Nut material shelling technology application (2)
1.1 Shelling method
(1) Microwave drying mechanical method: The principle is mainly to form high-pressure water gas inside the grain by microwave heating. When the pressure of the high-pressure water gas is greater than the tensile limit stress of the peel, the peel breaks and the shell is broken. In the process of breaking the shell by microwave method, the dense structure of the nut peel is an important guarantee for the formation of high pressure inside the nut; the moisture contained in the nut is the material foundation for generating high-pressure water gas inside; the heating temperature of the microwave is the external power that causes high-pressure water vapor. However, rapid heating can cause the product to expand and even explode.
(2) High pressure expansion method: The principle is to make the fruit in a high pressure chamber, let the fruit stay in it for a long time, so that the pressure balance is reached inside and outside the grain, then the pressure is instantaneously relieved, the internal and external pressure balance is broken, and the gas in the shell is Under the action of high pressure, a large bursting force is generated to break through the shell, thereby achieving the purpose of shelling.
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