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1. A parison is extruded from a die with outside diameter = 11.5 mm and inside diameter = 7.5 mm. The observed die swell is 1.25. The parison is used to blow mold a beverage container whose outside diameter = 112 mm (a standard size 2liter soda bottle). (a) What is the corresponding wall thickness of the container? (b) Obtain an empty 2liter plastic soda bottle and (carefully) cut it across the diameter. Using a micrometer, measure the wall thickness to compare with your answer in (a). Supplement to 13.23: (c) why would your measurement of the 2-liter bottle be “off” from your calculations? Be specific.
2. The bottom of a chair (where you sit, the ‘seat’) will be injection molded by itself in a mold. Assume the chair is a disk, 24 inches in diameter and 1/10 inch thick. If the injection pressure is 1600 psi, what is the minimum clamp tonnage you need for the injection molding machine? Give the answers in standard tons.
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