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The Extrusion process of a thermoplastic consists in forcing the continuous passage of the material through the extruder. This passage follows to the end of the set, where it finds the matrix that gives the final format of the desired product.

Although the extruder has multiple functions for the polymers, the main reason it governs is that it works like a bomb, mechanically speaking. This equipment normally should be able to provide uniform pressure in the material to promote an equally uniform and constant flow of the polymer until it reaches the exit of the matrix. The extruder cylinder / thread assembly has special inner waistband finish to withstand internal stresses and processing conditions.

Briefly, the extruders serve to melt and homogenize the thermoplastic and transport it at a constant rate of flow under a constant pressure condition to the die. Undoubtedly, the extrusion process is the most important method of transformation of the polyolefins. With the extruder, various plastic articles, including tubes, plates, thin sheets, filaments and cables, fibers and films, can be obtained which are of great commercial interest.

Coextrusion is characterized by the simultaneous extrusion of several layers of raw material with their own characteristics which complement each other in order to obtain a complex final product with properties normally impossible to obtain with a single raw material