Canning and Fish Packaging Technology

Unit 5 - Changes in canned foods and spoilage

5.2.1.1. Flipper

In this pressure inside the can is equal to the atmospheric pressure (Vacuum ‘O’) or inside pressure is slightly higher than atmospheric pressure and this excess pressure is equal to resistance of can end. When such a can is hit on the table, the can end flips out and becomes convex. Where the convex end is pressed it becomes flat again. The reasons for this spoilage are,

• Under exhausting
• 1st stage of H₂ production
• 1st stage microbial activity
• Pre-processing spoilage of food