Improvement of extrusion equipment and technologies for processing secondary combined polymer materials and mixtures

Abstract

The article is devoted to the solution of scientific and technical problem of perfecting the extrusion equipment and technology for processing secondary combined polymeric materials and polymeric mixtures including wastes, by the method of extrusion with use of multi-section screw that allows to manufacture new high-quality products and reduce the environment pollution. A new screw design is proposed consisting of several functional sections. A mathematical model for operation of the extruder with the multi-section screw has been developed to analyse the operation parameters and produce new designs of the extruder screw. Based on the studies of the functional purpose of the extruder zones and features of processing the polymeric mixtures with secondary raw materials, a functional diagram of the screw is proposed. The thickness values of the strips of the polymer mixture components at the outlet of the extruder sections for analysing the mixing capacities have been obtained. It has been established that the extruder with the multi-section screw can be used with effective combination of two stages: mixing and basic processing. With the help of mathematical modelling the diagrams of linear velocities and shear rates for each extruder section have been obtained.