Comparison of bulk strength, weldline strength, and deposition strength of 3D printing-manufactured article in Fossil PCs and Bio-based PCs

The deposition strength in FDM type 3D printing-manufactured specimen and the bulk and weldline strength in a specimen prepared by injection molding using fossil PCs and bio-based PCs were measured and compared. In the injection molded specimen, weldline strength and fracture elongation increased with increasing processing temperature. As for the results of the deposition direction tensile test, deposition strength and variation for fracture elongation in the 3D printing-manufactured specimen were marginal with an increase in processing temperature. On the other hand, the orthogonal to deposition direction tensile test revealed that both deposition strength and fracture elongation were proportional to processing temperature. The ratio of weldline strength and the strength in the orthogonal to deposition direction, which presented the lowest strength value in the 3D printing-manufactured specimen, was equivalent to 62.78% and 25.81% in fossil PCs and bio-based PCs, respectively. The ratio of strength in the deposition direction and orthogonal to deposition direction in the 3D printing-manufactured specimen was 69.97% and 51.52% in fossil PCs and bio-based PCs, respectively.