BKG? FlexDisc? filter stack. (Photo credit: Nordson)

Innovative filter

New filter device substantially boosts screen changer efficiency for finer filtration, greater throughput, longer filter life

1:16 min PET recycling systems
Westlake, Ohio, United States

Nordson’s BKG® FlexDisc provides producers of critical films and PET recyclers with far more filtration area than standard screens, without increase in machine size.

Piovan September

An innovative FlexDisc™ filter for piston-activated screen changers substantially enlarges available filtration area without the need to increase machine size, enabling processors and recyclers to achieve finer filtration, higher throughputs, longer filter service life, and reduced specific backflush volume.

Nordson Corporation recommends the BKG® FlexDisc™ for increasing productivity and enhancing quality in bottle-to-bottle PET recycling, PET fiber recycling, and battery separator film applications.

The function of the hydraulic pistons, with which many BKG screen changers are equipped, is to insert screen cavities into the melt stream for filtration and to remove them for cleaning or replacement. In systems where FlexDiscs are used, each cavity contains a filter stack comprised of two to four FlexDiscs, depending on machine size. Each FlexDisc is equipped with two Nordson screen packs. As a result, there is two to 4.5 times more filtration area available for each cavity with the new FlexDisc than with conventional standard round screens, and 25% additional area (on average) when compared to the former FlexDisc version. The actual increase is dependent on machine size.

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