Chemistry > QUESTIONS & ANSWERS > McMaster University - CHEM ENG 4X03ChE 4X3 Assignment 5 2020 soln (All)
McMaster University - CHEM ENG 4X03ChE 4X3 Assignment 5 2020 soln
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ChE 4X03/6X03 Introduction to Polymer Processing Due Tuesday April 7 1. [15 Marks] An extrusion line has been set up to prepare two planks at the same time. The line extrudes a wood composite (WC) ... resin which has a measured melt index of I2.16kg = 0.8 g/10min and I10kg = 6 g/10min at 180oC. Melt density of WC at this temperature is 1190 kg/m3. The measurement was determined under the standard conditions of ASTM D-1238 [Lc = 8.000 mm (capillary length); Dc = 2.0955 mm (capillary diameter); Dp = 9.5504 mm (plunger diameter)]. We are only concerned about the 250 mm, 15 L/D melt extruder (i.e. Db = 250mm with no solids conveying zone or melting zone) being used in the line, which has a 12mm deep constant depth square-pitched metering screw (flight thickness, e = 25 mm) rotating at 60 RPM. The die splits the flow to produce two planks of equal cross-section, 18 cm wide and 5 cm high, and is drawn in the figure below. The internal length of the die (i.e. length of the flow path in the die) is L = 75 cm. [Show More]
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