ABSTRACT
Powder feeders play an important role in powder-handling processes such as feeding raw materials or discharging product materials from a storage vessel. The powder load or mass to be treated in the processes depends on the accuracy of the feeders. Product quality might depend on the powder load, and low-quality materials will be produced if the load is too high for the process. Feeders should be selected carefully, because some feeders might be unsuited to the process, resulting in a failure of feeding itself. Further, dynamic characteristics of the feeders could also affect the accuracy of feeding. If the feeder cannot respond to a fast change in the manipulating signal, a fl uctuation of fl ow caused by a disturbance cannot be suppressed and could cause a dynamic error in the feeding process.
