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LDPE is extruded through three rod dies (L/D = 5, 10, 15). Diameter of three dies is 1 mm. Temperature is 180C and screw speed

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LDPE is extruded through three rod dies (L/D = 5, 10, 15). Diameter of three dies is 1 mm. Temperature is 180C and screw speed is 20 rpm. Explain the ascending order of the die swell ratio (2 points) In order to reduce the die swell of LDPE, explain two methods related to processing conditions and properties of the polymer (2 points)

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