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A new spin on vacuum degassing of polymer melts

By Chemical Engineering |

Gneuss Kunststofftechnik GmbH (Bad Oeynhausen, Germany; edlinks.chemengonline.com/6899-541) has developed a patented technology that significantly increases the surface exchange of molten polymers during vacuum degassing — a technique used to remove residual water and monomers during polymer processing. Compared with conventional twin-screw extruder systems, the Multi Rotation System (MRS) provides up to 300% more surface contact with the polymer melt, says marketing manager Cristel Gneuss. Polymer melt is fed to a large, single-screw drum of the MRS. The drum contains 8 or 10 (depending on the size) small extruder barrels (photo) aligned parallel to the main screw axis. Satellite screws, installed in these small extruder barrels, are driven by a ring gear on the main barrel causing them to rotate in the opposite direction of the main screw. As the polymer melt passes down the drum, it undergoes about 25 times more surface exchanges in the MRS compared to a similarly sized twin-screw extruder, says Gneuss. As a result, the system is able to completely remove water while increasing the intrinsic viscosity of PET within the evacuation section of the MRS, says the company. The MRS will be launched to the world market at the K…
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