Common methods for peeling walnuts:

1. Stacking and retting for peeling

After harvesting, the fruits should be stacked in outdoor shade or indoors in time, and should not be exposed to the sun, and then piled in piles with a thickness of about 5cm. Don't pile it too thick. If it is piled too thick, the green husk will rot easily, and it will easily pollute the shell surface if it is not handled in time. If a layer of hay or dried leaves with a thickness of about 1cm is added to the fruit pile, the temperature in the pile can be increased, the fruit ripening can be promoted and the peeling speed can be accelerated.

when the peel is detached or cracked by more than 5%, you can peel it with a stick or cut it with a knife. For those who have not peeled, they can be piled and retted for several days until they are all peeled. Don't blacken or even rot the green husk when composting, so as to avoid the pollution of seeds caused by the infiltration of sewage into the shell and reduce the quality and commodity value of nuts.

2. Drug peeling method

Use ethephon to accelerate ripening and peeling. The specific method is: after the fruit is harvested, it is dipped in .3%-.5% ethephon solution for about 3 seconds, or sprayed on the fruit surface with a sprayer, and the walnut is turned while spraying. Stacked in the shade or indoors according to the thickness of about 5cm, the peeling rate can be as high as 95% at the temperature of 3℃ and the relative humidity of 8%-95%. Cut with a knife or tap with a wooden root.

3. Mechanical peeling

Use a walnut peeling machine for processing. It has the advantages of no need of piling and retting green fruits, high peeling efficiency, clean peeling, no damage to the inner core, peeling and cleaning at the same time, etc. After peeling and cleaning, it can be directly dried or dried. It is required that the green tangerine peel fruit is free from pests and diseases and the green tangerine peel is complete

Extended information:

1. The reason why the fresh walnut peel is blacked is that it contains "walnut green pigment", which contains walnut, α-hydrogenated walnut -4- glucose, tannin, gallic acid and walnut drunk. Among them, tannin (tannic acid) and gallic acid dyed their hands brown after oxidation reaction;

2. Cleaning methods of black hands damaged by walnuts:

(1) Black oxide of walnut green pigment is contaminated on hands, so you can only wash your hands frequently, and slowly remove them by metabolism, aging and shedding of human skin epidermal cells;

(2) You can sprinkle some salt first, gently moisten it with water, and then soak it in soapy water to wash it. It has a certain effect on slightly blackened hands. Wash it several times and slowly fade it.