METHOD OF DRYING DIELECTRIC MATERIALS AND APPLIANCE FOR DRYING DIELECTRIC MATERIALS

摘要

The method of drying dielectric materials is based on at least 2 phases. In Phase I the reduced in size dielectric material is dried in the initial process starting from the initial moisture of the dielectric material in the range from 80% to 90% to the level of 20% to 45%. After that in Phase II the initially dried dielectric material is dried with the use of microwave energy, that is carried out in a rotating cylindrically shaped chamber with the use of pressure level from 1kPa to 6kPa and frequency of microwave energy in the range of 600 MHz t0 6 GHz and with the delivered microwave power of 2W to 40 W per gram of the dried material leading to obtain the moisture level of 8% to 30%. In this phase the material is heated up to the temperature not greater than 80 degrees Celsius. Subsequently the final drying process is carried out to obtain moisture level from 6 to 10%. The method to dry dielectric materials equipped with product preparation segment, initial drying, microwave chamber and final drying segment. The microwave chamber has a cylindrically shaped chamber of the form of a dielectric cylinder 5 inside its metal cavity 6. Additionally, metal cavity 6 is connected to the vacuum pump 7 and is equipped with microwave generators 8 characterised by low ripples of microwave power Tau < 20%.