Question

The process of removal of air, gasses from the filled food cans before seaming is termed as

• A. Exhausting
• B. Can seaming
• C. Retorting
• D. Pre-cooking

Hint:

Exhausting is critical because it:
1. Prevents can deformation during retorting.
2. Minimizes internal corrosion of the tin plate.
3. Creates a vacuum that pulls the can ends inward (concave) as a safety indicator.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Canning requires establishing an oxygen-free, partial vacuum inside the hermetic container to prevent can corrosion and oxidative degradation of food.

Step 2: Detailed Explanation:
The operation of removing air, oxygen, and other occluded gases from the can contents and headspace prior to hermetic sealing is called exhausting.
It can be achieved by:
- Thermal exhausting (heating the open can to expand gases and drive them out).
- Mechanical vacuum exhausting (physically sucking out the air using a vacuum pump).
- Steam-flow injection (displacing air with a jet of steam).
Retorting is the subsequent step of heat sterilization, and seaming is the sealing step.

Step 3: Final Answer:
The process of gas removal is called exhausting, which corresponds to option (A).