Smart Molding International 3-2022

46 peripherals & automation smart_molding international 3/2022 G els were not on rPlanet Earth’s radar when the vertically inte- grated rPET processor started up their 300,000+ square foot plant in 2018. Being an “advanced tech- nology company” rPlanet initially fo- cused its efforts on state-of-the-art automation to sort post-consumer materials and all of the other details that must be considered when start- ing up a new plant. rPlanet Earth’s operation in Vernon, California is special because they do not simply convert bottles to flake or pellets for resale like most rPET recyclers. They convert the flake directly to extruded sheet to make thermo- formed parts and injection mold bot- tle preforms under one roof making their carbon footprint very low. While gels can be caused by a va- riety of factors, dust and other fine contaminates are often a primary cause. Recycled bottle flake is noto- riously dusty because of the damage caused by grinding containers into a flake, decontamination and the nu- merous material handling and con- veyance steps between the baled post-consumer bottles and the extru- sion or injection molding machine. After discovering that gels were creating quality issues, rPlanet Earth decided to do something about it and contacted Pelletron Corporation in Lancaster, Pennsylvania. Pelletron specializes in gentle pneumatic con- veying and DeDuster® systems for the plastic processing and plastic produc- tion industries. They were already very familiar with rPlanet Earth’s operation since they supplied all the material handling systems from the wash line to the extruder and injection molding machines. Their DeDuster® systems use an electro- magnetic flux field coil to disturb the fine dust that is stuck to the flake due to static electricity and counterflow air to separate dust and streamers from the flake. Pelletron’s DeDuster® systems can lower the dust content from over 2,000 ppm concentration of particles between 0-500 micron particle size to less than 200 ppm. Other dust removal systems on the market cannot achieve that level of separation in a package as compact as the DeDuster®. rPlanet Earth purchased an XP45 DeDuster® for 2 mt/hr of rPET flake for each of their 3 Welex sheet extrud- ers. The low stack-up height of the DeDuster® made it possible to fit the DeDuster® directly on the extruder’s inlets below the loss-in-weight feed- ers. Pelletron supplied the equipment and controls while rPlanet handled the electrical and mechanical installation. The incidence of gels diminished after the DeDuster® systems were commis- sioned on the sheet extrusion lines. In a controlled study performed on one line, up to an average of 1.00 gels per 1 m of sheet (0.2-1.0 mm²) were counted when the DeDuster® was not running. That count made the sheet off spec for their most fussy custom- ers. Simply turning on the DeDuster® system reduced the gel count to an average of 0.17 gels per 1 m of sheet for the same gel size range. That was on spec so the material could be sold at prime rate. Pelletron’s DeDuster® systems are available in capacities that range from 50 lb/hr (20 kg/hr) up to 330,000 lb/ hr (150 mt/hr) and they offer free-of- charge testing to prove how well the DeDuster® can clean your material. Contact a Pelletron sales engineer to learn more. Pelletron www.pelletroncorp.com Pelletron DeDuster® solves gel problem for rPET processor DeDuster® systems use an electromagnetic flux field coil to disturb the fine dust that is stuck to the flake due to static electricity and counterflow air to separate dust and streamers from the flake. They can lower the dust content from over 2,000 ppm concentration of particles between 0-500 micron particle size to less than 200 ppm. XP-series DeDuster® — the standard for plastics manufacturers and compounders (picture: Pelletron)