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Here are the methods to determine if the spray gun is properly cleaned:

1. Visual Inspection

• Nozzle: Check the nozzle for any paint residue or blockage. If the surface of the nozzle is smooth and free of residues, it indicates proper cleaning.
• Paint Channels: Open the spray gun and inspect the internal paint channels for cleanliness, ensuring there is no significant paint residue.

2. Operational Testing

• Spray Test: After cleaning, perform a spray test to observe the spraying effect. If the spray is even and there are no drips or dispersions, it indicates effective cleaning.
• Color Test: Before changing paint types, spray a small amount of cleaning solvent (such as thinner) to ensure no previous paint color mixes in.

3. Cleaning Agent Check

• Cleaning Agent Residue: After using a cleaning agent, ensure there is no smell or residue left in the spray gun. If there is an odor, it indicates inadequate cleaning.

4. Equipment Performance

• Spray Pressure: After cleaning, check if the spray pressure is normal. If the pressure is stable and meets requirements, it indicates that the internal pathways of the spray gun are clear.
• Spray Pattern: Observe whether the spray pattern is consistent. If the spray pattern is normal, it suggests the spray gun has been properly cleaned.

5. Regular Maintenance Records

• Maintenance Log: Keep a record of regular cleaning and maintenance to ensure the spray gun is adequately cleaned and maintained during use.

By using these methods, you can effectively determine if the spray gun is properly cleaned, ensuring the quality and efficiency of the spraying operation.