1. Visual Inspection
Inner Wall Condition: After cleaning, there should be no visible paint residue or stains, and the inner wall of the metal can should be free of rust or corrosion.
Bottom and Rims: Focus on inspecting corners such as the bottom and welds to ensure there are no lumps or buildup.
2. Tactile Test: Touch the inner wall with gloves; it should be smooth, not sticky, and free of any granular residue.
3. Solvent Residue Test: If solvents (such as acetone or thinner) are used for cleaning, rinse thoroughly with clean water to prevent residual solvent from affecting subsequent use.
4. Odor Test: After cleaning, the can should have no pungent paint or solvent odor, with only a slight detergent or metallic smell remaining.
5. Functional Test: For cans that will be reused, fill them with a small amount of clean water or new paint and observe for cloudiness, sediment, or abnormal reactions. 6. Professional Equipment Assistance
In industrial scenarios, ultrasonic testing or a three-dimensional rotating can washer can be used to ensure that no dead corners are left behind.
Precautions:
Avoid scratching plastic cans with metal tools to prevent scratches and stains.
After cleaning, dry the cans thoroughly to prevent moisture from rusting the metal cans or deforming the plastic cans.
