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.

knock-down

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

knock down flange

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
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