Knockdown Flange

A knocked down flange typically occurs when a can body with a bent flange enters the seamer. Effectively this creates a false seam.

What this looks like using a double seam inspection system (SEAMetal & SEAMscan):

Possible causes of a Knockdown Flange:

• Bent can flange
• Damaged or bent end
• Mushroomed can flange
• Incomplete formation of can and end
• Filler or closing machine not properly timed