Detecting perforations in products

Perforations in products can be detected using high voltage to create a spark through the perforation. Common application is testing the injection point of injection moulded products e.g. yoghurt cups, bottles and containers.

A special electrode can be placed under the product. Inside the product a ground electrode is placed opposite to the injection point. Even very small perforations can be detected that cannot be detected by vacuum or pressure systems.