Freeze Dried Coffee,India price supplier

Freeze Drying

We are glad to inform that our new Freeze Dried Coffee plant will commence its production from March, 2007. The plant is being set-up with the latest machineries having state-of-the-art technology obtained from E & E, Germany. 

The basic principle of freeze drying in the process for producing instant coffee is the removal of water by sublimation.

Since the mass production of instant coffee began in post-WWII America, freeze drying has grown in popularity to become a very common method. This is often because although it is frequently more expensive than other methods of drying it generally results in a higher quality product.

The Freeze Drying Process

1. Agglomerated wet coffee granules are frozen. For instant coffee this is a very important stage. Freezing too fast leads to large ice crystals and a very porous product and can also affect the colour of the coffee granules.
   
   
2. Frozen coffee is placed in the drying chamber, often on metal trays.
   
   
3. A vacuum is created within the chamber. The strength of the vacuum is critical in the speed of the drying and therefore the quality of the product. Care must be taken to produce a vacuum of suitable strength.
   
   
4. The drying chamber is warmed, most commonly by radiation but conduction is used some plants and convection has been proposed in some small pilot plants. A possible problem with convection is uneven drying rates within the chamber, which would give an inferior product.
   
   
5. Condensation - the previously frozen water in the coffee granules expands to 107 its volume, the removal of this water vapour from the chamber is vitally important, making the condenser the most critical and expensive components in a freeze drying plant.
   
   
6. The freeze dried granules are removed from the chamber and packaged