Volumetric Feeding
In volumetric feeding, material is fed based on its volume.
What are the key characteristics of volumetric feeding?
The feeder dispenses a defined volume of material per unit of time, without continuously measuring the actual weight. This process is particularly suitable for bulk materials with largely constant material properties and uniform bulk density.
Volumetric feeding is used in numerous industrial processes to feed powders, granules, pellets, or other bulk materials on a continuous or batch basis.
How does volumetric feeding work?
The amount of dispensed material is determined by the feeder's delivery volume. In a screw feeder, for example, the feed rate depends on the screw's volume and speed. The faster the screw rotates, the more material is conveyed within a specific period of time.
Unlike with gravimetric dosing, the actual mass being conveyed is not continuously monitored by weighing. If the bulk density of the material changes, the actual mass dispensed may vary even though the delivery volume remains constant.
When is volumetric feeding a good solution?
Volumetric feeding is particularly suitable for good-flowing bulk materials with a relatively constant bulk density, and for applications that do not require continuous weight monitoring.
The properties of the bulk material play an important role in the choice of technology. Fluctuations in bulk density, changes in flow properties, or uneven refilling of the feeder can affect feeding accuracy.
If particularly high accuracy is required or material properties fluctuate significantly, gravimetric feeding may be the best option. Which feeding principle is suitable always depends on material and process requirements.