Spiral Freezers
• Cryogenic spiral freezers
• Mechanical spiral freezers
• Cryogenic spiral freezers convertible into mechanical spiral freezers

Freezing Tunnels
• Continuous in-line I.Q.F. freezing tunnel
• “Cryofood” cryogenic freezing tunnel with trays
• “Cryofood” mechanical freezing tunnel with trays
• Quick-freeze linear tunnels

Freezing Chambers
• Mechanical freezing chambers
• Cryogenic freezing chambers

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• Leavening
• Pasteurization
• Baking
• Protection
• New Production Lines


Cryogenic spiral freezers convertible into mechanical spiral freezers

Among the latest machines in COGIL’s range is a new type cryogenic freezing spiral that is already set for further conversion into a mechanical freezing spiral. This will allow customers to start working with a cryogenic system, which is commonly known as less costly, smaller, ten times less demanding in terms of power than mechanical freezing systems of equal output capacity, until they have tested out the potential for development of their new products.
The technical specifications necessary to build this machine model make this system a little more expensive, initially, than any conventional cryogenic freezer of equal hourly output. A very important point is the significant cost saving feature provided by this system when used as cryogenic system. Users can save up to 50% on cryogenic gas per kilogram of product. This reduction on costs is given by the fact that all the elements of this machine are designed to facilitate later conversion into a mechanical system, so the machine comes with a conveyor belt allowing the product to remain in the refrigerated box during the freezing procedure.
With the product being allowed to stay in the box for some time, the temperatures required to perform the freezing procedure are not more than –35/- 40°C; this in turn means the ability to use more of the cryogenic gas enthalpy change.
Another important advantage is that by slightly increasing the freezing temperature, the user can easily cope with any peaks in hourly output that may arise from time to time. A further advantage is that any future conversion of the cryogenic freezer into a mechanical freezer will be easily carried out by placing an additional chamber, with all the parts that are necessary for the transformation of the unit, next to the cryogenic spiral chamber. The new chamber will be constructed and thoroughly integrated at COGIL’s plant.



Technical description of the cryogenic system.
The spiral freezer comprises the following units:
• An insulated enclosure where the freezing process takes place
• A conveyor belt placed inside the enclosure for continuous conveyance of products throughout the freezing cycle
• A ventilation, regulation and cryogen suction centre
• An automatic conveyor belt washing system
• An electric control panel housing the system’s centralized controls
The enclosure consists of a one-piece construction with a stainless sheet steel double wall with 120 mm thick, self-extinguishing polyurethane foam insulation.
This type of construction, besides providing unlimited durability, also prevents any water seepage or filtering of contaminants through the walls hollow spaces. The enclosure (as shown in the drawing enclosed) is provided with manual doors allowing full access to all inner parts of the spiral, making cleaning operations at the end of the work cycle easy and quick to perform.
The conveyor belt is located inside the enclosure and moves along a closed circular loop that winds in spiral around a rotary drum. The length of the freezer belt is designed according to the hourly output rates expected from the freezer in its final, mechanical version; therefore, right from the start, belt length will be threefold the length that would be necessary for cryogenic freezing procedures.
The cryogen gas regulation and suction centre consists of a modulating valve with proportional opening features. The modulating valve controls the flow of cryogen liquid into the freezer. Because of the length of the belt, the required freezing temperature ranges between –30° and -40°C. A proportional digital thermostat regulates the temperature. Adequate ventilation is provided all along the belt circuit to ensure efficient heat exchange with the freezing product.
Spent gases are sucked in via the product in feed and out feed openings and are directed to an external exhaust. The automatic belt washing system is located externally, in the product loading area and consists of a pipe feeding a series of spraying nozzles fed by a high-pressure electric pump.
Washings collect in a tub under the spraying ramp and then flow into the water drain. The electric panel is equipped with all the accessories required to assure full automatic control and operation of the process.




TECHNICAL DESCRIPTION OF THE ACCESSORIES AND REFRIGERATING CENTRE THAT ARE NECESSARY FOR CONVERTING THE EXISTING SYSTEM INTO A MECHANICAL FREEZER.

The cryogenic freezer will be integrated with:
• An insulated enclosure where the refrigeration accessories are kept
• A mechanical refrigerating centre
• An electric panel for operating the refrigerating centre

The enclosure containing the refrigeration accessories (just like the freezing enclosure) consists of a one-piece construction with a stainless sheet steel double wall with 120 mm thick, self-extinguishing polyurethane foam insulation.
As shown in the drawing enclosed, the enclosure is provided with manual doors allowing full access to all inner parts of the spiral, making cleaning operations at the end of the work cycle easy and quick to perform.
Full access to all evaporator parts is also provided.
Inside the enclosure is a conduit of stainless steel panels to assure even delivery of cold air on and around the product at a speed of approx. 3 metres per second.
The refrigeration unit for mechanical product freezing is based on screw compressors with separate circuits for independent operation, to be positioned externally and away from the unit.
The air cooling evaporator consists of a battery with copper tubes and copper fins, designed to expand FREON gas directly. The battery has a double stage construction so the air can be cooled to –40°C when freezing at full speed.
The air circuit, which assures heat exchange with the battery as well as product ventilation during the freezing process, is provided with centrifugal electric fans with the fan wheels positioned inside the enclosure and the motors positioned on the outside.


The evaporation battery is equipped with armoured resistances of adequate power for defrosting operations.
The electric panel is equipped with all the accessories required to assure full automatic control and operation of the process via PLC.