machinery | Pelletisers
Above: Nordson supplied BKG CrystallCut pelletising systems for a PET resin plant operated by Jiangyin Chengold Packaging Materials in China
and combinations of both, are among the key production trends at present. “In addition, the trend for big PET plants moving away from cylindrical strand pellets to spherical underwater pellets is ongoing,” he says. “Also, outside Europe, increasingly more small and mid-size machines for highly filled compounds such as PE/PP with up to 85% CaCO3
are being installed.”
Nordson BKG has developed its new Master-Line with optional, continuous process water filtration to meet these market demands. “The new Master-Line with Belt Filter offers big benefits to the operator of a compounding line, especially for highly filled com- pounds,” Asmuss says. “One of the big challenges for the production of those materials is the process water filtration, which was mainly done manually on smaller production lines. For materials generating a large amount of fines, this takes a lot of operator time that could be spent doing more important tasks. The new Master-Line with Belt Filter automatically removes all fines generated in the process with the endless, continuously operated and self-cleaning filter belt.” Nordson recently supplied its BKG CrystallCut
pelletising technology for a PET resin plant operated by Jiangyin Chengold Packaging Materials Co in Jiangsu Province, China. The system consists of 16 pelletisers which cut the material from four reactors, producing 3,750 tonnes/day of PET pellets. The company says that the CrystallCut process provides substantial energy savings in comparison with standard PET polymerisa- tion systems by using the thermal energy of the molten polymer in PET pelletising for subsequent crystallisa- tion (the systems deliver PET pellets to EcoSphere solid state polycondensation systems). Nordson BKG has also supplied 16 condensation
systems for the water recovered from the hot air in the process. These are expected to provide substantial additional savings through reduction in water filling. “In the new mega-scale plant to be operated by Jiangyin Chengold, we anticipate that the energy savings provided by the CrystallCut process in comparison with conventional PET polymerisation will be truly dramatic,” says Ralf Simon, Nordson BKG Managing Director. “As
40 COMPOUNDING WORLD | January 2017
part of the streamlined system engineered by Polym- etrix, our BKG equipment will help the new plant to achieve unprecedented levels of efficiency.” Future projects for Nordson BKG include the
combination of pelletising with the newly developed BKG HiCon R-Type melt filter for handling highly contaminated recycling material. Nordson says that this will strengthen its position in the recycling sector, offering integrated downstream solutions for any suitable extruder on the market. US-based Bay Plastics Machinery (BPM), which
manufactures pelletisers as well as conveyors, water baths, air knives and strand de-watering units, is stepping up its global sales activities. The company announced late last year the appointment of Roberto Atesini as European Sales Manager based in Italy and said it expects to have full representation in Germany early this year, as well as adding new representatives in India, Malaysia and Singapore. BPM’s latest developments include the introduction
of a patented technology to help combat “carryover”. This is said to be a relatively common pelletiser phenomenon where a small amount of cut pellets follow the rotor back around in the cutting process, resulting in some pellets being cut multiple times. Its carryover solution uses vacuum technology to remove pellets from the cutting chamber immediately. This increases process yield and reduces the amount of classifying that needs to be completed on the cut product. The technology is available for production use now
and can be retrofitted on most existing strand pelletis- ers. “There are some good applications for this new technology, and this has the potential to significantly increase material yields for companies struggling with carryover and fines,” says Dick Fetter, BPM’s VP of Technical Development. Other BPM developments include the EVAK vacuum
strand dryer. Unlike conventional air knives, which dry using pressurised air that risks damaging delicate strands, the EVAK dryer uses gentle negative air pressure to eliminate residual water. A vacuum comb on the dryer envelopes each strand in a vortex of air,
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