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(to) degass - entgasen
extrusion direction - Extrusionsrichtung
polymer-melt - Polymerschmelze, Kunststoffschmelze
screw - Extruderschnecke
(to) extrude - extrudieren
outlet - Auslauf
heating sections - Heizzonen
temperature sensor - Temperatursensor
pressure sensor - Drucksensor
(to) process - verarbeiten
melt-filter - Schmelzefilter
surface area - Oberfläche
(to) purify - reinigen
pre-treated - vorbehandelt
thermoforming sheet - Tiefziehfolie
strapping tape - Verpackungsband

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https://www.gneuss.com/en/polymer-technologies/extrusion/mrs-extruder/

https://www.k-aktuell.de/technologie/gneuss-aktive-viskositaetssteuerung-bei-pet-extrusion-19549/

https://www.youtube.com/watch?v=6yi0ldmczGY

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To put it simple, the extruder is used for recycling polymer-melts.

This is most commonly achieved by combining it with a melt-filter. The extruder removes all the chemical contamination and the filter filters out mechanical impurities. The MRS-Extruder does not necessary need any pre-treated material to return food-grade material.

Some examples are:

bottle to bottle recycling

thermoforming sheet

strapping tape

PE/PP Recycling

PA degassing

MRS Mixing Technology

Direct recycling of fiber and film waste

Removal and recovery of caprolactam in nylon processing

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Each of the aforementioned sections consists of smaller heating sections with at least one heating element and a temperature sensor. These sections are seperately regulated by the temperature control to hold the desired temperature of the polymer melt.

In addition to that, pressure sensors are distributed along the extruder, which are important for safety reasons, but also for further processing e.g. melt-filters, because they require a certain minimal amount of melt-pressure to function.

The MRS-section is set under vacuum and due to the high surface area delivered by the satellite screws, volatiles can  efficiently and freely be evacuated. In that way the polymer-melt is chemically purified.

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Gneuss MRS Extruder for polymer recycling and devolatilization of plastic melts

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The Gneuss MRS 130 Extruder is used for efficient degassing and extrusion of polymer melts.
The Extruder ist seperated in 3 sections, which are lined up in extrusion direction (left to right in the picture).

The first section is the entry screw, which feeds the extruder with material supplied in the hopper (top left in the picture).

The second section is called the MRS-section, which is special to gneuss extruders.  In this area the polymer melt is delivered into a large single screw drum. The drum contains 8 small extruder barrels, parallel to the main screw axis, in which smaller rotating "satellite" screws continue extruding the melt.

The third section ist the outlet screw, in which the melt is pressurized to use it for further applications.

(see the video for further visualization)