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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.

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