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.

  • Cantilevered Screw design (no bottom support)
  • Belt drive systems available for sanitary applications – no lubrication inside the vessel
  • Clean in place designs CIP/SIP
  • Designed for chemical, pharmaceutical, mineral & food

Applications:

  • Mixing and homogenization of powders, pastes and slurries
  • Granulation or agglomeration of powders
  • Addition or injection of liquids into dry powders
  • Reaction under vacuum or pressure conditions
  • Heating and cooling of powders
  • De-aeration or densification of powders
  • Homogenization of particle size and color

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.

These versatile batch mixers are unique in many ways. Their design provides for a very gentle mixing action with low horsepower consumption. The special mixing action ensures a very homogenous mixture and short mixing times. The conical vessel design allows a wide range of filling capacities and the mass flow characteristic design minimizes segregation upon discharge. Because there are no horizontal internal surfaces, products are completely discharged, minimizing product loss and providing for easy cleaning.

Vessels can be designed for overpressure and under pressure operating conditions and units can be supplied with a variety of accessories including liquid injection, product samplers, high intensity lump breakers, level and temperature probes, load cells for batch weighing and jackets for heating and cooling are some examples.

Description

These versatile batch mixers are unique in many ways. Their design provides for a very gentle mixing action with low horsepower consumption. The special mixing action ensures a very homogenous mixture and short mixing times. The conical vessel design allows a wide range of filling capacities and the mass flow characteristic design minimizes segregation upon discharge. Because there are no horizontal internal surfaces, products are completely discharged, minimizing product loss and providing for easy cleaning.

Vessels can be designed for overpressure and under pressure operating conditions and units can be supplied with a variety of accessories including liquid injection, product samplers, high intensity lump breakers, level and temperature probes, load cells for batch weighing and jackets for heating and cooling are some examples.

Materials

Resources

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