POST-INDUSTRIAL RECYCLING | TECHNOLOGY
recyclers for decades. It is simple to clean and maintain and supports lower costs upfront and during operation. Secondly, it has the versatility to handle a wide range of materials from fluff to pellet without changes to the machine itself. Processors can decouple the shredding and extrusion opera- tions to provide greater flexibility during downtime. If another component of the line unexpectedly shuts down, the machine can be easily restarted without a lengthy cleanout process. In addition to the Ram-Stuffer, the company has other options for the direct utilisation of reclaimed film material in sheet extrusion. Selecting the right extruder and roll stand is key to this process because bulk density/weight and free flow versus non-free flow (materials move with or without assistance) must be considered. Selection of the right extruder is according to material characteris- tics, as well as filtration options based on contami- nation levels of the reclaimed material. Roll stand capabilities to support material type, thickness, width, and outputs required for the application are also all-important factors. Most reclaimed films are light bulk density
materials, which are well suited for the Ram-Stuffer. “However, there are also scrapper-extruder models, wide-mouth models and co-rotating twin-screw models that can be considered depending on the application,” says Hanna. “Equally vital in terms of sheet is roll stand selection. A vertical downstack arrangement offers a conventional arrangement and horizontal die-to-nip approach for smooth sheet processing. A vertical J/upstack arrangement has an angled die-to-nip, which works better on low melt-strength resins. This arrangement is often
used for both embossed and smooth sheets. For thinner gauge sheet products, a horizontal roll stand may be the way to go. You also have options for customisation of rolls and other features with upstack, downstack and horizontal configurations, based on resin and sheet characteristics.” He continues: “Direct reclaim sheet extrusion
also requires the use of filtration systems and melt pumps to optimise processing. There are different levels of filtration depending on material contami- nation, and a melt pump is essential to reduce output pressure variability to the downstream feed block and die. Another piece of equipment to consider in direct reclaim sheet extrusion is the compactor. Compactors enable recycling and compounding of low bulk density materials with high residual moisture.” Davis-Standard adds that it works with industry
leaders in filtration and pelletising to assemble a system that will be most effective based on the application. This flexible approach allows a comprehensive solution to specific recycling challenges. The company also has a broad library of laboratory data and in-house feedscrew design and manufacturing. Recent developments at Davis-Standard include
the DS Activ-Check, which allows customers to implement condition-monitoring features that enable preventative maintenance and reduce unplanned downtime. DS Activ-Check is a cloud- based platform for improving extrusion line productivity by taking advantage of the IIoT (Industrial Internet of Things), cloud computing and real-time analytics. The system uses analytical tools based on live-streaming and/or long-term cloud
Real Recycling Once is Never Enough
With our innovative recycling and processing technologies, even the most heavily contaminated polymer waste can be recycled. But not simply recycled: reprocessed to consistently high quality products for demanding applications, even after repeated processing cycles.
Good for the environment and good for your business.
We are specialists both for individually engineered retrofit packages for upgrading your recycling extrusion equipment - and also for complete, turn-key lines. More information at
www.gneuss.com
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