Abdul Hayyi, Heru Suryanto, Aminudin, Jibril Maulana
Polylactic acid (PLA) is an environmentally friendly polymer derived from plant starch, including corn and sugar cane. PLA has been identified as a very promising biopolymer that has the potential to replace conventional plastics in many applications. This study aims to determine the tensile strength of recycled PLA filament in the extrusion process with variations in the pulling of filament products. Methods include recycling the PLA filament using the extruder three times at a barrel temperature of 170°C and screw speed of 60rpm. Product filament was pulled by pelletizing machine with various speeds of 65rpm, 75rpm, and 85rpm. Mechanical properties of resulted filament were observed using the tensile testing machine. Results show that the tensile strength of the filament with a pulling speed of 65rpm has a tensile strength of 51.15MPa and a strain of 4.6%, a sample with a pulling speed of 75 pull has a tensile strength of 50.48MPa and a strain 4.31% and the sample with a pull of 85rpm has a tensile strength of 543.92MPa and a strain of 3.63%. The recycled PLA filament with a pulling speed of 65rpm has a smooth filament surface, and the fracture after the tensile test formed a cup. Filament with a pulling speed of 75rpm forms a slightly oval PLA filament. The surface fracture shows the river pattern, coarse grain, and the appearance of stringy fractures at a pulling speed of 75rpm, a very rough surface formation, and cracks occur. It can conclude that the second recycled PLA filament sample with variations in the pulling speed of 65 RPM was the best process because it had the greatest tensile strength and smooth surface filament. This process parameter can be applied for reducing PLA waste and utilize it as filament product in additive manufacture industry. © 2025 Author(s).
Department of Mechanical Engineering, Universitas Negeri Malang, Jl. Semarang No 5, Malang, 65145, Indonesia; Center of Excellence for Cellulose Composite (CECCom), Department of Mechanical Engineering, Universitas Negeri Malang, Jl. Semarang No 5, Malang, 65145, Indonesia
