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Fused Granular Fabrication, FGF

Additive manufacturing method in which melted plastic granules are deposited on a bed layer by layer to bild the product.


The process

The product is formed on a movable platform construction [1]. Plastic Granules supplied to a vertical screw extruder melts the granules down to a molten homogeneous plastic mass. The mass is pressed through an interchangeable nozzle [4] where the flow is controlled by the diameter and shape of the nozzle orifice. Larger throughput results in higher construction speed but lower surface roughness and vice versa.

The mass deposited through the nozzle at constant speed and a cross section of a CAD model is built up. After each layer the building platform is lowered [5] and the next layer is added.

If necessary a supportive structure is printed [6] to enable overhangs. Finishing in the form of removal of these support structures are required.

Sanding, painting or working surfaces may be required if higher surface finish is desired.

Product examples
T-rex huvud
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Advantages and disadvantages
In comparison with alternative methods
High production capacity
Next to all polymers can be used
High material usage rate
Faster for large products
Good for evaluating new materials and material mixtures
High durability in manufacturing production
Teknisk data
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