Freeze-dried Seafood

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Freeze-dried seafood

The whole freeze-drying process of a lyophilizer is actually a simultaneous process of heat and mass transfer (water vapor). Heat and mass transfer rates affect the drying rate and thus the entire freeze-drying cycle. All the factors that affect heat and mass transfer affect the drying rate. Let's take a closer look.

1. Morphology and composition of materials

A freeze-dried material is usually classified as a solid or a liquid according to its form. The shape of the solid and the concentration of the liquid have a greater effect on the freeze-drying rate.

2. Pre-freezing rate

The size of the crystals formed during freezing greatly affects the drying rate and the rate at which the products dissolve after drying. The processes of rapid and slow freezing are different in the following ways: fast freezing produces smaller ice crystals, while slow freezing produces larger ice crystals. Large ice crystals are favorable for sublimation, while small ice crystals are unfavorable. Rapid freezing results in low sublimation rates and rapid desorption rates. Slow freezing results in a fast rate of sublimation and a slow rate of decomposition.

3. The load

When the material is lyophilized, there is a corresponding ratio between the surface area and the thickness of the material after it is packaged in the container, that is, lyophilization is related to the loading amount. Small surface area and thickness are conducive to sublimation of water, easy freeze-drying, and good quality. In general, the thinner the material, the faster the heat and mass transfer rate, and the shorter the drying time. However, if the thickness of the material is thin, there will be less drying material in each batch of freeze-drying area, which is unfavorable to increase the yield per unit freeze-drying area and per unit time.

4. Pressure of drying chamber

Pressure in a drying chamber affects the rate of heat and mass transfer. As far as mass transfer is concerned, the lower the pressure the better, and as far as heat transfer is concerned, the higher the pressure the better. The mass transfer rate depends mainly on the temperature and pressure at the sublimation interface and the dry layer surface. In order to increase the escape rate of water vapor in the dry layer, one way is to increase the temperature at the sublimation interface to increase the pressure of water vapor at the interface. This is to increase the vacuum of the drying chamber and to reduce the vapor pressure on the surface of the drying layer.

Parameter:

Model	KFD-1	KFD-5	KFD-10
Capacity (Kg/Batch)	10	50	100
Shelf Area (㎡)	1.1	5	10
Shelf Size (Mm)	500*400	800*895	1190*800
Shelf Quantity (Layer)	5+1	7+1	11+1
Shelf Temperature (℃)	-60 to +70
Water Catcher Temper (℃)	-65±5
Max Catch Water（Kg）	15	75	150
Ultimate Vacuum	1	1	2
Electricity（Kw）	12	22	41
Size（Mm）	2200*1000*2000	2200*1200*2400	4540*1400*2450
Weight（Kg）	1500	2500	3800

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