Do You Know IQF Freezing

Individual Quick Freezing usually abbreviated Freezing IQF is a freezing method used in food processing industry. Products commonly frozen with IQF Freezing technologies are typically smaller pieces of food products and can range from all types of berries, fruits and vegetables diced or sliced, seafood such as shrimps and small fish, meat, poultry and even pasta, cheese and grains. Products that have been subjected to IQF are referred to as Individually Quick Frozen or IQF’d

One of the main advantages of this method of preparing frozen food is that the freezing process takes only a few minutes. The exact time depends on the type of IQF Freezing and the product. The short freezing prevents formation of large ice crystals in the product’s cells, which destroys the membrane structures at the molecular level. This makes the product keep its shape, colour, smell and taste after defrost, at a far greater extent.

Another significant advantage of IQF Freezing technology is its ability to separate units of the products during freezing, which produces higher quality product compared to block freezing. This advantage is also important for food sustainability, as the consumer can defrost and use the exact needed quantity. There is a range of IQF Freezing technologies, but the main concept is to transport the product into the freezer with the help of a processing line belt or infeed shaker. Inside the freezer, the product travels through the freezing zone and comes out on the other side. Product transportation inside the freezer is by different technologies. Some freezers use transportation belts similar to a conveyor belt. Others use bed plates that hold the product, and an asymmetrical movement makes the plate advance by itself through the freezer.

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Drying Speed (Freeze Dyring Machine)

In the drying process of fruits and vegetables, the speed of Frozen Solution plays an important role in the quality of dried fruits and vegetables. What will affect the drying speed when fruits and vegetables are dried? When the other conditions are the same, the faster the drying speed, the better the quality of dried fruits and vegetables. Of course, the drying speed is also limited by other factors, such as temperature, humidity, air flow rate, and characteristics of fruits and vegetables.

1. Temperature and relative humidity of dried fruits and vegetables

The temperature and humidity of the drying medium determine drying speed. The higher the drying temperature, the lower the humidity, the faster the water evaporates, and the faster the drying speed. However, for some products, the temperature is too high, but it will form a reaction, affecting the quality. Conversely, with is low temperature, the drying time is prolonged, and the product is prone to oxidative discoloration or even mildew. According to the relevant experiments, for higher water content, the drying temperature can be maintained higher, and later adjustments should be made, combined with internal and external diffusion. For fruits and vegetables with low water content, it is not advisable to use excessively high temperatures to avoid splitting, coking, and crusting of the epidermis. Different temperatures are chosen for different fruits and vegetables, generally 40-90°C. Suitable equipment for drying at this temperature are: belt dryer, dehydrated vegetable dryer, hot air circulation oven, new oven, vacuum dryer.

2, Air Flow Rate

The air flow rate is large, and the fruits and vegetables dry quickly. Some fruits and vegetables need to increase the wind speed, and the drying time is shortened accordingly, and the quality is good.

3. Types and status of fruits and vegetables

The variety of fruits and vegetables differs in physical properties and structure, and the drying speed is different under the same conditions. According to the evaporation amount, moisture, color, etc., it is generally possible to slice, diced, and cut the difficult-to-dry materials to obtain better quality and optimum drying speed.

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Main Features of Vegetable Drying Machine

The biggest feature of Vegetable Drying Machine is that the color and quality of products after drying does not change. Some experts said that a large number of vegetables are on the market during the harvest season, and many local markets are oversupplied. Fresh vegetables have high water content, strong postpartum respiratory metabolism, and extremely perishable characteristics, which bring considerable difficulties to the storage, transportation and circulation of agricultural products. Therefore, in order to reduce the huge losses of vegetables after the birth, in addition to extensive use of pre-cooling, preservation methods, etc., dried vegetables is also an effective way to regulate supply and demand, digest seasonal surplus, reduce post-natal decay losses, and it is also an effective supplement for fresh vegetables; The drying of vegetables can effectively increase the added value of products as an effective way to increase farmers’ income and promote local economic development.

Rural flue-cured tobacco growing areas in China, tobacco farmers are single-family households to build roasting tobacco houses to dry their own harvested tobacco leaves. For a large number of flue-cured tobacco families, the quality and color of tobacco leaves should not be underestimated. Therefore, the application of tobacco farmers to Vegetable Drying Machine is of great practical significance. The emergence and application of Vegetable Drying Machine have reduced the huge losses of tobacco farmers after production, and the characteristics of non-discoloration and quality have become the biggest advantage of fruit and vegetable dryers.

In a word, because the fruit and Vegetable Drying Machine has national policy support, with low cost, high efficiency, simple operation, and complete functions, the application in rural areas is becoming more and more popular. The application of vegetable dryers has essentially developed the production level of rural agriculture, liberated and improved the productivity of local rural areas, and greatly guaranteed production efficiency. Vegetable Drying Machine is increasingly becoming the new choice for rural vegetable drying.

If you interested in GuanFeng Vegetable Drying Machine or our Pre Processing Equipment , please click gf-machine or gf-machine.com for futher more information.