We investigated the possibility of using high-frequency technology for the production of wood-plastic composites and determining the optimal conditions for pressing of such composites in a high-frequency press. We used wood chip fractions smaller than 1 mm and polyethylene (PE) as the matrix. We made three series of panels to determine the optimal pressing conditions, varying pressing time, wood chip moisture content, and wood content. The basis for determining the most suitable pressing conditions and panel structure was tensile and flexural strength. For the production of wood-plastic composites in a high-frequency press, we found that the optimal wood chip moisture content was 26%, with an optimal pressing time of 17.5 minutes using a power selection switch set to 3, an anodic current of 1 A, and a current of 0.5 A. The optimal wood content in the composite was found to be between 50% and 75%. We also compared the properties of composites made in a traditional press and a high-frequency press. The composite made in the high-frequency press exhibited better properties than the one made in the traditional press.
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