Simulation of polyethylene macromolecules shifting in a disc zone of an extruder

Abstract

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

“…When an extruder operates at a clearance between the discs equal to W s = 3.0 mm, the distance between the points on the trajectories at the maximum point (D M ) can increase 13 times compared to the total length l C (column 3 of Table 1), and at the outlet -D E -it increases about 3 times compared to the total length l C (column 6 of Table 1). This is evidence of the disc's intensive interaction leading to the uncoiling of the polymer chain during its displacement in the disc zone [14].…”

“…These fluxes are perpendicular to each other and they create a displacement of the melt's particles in the clearance between the discs along spiral trajectories from the outside diameter towards the outlet (Fig. 3) [14,16].…”

“…The authors have already presented in their papers a model simulating the conditions of polymer chain stretching [14][15][16][17]. Table 1 presents the values of distance between trajectories with respect to the conformative (D M /l K ) and total length (D M /l C ) of the PE polymer chain, and the values of distance between two points of the trajectories on an outlet diameter with respect to the conformative (D E /l K ) and total length (D E /l C ).…”

“…If a polymer melt flows in a clearance between the discs, the particles of the melt are subjected to a tension (uncoiling the tangled polymer chain conformation), and then are recoiled in an area of a smaller diame-ter. This second stage -the recoiling of the polymer chains in an extruder clearance between the discs -is revealed as Weissenberg's effect [14].…”

“…The authors have implemented an innovative experimental screw-disc extruder (Fig. 1) designed by engineers 845 2014, , 59 nr 11-12 from their department: the diameter of the screw-disc was D = 130 mm and the length of the screw was L = 2D (screw working length L = 260 mm) [12][13][14]. The innovative extruder has a clearance between the movable face of the screw and the conical cover of the extruder.…”