Abstract

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Author(s):: WU Shuozhong1; TANG Xiaoyan2; YUN Zhong2; CHEN Ke2; 1. Light Alloy Research Institute, Central South University, Changsha 410083, China 2. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China

Keywords:: Keywords: polyvinyl alcohol carrageenan 3D printing critical collapse angle

Abstract:: Abstract: Based on the physical, biological and specific cross-linking characteristics of biopolymer materials polyvinyl alcohol(PVA) and carrageenan(CRG), a CRG/PVA composite hydrogel bio-ink material that can be used for 3D printing is prepared, thereby providing material for the process study. A set of 3D printing system suitable for CRG/PVA composite hydrogel extrusion printing is constructed, and on this basis, the effects of process parameters such as piston extrusion speed, nozzle moving speed, printing height, line spacing, etc.on the dimensional accuracy of the hydrogel are studied and analyzed. With the extrusion speed of 0.3-0.6 mm/s, the nozzle moving speed of 15-20 mm/s, the printing height of 0.3-0.6 mm, and the line spacing greater than 1.4 mm, the 3D printing resultof CRG/PVA composite hydrogel is the optimal.The experiment on the critical collapse angle of the hydrogel showed that the support structure designed for 3D printing canincrease the critical collapse angle of the hydrogel, so that the large tilt angle structure alsocan be successfully printed.