FP - Swell (Swollen Package)

Classification 

  • A critical defect.

Identification 

The pouch bulges due to gas formation from bacterial contamination, or excess internal residual air.

Causes 

  1. The pouch was overfilled or a proper vacuum was not drawn, which resulted in an improper thermal process.
  2. The pouch leaked after processing.
  3. The pouch was under-processed.
  4. There was insufficient chlorine in the cooling water.
  5. The post-process handling was too rough.