Feeder

What are feeders used for?

Depending on the application, materials like powders, granules, pellets, flakes, or fibers can be dispensed. Feeders are a central component of industrial feeding technology and are used wherever raw materials, additives, or other components need to be dispensed with precision.

How does a feeder work?

The operating principle depends on the specific design and feeding task. In screw feeders, for example, material is discharged from the hopper via a rotating screw and supplied to the process. Vibrating feeders, on the other hand, transport bulk material via vibrations. Other types include weigh-belt feeders, among others.

Feeders can operate volumetrically or gravimetrically. In volumetric feeding, the amount supplied is determined by volume. In gravimetric feeding, weight or material flow is also measured. One typical version is the loss-in-weight feeder, which weighs the feeder and hopper together. Deviations can thus be detected and the feed rate adjusted accordingly.

Which feeder is suitable for which bulk material?

The selection of the appropriate feeder depends on both process requirements and the properties of the material to be dispensed. Bulk density, particle size, and especially flowability influence how a bulk materialcan be discharged and fed. For example, free-flowing granules place different demands on feeding technology than cohesive powders or fibrous materials.

Other selection criteria include required feed rate and feeding accuracy, continuous or batch feeding, as well as requirements for cleanability and product changes. The interaction between material, feeder, and process is crucial. A feeder suitable for the purpose ensures a consistent material flow and helps ensure reproducible processes and consistent product quality.