FP - Hotfold

Classification 

  • A minor defect.

Identification 

A hot fold is a permanent bend in a seal, formed after sealing and before the area has cooled. This may appear as a large wrinkle or a fold that has been sealed over.

Causes 

  1. At the sealing machine, the plastic was folded while the pouch material was still soft.
  2. In the retort, the edges of the pouch were folded during the cook process.