PROCEDE ET APPAREIL DE DETECTION DE PIQURES DANS DES FEUILLES DE MATIERE ISOLANTE

摘要

Non-conductive sheet material is tested for holes by applying a liquid under pressure to one side of the material. The liquid is used as one electrode and if any holes are present in the material passes through to make a conductive path with an electrode on the other side of the material. The current passing can be detected and used to operate a marker onto the sheet.