False Seam
Visual Double Seam Defects - Cause & Remedy

This is a condition where the cover and body are not hooked together but each are folded over against themselves and compressed together.

False-Seam False Seam
Probable Cause Suggested Remedy
Bent or knocked down can flange Determine if the can is damaged before or after entering the seamer. If the can is damaged before the seamer, check can handling equipment to insure that cans are entering the Filler properly. Check for Mushroom Can Flange (pg. 22). If the flange damage is occurring in the seamer, check timing between the Cap Feed Turret & Seaming Turret pockets. On 41L, 61 H, 62H, 80L, 81L, 100L, 101L, 120L, 121L, 140S & 180S Seamers; Check position of the can feed & discharge Rail. If the rail is positioned too far in back of the pocket at makeup, the can will rise pushing the can flange into the the Can Flange Guide mounted on the Cap Guide Section Outer. Refer to your Service Manual. Check Cap Guide Rails to insure that the can rises through without interference.
Flattened or damaged cover curl Check Separator Knives or Discs to determine if the damage is occurring at this point. Adjust Separator Knives & Discs to provide smooth cover transfer without any binding. If the cover curl is damaged here, then there is more then likely a cover feed problem resulting in jams.
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.
Mis-assembly of can and cover See Knocked Down Flange or Mismatch