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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. OR Q4) a) How particle size & shape affect the quality of rotational molding product and process? [6] b) Discuss the use of Kiss-off ribs for providing additional stiffness to rotational molding parts. [6] c) How vacuum can be used to remove bubble in rotational molding process? [4] Q5) a) Explain the process of flexography with neat sketch. Also state it s advantages and disadvantages. [6] b) Name the plastic material used in electroplating technique. State the principle of electroplating technique. List electroplated plastic products. [4] c) Name the process and the material by which plastic gloves are manufactured? Explain process with neat sketch to manufacture gloves.[6] OR Q6) a) Compare vacuum metallising process with electroplating. Describe [8] vacuum metallising in detail. b) Why surface treatment is necessary in case of PE film? Name different techniques of surface treatment, explain any one in detail. [8] SECTION - II Q7) a) List the plastic materials used to manufacture fiber. What properties are necessary for material to use as fiber? What are criteria to select different process of fiber manufacturing? [6] b) Name any four process parameter that affect the quality of nylon fiber and explain any two in detail. [6] c) Explain the term [4] i) Staple fiber and staple yarn. ii) Denier of fiber. OR Q8) a) Explain wet spinning techniques with neat sketch. [8] b) Discuss the trouble shooting guide for dry spinning process. [4] c) What is texturing? How it carried out? [4] [3664] - 302 -2- Q9) a) b) Explain in brief about standards used for recycling plastic waste. [8] Name different equipments used for recycling of plastic. Explain any one equipment with neat sketch. [8] OR Q10)a) Describe the SPI resin identification coding system? Why is necessary to have such system? [4] b) List different methods of separation of plastic waste. Explain separation method of PVC with neat sketch. [6] c) What are various methods of waste management and explain about land fill in brief. [6] Q11)a) Explain the process used for welding of PVC with respect to process parameter and equipment used. [8] b) List factor to be consider while selecting adhesive for particular application. Explain pressure sensitive adhesive. [6] c) Write principle and application of ultrasonic welding. [4] OR Q12)a) Discuss the snap fits used as method for assembly of plastic component. [6] b) Explain the solvent cementing method of polymer joining. c) Describe the process of high frequency dielectric welding in detail. [6] d) List the various fastening techniques in assembly of plastic product.[2] [3664] - 302 -3- [4]

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