Single and Twin Screw Flexible Walled Feeder is suitable for dosing powders, pellets, granulates, regrinds, fibres and flakes in both continuous and batching processes. The Feeder is fitted with removable flexible hopper that enables the user to clean and change materials in less than one minute. The Flexible Walled Feeder comprises of single and twin screw hoppers that are interchangeable, allowing the user to configure the feeder for nearly any type of material in a matter of minutes. Single and Twin Screw Flexible Walled Feeder can be integrated into both gravimetric and volumetric systems.