Patent ID: 7167803

Claim:
A container inspection method for inspecting quality of a finally shaped sealed container obtained by forming a web-like packaging laminated material having predetermined folding lines in tube shape, lapping both ends of the packaging material to form an overlap, longitudinally sealing the packaging material in the longitudinal direction to form an longitudinal seal zone on the overlap, filling food into the tube-shaped packaging material, pressing the packaging material at every predetermined interval in the crossing direction to seal the packaging material by the transversal seal to form a transversal seal zone, cutting at the middle of the transversal seal zone to obtain a pillow-like preliminary forming, and sealing flaps formed by folding along the folding lines to the container side wall and/or a container bottom face, comprising: rotating the flaps sealed to the container wall around a ridge side where the flaps integrally communicate with the container wall to peel the flaps from the container wall; returning to a shape of the pillow-like preliminary forming; cutting the container wall and squeezing out the filled food to prepare a sampled body; measuring electrostatic capacity and loss factor on said seal zone of the sampled body to inspect seal quality; measuring an overlap width on the seal inspected sampled body and unevenness on the external surface of the transversal seal zone edge on the inside of the container by an image processing unit to inspect the overlap width and the unevenness by image processing; arranging a first electrode at a distance from said seal zone of the sampled body; arranging a second electrode so as to contact said sampled body; and inspecting damage on the seal zone based on feedback current flowing on the second electrode.