The influence of the disc zone of a screw-disc extruder on the structure and properties of low-density polyethylene (PE-LD) extrudate

Abstract

The article presents the results of analysis and research of the disc plasticizing mechanism operation on the mechanical, thermal, and structural properties of extruded material. The analysis of velocity distribution and trajectories of the material's displacement leads to a conclusion that the flow of polymer melt through the clearance between the discs arranges the supermolecular structure and in this way results in an extrudate with improved mechanical properties.

Marangoni convection in the transient flow of hybrid nanoliquid thin film over a radially stretching disk

“…In order to solve the coupled non-linear system (17) and (18) with the conditions given in (19), Runge-Kutta 4th order method in conjunction with shooting technique is employed. The first thing we do in this method is transform the differential equations ( 17) and (18) into a system of 1st order equations.…”

“…The first thing we do in this method is transform the differential equations ( 17) and (18) into a system of 1st order equations. For this purpose, following variables are introduced: By employing the above-mentioned substitutions in equations ( 17) and ( 18) as well as in the conditions given in (19), following system of ODEs or order one are obtained: along with the conditions:…”

“…One of the most obvious application is in the polymer extrusion process. It has been observed that the polymer extrusion, when carried over disks, results in an extrudate with better mechanical properties (Pozoga and Diakun 19 ). The predominant presence of liquid films have motivated researchers from decades to investigate the mechanics of thin film flows.…”

Analysis of Particles’ Size and Degree of Distribution of a Wooden Filler in Wood–Polymer Composites

“…The screw-disc extruder is a prototype construction, developed and made at the Faculty of Mechanical Engineering of the Koszalin University of Technology, described by I. Michalska-Pożoga and T. Rydzkowski [ 20 , 21 , 22 , 23 , 24 ].…”

“…The temperature of the hot zone was a constant parameter t = 160 • C. At the same time, the rotational speed of the screw (and the disc) n and the width of the disc chink W s were the variable factors (Table 2). The screw-disc extruder is a prototype construction, developed and made at the Faculty of Mechanical Engineering of the Koszalin University of Technology, described by I. Michalska-Po żoga and T. Rydzkowski [20][21][22][23][24].…”