What is a blast freezer?
Simply put, a blast freezer is just a freezer which is very cold. Blast freezers are sometimes referred to as shock freezers. The idea of this type of freezer is to very rapidly bring down the temperature of (usually) foodstuffs or fresh produce, freezing them very quickly. They are widely used in the frozen food industry for things like iced cream, pre-prepared meals and vegetables or fish. A lot of commercial kitchens also use them for frozen food storage.
Why shock freeze?
When you freeze food (or anything else for that matter) the water inside crystallises into ice. The longer the freezing process takes, the larger the ice crystals. Larger ice crystals damage materials by causing things like cell bursting, which affects quality and flavour of foods. Very rapid freezing within a blast freezer causes the crystals formed to be very small, which does less damage and preserves food at a higher quality. Even more usefully, once the food is “blast frozen” it can be moved into a normal freezer for longer term storage – as long as this one stays cold enough for the food to stay frozen, of course.
How does blast freezing work?
A lot of blast freezers use blower fans which force cold air across the contents of the freezer in order to rapidly chill it. Others can work in other ways depending on the design. Blast freezers can be equipped with trays which move about in order to position foods, and often include various compartments for freezing. An average freezer can normally handle foods at room temperature or even heated as long as the capacity of the freezer is not overloaded. Put a lot of hot food in the freezer and its temperature will rise which will negatively affect its cooling capacity.
Is blast freezing safe?
Aside from the integrity, quality and taste of the food, blast freezing also offers a health and safety benefit in that extreme cold slows down the growth of bacteria. Provided that the food is handled safely and then put into the freezer immediately after preparation, there is a greatly reduced risk of contamination. This benefit to food safety is one of the reasons why blast freezing is very popular in commercial food preparation areas, as it greatly reduces the risk to customers and consumers.
CRS Portable Blast Freezers
Our portable blast freezers are immensely useful for all kinds of applications including food storage, and especially where a static freezer is not an option due to space constraints or planning permission needs. We have freezers available to rent, lease or purchase in a variety of powers and capacities. Get in touch with our cold storage sales team to find out how we can help you with your shock freezer storage today. test