Physical and Mechanical Characterization of Injection Moulded Parts from Recycled Polyethylene Packaging Caps

Abstract

The common disadvantage of recycled plastics is the deterioration of physical properties. The study investigates the physical and mechanical properties of injection moulded parts fabricated from recycled polyethylene packaging caps. The properties of these recycled parts were systematically compared to those of parts made from virgin polyethylene. Initial characterization involved Fourier transform infrared spectroscopy to identify material composition. Subsequent assessments included measurements of weight, dimensional stability, tensile strength, and elongation at maximum force. Surface structure, colour, and gloss were also evaluated. The results indicated a significant reduction in elongation at maximum force for the recycled parts compared to their virgin counterparts, with only minor variations in tensile strength. Structural analysis revealed the presence of impurities and non-homogenized plastic streams within the recycled material. Additionally, noticeable differences in colour and gloss were observed across of different sample series. This study underscores the impact of recycling on the mechanical performance and aesthetic properties of injection moulded polyethylene parts.