Color Fastness Due to Wash

Theory

Color fastness to wash is the resistance of a material to change in any of its coloring characteristics as a result of washing with detergent. It is very important for fabric and ready-made garments.

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Objectives

  • To know about the color fastness to wash.
  • To know about the procedure of determining color fastness to wash.
  • To know about the importance of color fastness to washing.
Color Fastness Due to Wash


Apparatus

  1. Scissor
  2. Sewing machine or stapler
  3. Weight balancer
  4. Steel balls
  5. Greyscale etc.

Recipe

Chemicals / ParametersRequired Amount
Sodium Perborate1 g/L
ECE Detergent4 g/L
Multifiber Fabric(10 CM ✕ 4 CM)
Sample Fabric(10 CM ✕ 4 CM)
M:L1:20
Temperature80℃
Time30 minutes
Steel Balls15-20

Calculation

M:L = 1:20

Sample weight = 1.30 gm

So, liquor = (1.30 ✕ 20) = 26 ml

ECE detergent = (4 ✕ 26) / 1000 = 0.026 ml

Sodium perborate = (1 ✕ 26) / 1000 = 0.104 ml

Fresh water needed = {26 - (0.026 + 0.104)} = 25.87 ml

Working Procedure

  1. Collected dyed sample fabric and multifiber fabric as required size and weight, pin-up them, or stitch them together.
  2. Taken chemicals and freshwater as per calculation in dyeing tube.
  3. Immersed the sample with multifiber fabric in a dye tube and set the temperature at 60 for 30 minutes.
  4. After 30 minutes, compared the sample change and stain with greyscale and determine the color fastness to wash with grading.

Processing Curve

Color Fastness Due to Wash Curve
Color Fastness Due to Wash Curve

©Textile Pad


Assessment

Greyscale no 1: Change in shade

Greyscale no 2: Staining

Grey Scales
Grey Scales

©Textile Pad


Precautions

  1. Recipe calculations should be done carefully.
  2. Weighting and taking chemicals should be done carefully.
  3. The amount of water and sample taking should be done accurately.

Conclusion

Colorfastness to wash is very influential for dyed fabric. Using detergent may degrade the coloring quality of fabric if the color fastness is very poor. So, colorfastness to washing quality must be minimum good for a dyed fabric, this will increase the quality of dyed fabric.

How to determine the color fastness due to rubbing?

Bijoy

Studied In Textile Engineering. Likes writing and reading articles on the internet. Likes to take on new challenges and is interested in learning new machinery items.facebooklinkedin

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