Abstract: A process and apparatus for ultrasonic cleaning of materials in which vibrating plates are used in close contact with a material to be cleaned. The material is placed in a shallow liquid and the vibrator of the plates eliminate dirt or contaminating substances from the material by cavitation of the liquid. The vibrating plates are flexurally vibrated at a frequency which correspond to its resonant frequency and is one of a sonic or ultrasonic frequency. The acoustic field created by the oscillation of the plates and in cleaning the material. A pledging system may also include ultrasonic vibrating plates to assist in expelling water.

Abstract: An apparatus and method for dehydrating solid products containing moisture, particularly food products, includes a hot gas stream device for creating a hot gas stream over the products to be dehydrated and an ultrasonic wave emitting system for directing ultrasonic waves over the products. The dehydrating apparatus includes a closed housing and at least one conveyor mounted in the housing for transporting the products. The ultrasonic wave emitting system includes a plurality of ultrasonic diffusing plates which are connected to sound wave generators and are in direct contact with the products.