AUTOMATED CONTROL OF HF ELECTROTHERMY OF ORGANIC AND POLYMERIC MATERIALS TAKING INTO ACCOUNT RESONANT PHENOMENA

Abstract

The paper presents an overview of existing technological systems designed for ultra-high-frequency and high-frequency electro-thermal and dielectric processing of polymer, organic and biological materials. A comparative analysis of electrothermia and other types of heating and theirs advantages are described. Deficiencies in control systems and automation capabilities of existing high-frequency industrial equipment have been identified. The optimal industrial frequency of high-frequency exposure allowed for industrial use has been evaluated. The main controlled parameter for non-intrusive heating was determined in order to improve and activate (seeding) the processed material. (Research purpose) The research purpose is developing a method of electrothermal treatment of organic and polymer materials and its automated control, excluding the influence of various little-studied processes. (Materials and methods) The theoretical justifications showing the uneven heating of the samples were confirmed by field tests. Heating is mainly carried out on the surface of the samples, which often leads to their melting. The method of heating with the use of high-frequency electrothermia, which is free of these disadvantages, was studied. Industrial high-frequency equipment of the UZP 2500 model was used in the experiment. (Results and discussion) The paper presents the results of the use of the electrothermia process and the analysis of the technological process of controlling high-frequency processing on the example of samples of polymer composites similar to natural organic materials. A resonant phenomenon manifested when exposed to high-frequency electrothermia was described. The paper presents the solution of its accounting in the organization of the management process. We have developed technical equipment, selected processing modes for organic and polymer materials. (Conclusions) The practical possibilities of the proposed method of automated control of high-frequency electrothermia of organic and polymer materials used in industry and agriculture during transportation and preparation for their operation, as well as prolongation of their residual life during storage, have been revealed.