Dyeing, Printing and Finishing — DU B.Sc. (Hons.) Home Science Previous Year Question Papers

Support your answer with illustrations wherever required. 1. (a) Briefly explain any five of the following : 5×2=10 (i) Doctor Blade (ii) Role of electrolyte in dyeing cotton with direct dyes (iii) Colour fastness to washing (u) Scouring of cotton (vi) Carriers for dyeing of polyester (vil) Role of Sodium Ilydrosulphite in Vat dyeing: (6) Give an example of each of the following : 5x1=5 (i) Reducing Bleach (iz) Thickening agent (iii) Carrier (io) Resisting Agent (v) Dye suitable for Acrylic. (i) sider arts 2. (a) Discuss the process of dyeing of cellulosics with azoic dyes. 8 (b) Briefly discuss any two methods used for fixation of printed goods. 7 3. (a) Write a short note on natural dyes. (b) Discuss the advantages and limitations of block printing. 6 4. (a) Briefly discuss the differences between the Flat and Rotary screen printing method. (b) Write a note on the bonds responsible for the fixation of dyes on textile substrates. 5. (a) Discuss in detail the discharge style of printing. (b) Discuss the process of mercerization of cotton. 6. Write short notes on the following (any three) : • • (i) Desizing of cotton (ti) After treatment methods of Direct Dyes • (iii) Advantages of Roller printing • (iv) Classification of acid dyes (0) Transfer printing.