Dzaky Alamsyah Hafidz, Heru Suryanto, Aminnudin, Fikri Munif Nashrullah, Jibril Maulana
Polylactic Acid (PLA) is a popular material for 3D printing. PLA has the advantage of being biodegradable and derived from renewable resources. This study aims to determine the characteristic of recycled PLA extruded at various screw speeds. The extrusion process used a twin-screw extruder with screw speed as an independent variable consisting of 4 different screw speeds: 50 rpm, 60 rpm, 70 rpm, and 80 rpm, while the pulling speed and temperature of extrusion as control variables. The dependent variables are cross-sectional area, tensile strength and modulus elasticity obtained from tensile tests, fracture morphology observed using SEM, and structure observed using XRD. Results show the average cross-sectional area of filament increases along with higher screw speed. The overall tensile strength graph shows an increase in the average tensile strength of filament as screw speed increases, except for a speed of 70 rpm, where there is a decrease. The elastic modulus graph shows an unstable increase caused by flow instability. The fracture morphology of the filament gets rougher and more fibrous as the screw speed increases. XRD analysis shows that recycled PLA filament indicates peaks at 2θ=18° to 20.5° in 4 variables and that different screw speeds do not change the crystal structure of PLA. © 2024 American Institute of Physics Inc.. All rights reserved.
Department of Mechanical Engineering, Faculty of Engineering, Universitas Negeri Malang, Jl. Semarang No. 5, East Java, Malang, 65145, Indonesia