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2003 Course Polymer Processing Operation - II

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Total No. of Questions : 12] [Total No. of Pages : 3 [3664] - 302 P 1170 B.E. (Polymer) POLYMER PROCESSING OPERATION - II (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer Q1 or Q2; Q3 or Q4; Q5 or Q6 from Section-I and Q7 or Q8; Q9 or Q10 and Q11 or Q12 from Section-II. 2) Answers to the two sections should write on separate answer book. 3) Neat diagrams must be drawn wherever necessary. 4) Use of logarithmic table, slide rule and electronic pocket calculator is allowed. 5) Assume suitable data, if necessary. SECTION - I Q1) a) Discuss the trouble-shooting guide for calendering process. [6] b) Why roll crowing & roll bending is necessary in case of calender rolls used in manufacturing of PVC sheet? [4] c) Differentiate between sheet manufactured by calendering process & extrusion process. [4] d) List the material used for calendering process and explain the any two material used in calendering process with processing condition. [4] OR Q2) a) List the material used in construction of calender roll. What are material merits & demerits. [4] b) Derive the expression for maximum pressure & point of maximum pressure in case of calendering assuming steady, laminar, isothermal & incompressible fluid using Newtonian fluid. [6] c) Discuss movable and fixed roll position for different types of calender [4] roll. d) Write a short note on bearing used in calender of calendering unit. [4] Q3) a) b) Explain with neat sketch rotational molding process in detail. [8] List different types of rotational molding machine and explain rock and roll type machine in detail. [8] P.T.O.

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