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Reliable filtration – high-quality recycling  #1-2 (59-60) 2008

Kreyenborg GroupKreyenborg GmbH is known as technology and world market leader in plastics recycling. It supplies a number of various screen changers, which are exactly suitable for this process

The quality of melt filtration plays central role in the recycling process. Fully automatic backflush screen changers, elaborated by Kreyenborg are especially suitable for recycling.
These systems are featured by the fact that a selfcleaning of the screens takes place just during the operation: when a pre-defined pollution degree is reached, the backflushing automatically starts when the contaminations from the screen pack are led out of the machine via a spillway.
Perfect combination of components: screen changers and pumps from KreyenborgThanks to this technology the lifetime of the filter unit is enormously increased. Kreyenborg fully automatic backflush screen changers allow operating up to 100 backflushings until the screen pack has to be changed.
This kind of melt filters are especially actual for recycling applications, as with these process the rate of contaminations in the melt is rather high.
Pressure fluctuations, which occur during the recycling material filtration, are rather problematical. In principal these fluctuations may arise when a filter medium is changed or – to a minor degree – also during the backflush, as the filtration area, which has to be changed or rinsed, will be taken out of the process and put in again. Kreyenborg offers various screen changers enabling to avoid these problems. Thus pressure fluctuations are minimised by means of the 4-channel-technology and the screen cavities duplication.
With the V-Type screen changer Kreyenborg offers the system, which helps to forget about pressure fluctuations during the filtration. Owing to its efficiency this melt filter presents most effective up-to-date technology for melt filtration. It makes possible to process even extremely polluted material into the high-quality products for the most sensitive applications. At present this technology is predominantly used for PET recycling and opens for the producers the new conception of the recycling regarding its profitability and efficiency.
Normally in recycling applications melt filters are used together with gear pumps. They unload the extruder and stabilise the pressure at the tool. For years Kreyenborg pumps, which are world wide in operation, proved their value. These components are characterized by the compact design and enormous longevity. Due to high flexibility and numerous options the pumps may be adapted exactly to the particular specifications of material and processes.
Due to the great experience, Kreyenborg is known as a reliable partner for the recycling industry all over the world. In addition to the latest technology detailed advice and competent customer service are offered.

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