Improvement of the method of measuring the temperature distribution of polymer composite sheet materials when heated by microwave radiation

The actual problem of accelerating and reducing the energy costs of the sheet polymer composite material heat  treatment technological process is considered. It is shown that to solve this problem, it is advisable to use the microwave radiation energy as a heating source. The main advantages of the microwave method of the sheet polymer composite material heat treatment in comparison with traditional methods are considered. The design of a continuous-acting microwave installation with transverse interaction has been developed, which forms a uniform temperature distribution in the volume of sheet composite material, which makes it possible to obtain products with higher physical and mechanical characteristics. To calculate the temperature distributions over the width and thickness of the sheet material, the model and the method of loaded long lines  are used, respectively, taking into account the change in the dielectric parameters of the composite material from temperature, and the theory of the electromagnetic field. A method for measuring the temperature distribution of a sheet polymer material is proposed. The results of theoretical and experimental studies of the temperature distribution over the width and thickness of a sheet polymer material with a width of 500 mm and a thickness of 30 mm, a density of 2400 kg/m³ at the frequency of electromagnetic field oscillations of 2450 MHz are presented. The obtained experimental results showed a high efficiency of microwave radiation usage for technological processes of the sheet polymer composite material heat treatment. Technologies that use microwave radiation can be applied for heat treatment of products made of concrete, foam concrete, as well as polymer composite materials based on carbon or basalt filaments, and thermosetting epoxy resins as a binder.

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