적층 제조용 HDPE 소재의 용융지수 및 유리섬유 첨가에 따른 압출 형상 특성 분석 = Analysis of Extrusion Shape Characteristics based on Melt Index and Glass Fiber Content of High-density Polyethylene Materials for Additive Manufacturing

다국어 초록 (Multilingual Abstract)

In material extrusion additive manufacturing, extrusion throughput and bead shape are key factors affecting deposition quality and productivity. This study investigated the effects of melt index (MI) and glass fiber (GF) reinforcement on the extrusion behavior of HDPE-based materials. Three neat HDPE materials and two HDPE+GF composites with different MI values were extruded under identical conditions, and their extrusion throughput, bead thickness, and shape stability were evaluated. The results showed that the average extrusion throughput increased with increasing MI, whereas bead thickness decreased. The HDPE+GF composites exhibited better shape stability than neat HDPE; however, brittle fracture behavior was observed under bending deformation. These findings suggest that the extrusion throughput, bead shape, and shape stability of HDPE-based materials should be evaluated in advance according to MI and GF reinforcement before applying them to material extrusion additive manufacturing.