Blast Freezer Manufacturers
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Browse Blast Freezer Suppliers →Blast freezers — types and applications
A blast freezer uses high-velocity cold air fans to rapidly freeze or chill food products. Unlike IQF, spiral, or tunnel freezers (which are continuous systems), blast freezers are predominantly batch systems — product is loaded on trays or trolleys into the freezer, the door is closed, and the freezer runs until the product is frozen, then the product is removed and replaced with the next batch. Blast freezers are widely used in catering (hotels, large restaurants, institutional kitchens), food production at medium to small scale, fish processing (freezing whole fish or fillets on trays), meat processing, and cold store operations. Commercial blast freezers include: blast chill cabinets (cool hot food rapidly from cooking temperature to below 5°C — for food safety compliance in catering; not a full freezer, but operates in a similar way); blast freeze cabinets (freeze product to -18°C or below — for medium-scale food production and catering); and blast freeze rooms or chambers (larger insulated rooms with industrial refrigeration and fan units — for high-volume batch freezing in fish processing, meat processing, and frozen food production).
Frequently asked questions
What is the blast freeze cycle time for a typical product?
Blast freeze cycle time depends on the product dimensions (specifically the thickness at the thermal centre), the initial product temperature, and the blast freezer air temperature and velocity. Thin products (fish fillets below 15mm thick, thin meat cuts) may freeze through in 30–90 minutes in a commercial blast freezer. Thicker products (whole fish, large meat cuts, thick ready meal trays) may require 2–6 hours or more. A blast freeze room operating at -30°C to -35°C with high-velocity fans freezes product faster than a standard frozen storage cold store. Do not rely on indicative times — validate the actual freeze cycle time on your specific product using temperature probe measurements at the thermal centre. Blast freeze cycle time is a critical operational parameter for planning production schedules and cold store capacity.
What is the difference between blast chilling and blast freezing?
Blast chilling reduces the temperature of hot cooked food rapidly from above 60°C to below 5°C (or below 3°C for some products) — it does not freeze the product. Blast freezing reduces the product temperature below -18°C. The distinction is important for food safety: blast chilling is the required food safety step after cooking for chilled ready meals and catering products (passing through the 60°C to 5°C range quickly to prevent bacterial growth); blast freezing is used when the product is intended to be sold or stored frozen. Most commercial blast chilling cabinets can operate in both chilling and freezing modes — they are called blast chiller-freezers. Confirm the mode of operation you require and the temperature capabilities of any unit you evaluate.
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