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Unformatted text preview: Material Properties (LDPE): T m =125°C ρ=915 kg/m 3 s=2.5 (viscosity power law index) 26. A PE film is blown to a thickness of 100 µm from a 40 mm diameter annular die with a 1 mm thick slit. Calculate the required take-up speed (v f ) for an extruder mass throughput of 100 kg/hr and draw ratio, DR, of 5. The freezing point is 200 mm above the die exit; the polymer is assumed to be Newtonian with a viscosity of 1000 Pa-s; and the density is 920 kg/m 3 . The die swell ratio is approximately 2....
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- Spring '08
- Shear Stress, Fundamental physics concepts, Non-Newtonian fluid