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2003 Course Polymer Processing Operations - II

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Total No. of Questions : 12] P1526 [Total No. of Pages : 3 [3764] - 360 B.E. (Polymer) 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 Q.7 or Q.8; Q.9 or Q.10; Q.11 or Q.12 from Section - II 2) Figures to the right indicate full marks. 3) Use of pocket calculator log-log paper is allowed. 4) Assume suitable data, if required. 5) Draw neat sketches wherever required. SECTION - I Q1) a) Explain how bridging at Kiss-off points can be avoided by product design in case of rotational moulding. [6] b) Explain the theory of bubble formation in rotational moulding process. Explain different theories proposed for reduction of bubble size. Discuss also various means of ensuring bubble free rotational moulding processing. [8] Explain the merits of independent arm rotational moulding machine. Give sequence of operations. [4] c) Q2) a) Explain the effect of initial viscosity and rate of rise of viscosity on process of rotational moulding of liquids. [6] b) Discuss rotomoulding of nylons using open system and closed system of nitrogen introduction in mould. [6] c) Explain the information pertaining to process control that can be gained from rotolog of internal air temperature measurement. [6] P.T.O.

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