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SEBA Class 10 Weaving and Textile Design Chapter 4 Dyeing of Silk
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Dyeing of Silk
Chapter – 4
| Self-Check Questions – 4 |
1. Which type of dye is suitable for silk dyeing?
Ans: Acid dye is suitable for silk dyeing.
2. State the function of silk degumming.
Ans: The function of silk degumming is to remove the sericin gum and other impurities that form a protective layer around silk fibers.The removal of such materials is known as degumming.
3. Describe the dyeing of silk with acid dye.
Ans: Acid dyes are widely used for dyeing silk and offer a wide range of bright and vibrant shades. Silk may be dyed either in yarn form or in fabric stage. Depending upon the forms of material available different dyeing machinery is used. Some of the dyeing equipments are- Tub dyeing, Arm dyeing, Jigger/Winch dyeing etc.
4. Why pre-treatment of material is carried out before dyeing?
Ans: Pre-treatment of material is carried out before dyeing to remove impurities such as sericin gum through a process called degumming, especially in silk. This pre-treatment of material is necessary for better improvement of dye uptake. This process is same as done in the silk material preparation of acid dyeing.
5. Describe the dyeing of silk with basic dye.
Ans: First, a dye paste is prepared by mixing the required amount of dye with a small quantity of water. Then hot water is added with continuous stirring to form the desired dye solution. Alternatively, a stock dye solution may be used. The remaining water is added to get the desired material to liquor ratio.
Next, the required amount of levelling agent is added, and then glauber salt is added. After that acetic acid solution is added to maintain pH 4.5.
Now, the silk samples are immersed into the dye bath and run for 10 minutes at 40°C. Then, the temperature is raised to 80°C at a rate of 1.5°C per minute, and dyeing is continued for another 40 minutes. Finally, the dye bath is cooled down to 60°C at the same rate.
6. Write any two differences between acid and basic dyeing.
Ans: The two differences between acid and basic dyeing are:
| Acid dye | Basic dye |
| Acid dyes are typically used for protein fibers like wool and silk. | While basic dyes are often used for acrylic fibers. |
| Produces a wide range of bright shades, especially on silk, and is commonly used with equipment like tub dyeing, arm dyeing, and jigger/winch dyeing. | Known for brilliance and intensity of colour, but many basic dyes are sparingly soluble in water, though they dissolve easily in alcohol or methylated spirit. |
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