The pod shell has protective effect on nuts. After hulling, the seeds come into direct contact with air, moisture and oxygen, so the respiration and enzyme activity are enhanced, and the nutrients in the seeds are consumed, which reduces the vitality of the seeds and leads to slow and irregular emergence. So the closer the hulling time is to the sowing date, the better. Generally, the hulling is about 10 days before sowing. The earlier the hulling time, the higher the probability of seed kernel infection, the worse the enzyme activity of seed kernel, and the lower the germination rate and germination potential.
The traditional shelling is manual shelling, which is not only easy for fingers to get tired and injured, but also inefficient. The birth of peanut sheller changed this situation to a great extent, which made farmers in peanut producing areas no longer need to use the most primitive sheller method, thus greatly reducing the needs of farmers.
Manual labor also improves the efficiency of peanut hulling, and the processed peanuts have low crushing rate, clean sorting, good color and less impurities.