How to solve a problem like enamel rating

The traditional enamel rating process – used to detect holes and leaks in the lacquer layer of the can – is often unreliable. Innosen has developed a solution.  

Food cans have a lacquer layer inside them to protect the contents from spoiling and from damaging the can itself. An unlacquered can or a can with unreliable coating integrity could result in corrosion, which is caused by the aggressiveness of the content touching the bare metal. Corrosion could then lead to holes and leaks in cans. To prevent this from happening, companies rely on enamel rating. Enamel rating is a method of checking the integrity of the lacquer layer by measuring the conductivity of the can.

How does the process work?

The way to test the lacquer integrity of a can is through enamel rating with a voltage source of 6.3V. Operators fill the can with electrolyte, which conducts electricity to measure the current that passes through. If there is a hole in the lacquer or if the coating coverage is not full, the electrolyte will then touch the metal and conduct electricity, which will be shown in the gauge. The bigger...

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