A manufacturing technique for the production of long pieces of material with a common cross-section. The material is forced through a shaped hole, the die, so that it emerges as a continuous length. Extrusion is important in the manufacture of components from metals, ceramics, and plastics. Other metals such as copper and brass are extruded hot to form water pipes and pipe fittings.
Thermoplastics become viscous on heating and can be extruded in many forms.
Oxford Paperback Encyclopedia 2. A Dictionary of Earth Sciences 5. All rights reserved.