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2003 Course Fiber Technology (Elective)

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Total No. of Questions : 12] [Total No. of Pages : 3 [3764] - 363 P 1595 B.E. (Polymer) FIBER TECHNOLOGY (2003 Course) (Elective) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answers to Section-I and Section-II should be written on separate answer books. 2) Solve 3 questions from Section-I and 3 questions from Section-II. 3) Neat diagrams should be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Assume suitable data, if necessary. 6) Use of electronic pocket calculator is allowed. SECTION - I Q1) a) b) c) d) Briefly explain unique properties of Synthetic fibers. [5] Why polyester fabric/clothes do not need ironing while cotton fabrics/ clothes do? [2] What are the various Spinning techniques used in Fiber manufacture? With neat sketch, explain any one in detail. [6] What are the advantages and disadvantages of High Speed Spinning process? [5] OR Q2) a) b) c) d) What are the criteria for polymers to form fibers? [5] Explain in detail Classification of Fibers . [6] Compare between Wet and Dry Spinning processes. [4] Enlist 3 important coagulation and spinning variables directly related to fiber formation by Wet Spinning process. [3] Q3) a) What are the various sources of Natural fibers? Give at least one example [4] of each. Mention the advantages of Terephthalic acid (TPA) over Dimethyl terephthalate (DMT) in manufacture of polyethylene terephthalate (PET) polymer. [6] Write a short note on Side Reactions during PET Synthesis . [6] b) c) OR P.T.O. Q4) a) b) c) d) Q5) a) b) c) d) Under which categories Cotton, Viscose Rayon and Carbon fibers are classified? Justify. [3] In PET synthesis, why 2 step reaction is preferred. Give its advantages. [5] Comment about the effect of Diethylene Glycol (DEG) formation on PET polymer, and its fiber properties. [5] Give the list of raw materials used to synthesize Nylon 66 and Nylon 6 polymers used for fiber applications. [3] Why man-made fibers can neither be produced or processed through textile operations without Spin Finish? [3] Enumerate any 6 desirable properties of Spin Finish. [5] Give various techniques to produce Textured Yarns. Explain any one in detail. [5] Why is it necessary to carry out stretching or drawing of synthetic fibers? [3] OR Q6) a) b) c) d) What are the various ingredients of Spin Finish? Give one example of each. [4] What are the different methods of application of Spin Finish? Explain any one in detail. [4] Briefly explain Texturing Process Variables . [5] Synthetic fibers/filaments need texturing or crimping while in natural [3] fibers it is not necessary. Explain. SECTION - II Q7) a) b) c) Give in detail the steps involved in Staple Fiber production. [6] Explain the structural changes that take place during spinning. [6] Explain why drawing and heat setting is required for fibers, and what properties are enhanced by carrying out these two processes? [6] OR Q8) a) b) Give the steps involved in Yarn production for Natural fibers. [6] Define Staple Yarn and Filament Yarn . What is meant by Filament Denier ? If 100 denier is produced by 20 filaments and also by 60 filaments, then, find Filament Denier. Which one will be used for rugged application fiber? [6] [3764] - 363 -2- c) Give the importance of Identification of Fibers and what are the methods used for identification? [6] Q9) a) What is meant by Mass Colouration? What are the advantages and disadvantages of this process? [6] Give the difference between Dyes and Pigments . Explain the following terms (Any 5) :[10] Mordant. Direct Dyeing. Reactive Dyes. Vat Dyes. Chromophore. Acid Dye. Basic Dye. b) OR Q10)a) b) Explain all the 6 methods of Mass Colouration in detail. [8] Explain Carrier dyeing, High temperature dyeing and Thermosol dyeing. [8] Q11)a) b) Explain in detail why fibers need modification. Explain the following : Acrylan. Casein. Cuprammonium. Saran. Modacrylic. Spandex. Give methods to modify Nylon. c) [6] [6] [4] OR Q12)a) b) Give all the modifications done to Polyester fiber to improve it in all its drawbacks. [12] Explain the term Barriness . Why does it happen and how to avoid it? [4] [3764] - 363 -3-

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