F95EXAM2 - 3 5 Show how the total extruder output...

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POLYMER PROCESSING - FALL 1995 NAME:___________________________ EMA 4666C - EXAM II STUDENT #:____________________ Read each question carefully. State any assumptions you make to answer the question/problem. 1. Sketch the structures of the following polymers: (20 pts) a. Poly(styrene) b. Poly(propylene) c. Poly(vinyl chloride) d. Poly(butadiene) e. Poly(bisphenol A carbonate) 1
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2. Describe the main components of a single screw extruder. Give details as to the nature of the various aspects that are critical to the process of extrusion. (20pts). 3. Sketch and Detail a typical single stage screw such as the one used to extrude ABS in the polymer processing laboratory. (5pts) 2
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POLYMER PROCESSING - FALL 1995 NAME:___________________________ EMA 4666C - EXAM II STUDENT #:____________________ 4. Differentiate between the following types of fluid behavior: A. Newtonian Fluid B. Bingham Fluid C. Dilatant Fluid D. Pseudoplastic Fluid Give the governing equations and where appropriate the relative magnitude of the power law exponent. A sketch would be appropriate. (10 pts).
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Unformatted text preview: 3 5. Show how the total extruder output relationship is governed by temperature. Consider the equation for total extruder output and the governing factors. (15 pts) 4 POLYMER PROCESSING - FALL 1995 NAME:___________________________ EMA 4666C - EXAM II STUDENT #:____________________ 6. You have been assigned a production engineering problem associated with extrusion of 1 cm thick film of polyethylene. The film exhibits non uniform dimension. The part must be cooled from 200°C to 38°C (Ambient = 27.6°C). Calculate the time to cool the slab using the attached figure and information provided. (Hint: This is a modified example 4-5) (15 pts). 2200 = 1.235 x 10-3 cm 2 /sec m = k/h = 0.1 5 6 POLYMER PROCESSING - FALL 1995 NAME:___________________________ EMA 4666C - EXAM II STUDENT #:____________________ . 7. List and explain how to manipulate the main factors that determine heat transport in a polymer melting process within an extruder: (15 pts) 7...
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F95EXAM2 - 3 5 Show how the total extruder output...

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