Binder Jetting is an additive manufacturing process that uses two materials to create parts. The first is a binder which is usually in liquid form and second is the build material which is in powder form. The liquid binding agent is selectively deposited on the powder particles bonding the powder together to form a solid part.
First a roller spreads the powder material over the build platform. The print head then deposits the binder adhesive on top of the powder where required. Once the layer is complete the build platform will lower itself. The roller then spreads another layer of powder over the previous layer. Unbound powder remains around the part while its being built. The process is repeated until the part is complete.
Binder jetting is generally a faster 3D printing process than others. The two material approach allows for a large number of different binder-powder combinations and various mechanical properties of the final model by changing the ratio of the two materials.
The materials commonly used in Binder Jetting are metals, sand, and ceramics that come in a granular powder form. As with other powder based manufacturing methods, the object being printed is self-supported within the powder bed and is removed from the unbound powder once completed. The technology is often referred to as 3DP technology and is copyrighted under this name.
Binder Jetting 3D Printing is ideal for:
- forward - Fabrication of full-color prototypes
- forward - Manufacture very large parts
- forward - Low to medium volume production
Technical Specifications for Binder Jetting
forward Standard Lead time: Minimum 4 working days depending on part size, number of components and finishing requirements lead time may increase.
forward Standard Accuracy: ± 0.1%
forward Layer thickness (resolution): 0.06 mm – 0.15 mm
forward Minimum Wall thickness: 1mm
forward Max dimensions: 380mm x 330mm x 450 mm.
forward Surface finishing and Post Processing: Unfinished parts typically have a grainy surface. Binder jetting parts can be polished to give a smooth finish.
All three types of materials can be used with the binder jetting process