Burgdorf, close to Berne, the Swiss capital, is home to the unique cold spray tower, called the Birs-tower. With its height of 75m it is the highest of its kind worldwide The concentrated pulp is sprayed free of any additives from the top of the tower. From the bottom, dried and cooled (less than 50°C) air is blown into the tower. The resulting counter current is responsible for a gentle process removing water from the pulp. The thermal stress of the product is minimal, which is why an optimum retention of colour and taste as well as high protection of nutrients such as vitamins are guaranteed.

With a few exceptions, all SPREDA^® cold spray dried powders are 100% pure and free of any additives such as carriers or anticaking agents (i.e. SiO₂). For the moment Apple, Tomato and Carrot are the products processed by the Birs-Technology.

Process parameter:

Process Scheme Birs Spray Tower

Advantages of cold spray drying

• Free flowing and pure products (no additives)
• High colour and taste retention through gentle drying conditions
• Cost effective thanks to high capacity
• Dried products of high water binding capacity

Disadvantages of cold spray drying

• Time consuming cleaning procedure
• High production capacity needed for an optimum rentability

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