Food Extrusion

Abstract

Extrusion may be defined as forcing a pumpable product through a small opening to shape materials in a designed fashion. The extrusion process may occur through use of a piston, a set of rollers, or screw to force the material, usually through a narrow opening, into the desired shape. A home cookie maker is a simple example of an extruder. Cookie dough is forced through a specially shaped die, or opening, by use of a piston in a cylinder to form the desired shape of cookie.