Multi Jet Fusion is a powder bed fusion technology that builds up the manufactured parts layer-by-layer.
First, a movable unit distributes a thin layer of thermoplastic powder. Another movable unit, moving in the orthogonal direction, is equipped with two infrared lamps and a dosing system for the agents to be distributed on the powder bed. The first lamp preheats the powder bed to just below the melting point. Unlike other additive manufacturing technologies, MJF does not require an energy-consuming laser.
Next, the fusing and detailing agents are then applied. Finally, another fusing lamp is attached to this moving unit, fusing the powder to the underlying layer where the fusing agent was applied. This fusing agent increases the absorption of the material for infrared radiation and ultimately causes the grayish discoloration of the components. The detailing agent evaporates during this process and ensures no surrounding powder melts onto the contour. This process ensures sharp edges and dimensional accuracy.
This process begins again for the next layer.
Multi Jet Fusion is usually used for prototypes and functional prototypes. This technology is especially suitable for prototypes that require good mechanical properties (e.g., prototypes for injection molding parts) or need to be used for testing. It is also capable of producing high-quality end-use parts. Plus, unused powder can partially be reused for the next production cycle
As most MJF materials are biocompatible, the technology is often used for orthotics and prosthetics.
Managing Director and Co-Founder at Hopper Mobility
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