Drying
Adopting energy-efficient drying technology, it enables continuous and automated production, ensuring excellent batch-to-batch consistency. It efficiently handles a wide variety of complex materials, including high-moisture, highly sticky, and heat-sensitive types, while providing precise control over powder moisture content and morphology.
Nauta Vacuum Dryer
The Nauta conical screw dryer is a highly versatile vacuum dryer designed for drying powders, granules, pastes and viscous slurries — especially when these products are heat-sensitive, contain solvents, or are toxic or explosive.
Principle of Operation
The Nauta conical screw dryer is a convective batch dryer with high thermal efficiency. A cantilevered (free-hanging), rotating screw conveys product from the bottom to the surface. Suspended from an orbiting arm, the screw moves along the conical vessel wall, generating axial and radial motion for efficient mixing.
Thermal energy is supplied via a heated jacket, which can be fed with steam, thermal oil or water. This enables rapid heat transfer into the product, enhanced by continuous mixing.
A vacuum environment lowers the boiling point of solvents and moisture, making the Nauta vacuum dryer ideal for heat-sensitive materials. Vapours are extracted through a dust filter at the top of the vessel, preventing product carryover into the vacuum system.
A condenser with solvent recovery tank is included and can be placed before or after the vacuum pump depending on solvent characteristics. The moisture content of the product can be controlled by monitoring the weight of the condensate or by using a Hosokawa Sampler to take samples from the product inside the dryer under vacuum.
Features
Multi-purpose and multi-processing conical screw dryer
Efficient batch drying from free-flowing powders to heavy pastes and viscous liquids
No segregation or product degradation
Interchangeable screw agitator for dryers > 20,000 L
Full compliance with industry standards including FDA, cGMP, EHEDG
Automated cleaning with our patented CIP solutions optional
Sterile processing (SIP) optional
Available in volumes from 5–22,000 L
Specifications
| Size (water filling) | Height | Width | Net volume (powder filling) | Jacket surface area | Max. evaporation water | Max. evaporation ethanol |
|---|---|---|---|---|---|---|
| 5 | 1420 | 600 | 4.3 | 0.13 | 1 | 3 |
| 80 | 2660 | 900 | 68 | 0.69 | 5 | 12.5 |
| 500 | 3920 | 1470 | 430 | 2.84 | 25 | 60 |
| 1000 | 4460 | 1720 | 840 | 4.58 | 35 | 85 |
| 5000 | 6840 | 2710 | 4500 | 13 | 100 | 250 |
| 12000 | 8450 | 3730 | 12000 | 25 | 190 | 400 |
| 22000 | 9950 | 4290 | 22000 | 33 | 250 | 600 |
experimental verification
Before investing in new equipment, please conduct tests on the materials to be used at the Hosokawa Testing and Process Development Center based on actual production conditions. Our experienced experts will assist you in determining the most effective mixing, granulation, or drying processes, helping you transition from laboratory testing to a comprehensive production testing phase. Whether you need to test the performance of a single machine or evaluate the entire production line, we can provide tailored testing services and process optimization solutions to ensure reliable system operation and excellent performance.
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