In recent years, the processing and consumption of frozen food has been growing rapidly, and there are more and more varieties of colours, and the quality requirements for frozen food are getting higher and higher. In order to adapt to the technological characteristics of different foods, shorten the freezing time, and improve the quality and production efficiency of frozen food, the freezing process of food has evolved from a single freezing room freezing to the use of a variety of new types of continuous freezing devices for freezing and processing.

Compared with general freezing room, food freezing device has the following characteristics:

（1）It is a kind of equipment in the production line of food freezing processing, unlike the freezing room which is an integral part of the cold storage.

（2）Because of the shortened freezing time, it has high production efficiency, good product quality and less dry consumption.

（3）Its structure is compact, the position is more flexible in the layout of the factory, and it can make effective use of the site.

（4）It is generally supported by professional factory production, so it is convenient to install.

（5）It can be arranged in the general plant, workers can operate and maintain at room temperature, improving labour conditions.

（6）The freezing device facilitates the continuous and automated production process, saves labour and also reduces microbiological contamination of food.

Types of Food Freezing Devices

According to the food in the cooling, freezing process of heat released by the cooling medium to take away the different ways, food freezing device can be divided into the following categories.

Blast Freezing Device

Blast freezing device is to use the air as a cooling medium, increase the wind speed of the food for freezing, it is currently the most widely used type of freezing device.

Contact freezing device

Contact freezing device is placed in the frozen food between two metal plate, relying on thermal conductivity to transfer heat. Due to the thermal conductivity of metal than the air surface heat transfer coefficient of tens of times, so the contact freezing device freezing speed, it is suitable for freezing block or rule of food.

Liquefied gas spray freezing device

Liquefied gas spray freezing device is liquid nitrogen or liquid carbon dioxide directly sprayed on the surface of food for rapid freezing. It is characterised by fast freezing speed and high quality of frozen products.

Immersion freezing device

Immersion freezing device is the frozen food directly immersed in non-freezing liquid (brine, ethylene glycol, propylene glycol, alcohol solution or sugar solution) for freezing. It is characterised by fast freezing speed, but the non-freezing liquid needs to meet food hygiene requirements.