The process of implementation of composite materials is an important step that affects the final properties of the material. The process of implementation of mate­rial composites (thermoplastic matrix reinforced with natural fibers) is carried out

using the extrusion process, which allows the mixture of the two components at molten state. Melt blending processing is considered the method most used to com­pound material composites (Arrakhiz et al. 2013a), it’s more economical, flexible for formulation (Abu-Zahra et al. 2010), and compatible with industrial practice (Kannan et al. 2010). The conditions of implementation are selected so as to

homogenize the fiber/matrix mixture and ensure a good dispersion/distribution of fibers in the matrix, without degradation or fiber polymer matrix.

Extrusion is a process of forming material, but also for the continuous production of final or semifinal products (compound as granules, films, plates, tubes, insulation of cables….) within a system screw/barrel called extruder (Qaiss and Bousmina 2011). The term “extrusion” characterizes the processes constituting to force a material to

flow through an orifice (the dye). The matrix is then carried under the action of pressure obtained by screws. Polymers in the form of powders and pellets are drawn from a hopper of the gap between a rotating screw and heated barrel. They are car­ried forward, compacted, and the melt is convoyed through the dye before solidifi­cation by external cooling. Extrusion process offers also, the possibility to add support for the new polymer composites.

A various concentration of natural fibers (0, 5, 10, 15, 20, 25, 30 wt.%) were blended simultaneously with thermoplastic polymer using a single or twin screw extruder operating at 125 rpm screw for the polymer and 40 rpm for natural fibers. The extruder barrel (seven zones), was heated from hopper to dye in the case of natural fibers at optimized temperatures (respectively to 200, 200, 200, 180,180,180, and 180 °C) (Qaiss et al. 2012, 2013). The fibers are fed from the third heating zone to minimize the residence time of fibers and avoid fibers degradation. The compos­ites (cordon out of the extruder) were cooled in a water bath and then pelletized into granules of 2 mm length. The final shapes of the specimens for various characteriza­tion analyses were molded in an injection molding machine. The optimized tem­perature of injection press barrel was fixed at 200 and 180 °C for nozzle, the mold temperature was fixed at 45 °C (Arrakhiz et al. 2013a).