What is Nauta dryer?

The Nauta® conical screw vacuum dryer is a universal batch dryer suitable for drying materials such as powders, granules, pastes and viscous slurries, especially when products are heat sensitive, contain solvents and are toxic or explosive.

What is the vacuum dryer suitable for?

Vacuum dryer can be used to dry heat sensitive hygroscopic and toxic materials. To improve quality of products, such as for fruit preservation, hybrid drying combining osmotic dehydration followed by heat pump drying and microwave-vacuum drying proved effective.

What is agitated vacuum dryer?

Vacuum drying is one of the most efficient forms of material drying known. A typical batch-operated vacuum agitated dryer consists of an enclosed drying chamber connected through a condenser to a vacuum system. Steam or another heat-transfer fluid is piped to a jacket surrounding the chamber.

How does a Nauta mixer work?

The Nauta conical screw mixer is a convective mixer with high mixing efficiency. The mixing screw is suspended from an orbital arm, which rotates the mixing screw along the conical inner vessel wall causing convective mixing of particles and shear.

What is a ribbon mixer?

The Ribbon or Agitator Type A ribbon mixer successfully mixes materials by agitating them with a corkscrew-like metal blade. The outer helix of the ribbon moves product in one direction, while the inner helix of the ribbon moves the material in the opposite direction.

Is vacuum drying the same as freeze drying?

Vacuum/Freeze-Drying Sometimes called “Freeze-Drying,” though technically that is a different, less successful freezing process without use of a vacuum.

Does vacuum remove moisture?

A vacuum pump removes air and moisture from the system before the system is damaged. At that pressure, the moisture readily changes into a vapor, which a pump removes. The deeper and more complete the vacuum, the more moisture is removed from the system.

How does a rotary dryer work?

Rotary dryers work by tumbling material in a rotating drum in the presence of a drying air. As the drum rotates, lifting flights pick up the material and drop it through the air stream in order to maximize heat transfer efficiency.

How do you obtain the rate of drying curve for a given drying operation?

The following equation is used to calculate rate of drying: Rate of drying = weight of water removed/weight of dry powder*time of drying * surface area exposed. A graph is plotted by taking FMC on x-axis and drying rate on y-axis. The curve so obtained is called as drying rate curve.

What is the difference between tray dryer and vacuum tray dryer?

A vacuum tray dryer is primarily used to dry high-quality, temperature-sensitive, and oxygen-sensitive items. A vacuum dryer is shaped like a box into which trays are loaded and unloaded through a door with a vacuum seal around the edges, similar to a regular tray drier.

What are the disadvantages of tray dryer?

Disadvantages of Tray Dryer: