Peeling skin: China's traditional method is to pile up peeling. The specific method is to pile up the walnut green peel together, cover the sheet or grass (avoid sun exposure), and promote maturity. After the 3-4 days of green peels are piled up, they are beaten with wooden sticks and the green skin can be removed. However, this method is often piled up for a long time due to the effects of rain or rain. It is also easy to damage the surface of the nuts. Serious pollution, affecting product quality. In order to solve this problem, the Shandong Institute of Fruit Research trials 3000-5000ppm ethephon solution to fully dip the green walnut fruit and place it at a temperature of 30°C and a relative humidity of 80%. After 5 days, the peeling rate is over 95%. The rate is 85% and the secondary fruit is 13.2% (stacking method is 33.2% and 13.8% respectively). This method saves labor and costs, has a clean surface, and is of good quality. It is worth promoting and applying.
Bleaching and Washing: In order to ensure the appearance of nuts, the nuts are sold in domestic and foreign markets. The nuts and nuts must be bleached and washed. Firstly, the wet peeled walnuts are washed with water, washed with mud and black dirt, and then bleached and bleached. Disable ironware, porcelain utensils best, farmers generally use water tanks, bleach solution is 5-7 times the sodium hypochlorite aqueous solution, generally prepared with warm water, the bleached walnut fruit into bleach, into the amount to make the liquid Dipping for the degree, stirring 5-8 minutes, you can remove and pour clean water, 50-80 kg of wet walnuts per kilogram of medicine can be rinsed, a cylinder of liquid can be rinsed 7-8 times, the bleached walnut should be Immediately wash 2-3 times, and the bleach is washed thoroughly. The bleached walnuts are then allowed to cool, and the moisture content of the nuts after drying is required to be 6.5%, not more than 8%, and the kernels are crispy.
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