Russian Journal of Applied Chemistry, 2012, Vol. 85, No. 9, pp. 1475−1481.
Pleiades Publishing, Ltd., 2012.
Original Russian Text
I.O. Mikulionok, L.B. Radchenko, 2012, published in Khimicheskaya Promyshlennost’, 2012, Vol. 89, No. 1, pp. 31−38.
PROCESSES AND DEVICES
OF CHEMICAL MANUFACTURES
Simulation of Disk Extruder Operation
I. O. Mikulionok and L. B. Radchenko
National Technical University of Ukraine "Kyiv Polytechnic Institute," Kyiv, Ukraine
Received December 22, 2011
Abstract—Mathematical simulation of thermoplastic polymer processing by a disk extruder was considered.
The results were compared with experimental data obtained in an extruder of a 200 mm diameter. The developed
technique of calculation allows selection of design parameters of operational parts and disk speed for preset output
of the disk extruder as well as energy-power parameters of extrusion.
An increase in output and diversiﬁ cation of polymers
and plastics require designing of efﬁ cient devices for
their processing. Fairly universal constructions of disk
and combined screw-disk extruders were developed
together with applying in industry single and twin screw
extruders of various sizes and purposes [1–4].
Despite relatively low operating pressure the
disk extruders possess advantages in comparison
with the screw extruders: high efﬁ ciency of mixing,
short processing time of material in extruder, simpler
construction, and less material and power consumption.
Therewith pressure at an outlet of the disk extruder
can be improved, e.g., with the aid of a gear pump.
Especially effectively the disk extruders can be applied
in technological schemes of polymer granulating (also
including secondary polymers), and also in a stage of
obtaining a melt in cascade schemes in production of
ﬁ lled compositions. These extruders are fairly versatile
since allow processing of various polymers and
compositions without changes in the construction.
In one of the most effective designs of the disk
extruders [2, 3] polymer by a feeder or directly from the
hopper (no dosing) goes into the charging inlet of a body
and by multiple screw thread made on the cylindrical
surface of the rotor, is conveyed to the disk gap formed
by motionless body and disk. Pre-melting of polymer
occurs in a channel of the disk screw thread, and ﬁ nal
melting and homogenization of the melt, in the disk
gap. Afterward the prepared melt exits through a central
outlet of the body (Fig. 1).
The dosing of the polymer in the extruder caters for
effective governing the process of preparation of the
melt and its quality at the preset output by changing the
disk speed and the size of the disk gap.
Mathematical modeling and experimental
investigation of the disk extrusion of thermoplastics
Fig. 1. Scheme of the disk extruder: (1) feeding inlet; (2)
body; (3) disk; (4) disk gap; (5) central outlet of the body; (D,
) diameters of cylindrical and end parts of the disk, and
also of the central outlet of the body, respectively, m; (L
, b, h
length, width, and depth of the screw thread of the cylindrical
part of the disk, m; (h) size of the disk gap, m; (φ
) angle of
taper of the end part of disk, deg.