A Pleat is a fold in the cover hook that extends from the cut edge downward toward the cover hook radius and sometimes below this radius in a sharp vee or spur.

A Pucker is a condition which is intermediate between a reverse wrinkle and a pleat, where the cover hook at the cut edge is locally distorted downward without actually folding.

A Spur is a localized irregularity characterized by a sharp protrusion at the bottom of the double seam. It is usually accompanied by a pleat or vee in the cover hook.

POTENTIAL CAUSES:

• First operation seaming roll set too tight.

• Worn or inappropriate first operation seaming roll.

• First operation seam too loose.

• Cover feed separator damage.

SUGGESTED REMEDY:

• Adjust first operation seaming roll tightness.

• Replace worn first operation seaming roll and/or install proper roll profile.

• Adjust first operation seam to proper tightness.

• Evaluate ends as they are being separated to determine whether curl damage is occurring in cover separation or through the cover guide rails. Check cover bell guides for proper setting.