martino communications
about the agency
client portraits
client list


home > news > details


Cutaway View

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

MÜNSTER, GERMANY, March 11, 2019: 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.

Screen changers equipped with Nordson’s backflush technology include the BKG® V-Type 3G and BKG® HiCon™ K-SWE-4K-75/RS. Backflushing diverts the contaminant from the melt stream. The greater filtration efficiency of the new FlexDisc reduces the frequency of backflushing and thus the amount of specific backflush volume.

As melt enters the filter stack from the upstream side, it is evenly distributed among the FlexDiscs, which are rheologically optimized to provide efficient filtration with minimal shear stress. At the same time, the structural integrity of the FlexDisc design enables it to withstand pressure differentials up to 130 bar (1,900 psi) during the backflush procedure.

“The substantially increased filtration efficiency of the FlexDisc can enable the processor or recycler to save on investment cost by purchasing a smaller machine without sacrificing throughput,” said Christian Schröder, Global Product Manager at Nordson. “There are also significant operational savings possible with the reduction of specific backflush volume.”


Nordson Corporation engineers, manufactures and markets differentiated products and systems used for the precision dispensing of adhesives, coatings, sealants, biomaterials, polymers, plastics and other materials, fluid management, test and inspection, UV curing and plasma surface treatment, all supported by application expertise and direct global sales and service. Nordson serves a wide variety of consumer non-durable, durable and technology end markets including packaging, nonwovens, electronics, medical, appliances, energy, transportation, construction, and general product assembly and finishing. Founded in 1954 and headquartered in Westlake, Ohio, the company has operations and support offices in more than 30 countries. Visit Nordson on the web at, @Nordson_Corp, or

Nordson Polymer Processing Systems provides customers with engineered components to melt, homogenize, filter, meter, and give shape to plastic and fluid coating materials. Nordson Corporation leverages the collective plastics industry experience from a series of strategic acquisitions to offer a uniquely broad portfolio of industry-leading technologies. Nordson delivers a full range of precision melt stream products — from screws and barrels for extrusion and injection molding — to filtration systems, pumps, and valves — to the extrusion dies and pelletizing systems to meet the constantly evolving needs of the polymer industry.

Nordson Corporation provides customers with local technical sales, service and remanufacturing capabilities through sales organizations and regional manufacturing facilities in over 30 countries. To learn more visit us at or