Damaged Cover Curl
Visual Double Seam Defects - Cause & Remedy

A Damaged Cover Curl is a condition where the curled portion of the cover gets flattened in at one or more spots causing the cover curl to fold back on itself rather than tuck up under the body hook.

Damaged Cover Curl
Probable Cause Suggested Remedy
Covers damaged in handling or shipping If covers are delivered in tubes or bags, the first or second cover on either end of the bag or tube may get damaged in the handling or shipping. The seamer operator should watch this very carefully when loading covers and scrap all damaged covers. The seamer operator should be extremely careful when loading covers so not to drop the stack of covers. If the stack is allowed to drop it may bend over the curl on the bottom cover resting on top of the Separator Disc.
Improper timing or adjustment of the Separator Disc to the Cap Feed Turret. Timing between the Seaming Turret & Cap Feed Turret must be correct. Check timing from the moment the cover is released from the Separator until the Feed Turret Cap Pusher makes contact. The cover requires some lead time here to settle before the Cap Pusher makes contact. See Service Manual for procedures.
Improper alignment of Cap Guide Rails. Check alignment of Cap Guide Rails at makeup to insure that the can is centered with the cover. Check for cover curl clearence all along Cap Guide Rails vertically and horizontally.
On 60L & 41L Seamers, 1st or 2nd Operation Seaming Roll is sluggish in returning to their offseam position, allowing the lip of the roll to damage the cover curl as it is lifted into seaming position. The 60L & 41L Seamers are designed with an Open Seaming Cam versus a box type on other seamers. Free movement of Steaming Lever Shafts is important. Check Seaming Lever Shaft endplay in the Upper Turret. The 60L should have approximately .005 of an inch endplay. The 41L should be approximately .002 to .003 of an inch of endplay. Check for broken or missing Seaming Cam Lever Return Springs. Replace if necessary.