Textile Processing — DU B.Sc. (Prog.) Home Science Previous Year Question Papers

4. Support your answer with illustrations wherever required. 1 (a) Briefly explain any five of the following. (5x2=10) i. Doctor Blade ii. Role of electrolyte in dyeing cotton with direct dyes ill. Colour fastness to washing iv. Role of alkali in dyeing cellulosic with reactive dyes v. Scouring of cotton vi. Thermosoling method of dyeing of polyester vii. Vatting (b) Give an example of each of the following (5x1=5) i. Reducing Bleach ii. Thickening agent ili. Carrier iv. Resisting Agent v. Dye suitable for Acrylic 2. a) Discuss the process of dyeing of cellulosic with azoic dyes. (8) b) Briefly discuss any two methods used for fixation of printed goods. (7) 3. a) Write a short note on role of acid in dyeing with acid dyes. (6) b) Discuss the advantages and limitations of block printing. (6) c) Briefly explain what are grey scales. (3) 4. a) Briefly discuss the differences between the flat and Rotary screen- printing method. (9) b) Write a note on the bonds responsible for the fixation of dyes on textile substrates. (6) 5. a) Discuss in detail the discharge style of printing. (8) b) Discuss the process of mercerization of cotton. (7) 6. Write short notes on the following. (Any 3) (3 X 5=15) Desizing of cotton ii. After treatment methods of Direct Dyes iii. Advantages of Roller printing iv. Classification of acid dyes V. Transfer printing