Psycle
153 rue Robert Schuman
60610 Lacroix-Saint-Ouen

Fermer

The can

Boîte de conserve
Torn off / ripped label Faulty crimping Denting Folded label / air bubble under label

Torn off / ripped label

étiquette arrachée

A label tear is often visible from the top (protruding piece); a tear (or crack) is more likely to be seen from the sides. Treatment is facilitated by the presence of an area of the can not covered by the label (i.e. strong contrast at this point).

Faulty crimping

défaut de serti

There are different types of crimps, the finest being a few hundredths of a mm. The size of the smallest seam visible to cameras depends on camera resolution and the area to be observed (e.g. to have a minimum of 2 pixels representing the smallest defect, on a 100 mm diameter cylindrical box and 5MP cameras, a seam defect can be seen down to 0.1 mm).

Denting

boite cabossage

A dent is represented by a break in contrast, easy to see from the front, but more complex from the sides (particularly in the case of highlighted, unlabeled cans). If the dents can be fine, a total of 6 cameras (one every 60°) may be needed.

Folded label / air bubble under label

boite étiquette plissée

A fold is finer to see than a tear, especially if it can be mistaken for a box decoration. You'll need to present different manufacturing orders to the system to help it adapt and differentiate between folds/air bubbles and decorations resembling them.

Objectif caméra

Optical features

How to ensure good visibility of defects

The can has complex optical properties that must be taken into account in any defect detection system.


Brilliance: this product reflects light strongly, requiring the use of polarizers (both on the lens and on the lighting).


Sharpness: cans are often used in their cylindrical form. In front view, the depth of field (sharpness range) must be maximized to see clearly both the closest point (in the center) and the furthest points (towards the edges). To maximize depth of field, we need to minimize aperture, but we also want to minimize exposure time (otherwise, motion blur). Strobe lighting is therefore the best choice.

Vision 360 degré

Optical integration

360° can control

Cylindrical cans can be rotated on themselves.


This lends itself particularly well to low production volumes, as each product has to pass through a rotation station.


If this isn’t possible, or for cube-shaped cans, you’ll need a control station large enough for 360°: 4 cameras that scan 90° each, with a minimum spacing between two cans equivalent to one can diameter.


For 100mm diameter cylindrical boxes, allow 800mm for the control station footprint.

Keep an eye on your production lines, thanks to vision machines that are reliable, scalable and easy to use.