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以粒料醋酸纤维素(CA)为实验材料,用熔体微分粒料3D打印机制备了拉伸测试样条,分析了样条颜色变化的原因。利用桌面级挤出机将粒料CA挤成丝料,并用桌面级丝料3D打印机制备了同样的拉伸样条,分析了其翘曲的原因。对2种不同打印机成型的样品进行拉伸性能测试,对比了2种打印方式成型制品的力学性能。利用CA溶于有机溶剂的特点,将粒料打印机制备的部分样条用丙酮进行黏结,并进行黏结强度测试,探究了CA大型制品分块打印、黏结成型的可行性。研究结果表明,粒料打印机与丝料打印机成型样条的平均最大拉伸应力为19.18和7.05 MPa,2种试样使用丙酮黏结的黏结应力为6.72 MPa,分析了强度差异的原因。由于2种打印机制备的样品各有不足,因此,总结了制品缺陷的原因以及CA成功用于3D打印成型的经验。
Tensile test strips were prepared by melt differential granularity 3D printer with granular cellulose acetate (CA) as the experimental material, and the reasons for the color change of the splines were analyzed. The pellet CA was extruded into a strand using a table-level extruder and the same tensile spline was prepared using a desktop-grade silk-screen 3D printer and the reason for its warping was analyzed. Tensile properties were tested on the samples formed by two different printers, and the mechanical properties of the two products were compared. Based on the characteristics of CA dissolved in organic solvent, some spatches prepared by the pellet printer were bonded with acetone, and the bond strength was tested to explore the feasibility of block printing and bond forming of large-scale CA products. The results show that the average maximum tensile stress of the spline printer and the silk screen printer is 19.18 and 7.05 MPa, respectively. The bonding stress of the two samples using acetone is 6.72 MPa, and the reason of the difference in strength is analyzed. Due to the inadequacies of the samples prepared by the two printers, the reasons for the product defects were summarized and the CA’s experience in 3D printing was successfully used.