Review of Labelexpo Europe

Review of Labelexpo Europe: The 200% printing inspection was a great success

Erhardt+Leimer stands out through its new technology and sells almost 30 SMARTSCAN camera systems

Even before the fair, Erhardt+Leimer had announced the new "200% printing inspection" technology for the Labelexpo. The interest of the specialist audience in the SMARTSCAN system for quality assurance in the label industry was thus appropriately great. "Of course, many visitors wanted to know if it was just a publicity stunt and what was really going on with them," explains Alexander Thomalla, Product Manager at E+L.

Which technology is used?
By 200% inspection, the camera experts at E+L actually do mean that the web is inspected twice. However, here, twice does not mean that a second camera is used. It is rather that the images of the web are captured with two different illumination methods and then evaluated. The double image capture means that defects in the material or printing can be detected that are not visible using classic incident illumination (100% inspection).

These defects can, for example, be white unremoved matrices on a white carrier material, which may remain undetected without the use of a special camera during matrix stripping. Thanks to the double inspection, it is now even possible to detect defects located on the rear side of a label. In this case, it is about detecting pockets of dirt, insects or also damage. The benefit becomes even clearer in the case of splice point detection. Usually, a splice point can be recognized easily on the front side of the carrier material. However, splice points are typically located on the rear side of the material, meaning that they are invisible to a classical 100% inspection.

Double image capture
The 200% inspection system contains a second lighting unit behind the web. However, this is not a special feature. The real difference lies in the double image capture. Thus, two images are captured in succession at full production speed: One is only illuminated from the back and the other from both front and back. Then, both images are evaluated in sequence and checked for defects. "The background image is thus simply a contrast image. This means that the classic incident light inspection is supplemented with a transmitted light inspection," summarizes Thomalla.

"With this technology, we are setting a new benchmark in quality assurance," says Dirk Schröder, Head of Sales at E+L for the Printing/Foil field. "The benefits now offered by SMARTSCAN became so tangible to our customers that, during the four days of the fair, we were able to sell almost 30 SMARTSCAN systems." It has thus become clear to the customers that SMARTSCAN can detect defects which standard 100% inspection systems "miss". According to Schröder, the simple one-touch operation and the convenient implementation of new software functions were also very well received.


Download: Review of Labelexpo Europe