Fall_1994_EXAM_3 - 1 EMA 4666C Name Final Exam ( Total...

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Unformatted text preview: 1 EMA 4666C Name Final Exam ( Total Points = 110 ) Student ID # Read each question carefully. State any assumptions you make to answer the question/problem. 1. Sketch the structures of the following polymers: (6 pts) a. Poly(acrylonitrile-co-butadiene-co-styrene) b. Poly(dimethylsiloxane) c. Poly(vinylfluoride) 2 2. Draw the main components of an injection molding machine with mold. Assume a single reciprocating screw extruder is the supply of molten polymer. Give details as to the nature of the various aspects that are critical to the process of extrusion, i.e. list the four main stages of the process. (20pts). 3 3. Sketch and Detail a typical film tower. Describe the main components and significance in terms of the process. (15pts) 3b. Differentiate between the blow molding of PET film compared to HDPE film. Consider induced versus retained orientation, effect of structure on melt viscosity, etc. (10 pts) 4 4. Differentiate between an insulated runner versus a hot runner. Which would be preferred for molding of PVC or would a standard sprue system be preferred. Justify your answer.(10 pts) 5 5. Describe the main components of the attached diagram. (10 pts) 6 6. You have been assigned a production engineering problem associated with the sheet molding processing of the hood for the 1995 MISTANG TG. The part has a rough exterior. Explain the steps one should take to identify the problem and steps to correct it. Remember the components and stages of the sheet molding process. (10 pts) 7 7. Plot the following relationships. Use the proper units and scale the axes accordingly. (2 pts each ) a. Molding Wall Thickness versus Mold Diameter...
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This note was uploaded on 07/17/2011 for the course EMA 4666c taught by Professor Brennan during the Spring '08 term at University of Florida.

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Fall_1994_EXAM_3 - 1 EMA 4666C Name Final Exam ( Total...

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