An extruder barrel has a diameter of 110 mm and a length of 3.0 m. The screw channel depth = 7.0 mm, and its pitch = 95 mm. The viscosity of the polymer melt is 105 Pa-s, and the head pressure in the barrel is 4.0 MPa. What rotational speed of the screw is required to achieve a volumetric flow rate of 90 cm3/s?

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Asked Oct 9, 2019
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An extruder barrel has a diameter of 110 mm and a length of 3.0 m. The screw channel depth = 7.0 mm, and its pitch = 95 mm. The viscosity of the polymer melt is 105 Pa-s, and the head pressure in the barrel is 4.0 MPa. What rotational speed of the screw is required to achieve a volumetric flow rate of 90 cm3/s?

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Step 1

Calculate the flight angle.

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A = tan 95mm tan Tx110mm =15.370

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Step 2

Calculate the drag flow rate.

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Q-0.52D2Nd sin A cos A 0.57 (0.110 m) (N rps)(7x10 m(sin 15.37°) (cos1 5.37°) 3 m 95.33x10N

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Step 3

Calculate the back...

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Рr Dd' sin? A О, 127L я(4x10'Ра) (0.10 m)(7~10*m) (sin15.37°)* 12(105 Ра-s) (3 m) m =6.91x 10

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