The Leak Testing process

The Leak Testing process

Vacuum testing of metal containers is a critical step in quality control, as adequate vacuum is essential for product preservation and to avoid microbiological contamination. There are different methods to check the tightness and vacuum level of containers:

Leakage tester: This machine checks the good tightness of 100% of the production and rejects defective cans. There are two types of tester: pressure and vacuum. The process involves introducing pressure or generating a vacuum inside the closed container, taking a pressure measurement and storing it. At the end of the process another measurement is made and the values are compared. If the difference between the two is greater than a predefined value, then the pot will be rejected.

Manual Check: The tightness of the container can also be checked manually by submerging the cans in water to detect air leaks.

Vacuum detectors: It is recommended to install vacuum detectors in the line after processing so that containers with low or no vacuum levels are eliminated. Regular examination of all containers ejected by the vacuum detector should be carried out to establish the reasons for failures and take appropriate corrective action.

Visual examination of the lids: If the lids have a “safety button”, this can be an indirect way to control the vacuum inside the jars.

These methods help ensure that metal packaging maintains the integrity of the packaged product and meets food safety and quality standards.