Patent ID: 7317524

Claim:
Method for detecting surface defects ( 2 ), on a neck ring ( 3 ), of a transparent or translucent container ( 4 ) having an axis of revolution (X), characterized in that it comprises the following steps: illuminating, by means of an incident light beam ( 6 ), a section (s) of the surface ( 2 ) of the neck ring ( 3 ) of the container ( 4 ), along a determined incident direction (D i ), arranging a linear measuring sensor ( 10 ), along a determined direction of reflection (D r ), to collect the light beam reflected by the surface defect on the neck ring, the angle (α) between the incident direction (D i ) and reflection direction (D r ) lying between 15 and 45°, preferably in the order of 30°, one of these directions being parallel to the axis of revolution (X) of the container while the other direction extends along a plane (P) perpendicular to the radial plane (R), ensuring rotation of the container ( 4 ) about the axis of revolution (X) through at least one rotation, and processing the light beam received by the linear sensor ( 10 ), so as to create an image (I) and analyse the image to identify the presence of a surface defect corresponding to a bright area (b), wherein one of the reflection (D r ) or incident (D i ) directions is parallel to the axis of revolution (X) of the container while the other direction extends along a plane (P) perpendicular to the radial plane (R) of the container and parallel to the axis of revolution (X).