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2003 Course Polymer Processing Operations - I

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Total No. of Questions : 12] P1267 [Total No. of Pages :3 [3864] - 382 B.E. (Polymer) POLYMER PROCESSING OPERATIONS - I (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) 2) 3) 4) 5) 6) Answer three questions from Section- I and three questions from Section - II.. Answers to the two sections should be written in separate answer books. Neat diagrams must be drawn wherever necessary. Figures to the right indicate full marks. Use of logarithmic table, slide rule, Mollier chart, electronic pocket calculator and steam table is allowed. Assume suitable data, if necessary. SECTION - I Q1) a) b) c) Q2) a) b) c) d) Q3) a) b) c) Explain method of calibration of outside diameter of pipe. [4] With neat sketch, explain manufacturing of twisted rod by using. [7] i) Twisting bushing. ii) Crossing belts on puller. With neat sketch, explain tentering frame & even arrangement used to produce biaxially oriented film or sheet. [7] OR Enlist different downstream equipments used in the production of pipes & tubes. Discuss each in short. [5] Draw neat sketch of processing line used to orient stripper sheet by rolling. [5] Explain the effect of orientation on properties of material. Explain effect of ultra orientation or highly oriented extruded material on optical properties. [5] Explain merits of gear pump / melt pump in case of extrusion. [3] Discuss the effect of molecular structure on melt rheology with reference to blow molding. [5] Explain how transparency is achieved in PET injection stretch blow molding. [5] Draw cycle time chart & explain accumulator base or continuous extrusion blow molding process. [6] P.T.O. OR Q4) a) Explain why water cooled blow pin helps in improving productivity. [2] b) Bringout difference between convergent & divergent die & mandrel. [4] c) Give benefit of parison programming. d) Draw neat sketch of any one parison die head assembly & explain rheological significances of individual part. [7] Q5) a) Write in short about prototype molding & production mold with reference to thermoforming. [4] [3] b) Explain use and significances of plug used in thermoforming. c) List the mathematical model used to analyze stretching behaviour of sheet [4] during thermoforming. Write in short about texturing with reference to thermoforming. [4] d) [4] OR Q6) a) b) c) Explain following process with neat sketch (Any Two). [6] i) Dripforming. ii) Slipforming. iii) Plug assist vacuum forming. Explain difference in processing by thermoforming of crystalline & amorphous material. [5] Give complete sequence of operation in the form of cycle time chart with reference to thermoforming. [5] SECTION - II Q7) a) b) Discuss any two processing problem encounter in processing of thermoset injection molding & suggest remedies for the same. [5] Discuss following processing parameter in thermoset injection molding & compare it with thermoplastic injection molding. [5] i) ii) c) Injection rate. Screw speed & barrel temperature. With neat sketch discuss different design & sequence of injection torpedo used in pattern making machine. Discuss how pattern is generated. [8] OR [3864] - 382 -2- Q8) a) b) c) Q9) a) b) c) Explain the principle & different methology of injection molding over fabric, textile as used in automobile industries. [8] Write in short about Reaction injection molding. [5] Discuss principle of flow injection molding. [5] Define compression molding? Explain the compression molding process & various stages of compression molding using cycle time diagram. [6] Discuss the trouble shooting guide for compression molding process.[8] List the different types of compression mold. [2] OR Q10)a) b) c) Q11)a) b) c) Q12)a) b) c) Explain in brief the various materials used in compression molding & processing parameters of different material used in compression molding. [6] Discuss the factors to be considered while designing compression mold used in case of thermoset material. [6] Explain in brief Intra - red heater used in compression molding with neat sketch. [4] What are different types of molds used in transfer molding? Explain any one mold with neatsketch. [6] Discuss in brief processing of sheet molding compound using transfer molding. [6] Differentiate between integral pot type and plunger type transfer molding process. [4] OR Explain the transfer molding process with reference to pressure temperature diagram. [6] Discuss the effect of following processing parameter on quality of transfer molding ( Any Four). [8] i) Amount of charge . ii) Molding pressure. iii) Clamping speed. iv) Mold temperature. v) Charge temperature. vi) Cycle time. List any four product manufactured by transfer molding process. [2] [3864] - 382 ***** -3-

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