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Checking Label Alignment and Presence of Print Markings in the Packing Process Using Versatile Contrast Sensors

Throughout high-volume manufacturing of confectionery, sealed cartons of candy are conveyed to a labeling station. Sensors are needed to test the label alignment and verify the presence of print markings as cartons depart the labeling area, rejecting any inappropriate cartons. 


 Photoelectric contrast sensors are suitable for this application. They supply a narrow optical beam that lets in detection of very small features. The choice of red, blue or green LED light guarantees most suitable contrast resolution.

A single sensor is installed near the conveyor. Its positioning is very simple. The transition from carton floor to label frame identifies the status and alignment of the label itself.

If the label is improperly aligned or the print markings missing, the sensor activates a reject mechanism. A working range up to 12mm lets in sufficient clearance between target and sensor, simultaneously the compact miniature PBTB plastic housing is mechanically vigorous and small enough.

Set-up is done either using a three-button keypad on the sensor, or thru IO-Link. These sensors are accessible with industry-standard push-pull 4-wire output. They are connected to the customer’s control system through a PVC-sheathed cable with the choice of an integral M12 connector or a hermetically sealed entry.

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