Univ. Grenoble Alpes, CNRS, Grenoble INP, Institute of Engineering Univ. Grenoble Alpes, LGP2, F-38000 Grenoble, France; Univ. Grenoble Alpes, CNRS, Grenoble INP, Institute of Engineering Univ. Grenoble Alpes, 3SR, F-38000 Grenoble, France.
Univ. Grenoble Alpes, CNRS, Grenoble INP, Institute of Engineering Univ. Grenoble Alpes, LGP2, F-38000 Grenoble, France.
Carbohydr Polym. 2019 May 15;212:119-128. doi: 10.1016/j.carbpol.2019.01.076. Epub 2019 Jan 25.
An optimized paste based on short natural cellulose fibers combined with carboxymethyl cellulose at a high dry content (42 wt.%) was implemented as a bio-based material for 3D printing by extrusion. The homogeneous paste exhibited a pronounced thinning behavior and yield stress; it was extruded using a screw extrusion-based direct ink writing system and could easily flow through a small nozzle. The optimized formulation enabled accurate additive manufacturing of parts using a natural air-drying process with or without an ethanol bath. We characterized the anisotropic shrinkage that occurred during the drying of 3D printed parts and proposed a compensation method to account for it. The obtained results emphasized that cellulose had a strong potential to be used as a raw material for 3D printing of cheap, lightweight, robust, and recyclable parts.
一种基于短天然纤维素纤维并在高干含量（42wt.%）下结合羧甲基纤维素的优化糊剂被用作通过挤出进行 3D 打印的生物基材料。这种均匀的糊剂表现出明显的变稀行为和屈服应力；它使用基于螺杆挤出的直接喷墨书写系统挤出，可以轻松地流过小喷嘴。优化的配方使得使用自然风干过程（有无乙醇浴）都可以精确地制造出零件。我们对 3D 打印零件干燥过程中发生的各向异性收缩进行了表征，并提出了一种补偿方法。所得结果强调了纤维素在 3D 打印廉价、轻便、坚固和可回收零件的原材料方面具有很大的潜力。
