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2003 Course Polymer Processing Operations - II

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Total No. of Questions : 12] [Total No. of Pages : 3 [3864] - 390 P 1269 B.E. (Polymer Engg.) POLYMER PROCESSING OPERATIONS - II (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer Q. 1 or Q. 2, Q. 3 or Q. 4, Q. 5 or Q. 6 from Section I. Answer Q. 7 or Q. 8, Q. 9 or Q. 10, Q. 11 or Q. 12 from Section II. 2) Answers to the two sections should be written in separate books. 3) Figures to the right indicate full marks. 4) Assume suitable data, if necessary. 5) Use of pocket calculator and graph paper is allowed. SECTION - I Q1) a) b) c) Q2) a) b) c) d) Q3) a) b) c) Draw a pressure profile through calender and explain why point of maximum pressure falls prior to nip. [8] [4] Discuss different heating systems used in calendering. Draw neat sketch of embossing and liminating lines. [4] Discuss different methods of taking core of roll bending and roll deflection. [5] Discuss merits and demerits of cored rolls and drilled rolls. [5] What is meant by Friction ratio ? [3] Discuss different materials used for calendering rolls. [3] Derive an equation for time taken to heat rotational moulding mould after it enters oven. [6] Discuss with neat sketches following type of rotational moulding machines [4] i) Flexible arm rotational moulding m/c. ii) Rock & roll type. Explain how will you find out that the article is formed and is cooled properly from graph of internal air temperature Vs. time, in case of rotational moulding. [8] P.T.O. Q4) a) b) c) d) Q5) a) b) Q6) a) b) c) Discuss various materials used for construction of rotational mould. [3] Write a short note on Rotational moulding of Nylons . [5] Explain how application of pressure and vacuum can be used for removal bubbles during rotational moulding. [4] Discuss particle size and particle size distribution with reference to polyethylene rotational moulding. [6] Which techniques are used to import metallic finish to plastic products? Explain any one in detail. [8] Name the processes used for printing on plastic films. Describe any one in detail. [8] Explain the process of screen printing. [4] Explain the process of corona treatment used for polyethylene films.[6] Explain slush moulding and dip moulding. Give methods of process control. [6] SECTION - II Q7) a) b) c) d) What is meant by Filament denier ? Explain with example. [4] Explain in detail with a sketch Wet spinning technique of fiber spinning. [6] Enlist drawbacks of synthetic fibers. [4] Why stretching and drawing is required after fiber spinning stage? [4] Q8) a) b) c) Explain the manufacturing technique for Viscose Rayon fiber. [5] Why is it necessary to carry out annealing of fibers? How it is done? [5] Explain in detail solution spinning technique of fiber spinning. [8] Q9) a) b) Write in short about washing and recycling of contaminated waste. [5] Write in short about metal detection and separation in plastic recycling. [5] List different equipment used for recycling of plastics and discuss any one with neat sketch. [6] c) [3864] - 390 -2- Q10)a) b) Q11)a) b) c) Q12)a) b) c) Explain primary, secondary and tertiary methods of recycling of plastics. [10] Discuss recycling of PET. [6] Discuss any two of the following assembly techniques used for plastic parts [6] i) Press fit assembly. ii) Adhesive bonding. iii) Mechanical fastening. Explain various types of joints used for ultrasonic welding of plastics. [5] What are the product design considerations taken into account while machining of plastics. [5] Write a short note on hot gas welding . [5] Explain various considerations taken into account for injection moulding of cantilever snap joints. [6] [5] Explain laser machining of plastics. [3864] - 390 -3-

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