PA12 Powder Recycled from SLS for FDM

Abstract

In this study, Polyamide 12 (PA12) powder recycled after selective laser sintering (SLS) was made into filaments for fused deposition modelling (FDM). Compared with fresh PA12, the melt flow rate (MFR) of the recycled PA12 powder decreased by 77%, but the mechanical properties were only slightly reduced. In FDM, the printing speed and building orientation were changed, and the performance of the printed parts was tested. If the printing speed is too fast or too slow, the mechanical properties of the parts will be affected, and there is an optimal speed range. The tensile strength, flexural modulus, and impact strength of a printed test sample made from recycled powder reached 95%, 85%, and 87% of an x-direction test sample made from fresh PA12, respectively. For test samples printed from different orientations, the mechanical properties of the test samples printed in the x-direction were the best, while the crystallization performance was the opposite. Scanning electron microscope (SEM) images show that the printed test sample had good compactness and mechanical properties, and the delamination phenomenon was basically not observed.

Characterisation of Polyamide (PA)12 Nanocomposites with Montmorillonite (MMT) Filler Clay Used for the Incremental Forming of Sheets

“…The mentioned polymer is white and in powder form with an average grain size of 60 μm [64]. It is primarily used in the additive selective laser-sintering (SLS) process to shape an object [65,66,67,68] with excellent material properties, such as high strength and stiffness, excellent long-term constant behaviour and bio-compatibility [64]. According to the manufacturer’s data [64], this PA12 2200 polymer has the melting temperature at T m = 176 °C.…”

A Review of Methods Used to Reduce the Effects of High Temperature Associated with Polyamide 12 and Polypropylene Laser Sintering

“…In this regard, an increase in building time and temperatures leads to an increase in the crystallinity of PA-12, which affects the built parts [9,[32][33][34][35]. In this respect, a high degree of crystallinity is associated with higher shrinkage of printed components and lower ductility, which affects the dimensional and geometrical accuracy, as well as surface finish of the printed parts [17].…”

Svojstva nanokompozita otpadnog poliamidnog praha i titanijeva dioksida

“…izrade jednog modela. 1,2 Najvažniji polimerni materijali koji se upotrebljavaju u SLS procesu su poliamidi čiji je glavni predstavnik poliamid 2200 (PA 2200), vrsta poliamida 12 koja je strukturirana specifično za primjenu u SLS procesu. Udio poliamida 12 na tržištu vezanom uz SLS proces veći je od 95 %.…”