عنوان مقاله [English]
In this study, using Autodesk Moldflow software, the injection molding process of ventilator’s poly (lactic acid) split filters was studied and the effective characteristics of this process were investigated and compared in two samples of crystalline and amorphous poly (lactic acid). The injection pressure for the crystalline sample showed a larger value in the simulation, which was justifiable due to the higher melt viscosity of the crystalline sample than the amorphous sample. The results of this study also showed that the cooling time required for the sample was longer, which was attributed to the difference in temperature distribution between the two samples as well as the difference in their thermal conductivity. Shrinkage and air trapping are other important characteristics in the injection process. The results showed that they were higher for the crystalline sample, which was as expected due to the difference in melt viscosity of the samples and the relationship between crystallization susceptibility and compression of polymer chains. Also, the rheological and thermal properties of selected polymers were analyzed and their relationship with effective injection factors was explained. Finally, the specifications of the injection molding machine suitable for the production of polymer filters were introduced based on the information available in the software.