MACHINERY | MELT FILTRATION
the amount of melt flowing into the cavity. The piston then moves forward in smaller steps to ensure the melt is gradually withdrawn from the production flow. Nordson says its BKG filtration systems ensure
that melt is clean – being particularly useful when incorporating recycled content – and help to create a uniform, high-quality end product. As well as constant pressure, it is also important
to control flow rate – and this can be achieved using a product like a BKG EP extrusion pump. These deliver constant, reliable pressure, to provide a well-metered flow rate. The pumps help to reduce pressure fluctuations and balance out dosing and pulsing issues by the extruder.
Below: Erema’s new 406 laser filter has a 50% larger screen- ing area, to reduce pressure and temperature
Recycling systems Maag says that its recycling systems help users to remove heavy contaminants such as paper, aluminium and wood to produce reusable pellets. The systems are co-ordinated to each other and can be operated via the company’s proprietary control system. Modern recycling systems must be able to handle feedstock of varying quality grades. Maag says its EX125-6 recycling pump provides precise, uniform pressure for downstream filtration over a wide range of feedstock inputs. At the heart of Maag recycling systems is the
Ettlinger recycling melt filter, which runs continu- ously at high performance, it says. Melt with contamination content of 16% and particle sizes up to 4mm can be pumped into the filter for removal and discharge. The Eco 1000 achieves throughputs up to 10,000 kg/h depending on filter fineness ranging from 60 to 1800 microns. Both the ERF and Eco series are capable of filtering almost any polymer used in recycling operations, says Maag. All Ettlinger recycling melt filters operate continuously, keeping the volume and pressure of the melt stream constant. This avoids increasing extruder speed, and as a result, cuts energy consumption by as much as 30%.
Laser precision
Erema presented several new recycling systems and components
at K2022 – including a new laser filter. The 50% increase in the screen area of the
Erema 406 laser filter helps to ensure lower pressure and temperature at the same throughput rate, says the company. “This allows even finer screens to be used – for even better results – in quality-intensive
36 PIPE & PROFILE EXTRUSION | January/February 2023
Real time oil quality sensor and data collection and monitor from US company Early Warning Technologies
Oil monitoring unit to protect gearboxes
Process + Filtration Products in the USA pro- vides technologies for filtration of polymers, water and oil. It sells Rajhans Plastics Machinery RJC and RJSC dual-channel screen changers, made in India. The company, headed by Bob Vogel, also has a business called Early Warning Technologies (EWT), which offers sensor-based technologies and a dedicated alarm and monitoring system to provide alerts of potential failure of engines and equipment using lubricating or hydraulic oils. He says one of the key factors in proper perfor-
mance of gearboxes is maintaining the protective qualities of the lubricating oil. Oil will, over time, lose its lubricating protective qualities. This will be as a result of being subjected to excessive heat, the effects of shear, contamination by dirt and water or particulates. The deterioration of the oil will eventually cause gear components, seals and other parts of the gear box to wear requiring maintenance or replacement. EWT’s oil monitoring program incorporates an oil quality sensor and Express Monitor technol- ogy developed by Tan Delta Systems to provide continuous monitoring of the oil by sampling it every 60 milliseconds with a sensitivity of 15 ppm. The real time data collection and analysis will
indicate trends and sources of accelerated oil degeneration, pinpointing the exact time and its nature. Sensor data is captured and displayed in a traffic light format for an immediate visualisa- tion of the oil condition. The monitor also shows the TD Number index, representing oil quality values from new to end-of-life, rate of change and temperature. EWT’s technology group provides support in data interpretation and identifying potential sources of oil degeneration.
www.pipeandprofile.com
IMAGE: EWT
IMAGE: EREMA
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