MACHINERY | MELT FILTRATION
has continually evolved its machinery for recycling processes. “The peak of this development has been the BKG HiCon V-Type system with the FlexDisc,” says the company. “The melt filter is uniquely capable of pressure-constant operation, and the BKG FlexDisc enlarges the available filtration area significantly, allowing higher through- puts with fewer screen changes.” The melt pressure-controlled venting start is another feature of the BKG HiCon V-Type. This helps operators automate and stabilise their process, especially the operating pressure, the company says.
Changing the screen is obviously a critical step in the filtration process. On piston-type screen changers like the HiCon V-Type, when the piston moves out of the housing, air gets into the cavity, and this needs to be vented. The air is displaced by the melt flooding into the cavity once the piston moves back into the housing. Filling the cavity too quickly can result in pressure fluctuations, which can be a major problem in film and sheet lines, causing breakages, thins spots, and fisheyes. Nordson says that on its filters, the piston design allows a controlled melt inflow, preventing such fluctuations. “The melt pressure controlled venting start takes
the control of the melt inflow to another level,” says the company. Customers can determine a maxi- mum allowed pressure drop according to the processed material and the end product require- ments. Pressure is monitored closely as the cavity fills up, and if it drops beneath the allowed value, the piston moves back, reducing flow. It then moves forward in smaller steps to ensure the melt is withdrawn from the production flow sensitively. “Tying the filling of the cavity to the operating
pressure reduces the amount of operator interven- tion, improves the process stability, and overall improves the quality of the final product,” says Nordson BKG.
With the constantly rising demands on recycled product quality, pressure consistency
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 provides 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
IMAGE:
NORDSON BKG
Above: BKG HiCon V-Type system with the FlexDisc
22 PLASTICS RECYCLING WORLD | March/April 2022
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.plasticsrecyclingworld.com
IMAGE: EWT
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