Visual Double Seam Defects - Double Seam Troubleshooting Guide

The next few pages are examples of Double Seam defects seen visually or felt by hand. Good judgement and experience with Double Seams will save a lot of time if defects are spotted immediately. Visual inspection of Double Seams should be made frequently and on a scheduled basis. Cross section and Tear down of the Double Seam for component inspection follow this section of Visual Defects.

Wooling

Wooling or sometimes called 'Slivering' is a condition that is more predominant with aluminum beverage...

Vee

A Vee, or sometimes called a Lip or Spur, is similar to a Droop only...

Sharp Seam

This is a condition where the seam has a sharp edge around the top inside...

Mushroomed Flange

A Mushroomed Flange is a can flange that is over formed, resulting in a long...

Mismatch

A Mismatch or Mis-Assembly is the result of the can and cover never getting settled...

Knocked Down Flange

A condition similar to a False Seam. Probable Cause Suggested Remedy Can flange damaged in...

Jumped Seam

A Looseness in the seam approximately ½ inch from the soldered lap or cross over....

False Seam

This is a condition where the cover and body are not hooked together but each...

Droop

A Droop is a small portion of the seam that extends below the bottom edge...

Dead Head or Skidder

A condition where the 2nd operation seam is not finished all the way around the...

Damaged Cover Curl

A Damaged Cover Curl is a condition where the curled portion of the cover gets...

Creasing

Creasing or sometimes called Scoring, is predominantly related to aluminum necked in beverage cans with...

Body Buckling

Body Buckling can occur anywhere up and down the can body depending on tin plate...

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