The Vrieco-Nauta® Conical Screw Mixer is a batch mixer specially designed for segregative, free-flowing powders and pastes. The Vrieco-Nauta® Conical Screw Mixers is famous for its low-intensity mixing and is a pioneer in mixing technology. It especially suited to delicate products and processes where very accurate results are required and is synonymous with gentle mixing of large volumes of up to 100,000 liters.
The basic design consists of a cylindrical screw located at the vessel wall that conveys product from the bottom of the conical vessel to the product surface. The screw is attached to an arm which rotates around the perimeter of the vessel causing convective mixing and shear. The particles at the surface opposite the screw accelerate downward in a mass flow by gravity as the diameter of the vessel decreases. The three actions result in a unique three dimensional mixing action.