Water chestnut coating machineThe coating of tablets, pills, and granules mainly used for compression molding in the pharmaceutical industry can be used for candy mechanism or coating in the food industry. The sugar coated tablets after coating and polishing have a shiny surface, which can prevent oxidation, moisture or volatilization, and can also cover up unpleasant odors, making it easy to identify drugs and alleviate their dissolution in the human gastrointestinal tract.

The common faults and corresponding solutions of the water chestnut coating machine in use are as follows:

1、 Coating quality issues

1. Uneven coating

Appearance: There are color spots or uneven thickness on the surface of the pill.

Reason: Unstable temperature control, uneven atomization of the spray gun, or poor quality of the chip lead to insufficient adhesion.

Handling:

Adjust the temperature of the hot air (recommended 40-60 ℃) and ensure even air intake;

Clean the spray gun nozzle and check if the atomization pressure is stable (usually 0.3-0.5MPa);

Optimize the core formula and increase the amount of microcrystalline cellulose to enhance the adhesion with the coating material.

2. Damaged or scratched film

Reason: Sharp edges and corners of the chip, complex engraving design, or insufficient hardness of the chip.

Handling:

• Use a double convex circular mold to reduce the impact wear between the core and the pot wall;

• Improve tablet hardness (brittleness control<0.8%) and reduce powder loss during the coating process.

2、 Mechanical malfunction

1. Abnormal vibration of the machine

Reason: Uneven ground, damaged tugboat bearings, or loose transmission components.

Handling:

Adjust the equipment to a level ground and tighten the anchor bolts;

Check the wear of the tugboat, replace dead bearings, and calibrate coaxiality.

2. The bracket of the spray gun is tilted/the round door is not tightly closed

Impact: Inconsistent distance between spray guns and abnormal negative pressure in the chamber.

Handling:

Strengthen the right door hinge and bracket connection bolts, and regularly calibrate the levelness of the bracket;

Clean the residue of the door sealing strip and replace the aging sealing components.

3、 Spray gun system malfunction

1. Spray gun blockage

Category:

Hanging beard blockage: residual coating liquid nozzle;

Membrane blockage: Drying too quickly forms a film that covers the spray hole.

Handling:

Immediately rinse the spray gun pipeline with solvent after each shutdown;

Avoid using the "cleaning gun" operation (which exacerbates blockage) and instead use ultrasonic cleaning to clean the nozzle.

2. Spray gun drip

Handling:

Check if the one-way valve in the air circuit is malfunctioning and replace the sealing ring;

Optimize the start stop timing of the spray gun and increase the delay in closing the air path.

4、 Auxiliary system malfunction

1. The blower is not working

Reason: Overheating damage or unstable power supply.

Handling:

Ensure smooth ventilation of the hot air duct and regularly clean the filter screen;

Install a voltage regulator and check the status of relay contacts.

2. Hot air temperature out of control

Handling:

Calibrate temperature sensors and replace faulty thermocouples;

Check the resistance value of the heating tube, and replace it if there is an open circuit.