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F95EXAM3 - Consider both materials and process attributes...

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Polymer Processing - Fall 1995 Name EMA 4666C Exam III ( Total Points = 100 ) Student ID # Read each question carefully. State any assumptions you make to answer the question/problem. 1. Define the following terms. Be concise and use illustrations where appropriate. : (14 pts) a. Sag b. Parison c. Sprue d. Pinch off e. Die swell f. Fountain Flow g. Flash 1
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2a. Draw the main components of an injection molding machine with mold. Assume a single reciprocating screw extruder is the supply of molten polymer. (15pts) 2
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2b. Give details as to the nature of the various aspects that are critical to the process, i.e. list the four main stages of the process and impact on material properties. (15pts). 3
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3a. Sketch and Detail a typical film tower. Describe the main components and significance in terms of the process. (16pts) 4
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3b. Differentiate between the blow molding of LDPE film compared to HDPE film.
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Unformatted text preview: Consider both materials and process attributes such as induced versus retained orientation, effect of structure on melt viscosity, temperature, pressure, take up speed, etc. (15 pts) 5 4. Describe the main components of the attached diagram. (10 pts) 6 5. You have been assigned a production engineering problem associated with the injection molding of a hand held cellular phone. The material is a polycarbonate finished by a metallization process to improve electromagnetic shielding. The hinge is attached to the plastic housing by a brass insert. The molded part cracks below the point of attachment for the hinge assembly. Outline and explain the steps one should take to identify the problem and steps to correct it. Remember the materials and processing elements of this problem (Question 2b) as well as design of the part. (15 pts) 7...
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