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MRS Extrusion Concept
The patented MRS Multi Rotation System offers completely new possibilities with
regard to the efficient degassing and extrusion of polymer melts. Additionally,
this system also offers excellent dispersion performance for the introduction of
gases and / or all forms of additives.
The polymer melt is delivered into a large single
screw drum. The drum contains 8 small extruder
barrels, parallel to the main screw axis. Installed
in these small extruder barrels are the "satellite"
screws, which are driven by a ring gear in the main
The satellite screws rotate in the opposite direction
to the main screw while they rotate around the
This disproportionately increases the surface exchange of the polymer melt. The extruder barrels
which are cut into the drum of the multi rotation
system are approximately 30% open (see illustrations 4 and 5) to ensure the optimum melt transfer
into the barrels, so that the evacuation can take
place without restrictions.
Further, precise control of the melt temperature is
possible as the temperatures of all the surfaces in
contact with the melt can be controlled accurately.
Thanks to the multi rotation elements, a melt
surface area is made available which is far greater
than that of conventional extruders. For example: the MRS system creates a melt surface
area which is 25 times greater compared with a
corotating twin screw extruder.
The specific energy requirement of the MRS system
is typically 15 to 25 % less than for conventional
technologies as it needs neither pre-drying nor
powerful vacuum systems. Compared with the single
screw extruder when processing PET, pre-treatment
of the material in the form of drying and crystallizing
can be avoided thereby saving operating and main-
tenance costs along with energy savings. The MRS also has a lower energy consumption when compared with corotating twin screw extruders. In the case
of PET processing, there are additional savings with
the MRS as this system requires neither a powerful
vacuum system ( < 5 mbar) nor partial pre-drying of
the material. Furthermore, the MRS delivers suffici-
ent pressure that in most cases, a melt pump is not
necessary to boost the pressure.
Typical MRS Extrusion Applications(examples):
Bottle to bottle recycling
MRS Mixing Technology
Direct recycling of fiber und film waste