Knocked Down Flange

Visual Double Seam Defects - Cause & Remedy

A condition similar to a False Seam.

Knocked Down Flange Knocked Down Flange Knocked Down Flange
Probable Cause Suggested Remedy
Can flange damaged in can handling systemDetermine 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. If the flange damage is occurring in the seamer, check timing between the cap Feed Turret & Seaming Turret pockets. On 41L, 61H, 62H, 80L, 81L, 100L, 101L, 120L, 121L, 140S & 180 Seamers; Check position of the Can Feed & Discharge Rail. If the Rail is positioned too far in the back of the pocket at makeup, the can will rise pushing the can flange into the Can Flange Guide mounted on the Cap Guide Section Outer. See your Service Manual for procedures. Check Cap Guide Rails to insure that the can rises through without interference.
Align Cap Guide Rails to eliminate binding of the cover and can flange.Align Cap Guide Rails to eliminate binding of the cover and can flange.
Cap Feed Turret & Can Feed Chain Finger are out of time with the Seaming TurretAdjust alignment between the feed Turret and Seaming Turret first. Adjust position of the Chain Finger to within approximately 3/32 of an inch behind the can body at the makeup area.
Can Feed & Discharge Rail improperly alignedOn 41L, 61H, 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 Guide mounted or machined onto the Cap Guide Section Outer.
On 60L seamers, 1st & 2nd Operation Seaming Rolls are sluggish in returning to their offseam position, letting the lower lip of the Seaming Roll make contact damaging cover curl & can flange while on the rise up to the Seaming Chuck.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.
Improper Cap Centering Cam alignment.The Knockout Rod w/Pad height should be adjusted to lightly control the can & cover while on their rise onto the the Seaming Chuck. Radial adjustment should be set to follow the same rate of incline as the Lower Chuck Cam.