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2003 Course Polymer Processing Operations - I

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Total No. of Questions : 12] P1318 [Total No. of Pages : 3 [3664]-294 B.E. (Polymer) POLYMER PROCESSING OPERATIONS - I (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates : 1) Answers to the two sections should be written in separate books. 2) Neat diagrams must be drawn wherever necessary. 3) Figures to the right indicate full marks. 4) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 5) Assume suitable data, if necessary. SECTION - I Q1) a) b) c) Q2) a) b) c) Q3) a) b) Explain gear pump or melt pump assisted extrusion process. Discuss volumetric efficiency power requirement and pulsation. [8] With neat sketch, discuss twin belt coerugator unit to make coerugated plastic sheet. [3] With schematic sketch, explain different elements in a wire or strand covering line. [5] OR Draw a neat sketch of tubing extrusion line using vacuum sizing and explain in short? [6] With a neat sketch, explain caterpillar haul off system for extruded profiles. [6] What are the different calibration systems used for pipes. Explain any one with a neat sketch. [4] Write in short about draw ratio and secondary draw. Write short notes on (any four): i) Free blowing. ii) Line binding and forming in oven. iii) Reverse draw forming with plug assist. iv) Twin sheet forming. v) Diaphragm forming. [2] [16] P.T.O. OR Q4) a) Draw a neat cycle time bar chart for cut sheet plug assist vacuum forming. Explain each step of operation in short. [7] b) Discuss different types of molds used in thermoforming from design and material for mold construction angle. [7] c) Discuss different types of heating modes for thin sheet and thick sheet forming. [4] Q5) a) Draw a neat sketch of any one type of parison die head assembly and explain the function of each part. [8] b) Draw a cycle time bar chart for continuous extrusion blow molding for single station and single parison machine. Explain in short different operations involved. [8] OR Q6) a) Explain the need and benefits of parison programming. [4] b) Draw and explain with a neat sketch convergent and divergent type of die-mandrel or cup and pin assembly. [4] c) A parison is 0.5m long and is left hanging during parison formation for 3 seconds. The density of the material is 750 kg/m3. Obtain an expression for estimating amount of sagging assuming parison formation time less than the relaxation time for the material. Assume characteristic time for the material to be 10 seconds; elastic modulus 2 x 104 N/m2. Find the amount of sagging. [8] SECTION - II Q7) a) With a neat sketches of the various steps involved, explain gas assisted injection molding. [8] b) Explain the breathing techniques used in thermoset injection molding. Draw bar chart for any one type of breathing technique. Explain the process in detail. [8] OR Q8) a) Discuss shear controlled orientation in injection molding. Draw neat sketches of arrangement of devices. [6] b) Write in short about structural foam injection molding. c) Explain with neat sketches the torpedo designs and sequences used in double colour injection molding. [5] [3664] - 294 2 [5] Q9) a) Define compression molding process. State and explain different stages of compression molding with neat sketch. [8] b) List the different types of compression molds. Explain the selection criteria for different types of molds for a given product. Explain semi positive mold with a neat sketch. [8] OR Q10)a) Write short notes on: i) Cooling jigs and fixtures used for compression molded components. ii) Deflashing unit. [8] b) Explain in brief design consideration in compression mold design. [8] Q11)a) Explain different types of transfer molding processes. Explain any one method with a neat sketch. [8] b) Explain the various faults and their remedies for the transfer molding process. [6] c) Discuss in brief transfer molding of dough molding compounds. [4] OR Q12)a) Derive an expression for power dissipated per unit volume of dielectric for high frequency preheating used in transfer molding. [8] b) List different types of transfer molding machines. Explain any one with neat sketch. [6] c) Compare transfer molding with compression molding. Y [3664] - 294 3 [4]

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