Fluidized bed coating for clean room engineering
Fluidized bed coating for clean room engineering
Clean room fluidized bed coating machine, the air gets clean, high temperature airflow after passing through the air inlet treatment system, the airflow pushes the material to suspend to form a fluidized state, and then sprays the atomized coating liquid to wrap it on the surface of the material, Forms a tightly adhering film after drying, coating repeatedly until desired...
Text Labels: Cleanroom Engineering, Fluid Bed Coating
Fluidized bed coating for clean room engineering
Clean room fluidized bed coating machine, the air gets clean, high temperature airflow after passing through the air inlet treatment system, the airflow pushes the material to suspend to form a fluidized state, and then sprays the atomized coating liquid to wrap it on the surface of the material, After drying, a tightly adhered film is formed, and the coating is repeated until the required thickness; the exhaust valve and the shaking bag cylinder in the collection chamber alternately act periodically to clean up the powder adsorbed on the left and right filter bags respectively, and the end dust collector further Deals with fine dust that penetrates into the exhaust air. The core structure of the fluidized bed coating is the bottom spray device of the Wurster system. There is a spacer in the center of the material tank, and an air distribution plate with many small holes at the bottom. Different air intake airflow intensity; negative pressure generated by high-speed airflow in the spacer, the material moves from the gap between the spacer and the air distribution plate to the spacer and is thrown by the air flow, the spray gun is installed at the bottom of the spacer, and the spray direction is the same as that of the spacer. The material moves in the same direction. After the material is coated in the spacer, the material moves to the diffusion chamber for drying. The airflow here cannot push the material to rise, and the material starts to slow down and finally falls back to the material tank to enter the next cycle.
The process of fluidized bed coating is to adjust the balance between drying efficiency and spraying efficiency on the basis of fully understanding the characteristics of the formulation materials, so as to achieve a material temperature most suitable for coating film formation, and the adjustable process The parameters include material volume, spray speed, air volume, air inlet temperature, drying time and temperature, etc. The spray efficiency is usually limited by the viscosity of the coating liquid and the atomization ability of the spray gun, and the adjustability of the atomization ability of the spray gun is It is very large; the coating liquid is atomized into fine droplets by compressed air. In addition to the properties of the coating liquid itself, the atomization pressure and atomization gas volume are the determinants of the size of the droplets. When increasing the spray speed during the coating process, The atomization pressure also needs to be increased accordingly to maintain the same droplet size. During the coating process of the aqueous dispersion, the material temperature is usually 10-15°C higher than the film-forming temperature. The polymer particles cannot be deformed and fused to form a film at a low film-forming temperature, otherwise cracks may appear in the coating film. Keeping the material temperature constant from pilot to scale-up is the key to success. Zhongjing Global Purification can provide consulting, planning, design, construction, installation, transformation and other supporting services for clean clean room modular and clean workshop projects.
Inlet air humidity control: Too high humidity reduces drying efficiency. Too low humidity may cause static electricity problems. Therefore, dehumidification and humidification devices should be configured to keep the inlet air humidity consistent in different seasons. Usually, the inlet air dew point is controlled at 8-10 ℃ or so. The air handling unit, the main engine, the dust collector and the fan can be connected by air ducts. Silicone gaskets are added to the connecting flanges, and the bolts are tightened to ensure the sealing of the ducts. The air collection and exhaust ducts of the system are generally led to the outdoors according to the plant structure, and should not be too long. so as to affect the wind pressure. The high-speed liquid spray system adopts a new high-speed spray gun. The spray speed is 3-4 times that of the ordinary one, usually reaching 400-500g/min. It makes full use of the drying efficiency of the fluidized bed. The spray gun is designed with a jacket to prevent the material from contacting the nozzle part Inadequate atomization of the coating liquid causes gun blockage and avoids entry into the high-velocity area of u200bu200bthe compressed air causing wear.
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