Najaf Zadeh Hossein, Bowles Daniel, Huber Tim, Clucas Don
College of Engineering, University of Canterbury, Private Bag 4800, Christchurch 8020, New Zealand.
Biomolecular Interaction Centre, University of Canterbury, Private Bag 4800, Christchurch 8020, New Zealand.
Materials (Basel). 2021 Nov 18;14(22):6988. doi: 10.3390/ma14226988.
Screen-additive manufacturing (SAM) is a potential method for producing small intricate parts without waste generation, offering minimal production cost. A wide range of materials, including gels, can be shaped using this method. A gel material is composed of a three-dimensional cross-linked polymer or colloidal network immersed in a fluid, known as hydrogel when its main constituent fluid is water. Hydrogels are capable of absorbing and retaining large amounts of water. Cellulose gel is among the materials that can form hydrogels and, as shown in this work, has the required properties to be directly SAM, including shear thinning and formation of post-shearing gel structure. In this study, we present the developed method of SAM for the fabrication of complex-shaped cellulose gel and examine whether successive printing layers can be completed without delamination. In addition, we evaluated cellulose SAM without the need for support material. Design of Experiments (DoE) was applied to optimize the SAM settings for printing the novel cellulose-based gel structure. The optimum print settings were then used to print a periodic structure with micro features and without the need for support material.
丝网增材制造（SAM）是一种生产小型复杂零件且不产生废料的潜在方法，生产成本极低。包括凝胶在内的多种材料都可以用这种方法成型。凝胶材料由浸入流体中的三维交联聚合物或胶体网络组成，当其主要组成流体为水时称为水凝胶。水凝胶能够吸收并保留大量水分。纤维素凝胶是能够形成水凝胶的材料之一，如本研究所示，它具有直接进行丝网增材制造所需的特性，包括剪切变稀和形成剪切后凝胶结构。在本研究中，我们展示了用于制造复杂形状纤维素凝胶的丝网增材制造方法，并研究连续打印层是否能在不分层的情况下完成。此外，我们评估了无需支撑材料的纤维素丝网增材制造。应用实验设计（DoE）来优化用于打印新型纤维素基凝胶结构的丝网增材制造设置。然后使用最佳打印设置来打印具有微特征且无需支撑材料的周期性结构。
