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\subsection*{Técnicas de preparação de filmes antioxidantes}  Although the manufacture of active films by casting is a procedure widely used during film development, it cannot be considered a standard production process (Gómez-Estaca et al., 2014). However, the fact has the advantage that some studies have demonstrated casting processes that produce materials with less loss of antioxidant in the film with respect to the nominal content owing to less aggressive processing and manufacture conditions (Lopez-de-Dicastillo et al., 2010), especially when compared with other techniques such as extrusion and coextrusion multilayer films and laminates who cuff their the material structure through the thermo-mechanical processes caused by processing and consequently potentiating the degradation of the antioxidants present in the system.  According to Rauwendaal, (2011) to extrude means to push or to force out. Material is extruded when it is pushed through an opening. The part of the machine containing the opening through which the material is forced is referred to as the extruder die. As material passes through the die, the material acquires the shape of the die opening, this shape generally changes to some extent as the material exits from the die. There are two basic types of extruders: continuous and discontinuous or batch type extruders. Continuous extruders are capable of developing a steady, continuous flow of material, and utilize a rotating member for transport of the material, whereas batch extruders operate in a cyclic fashion and generally have a reciprocating member to cause transport of the material.  The extruder is basically composed of one or two rotating Archimedes screws fitted in a barrel in order to progressively increase the pressure and push forward and mix the ingredients required to manufacture the commercial polymer through a die where expansion may take place and in spite of high operating temperatures (up to 200 °C) and pressures (over 10 MPa) as well as high shear rates, the processing of polymers by extrusion, also known as hot-melt extrusion, is a widely used process in industry because it is a continuous quick, simple and versatile operation for transforming raw ingredients into finished products (Sauceau et al., 2011). Already coextrusion process consists in extruding different polymers in the same die in order to get a multi-layer product which combines the properties (mechanical, optical, adhesion, barrier) of the different layers (Agassant et al., 2013).    Currently the film extrusion technique is widely used for packaging industries, as it allows the manufacture of these materials on a large scale and the fact that the extrusion can be implemented as a continuous unit operation with control of temperature, size, shape, and moisture (Gómez-Guillén et al., 2009). Furthermore, processing parameters such as screw speed, temperature, feeding rate, and screw configuration carefully controlled. Even small variations during processing can resultin the production of very different products (Kerry et al., 2014).  \subsection*{Caracterização de filmes antioxidantes}