How does the seed pellet machine ensure the seed germination rate?

Seed germination rate is the "lifeline" of agricultural production. As a key device for standardizing the processing of small and irregular seeds, the technical design and operation norms of seed pelleting machines directly determine the germination capacity of pelleted seeds. Unlike traditional manual seed coating, modern seed pelleting machines avoid damage risks from the source and enhance germination guarantees through precise mechanical control, ensuring that "good seeds" retain their strong vitality even after processing. Please provide the text you would like translated.

Mechanical Structure: Avoiding Physical Damage through "Flexible Processing"

The embryo and seed coat of seeds are the key parts for maintaining germination activity. Once they are damaged by compression, friction or impact during pelleting, the germination rate will drop significantly. High-quality seed pelleting machines achieve "flexible protection" of seeds through a triple mechanical design:

Firstly, there is a precise feeding system. A variable-frequency speed-controlled screw-type feeder is used, which can adjust the feeding speed according to the seed diameter (such as vegetable seeds, flower seeds, and grass seeds), avoiding accumulation and compression of seeds in the hopper. At the same time, a buffer soft pad is installed at the feeding port to reduce the impact force when seeds fall, especially for seeds with thin seed coats like tomatoes and peppers, effectively reducing the seed coat breakage rate. Please provide the text you would like translated.

The second is the controllable pellet forming cavity. The mainstream equipment adopts a "drum type" or "disc type" forming structure. The inner wall of the drum and the surface of the disc are both lined with food-grade silicone pads. The elastic property of the silicone can convert the hard contact between the seeds and the equipment into a soft contact. At the same time, the PLC control system is used to adjust the drum speed (usually controlled at 30-60 revolutions per minute) to ensure that the seeds remain in a "slight rolling" state during the process of being wrapped in the pellet shell layer, avoiding friction damage caused by excessive speed. Please provide the text you would like translated.

The last component is the staged drying module. If the pellets are directly dried at high temperatures after formation, it will cause the seeds to lose water too quickly and the embryo to become inactive. Therefore, professional pelletizing machines are equipped with a "low-temperature pre-drying + gradient temperature increase" drying system: in the initial stage, the surface moisture is removed at a low temperature of 35-40℃ to prevent the pellet shell from cracking; in the middle stage, the temperature is gradually increased to 45-50℃ to accelerate the evaporation of internal moisture; finally, the pellets are cooled to room temperature through a cooling device to prevent irreversible damage to the seed embryo caused by high temperatures.