PROCESSING | MELT FILTRATION
“You mustn’t underestimate the fact that the daily screen change by the operator which is necessary with a piston screen changer is no longer required and this reduces the risk of operating error considerably.” Gneuss says that its Gneuss Processing Unit
Above: A Gneuss GPU with MRS extruder, melt filter, and viscometer
while the maximum level of contamination that can be handled by a piston filter lies between 0.05- 0.1%, the Laserfilter processes input material with a degree of contamination of more than 1%. This means greater flexibility in being able to handle increasing contaminated in post-consumer input material. “With the PET Laserfilter we are talking about screen life of five to twelve weeks,” Obermayr says.
(GPU), which was launched several years ago, is now a proven solution for the reprocessing of bulky PET waste such as post-consumer bottle flake and industrial waste from fibre and film manufacture without pre-drying. The GPU consists of a Gneuss MRS devolatilisation and decontamination extruder in combination with a Gneuss Rotary Filtration System and a VIS online viscometer for intelligent dynamic viscosity control. The MRS is now also running in polyolefin and polyamide applications and is also being tested on a range of other materials.
Also in the PET sector, Nordson demonstrated the gains available from optimised screenchanger design last year when it announced it had retrofit- ted a special version of its BKY Poly unit on a polymerisation line operated by Turkish resin and packaging products maker Köksan. The company had been using a standard version of the BKG Poly
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PHOTO: GNEUSS
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