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The conventional recycling method of aluminum by remelting the scraps is causing environmental problems, material losses, and depletion of energy resources. This paper aims to present an eco-friendly recycling technique for the aluminum alloy AA2011. The chips obtained from the turning operation were collected, compacted into billets, and hot extruded. Experiments were planned according to the design of experiments (DOE) approach. The recycling process parameters were extrusion temperature and ratio. Regression analysis (RA) and analysis of variance (ANOVA) were conducted, and significant mathematical models were obtained. The adopted equations demonstrated the effect of the extrusion parameters on the ultimate tensile strength and the yield strength of the extruded aluminum. The results showed that the extrusion temperature and the extrusion ratio significantly influenced the tensile and yield strengths of the samples. An Optimization process was carried out to maximize the abovementioned mechanical properties of the extrudates. Metallographic analysis was also performed to study the bonding quality between the chips.

Surface topography (as Roughness) and gloss of the thermoplastic are affected by varying in painting parameters greatly. Gloss of thermoplastic reflects light through the surface in a specular direction, it is a quality factor in the visual test of final products. Surface roughness of a thermoplastic had a role in determination of optical behaviour and aesthetic appearance. The experiments presented in this paper shows the effect of painting parameters changing on gloss and surface topography of thermoplastic parts. Eight painting parameters were chosen to study their effect. Gloss and roughness measured for the molded samples which molded in a mold-cavity with a rectangular impression in Arburg all-rounder 320C-600250/molding machine (figure 1) that mounted at conveyor of an automated spray-painting machine. And then the parameters of painting (material pressure, gun height, oven drying temperature time, and gun angle) were changed each trial to see its effect.