FD-5 middle scale vacuum freeze dryer Vacuum freeze drying technology: The freeze drying process is to freeze the materials firstly, and after frozen the products will be load into the vacuum drying tank which will bring the vacuum environment for the ice to sublimate to vapor, and with the condenser inside the tank condense the vapor to ice on the surface of the coils, the products will be dehydrated. Gusset Tea Bags,Gusset Kraft Paper Bag,Stand Up Foil Food Gusset Bag,Foil Lined Coffee Bean Gusset Bag Shenzhen Lehua Packaging Materials Co., Ltd , https://www.zjlehuapackaging.com
Main applications for food:
Freeze drying is used to preserve food, and because of its unique characters, the process has been popularized in the forms of freeze-dried ice cream initially as astronaut food.
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And with the development of this technology and decrease of processing cost, it is nowadays also widely used to produce essences or flavorings to add to food. Because of its light weight per volume of reconstituted food, freeze dried product is also popular and convenient for hikers. More dried food can be carried per the same weight of wet food, and has the benefit of "long life" compared to wet food that tends to spoil quickly. The hikers then reconstitute the food with water available at point of use. Instant coffee is sometimes freeze-dried, despite the high costs of the freeze-driers used.
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Freeze-dried fruits are used in some breakfast cereal or sold as a snack, and are an especially popular snack choice among toddlers, preschoolers and dieters, as well as being used by some pet owners as a treat for pet birds or koi fish.
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Culinary herbs are also freeze-dried, although hot air dried herbs are far more common and less expensive.
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And freeze-dried instant soup is also very popular in the meals provided on air plane.
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Freeze drying, also known as lyophilization, is a dehydration process typically used to preserve a perishable material or make the material more convenient for transport.
Working principle:
The technology of Vacuum freeze drying is mainly utilizing the principle that water will sublimation directly from ice to vapor when it is in some specific vacuum environment. The freeze drying process is to freeze the materials firstly, and after frozen the products will be load into the vacuum drying tank which will bring the vacuum environment for the ice to sublimate to vapor, and with the condenser inside the tank condense the vapor to ice on the surface of the coils, the products will be dehydrated.
Advantages of freeze dried food:
There are several advantages of freeze-dried products when compared to regular hot air dried products.
1) The freeze dried products have long preservation time. If a freeze-dried substance is sealed to prevent the rehydration of moisture, the substance may be stored at room temperature without refrigeration, and be protected against spoilage for many years. Preservation is possible because the greatly reduced water content inhibits the action of microorganisms and enzymes that would normally spoil or degrade the substance.Â
2) Easy transportation. With light weight and well packed freeze dried products can be easily transport by normal containers or any other transportation method. No needs for cold storage facilities therefore save a lot of cost for transportation.
3) Better quality products. Freeze drying causes less damage to the substance than other dehydration methods using higher temperatures. Freeze-drying does not usually cause shrinkage or toughening of the material being dried. In addition, appearance, flavors, smells and nutritional content generally remain unchanged, making the process popular for preserving high quality food.
4) Extremely high rehydration capacity. Freeze-dried products can be rehydrated (reconstituted) much more quickly and easily because the process leaves microscopic pores. The pores are created by the ice crystals that sublimate, leaving gaps or pores in their place. This is especially important when it comes to instant or convenient food uses.
Main systems:
> Vacuum drying vessel system
>Â Heating system
>Â Cold trap condensing and defrosting system
>Â Vacuum system
>Â Freezing system
>Â Refrigeration system
>Â Material handling system
> Control system
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