Sokolskyi O. Scientific basis development of equipment and polymers processes by extrusion

Algorithms and methods of numerical calculations are proposed, which make it possible to analyze the flow distribution of polymeric materials in the molding channels of polymeric equipment with deformable walls. The obtained data allow us to predict the magnitude and nature of deformation of the molding elements and to take into account its effect on the equality of the formed product. Conducted refined numerical experiments allowed us to formulate recommendations for developers of equipment. A method of modeling and design of extrusion dies, which allows to determine the necessary configuration of the extrusion die and in particular its outlet to achieve the desired shape of the section of the extrudate after its stabilization is offered. The distribution of technological stresses along the length of the pipe under different modes of the cooling process was obtained. The result of the calculations made it possible to establish that the highest stresses occur under the conditions of bilateral cooling of water, which can lead to a deterioration of the quality of the pipe. Methods of experimental investigations of the regularities of the processes of feeding the extruder with a granular polymer, melting, extending the extrudate after its exit from the forming tool have been developed. Experimental settings have been created. Studies have been carried out to determine the physical properties of different polymeric materials at different stages of the extrusion process. The developed and patented installations for the study of the coefficients of friction and lateral pressure of granular materials, the main structural elements of the extruders, design proposals for the improvement of the structures of the extrusion dies and methods of their design are presented.