A dairy manufacturer was having an issue with their line that places the foil lids onto yogurt pots. They use a vacuum generator to hold the foil lid as it is placed on the pot. However the vacuum would stay live even if a lid wasn't picked up, causing product to be sucked up. This created an ingress which needed to be cleaned and the product batch would have to be scrapped. Sensing solutions proved to be costly so they sought alternatives. Festo proved to have a genius yet simple alternative that worked.
