A Short Cover Hook is a condition where the cover hook does not meet the minimum recommended specification.

POTENTIAL CAUSES:

• Deep countersink limits the amount of metal available for cover hook.

• Loose second seaming roll setting.

• Worn first operation seaming roll groove.

• First operation seaming roll groove profile incorrect.

• Long body hooks.

• Worn first operation seaming roll bearing or seaming roll pin.

• First operation seaming roll set too tight or loose.

• Insufficient seaming stock.

SUGGESTED REMEDY:

• Reset chuck to roll relationship on first and/or second operation rolls.

• Tighten second operation seaming roll.

• Replace first operation seaming roll.

• Replace first operation seaming roll with proper groove profile. See your can manufacturer’s Top Double Seam Guideline.

• Reduce spring pressure of lower lifters and/or adjust pin height to proper setting.

• Replace worn seaming roll bearing or seaming roll pin.

• Adjust first operation seaming roll for appropriate tightness.

• Discuss with end manufacturer.