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In: Mechanical Engineering

A single-screw polymer extruder can be thought of as a pump and a heating device for...

A single-screw polymer extruder can be thought of as a pump and a heating device for plastic pellets. A certain extrusion setup has the following characteristics:

• Polymer: Polyethylene with density 0.95 g/cm3, specific heat 1800 J/kgK

• Flow characteristics: polymer temperature increases from 25 C to 200 C, flow rate 10 kg/hr, extruded strand is a cylinder, 2 mm in diameter

• Heating elements: multiple electric heater bands available with 110 Volt, 2 Amp rating

• You measure a back pressure of 300 MPa and a torque of 100 N m at 100 rpm.

Using the energy and mass balances, answer the following about this extruder:

a. What is the linear velocity of the strand exiting the die?

b. What is the rate of shaft work required to run the screw?

c. How many heater bands are required to heat the polymer to the required melt temperature?

Solutions

Expert Solution

samet mamat answered 2 years ago
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