Fruit and Vegetable Freeze Dryer Equipment

Fruit And Vegetable Freeze Dryer Equipment

The fruit and vegetable freeze dryer equipment freezes substances containing a large amount of moisture in advance and freezes them into solids in advance, and then directly sublimates the water vapor under vacuum conditions, while the substances themselves remain in the ice shelf during freezing, so it is loose and porous after drying. The volume does not change. Cause the temperature of the product itself to drop and slow down the sublimation speed. In order to increase the sublimation speed and shorten the drying time, the product should be properly heated. The whole drying is carried out at a lower temperature.

When the solution is quick-frozen, the grains remain at the size visible under the microscope; on the contrary, when the solution is slow-frozen, the crystals formed are visible to the naked eye. Coarse crystals leave large gaps in the sublimation, which can improve the efficiency of freeze-drying, while fine crystals leave small gaps after sublimation, which hinders the sublimation of the lower layer. The structure is good, the dissolution speed is fast, and the moisture absorption of the finished product is relatively stronger.

The freezing of the product is in a static state. Experience has shown that the phenomenon of supercooling is easy to occur so that although the temperature of the product has reached the eutectic point, the solute is still not crystallized. Allow the product to freeze completely.

Freeze-dried fruits and vegetables still have great advantages in nutritional preservation, but there is still some gap between them and fresh fruits and vegetables. It is hard to say how much this gap is. Because different types of fruits and vegetables and different specific processing conditions will make this gap different, but even so, freeze-drying is much better than other drying methods. Remember one thing, if you can eat fresh, eat fresh, if you don't have fresh, eat freeze-dried, and if you don't have freeze-dried, eat other. Another point to understand is that modern people do not lack nutrition but pursue delicious food, so freeze-dried food is not only easy to preserve but also has a flavor that fresh fruit does not have.

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