ADG Solutions of Fairfield, Conn., introduced self-cleaning screen changers, ram stuffer technology and other reclaim innovations at NPE 2015.
The new screen changer is the Fimic model APR 500, which ADG said is ideal for contaminated reclaim extrusion streams, the melt-filtration unit is positioned at the extruder outlet, so it retains contaminants as small as 140 microns, or about the size of fine beach sand. As contamination builds up on the upstream side of the screen, inlet pressure increases to a set point, triggering a scraper that removes the material from the face of the screen filter.
According to ADG, most self-cleaning screen changers channel some polymer melt to purge the contamination from the screen through a discharge valve. But over time, the company said, this can waste significant amounts of resin. The new Fimic units, however, store the contaminants from up to six scrapings and discharge all the accumulated contamination at once.
Other innovations include new laser-cut screen plates that ensure very long life. With a large open area, back pressure is minimized even at file filtration levels. A continuous-scraping mode is available to prevent pressure instability, by immediately removing contaminants.
In other news from NPE, AGD displayed Davis-Standard ram stuffers that can be added to an extruder to handle a wide range of feedstock sizes and types. The super-size feed throat maximizes in-feed for a consistently high extruder output, even when running low-bulk-density scrap material such as fractional-gauge films.
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