False Seams on a Can Seamer: Inspection and Corrective Action

Stop and isolate affected production. A false seam can result from damaged flanges or end curls, misassembly, poor cover feed, incorrect timing or worn seaming tooling. Use qualified visual and teardown evaluation against the can supplier’s specification.

Stop automatic operation, isolate electrical and pneumatic energy, close and depressurize product circuits, and follow the machine lockout/tagout procedure before opening guards or removing a valve. Quarantine product made since the last confirmed good check.

Locate the fault

• The cover and body hooks are not mechanically engaged
• Defects repeat at one seaming head
• Damaged end curls or knocked-down flanges appear before seaming
• Leaks or swollen cans occur in affected lots

Inspection sequence

1. Stop the affected seaming station and place product since the last good check on hold
2. Perform qualified visual examination and teardown using the container supplier’s seam specification
3. Map every defect to the seaming head and time
4. Inspect incoming can flanges, end curls and cover-feed handling
5. Check chuck and roll condition, profile and freedom of rotation
6. Verify lifter pressure, pin height and machine timing using the approved setup procedure

Corrective work

• Contain damaged cans or ends and correct handling that creates flange damage
• Restore cover-feed timing and can-to-end alignment
• Replace or correctly set worn seaming rolls and chucks
• Adjust lifter and pin-height conditions only by qualified seamer personnel

Operating records and follow-up

• Follow the required visual and teardown inspection frequency for the product and jurisdiction
• Inspect again after jams, adjustments and prolonged stops
• Trend seam results by head
• Protect ends from impact and contamination
• Keep tooling history and supplier specifications at the line

Equipment details: Can Filling Sealing Machine.