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extrusion
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Figure 1: Column of clay emerging from the die of a screw extruder prior to being cut into brick shapes. die making blow extrusion of thermoplastic polymers section of a screw extruder of thermoplastic polymers
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extrusion

industrial process
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extrusion, process in which metal or other material is forced through a series of dies to create desired shapes. Many ceramics are manufactured by extrusion, because the process allows efficient, continuous production. In a commercial screw-type extruder, a screw auger continuously forces the plastic feed material through an orifice or die, resulting in simple shapes such as cylindrical rods and pipes, rectangular solid and hollow bars, and long plates. In metalworking, extrusion converts a billet of metal into a length of uniform cross-section by forcing the billet through the orifice of a die; aluminum is easily extruded.

This article was most recently revised and updated by Robert Curley.