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Extruders
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Emertaat Trading & Engineering Equipment Co (EGTE)
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Extruders
An extruder is basically a screw pump:
the screw(s) rotates in a tightly fitting stationary barrel. The semi-moist feed or dry powder/grit is introduced into the extruder, usually at a constant rate of mass or volume employing a feeding mechanism. The material thus moves forward by the rotation of the flighted screw(s). Heat is usually supplied externally to the extruder barrel, and is partly produced by viscous dissipation of mechanical energy. The control of temperature is required at different sections of the extruder and at the die end. The material thus undergoes several unit operations like mixing, compression, shearing, and cooking inside the extruder, and is finally shaped in the die through which the material is forced to exit under pressure.

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