GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-III (NEW) EXAMINATION — SUMMER 2019
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Subject Code: 2132904 Date: 18/06/2019Subject Name: Textile Processing - I
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Explain the following terms: 03
i. MLR ii. Shade percentage
(b) Write in short on grey fabric inspection. 04
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(c) Write shorts notes: 07
i. Scouring of colored Woven Goods ii. Exhausting Agents
Q.2 (a) Draw process flow of textile wet processing department. 03
(b) Explain the following terms : 04
i. Concentration and exhaustion of a dyeing bath.
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ii. Cross dyeing and Topping (c) Justify the significance of J-box in scouring of cellulosic fibres and their blends 07
with the help of proper sketch and process sequence and parameters.
OR
(c) Discuss yarn dyeing machines with sketch, process parameters and the 07
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precautionary measures.Q.3 (a) What is singeing and why it is required to be carried out for some of the fabrics? 03
(b) Provide meaning of following terms: 04
i. Saponification ii. Surfactant iii. Mercerization iv. Emulsification
(c) Write short notes on 07
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i. Shearing Process il. Padding MangleOR
Q.3 (a) Give the advantages of dyeing loose cotton. 03
(b) Describe the process of dyeing Polyester fabrics by carrier dyeing. 04
(c) Define Dyeing. Classify the Coloring matter. Also write about different types of 07
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dyes used for different fibres:Q.4 (a) Explain the objectives of desizing. 03
(b) Discuss the process of rot steeping desizing. 04
(c) Describe Stepwise dyeing of Disperse dyes. 07
OR
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Q.4 (a) Give the classification of dyes along with fiber types. 03
(b) Write a note on scouring of colored woven goods. 04
(c) Discuss, with neat sketch and principle, Jigger Dyeing Machine with its positive 07
and negative aspects.
Q.5 (a) What is stripping? 03
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(b) Compare hypochlorite and peroxide bleaching. 04
(c) Discuss Hydrogen Peroxide bleaching in relation to its recipe and process 07
conditions.
OR
Q.5 (a) Give the properties of vat dyes. 03
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(b) Describe the process of dyeing nylon material. 04
(c) Explain why desizing is necessary. Enlist various desizing processes. Describe 07
the process of Acid desizing.
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