The key components of the bottom spray method consist of a moving bed (raw material container) and a spouted bed. The bottom jet flow distribution plate at the bottom of the container distributes the air flow between the inner and outer cylinders. Most of the air flow flows upward through the spouted bed to the diffusion drying chamber. As the space suddenly increases, the air flow rate also decreases, and the particles return. In the raw material container, the particles form a fluidized state in the raw material container under the action of the gas stream, and the pressure difference generated by the difference in the gas flow velocity between the spouted bed and the moving bed introduces the particles at the bottom of the moving bed into the spouted bed. As the material in the lower part of the moving bed continuously flows into the spouting bed, the material in the moving bed layer gradually falls down to form a circulating flow state.
The bottom spray gun is arranged at the bottom of the spouted bed in the center of the bottom jet flow distribution plate (also known as cocurrent spray in the same direction as the air flow), and the fluidized particles, pellets or tablets receive the coating material in the spouted bed. When the particles move up in the diffusion drying chamber and fall back down the moving bed, the excess water added to the liquid has evaporated. The bottom spray coating overcomes the disordered movement of the granules, pellets or tablets during the top spray coating operation, and overcomes the instantaneous drying of the liquid liquid during the spray coating to the material to form a discontinuous film. This leads to a large loss of the coating material, affecting the coating effect and the stability of the product quality.
The bottom spray gun is arranged at the bottom of the spouted bed in the center of the bottom jet flow distribution plate (also known as cocurrent spray in the same direction as the air flow), and the fluidized particles, pellets or tablets receive the coating material in the spouted bed. When the particles move up in the diffusion drying chamber and fall back down the moving bed, the excess water added to the liquid has evaporated. The bottom spray coating overcomes the disordered movement of the granules, pellets or tablets during the top spray coating operation, and overcomes the instantaneous drying of the liquid liquid during the spray coating to the material to form a discontinuous film. This leads to a large loss of the coating material, affecting the coating effect and the stability of the product quality.
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