Multi Jet Fusion
Multi Jet Fusion (MJF) is a new powder-based 3D printing process that produces high-resolution and precise 3D objects with low porosity and high surface quality. In contrast to selective laser sintering (SLS), MJF completely dispenses with the use of a laser beam. An inkjet print head prints components by applying two different binder fluids to the surface of the powder bed.
Infrared light instead of laser radiation
MJF uses infrared lamps as an energy source; the lamps continuously illuminate the printing surface. The powder particles to be fused are wetted by the print head with a heat-conducting fluid (fusion agent). The particles absorb the heat of the lamps and fuse together as well as with the underlying layer. In order to prevent the powder particles from fusing with each other beyond the intended area, a heat-inhibiting fluid (detailing agent) is simultaneously applied around the contours of the component. This ensures that the surface of the 3D object will be uniform and smooth.
- High construction speed
- Process produces high density and low porosity components
- Ideal for the production of prototypes with functional and mechanical properties
Polyamide (PA) plastics are materials that feature long-term stability and resistance to mechanical stress. They are also highly resistant to many chemicals and are available in nearly all colors. We can produce impermeable objects on request. In addition to unfilled plastics, PROTIQ also uses filled, soft and hightemperature plastics.
The fine powder is based on polyamide 12 and is often used as a substitute material for injection molding materials and fully functional components. A slightly rough surface is a characteristic of PA2200 objects.
Multi Jet Fusion in the application
Producing functional and mechanically resilient prototypes with extremely short processing time – that is the great strength of Multi Jet Fusion technology (MJF). A construction speed of up to three centimeters of object height per hour makes it one of the fastest in 3D printing processes. For additive manufacturing, the record-breaking construction time is a trend-setting advance, as machine time is still one of the main price factors in production.
Produce more economically thanks to shorter lead time
In order to reduce the manufacturing time of 3D objects and the associated unit costs, components are often manufactured with increased layer thickness – a cost-cutting measure that has a negative impact on surface quality. After all, the rule is: the thicker the individual layers are printed, the more pronounced the step effect becomes. Thanks to faster printing processes and the resulting shorter machine times, Multi Jet Fusion can even produce very fine layer thicknesses economically. This allows the production of high-resolution prototypes and functional small series at a comparatively low unit price.
High-resolution and extra stable 3D objects
In addition to the significant time savings, the Multi Jet Fusion process also impresses with outstanding component quality: with 1,200 dpi, the systems achieve a resolution on the XY axis that can be used to produce objects at the injection molding level. Up to 30 million drops of binder fluid are applied to the entire work area per second. Since the fusion agent completely penetrates the object, the individual layers fuse together particularly homogeneously. This provides the final 3D objects with a uniform stability that is largely independent of the construction direction.
3D objects made of temperature resistant plastic
The high-quality thermoplastic PA 12 is a suitable material for the new 3D printing process. It is temperature resistant and has excellent mechanical properties, making it a popular material for additive manufacturing. Further materials for the still young 3D printing process are already in the works: thanks to its open platform system, a large variety of materials will be available for Multi Jet Fusion in the future.
- Wall thicknesses from 1 mm
- Layer thickness 70–100 μm
- Solid-colored components
- Components up to 400 mm x 300 mm x 400 mm
- Tolerances: +/- 0.7%, min. 0.1 mm
- Slightly rough surface (due to powder grain size)
- Medium detail picture
- Slightly patchy components