Microwave New Zealand Ltd's radio frequency heating systems are suited for -
Frozen food tempering or thawing, producing excellent temperature uniformity, and with greatly reduced drip-loss and handling.
Drying and finish-drying of foods, textiles and building materials such as timber.
Easy retro-fitting to many processes including vacuum vessels and pressure vessels.
Click on the components below for more information.
Radio Frequency (RF) Heating Systems
Microwave NZ builds and supplies radio frequency generators with a wide range of power levels, operating at one of the industrial, scientific and medical (ISM) frequencies (e.g., 6.78MHz, 13.56MHz, 27.12MHz, 40.68MHz). These generators can be supplied as stand-alone units or as turn-key systems with applicators for applying the radio-frequency energy to the material to be processed.
Some generators have continuously adjustable output power from full power down to zero power, while others may have a reduced range of adjustment.
Choice of both frequency and RF applicator configuration can be important to reduce the maximum electrode voltages and thereby reduce the chance of arcing in the load material or on the electrode faces.
Microwave NZ designs, builds, and supplies radio frequency applicators for applying RF energy to the material to be heated. Applicators can be supplied for both batch and continuous processing where the radio frequency energy is applied by using metallic electrodes which couple to the material to be treated. These can give different heating uniformity depending on the specific electrode shape and whether they are "balanced" or "un-balanced".
Radio frequency applicators often include lumped tuning elements such as air-spaced or vacuum capacitors and inductors to ensure that all of the RF energy is transferred to the material.