FP - Delamination

Classification 

  • A major defect if in the seal area, or when delamination, anywhere in the inner or outer plies of the pouch, is in excess of 1 cm2 (or equivalent area).
  • A minor defect if outside the seal area, or when delamination, anywhere in the inner or outer plies of the pouch, is less than 1 cm2 (or equivalent area).

Identification 

Delamination is a separation of the laminate materials. This can occur anywhere on the pouch.

Causes 

  1. If at the seal, the bars were too hot during the seal formation.
  2. If located elsewhere on the pouch, the material bond strength is inadequate.
  3. The residual air in the retort pouch was not properly controlled to eliminate sharp corners on the edge, which would make the pouch expand during retorting.