GATE (TF) Textile 2017 Question Paper Solution | GATE/2017/TF/24

Question 24 (Textile Engineering & Fibre Science)

White specks observed in dyed cotton fabric are attributed to

(A)Poor wash fastness of dyes
(B)Non-uniform agitation of dye bath
(C)Low temperature of dyeing
(D)Presence of immature cotton fibres
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Frequently Asked Questions | FAQs

What is the importance of cotton fibre maturity?

The maturity of cotton fibers is an important factor in determining the quality of cotton and its suitability for different applications. Here are some reasons why cotton fiber maturity is important:

1.Strength and durability: Maturity is directly related to the strength and durability of cotton fibers. As cotton fibers mature, they develop thicker cell walls and stronger cellulose fibers, which can help to increase the strength and durability of the fabric made from them.

2.Fineness: Maturity can also affect the fineness of cotton fibers. Mature fibers tend to be thinner and more uniform in diameter, which can result in finer and smoother cotton fabrics.

3.Yield: Cotton fibers that are mature and well-developed tend to produce a higher yield of cotton lint, which is the raw material used for making cotton fabric.

4.Color: Mature cotton fibers tend to have a more uniform and consistent color, which can help to improve the appearance of the fabric.

5.Processing: Cotton fibers that are too immature can be difficult to process and can result in lower-quality fabrics that are prone to pilling and other defects.

In general, cotton fibers that are more mature and well-developed tend to produce higher-quality fabrics that are stronger, more durable, and more consistent in appearance. As a result, cotton breeders and textile manufacturers place a high value on fiber maturity when selecting cotton for different applications.

How do you fix reactive dye on cotton?

Reactive dyes are a popular type of dye used for coloring cotton fabrics because they chemically bond to the cotton fibers, resulting in excellent colorfastness and durability. However, if the dye has not been properly fixed to the fabric, it can lead to fading, bleeding, or even completely washing out of the fabric.
To fix reactive dye on cotton, follow these steps:

1.Rinse the fabric thoroughly with cool water to remove any excess dye that has not reacted with the fibers.

2.Prepare a fixative solution by dissolving 1 cup of salt and 1 cup of vinegar in 1 gallon of hot water.

3.Submerge the fabric in the fixative solution for 30 minutes, making sure that the fabric is completely saturated.

4.Remove the fabric from the fixative solution and rinse it thoroughly with cool water to remove any excess fixative.

5.Wash the fabric in cool water with a mild detergent. Do not use hot water or bleach, as this can damage the fabric and cause the dye to fade.

6.Rinse the fabric thoroughly with cool water to remove any detergent residue.

7.Dry the fabric as directed on the care label.

By following these steps, you can help to ensure that the reactive dye is properly fixed to the cotton fabric, resulting in vibrant and long-lasting colors.

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