machinery | Multi-screw extruders Right: A
ZSE-200-250 planetary
roller extruder from Batten-
feld-Cincinnati. This two-stage arrangement is said to enable very effi cient degassing
for highly effi cient degassing of the melt and another short fi nal single screw zone to build up melt pressure for transfer to the melt pump and die. Models are available with outputs from 600kg to 1,200kg per hour. Typical applications include processing of PET fl ake without pre-drying.
Screws within screws Battenfeld-Cincinnati’s STARextruder appears vaguely similar to the MRS (Multi Rotation System ) from Gneuss Kunststofftechnik of Germany, which is also used for processing PET fl ake, but there are actually some fundamental differences. Although the MRS has two single-screw sections before and after a planetary screw section, its eight planetary screws are located in slots on the central screw, which in this section has a larger diameter than the fi rst and last sections. The planetary screws, driven by a ring gear, rotate around their own axes in the opposite direction to the main screw. The reason for this, according to Project Manager Andrew Prangnell , is that the more open lay-out is much better at allowing volatiles to escape. Gneuss is currently fl agging the use of the MRS in
production of masterbatches containing nano particles. Prangnell says its development team has already used the system to create compounds based on PC, PET and
The MRS
extruder from Gneuss is fi nding
application in processing of nanoparticle
masterbatches
PP with several different additives introduced into the polymer as emulsions or in suspension. “The additives are mixed with the polymer so that they harmonise with them by connecting to the molecular structure of the polymer, leaving no agglomerates,” he says. “The high proportion of particles under 10nm results in drastically improved properties such as electrical and thermal conductivity, abrasive properties and fl ow characteristics.” The system takes the form of a cascade. In the fi rst
step, the additives in a liquid suspension are fed into a twin screw extruder. In a second stage, the carrier suspension is extracted in the MRS, leaving the additives behind in the polymer. The MRS also ensures further intensive but gentle uniform distribution of the additives in the polymer.
Click on the links for more information:
www.keimei.de
www.technovel.co.jp
www.extricom.de
www.entex.de
www.takimsan.com
www.battenfeld-cincinnati.com
www.gneuss.de
Meet us at K-Show 2016! Booth A44/48, Hall 9
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EXTRAORDINARY TECHNOLOGIES FOR TODAY‘S PLASTICS
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