A mathematical model of the flow of a viscous medium through a conical annulus of extruder with a dynamic matrix has been developed, which allows describing the velocity fields and pressure changes in the dynamic matrix with an accuracy of up to 20%. The structural and technological parameters of the process of dynamic molding of the extrudate melt were studied, which describe the dependence of pressure, swelling coefficient, product exit velocity from the forming channel on the moisture content of initial mixture, rotation frequency of the dynamic matrix, and the geometry of the forming channel. Identified rational modes of dynamic molding the extrudate melt: the initial moisture content of raw material – 22-26 %, the temperature of the product in pre-matrix zone - 410-415 K, the pressure in pre-matrix zone – 4.5 to 6.0 MPa, rotation frequency of the cone – 14,0-16,0 s-1, form of annulus of the matrix - conical tapering.
Volume 12 | Issue 6
Pages: 720-730
DOI: 10.5373/JARDCS/V12I6/S20201086