Granular materials

GRANULAR STATE A granular medium is an assembly of many solid elements, which can interact for example in collisions, but also under the effect of electromagnetic or gravitational forces. Those elements, also known under the generic term grains, are generally arranged in a disordered way and often have differences in shape, size and surface condition. Granular media are found at all scales: fine compacted powders composing aspirin tablets, dunes of the desert, the ballast of the railways and...
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Additive manufacturing process optimisation Workflow

Workflow for process optimization  Granutools is proud to introduce the revolutionary workflow for the process optimization of 3D printing. The workflow is essential for parts producers, 3D printer manufacturers and powder companies. The workflow consists of the unique combination of the following three instruments for AM processs optimization. Workflow = GranuDrum + GranuPack + GranuCharge   Which Flowmeter for powder-bed-based additive manufacturing? In SLS (selective...
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Which Flowmeter for Powder-Bed-Based Additive Manufacturing?

In SLS (selective laser sintering), SLM (selective laser melting) and EBM (electron beam melting) techniques, successive thin layers of powder are created with a ruler or with a rotating cylinder. Each layer is partially sintered or melted with an energy beam (laser or electron beam). The layer thickness defines the vertical resolution. Therefore, a thin layer leads to a better resolution.   In order to obtain a thin layer, the powder is as fine as possible. Unfortunately, when the...
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GranuTools instruments range for powder flowability measurement: The basic principles

Selected geometries Different flow geometries are available to evaluate the rheological properties of a powder or a granular material. A consortium of French research groups called GDR Midi has studied these geometries carefully. In their publication dedicated to dense granular flows [1], the different geometries are analyzed: plane shear, annular shear, vertical-chute flows, inclined plane, heap flow, and rotating drum. Among these powder flow instruments, GranuTools has selected three...
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