A system for making packs containing rolls of paper, the system comprising:
- an operating line including an upstream section for making the packs, a packing section where the rolls are packed;
- a conveying section by which the packs are transported between one section of the system and another,
- a top camera device including a camera positioned above the conveying section and being directed to take an image of a pack of the packs from above;
- a bottom camera device including a camera positioned below the conveying section and being directed to take an image of the pack from below;
- a side camera device including two cameras positioned on opposite sides of the conveying section and being directed to take respective images of the pack from opposite sides;
- a process control system for controlling functioning of the system sections, the process control system suitable for analyzing the images of the pack for determining at least one chosen from the following defects with respect to the pack:
- missing roll inside the pack;
- incorrect orientation of a roll inside the pack;
- defective lateral seal or lateral seal flaps detached;
- incorrect centering of printing on a film;
- defective lateral seal or presence of openings in the film or a wrapper on account of film melting or folding problems;
- defective underside transverse seal;
- paper ends trapped in the sealing zone between two sealed layers of film;
- missing or incorrectly positioned handle on the pack;
- the conveying section including an opening configuration for viewing a downward facing side of the pack, the opening configuration including corresponding rotating belts which are spaced apart, in a transverse direction transverse to a feed direction, to simultaneously engage the pack from opposite sides and feed the pack forward in the feed direction as the pack passes by the opening configuration;
- the conveying section including a supporting portion comprising a first conveyor belt and a second conveyor belt, the first and second conveyor belts providing an upward facing supporting surface on which the packs are supported, the first and second conveyor belts being spaced apart in the feed direction to provide a viewing opening therebetween through which an underside face of the pack is viewable;
- the rotating belts positioned to axially overlap the viewing opening to move the packs over the viewing opening;
- the camera of the bottom camera device being positioned below the viewing opening and being directed to take an image of the pack from below through the viewing opening;
- the camera of the top camera device being positioned above the conveyor belt and including a lens which is directed perpendicularly to the supporting surface;
- the two cameras of the side camera device including respective lenses which are directed parallel to the supporting surface, and
- the camera of the bottom camera device including a lens which is directed perpendicularly to the underside face of the pack through the viewing opening.