machinery | Pelletisers
Right: The BP50 strand pelletiser for lab and light duties is now available
ex-stock from Bay Plastics Machinery
freezing of the melt in the die holes. It says the system is based on highly efficient thermal separation between the nozzles and the die plate, which is in direct contact with the cooling water. The company says that variations in temperature
between process water and melt may lead to freezing of some or all extrusion strand and this risk is particularly high when producing micro-pellets because of the small die holes (diameters are typically in the range of 0.4mm to 0.8 mm). To overcome this, the ECON system provides constructional decoupling of individual nozzles and die plate so the contact surface between the hot nozzles and the cool die plate is reduced to a minimum. “We are also working on pelletisers for bio-poly-
mers,” says Neumann. “Pelletising of bio-polymers will work with or without process water and that is the reason for using hybrid systems. These can work as an underwater or air pelletiser employing a hot die face cutter and have a production rate of 1-1000 kg/h. Rapid changeover between systems also increases productiv- ity. We are also developing pelletisers for engineering plastics, such as PEEK, because production volumes of these materials are increasing.” ECON has also developed a full range of equipment for
laboratories, including pelletisers, classifiers and pyrolysis furnaces. This laboratory range includes the EUP 10 underwater pelletiser, with a compact design and space requirement of less than 2m². Like ECON’s larger underwater pelletising systems, the EUP 10 is equipped with thermal insulation technology at the die plate, preventing freezing of the die holes. Also developed for the laboratory, the EWA 10 is a hybrid machine that can be switched from air to underwater pelletising in minutes. The pelletiser housing is designed either for connection to a conveyor fan and cyclone or water system. Coperion has introduced the UG 750W underwater
pelletiser to offer increased wear protection in medium capacity applications. Designed for producing polyole- fins and capable of achieving throughputs of 60-70 tonnes/h, the pelletiser’s large die plate is manufac- tured from a newly developed material that is highly resistant to both abrasion and corrosion and is said to be able to double service life. The company says the UG 750W pelletiser bridges the gap in capacity between the UG 750 with its maximum throughput of 55 tonnes/h (widely used in PE applications) and the larger UG 1000 for throughputs of up to 82 tonnes/h. Based on the UG 750, the new pelletiser is equipped with the die plate/blade system from the UG 1000 and blade shaft bearing, pelletiser hood and drive train of the UG 750. Due to the wider cutting circle and an optimised arrangement of die holes, Coperion says that it has been possible to increase the number of holes in comparison with the UG 750 by around 27% to more than 5,700. Because it makes use of products from its existing range, Coperion says that the UG 750W offers users that already have a UG 750 pelletiser the option of achieving a distinct increase in pelletiser throughput through the replacement of a small number of components. The UG 750W’s large die plate is produced from
Right: Developed for the laboratory, the EWA 10 from ECON is a hybrid machine that can be switched from air to underwater pelletising in minutes
NikroDur, a wear protection material that Coperion has jointly developed with DEW Deutsche Edel- stahlwerke. In comparison with conventional ferro-titanite, the company says this metal matrix composite produced by powder metallurgy has at
least 50% higher wear resistance combined with more than one-third higher corrosion resistance. The material’s one-fifth lower thermal conductivity optimises plate temperature management and the
cutability of even low viscosity melts. In addition, NikroDur’s thermal expansion properties, which match
44 COMPOUNDING WORLD | January 2017
www.compoundingworld.com
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