Why is the water for pelletizing introduced from the bottom while flowing out from above?

During the extrusion granulation process, particle water enters from the bottom of the pelletizing water chamber primarily to ensure good wetting and cooling effects. Such a design has several advantages: Firstly, water intake from the bottom allows for a more even distribution of water throughout the granular material, ensuring that all of it is properly moistened. Secondly, water intake at the bottom also serves a cooling purpose, as a large amount of heat is generated during the extrusion granulation process; the water introduced from the bottom can help reduce this temperature and prevent the equipment from overheating. Finally, with the help of gravity, water entering from the bottom can more effectively push water throughout the granulation water chamber, while also helping to prevent water from overflowing and being wasted. In contrast, if water is introduced from the top, it may not be distributed evenly throughout all of the material, resulting in a reduced wetting effect. Cooling also cannot be carried out effectively, and there is a greater risk of water overflow and waste. Therefore, when performing extrusion granulation, it is usually chosen to feed water from the bottom of the pelletizing water chamber. .

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