The Coperion K-Tron ActiFlow system is a patented material flow aid that can be combined with the Coperion K-Tron line of loss in weight feeders when feeding difficult flowing ingredients direct to the pet food mixer or extruder. This device prevents bridging or rat-holing of cohesive bulk materials in hoppers. ActiFlow is a non-product contact device, consisting of a patent-pending vibratory drive and intelligent control unit. In applications involving difficult flowing materials, ActiFlow eliminates the need for mechanical agitators with secondary motors and gearboxes, as well as the need for flexible side wall agitation devices or aeration pads. ActiFlow greatly simplifies the cleaning process during material change-over and reduces headroom requirements. The device is bolted to the outside of the extension hopper, above the feed screws.