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Recently, timber harvesting has increased significantly. As a result of which the volume of felling residues in felling areas and waste in the woodworking industry has also increased. The rapid growth of waste necessitated the processing of large volumes of wood pulp and the creation of new high-performance machines capable of shredding it into chips. Chips are usually used as fuel pellets, as well as for the manufacture of chipboard panels. The operation of chipping wood can be carried out during harvesting or a few days after the trees have been cut down. This article has examined the various types of disc chippers. They were distributed according to distinctive design features. The distinctive features of machines in terms of productivity, power, rotation speed, the number of cutting knives, dimensions and weight of the machine itself, as well as the type and size of the processed wood, the ways of feeding it into the machine and removing chips from it are described. It is shown that disk chippers are widely used in the manufacture of technological chips in the pulp and paper, woodworking, forestry and other industries. The review is based on the study of domestic and foreign material, analysis of the operation of existing machines of various types, as well as on numerous experimental and theoretical studies carried out by various authors. Our review of disc chippers will contribute to a more rational use and modernization of the existing chippers and the creation of new cost-effective equipment for chipping wood into chips, which meets the current level of development of technology and production

Forest fires are studied and developed in all countries with forest resources. However, despite large number of studies, the problem is still far from being resolved and fires still cause great damage to forests. The article deals with research on the influence of the screw drum parameters on the quality of removing the surface soil layer from combustible materials and on the performance of the forest fires soil-sweeping machine. The geometric parameters of the screw drum of the forest fires soil-sweeping machine were optimized. As a result of optimization, the optimal values of the screw channel depth in the range of 7.5-8.7 cm and the screw pitch of 23-40 cm were obtained. At these optimal values, the ground cover content in the thrown soil stream will be less than 15 %, the productivity of the forest fires soil-sweeping machine will be more than 40 kg/s, and the power consumption will be less than 12 kW.