Improvement of flexural strength and compressive strength by heat treatment of PLA filament for 3D-printing

Abstract

Poly-lactic Acid (PLA) is an environmentally friendly material with better stability in heat shrinkage than Acrylonitrile Butadiene Styrene (ABS), such as warping in 3D printing. This study focused on the enhancement of the mechanical properties of PLA filament for 3D printers through different heat treatment temperature and heat exposure time of PLA samples. The results showed that the highest flexural strength was recorded in the PLA sample that went through heat treatment at [Formula: see text] and heat exposure time of 300 s. And it tended to decrease with temperature and time after this point. But it has higher flexural strength than neat PLA. The compressive strength showed the highest compressive strength through heat treatment at [Formula: see text] for 600 s. Because compressive strength has no threshold limit temperature in experimental temperature, compressive strength showed a tendency to increase with increasing heat exposure time and high temperature at same condition. This result showed that the heat treatment process affects the flexural strength and compressive strength and can be improved upon using appropriate heat treatment conditions.

FDM-Based 3D Printing of Polymer and Associated Composite: A Review on Mechanical Properties, Defects and Treatments

“…Several experiments have been conducted on PLA printed parts, as PLA is one of the most commonly used polymers in FDM. As per Hong et al’s [ 243 ] work, it was noted that the mechanical properties including flexural strength and compressive strength were increased due to heat annealing. The bonds between the layers became much stronger with higher temperatures and longer exposure, whereas a sample treated at 140 °C for 600 s showed the maximum bond between layers.…”

“…Heat treated specimens increased their layer and raster adhesion. ( a , b , d , e ): [ 243 ], ( c , f ): [ 242 ].…”

Optimization of Printing Parameters to Maximize the Mechanical Properties of 3D-Printed PETG-Based Parts

“…For the first case, annealing is a postprocessing heat treatment commonly used to improve the mechanical properties and the superficial aspect [12]. Hong et al [13], for example, reported benefits in terms of bending and compressive strength for PLA of around 58.3% and 39.8%, respectively, after heat treatment. In this study, the highest bending strength was obtained at 130 • C for 300 s, while the highest compressive strength was observed at 140 • C for 600 s. In this case, the heat treatment process reduces the debonding zones between the filaments; however, depending on the direction of the external load, the mechanical strength can be affected by slippage of the filaments.…”

Dynamic Characterization of Additively Manufactured Polylactide (PLA)

“…19 According to Hong JH et.al., the heat treatment method decreased the debonding of PLA filaments at high temperatures. 20 According to Wu.W et.al., PEEK samples exhibited greater tensile, bending, and compression strengths than ABS 3D printed samples. 21 Li L et.al., suggested a strength versus porosity formulation that may be applicable for various materials.…”