Print Mark Detection on Label Foil via Contrast Sensors
In the packaging industry, products are packaged in tubular bags on horizontal packaging machines. For exact package sizes, black print marks are applied to the foils, which are detected by contrast sensors and control the cutting process of the foil packaging. The sensors detect the marks despite frequent batch changes and different color combinations on the foil. Thanks to the integrated contrast mode, the print marks can also be reliably detected on a patterned background.
Contrast Sensors
Contrast sensors with switching or analog output measure the brightness of objects. Sensors with switching output compare the brightness level with a reference value in order to detect contrast marking, for example. Sensors with analog output provide the measured brightness as a proportional voltage signal in order to monitor brightness curves, for example.
