Test Machine: Start up the film coating machine and verify that all operational functions are working properly. Ensure that the machine stops correctly after testing.
Stirring: Take the prepared film coating solution and pass it through a 100-mesh sieve before pouring it into a blender. Mix for approximately 40 minutes to ensure uniform consistency.
Adjust Flow Rate: Position the spray gun at a fixed location outside the coating pan. Turn on the compressed air supply, close the atomizing gas valve, and activate the infusion pump. Adjust the flow rate of the second spray gun (or multi-head spray gun) to match the first one, then turn off the pump.
Adjust Atomization: Re-activate the infusion pump and open the atomizing air valve. Fine-tune the atomization process to achieve the best spray quality, then shut off the compressed air and the infusion pump.
Loading: Based on the capacity of the coating pan, add the appropriate amount of core material into the pan. Move the spray gun inside the pan and adjust the distance between the spray gun and the core to fix its position.
Preheating: Set the temperature to 45–50°C. Open the coating pan and allow the core to tumble slowly—ensure the rotation speed is just enough to keep the cores moving. Turn on the hot air and vacuum cleaner to create a slight negative pressure, which helps heat the core while removing any fine particles or dust. Continue until the desired temperature is reached.
Spraying: Increase the rotation speed of the coating pan to the optimal tumbling condition for the core. Activate the compressed air and the infusion pump to begin spraying. Adjust the flow rate based on the core's characteristics. For a standard batch of 50 kg, a typical flow rate is around 200 ml/min. Gradually increase the flow while maintaining a balance between the flow rate and temperature. Once the preset temperature is reached and stabilized, continue spraying until the coating meets the required quality standards.
End: When the coating quality meets the target, gradually reduce the temperature and allow the system to cool down slowly. Stop the spraying process, turn off the hot air after about 2–3 minutes, and then switch off the vacuum cleaner and the coating pan. Finally, release the coated product from the machine.
Author: Chang Hong Medicine Machine
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