ExOne uses Binder Jetting technology to 3D print complex parts in industrial-grade materials. Binder Jetting is an additive manufacturing process in which a liquid binding agent is selectively deposited to join powder particles. Layers of material are then bonded to form an object. The printhead strategically drops binder into the powder. The job box lowers and another layer of powder is then spread and binder is added. Over time, the part develops through the layering of powder and binder.
Binder Jetting is capable of printing a variety of materials including metals, sands and ceramics. Some materials, like sand, require no additional processing. Other materials are typically cured and sintered and sometimes infiltrated with another material, depending on the application. Hot isostatic pressing may be employed to achieve high densities in solid metals.
Binder Jetting is similar to traditional paper printing. The binder functions like the ink as it moves across the layers of powder, which like paper, forms the final product. Due to its ability to produce solid layers, Binder Jetting is often considered the best option for 3D printing. Binder Jetting also has the ability to print very large objects. Room sized architectural structures have been printed with Binder Jetting.