Processing a hot thermoplastic material through an opening or orifice to produce a thin, continuous sheet of film, such as those used as substrates in gravure and flexography.

In computer graphics, extrusion refers to rendering of a three-dimensional (3D) object from a Two-Dimensional one by essentially grabbing a line and stretching it out along a new third axis, accomplished in the same manner as a square is turned into a cube.

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