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