PIN HOLE INSPECTION METHOD FOR SEALED FOOD PACKAGING CONTAINER

摘要

PROBLEM TO BE SOLVED: To provide a pin hole inspection method for sealed food packaging containers which can detect pin holes existing on sealed food packaging containers formed of laminated sheets in which a metal foil such as aluminium is sandwiched with high precision and efficiency. SOLUTION: The pin hole inspection method for sealed food packaging containers which are formed of laminated sheets in which a conductive layer such as aluminium foil is sandwiched between resin layers is characterized by the presence or absence of a discharge current which can be detected through the contact of a grounded electrode with the conductive layer such as aluminium foil in the sealed food packaging container, and the application of voltage between the grounded electrode and a detection electrode which is in contact with or placed near the surface of the container. COPYRIGHT: (C)2004,JPO