Fluidised freezing tunnels

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The fluidized freezing tunnel (IQF) is the most popular quick-freezing device. Using the fluidization technology, the processed product behaves like a boiling liquid: air driven by fans, flows through the evaporator, and then through the perforated belt, causing the product to move, preventing it from sticking to each other. The effect of the tunnel operation is a fully frozen, loose, separated product that retains its true taste, ready for packaging! Maszyny do zamrażania owoców, warzyw, owoców morza, mięsa i drobiu - Unidex

The IQF fluidization freezing tunnel is an ideal device for freezing:

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fruits vegatables mushrooms
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herbs fish and seafood elements of meat

IQF tunnels parameters

IQF fluidised tunnels manufactured by Unidex are intended for freezing fruit, vegetables, meat, poultry, fish, seafood and herbs. They are divided into two series:

  • M series tunnels (capacity from 1000 to 3400 kg/h) – belt working width - 800 [mm]
  • A series tunnels (capacity from 4300 to 12000 kg/h) – belt working width - 1200 [mm]

All tunnels and their components manufactured by Unidex meet all the necessary standards and directives in force in the European Union, including the provisions of the Office of Technical Inspection and sanitary regulations.

Here are some sample directives:

Pressure Equipment Directive PED (2014/68 / EU)
Machinery Directive (2006/42 / EC) EMC Directive (2014/35 / EU)
Low Voltage Directive (2014/35 / EU)
Hazard Analysis and Critical Control Points (HACCP) System

IQF Tunnels
Serie M Serie A
Yield for peas
(+15 -> -18 [°C])
1700 - 3400 [kg/h] 4300 - 12000 [kg/h]
Yield for the strawberry
(+20 -> -18 [°C])
1200 - 2400 [kg/h] 3000 - 8500 [kg/h]
Refrigerant ammonia - freon - CO2
Circulation of the factor pump or gravity (DX)
Recommended evaporation temperature -40 [°C]
Electric supply 3x400 [V] / 50 [Hz]

IQF tunnels – M series

M series fluidisation IQF tunnels are tunnels with a lower capacity: from 1000 to 3400 kg/h. The refrigerant can be both ammonia NH3 (R717), freon (R404A, R507, R449A) and CO2. They are also characterized by smaller dimensions. These are tunnels ideal for customers starting their adventure with freezing or smaller processors.

IQF tunnels – A series

A series of fluidisation IQF tunnels are tunnels with a high capacity from 4,300 to 12,500 kg/h. The refrigerant can be both ammonia NH3 (R717), freon (R404A, R507, R449A) and CO2. High capacities require larger tunnel dimensions, therefore A series tunnels are an offer mainly for medium and large enterprises.

IQF tunnels equipment

The IQF Unidex tunnel consists of two main parts - the belt section and the evaporator section. The belt section is divided into two pressure chambers, located under the perforated, modular belt. In each chamber there are fans equipped with frequency converters that enable the control of the fluidization process and the entire freezing process. The evaporator section consists of evaporators designed, calculated and manufactured by Unidex, dedicated to various refrigerants: ammonia, freons and CO2.

A vibrating feeder installed in front of the tunnel is responsible for the continuous distribution of the product and feeds the product directly into the tunnel.

Each Unidex IQF tunnel is also equipped with an external 1st belt cleaning system, which allows periodic or continuous cleaning of the 1st belt during freezing - without stopping production.

UDS is a system that is used to remove frost from evaporators, using a blast of compressed air. Each evaporator has a compressed air tank to support it with air nozzles positioned to remove frost, snow and ice from between the evaporator fins. The entire UDS system is controlled automatically by the tunnel computer. Thanks to the use of the UDS system and the external belt cleaning system, it is possible to operate the tunnel for up to 22 hours between defrosts.

The control touch-panel is located on the door of the control cabinet and allows precise control over all components of the tunnel without the need to enter its interior.

The tunnel can also be equipped with an additional CIP (Cleaning-In-Place) system, sequential defrosting system or remote access system.

IQF tunel benefits

During designing tunnels, we always aim to obtain the highest quality frozen product. Our advanced technology allows you to freeze a wide range of products using the same tunnel - all thanks to the extensive control of the freezing process and tunnel components. We guarantee durability and reliability while reducing electricity and water consumption. Frost removal devices (UDS) allow you to minimize the downtime between successive freezing cycles and to obtain maximum efficiency in relation to the size of the tunnel.


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