Cryogenic Cooler for Applications Where Fast Cooling is Required

AJAX Equipment

Milton Works, Mule Street, Bolton, UK, BL2 2AR
Tel: (0)1204 386723      Fax: (0)1204 363706

Ajax Cryogenic Coolers are screw based units designed for the continuous freezing or chilling of bulk products using liquid nitrogen refrigerant. Fast and efficient cooling is achieved by direct sprating of the liquid nitrogen over the product as it is mixed and transported. The material is normally in a diced, shredded, or natural particulate form, as for example, shrimps or rice.

The units are made from Stainless Steel and are available in a range of sizes to suit process requirements. Particular care has been exercised with the internal and external finishes to ensure the units are crevice free and easily cleaned.

The internal form of the cooler is similar to a conventional U-trough conveyor but the auger is of special design appropriate to the material being processed. The trough is insulated within a stainless casing for safety and to maximise thermal efficiency.

This range of coolers combines Ajax's long experience in the handling and heat transfer of loose solids and BOC's expertise in liquid Nitrogen technology.


The residence time of material in the cooler is controlled by the length, design and rotational speed of the screw. These variations allow a wide range of materials to be processed and for the output rate and material condition to be optimised.

To achieve optimum performance it is essential that the feed and its presentation to the scrwe are considered as an integral part of the process.


Food Preservation: Cooling of seafoods, Meat based products, Cheeses, Fast foods.
Flavour Retention: Spice chilling for retention of flavours during milling.
Embrittlement: To achieve or maintain the product in a brittle condition eg. Rubber, Thermo-plastics and Resins.

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