Additive manufacturing (AM), commonly referred to 3D printing, is a fabrication method that constructs objects by adding material layer by layer. This innovative technique enables the production of items that were previously unattainable. Among the various 3D printing methods, Binder Jetting(BJ) is an advanced manufacturing technique that involves the alternating deposition of a powder bed followed by the application of a binder are repeated until a three-dimensional part is formed. BJ printing utilizes a process of laminating by spraying a liquid binder material from a nozzle. While this method offers a short manufacturing time, but it necessitates post-processing step, such as powder removal and surface treatment, after the output is produced. At this stage, the initial strength of the printed products is crucial, as it determines the feasibility of post-processing and is closely linked to the quality of the final product. In this study, when an inorganic binder is used in BJ sand printing, a polymer-based curing additive mixed with sand was reviewed to improve the initial strength of the printed products. The flow characteristics of sand that change according to the concentration and ratio of curing additive were confirmed through a Revolution powder analyzer(RPA), and the optimal usage ratio was derived through an actual printer recoater test. In addition, the initial strength characteristics of the printed products according to the usage ratio were checked and the commercialization potential of the hardener was examined through actual lamination tests.
