Manufacturing Technical Paper

The head extrudes the semiliquid state thermoplastic

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Unformatted text preview: Deposition Low Costs, No Solvent Elevated Temperatures Modeling Required during process, Small range of materials. changed into different sizes for different road width and thickness. The monofilament is moved by two rollers and acts as a piston to drive the semi- molten extrudate. The extruded material solidifies and adheres to the preceding layer. At the end of each finished layer, the base platform is lowered and the next layer is deposited. The designed object is fabricated as a three- dimensional part solely based on the precise deposition of thin layers of the extrudate. The figure below shows the schematic of the fabrication process. An article by Samar Jyoti Kalita et al reported on the fabrication of porous PP- TCP composite scaffolds using the fused deposition modeling process [31]. The dense structures of the sample had an average diameter of 15 mm and an average thickness of 4 mm with a top surface area of 131 sq. mm. The average pore size was 160 microns. Figure 6: EM micrographs of dense and porous PP- TCP composite [31] Figure 5: Fused Deposition Modeling Schematic [12] Compared to the conventional method of fabricating scaffolds, this method also showed significant improvement in pore size consistency. Researchers have modified the method of deposition modeling. Xiong et al. developed another wise RP technique called low temperature deposition manufacturing (LDM) system that processes slurry material into frozen scaffold under temperature [32]. Woodfield et al, developed 3D fiber deposi...
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