ROTARY FILTRATION |
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From the outset, the company’s main objective to provide superior quality products has been realized by applying advanced manufacturing technology. A large part of the earnings is reinvested in R&D and latest technology machinery. We pioneered new materials and coating technologies to achieve a rotary filtration system that simply is unmatched. Integrated microprocessor controls provide reliable operation, simplified maintenance, and computer interface. The more thought and technology that goes into the selection, composition and construction of a screen pack, the better and more efficient the rotary filtration process. Regardless of the method chosen to replace or renew the screen pack, it, the screen pack, is the very heart of the polymer rotary filtration process. When the screen pack is properly designed and installed, it will probably do an excellent job of removing particulate. |
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Unfortunately, this is where the real problems begin. Already mentioned above are some of the problems associated with blocking and clogging filters. If the problems cause the process to go out of control then the solution is to renew the screen pack, or filtration media, before control is lost. Some schools of thought believe that increasing the area of rotary filtration is the answer. Variations of the prefill idea can be found on some rotary filtration units which use a bifurcated melt flow channel to partly introduce a fresh screen pack into the melt flow while retaining a corresponding part of the active screen pack in the melt flow. Bifurcating the melt flow channel is an idea used by a few manufacturers. Splitting the melt flow allows for a continuous flow of polymer while screen packs are shifted from one flow path to the other. |
The controls range from simple proprietary PLCs to dedicated microprocessors performing multi functional operations. The logic used to control rotary filtration is to interrogate pressure transducers and compare pressure readings to setpoints. The readings can be upstream of the screenchanger, downstream of the screenchanger or Delta P. |
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