Cracked (broken) chuck

Chucks are a critical part of the seaming process.roll&chuck-with-shadow

A cracked chuck can come in two varieties:

  • Eroded chuck– typically caused by incorrect seamer setup that caused one of the rolls to touch the chuck. Over time, this type of erosion will crack the chuck in a uniform manner. Typically this will cause defects such as sharp seams.

Broken Chuck-cleaned

  • Cracked (broken) chucks will typically leave a mark on the seam:

cracked-chuck

this appears as a “bump” on a SEAM360 scan:

Broken Chuck 2