Processing Magazine

Economical regrind and powder feeders for large blenders

January 26, 2009

A leading manufacturer of auxiliary equipment and systems for the plastic processing industry, has now incorporated regrind and powder feeders for use on all sizes of its line of gravimetric batch blending systems. The feeders are both auger type for use with difficult-to-flow sheet regrind and ground-up scrap from sprews of off-spec parts, or a wide range of difficult to feed, powder materials. In most sheets, in-line thermoforming, and molding applications, customers need the capability of feeding up to 50 percent or more of ground-scrap back into the process. By “re-feeding” this material back through a Guardian® gravimetric blending system, the amount of scrap can be controlled and recorded. Conventional gate-feeder designs can jam and bridge over, resulting in feeding inconsistencies that affect system accuracy and performance. Through extensive research and testing, Process Control engineers have optimized the design of the regrind feeder auger to prevent these and other problems that lead to costly process interruptions. By incorporating the popular PF Series powder feeders into the complete line of Guardian® blenders, one or two powder materials can be blended with standard pellets and/or regrind materials at a very economical price. These specialty feeders are available on all blender sizes for throughputs of up to 9600 PPH and 12 components per blender, and they are available with a variety of auger/gear motor combinations to accommodate a very wide range of materials and blend ratios.