Tunnel freezer

The food products are transported on a rust-proof conveyor belt through an insulated tunnel.

The tunnel is made of stainless steel and provides easy access for cleaning the interior. A PLS is used for control, and this regulates the belt speed and the injections of liquid gas. The injections are automatically controlled via the tunnel temperature for optimalization of the gas consumption.

The liquid gas (via dry ice snow for CO₂ ) will absorb heat from the products and is converted to cold gas-containing atmosphere in the tunnel.

In practice, this tunnel type of freezer is used for food products of a limited thickness, max. 5-6 cm.

Tunnels of this type are supplied in different sizes with capacity from 100 to 1000 kg per hour.