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Parameter monitoring of continuous loop strap for cable ties

It is essential that the “width” and “height” of the cable tie strap, as well as the “tooth pitch” are monitored concurrently and constantly during the production of the continuous loop straps. These values are crucial to ensure a consistently good and reliable binding result. HellermannTyton GmbH therefore relies on a solution from ISW GmbH that uses a Micro-Epsilon sensor system to monitor the parameters.

Cable ties are manufactured in the most variegated shapes and continuous loop straps for automated applications. The continuous loop strap and fastening heads are combined from their separate dispensing devices. The strap is guided around the item to be bound and cut to length, and the fastening head is added from the dispenser and connected to the strap.

Monitoring of specific parameters such as width and height of the cable tie strap and the tooth pitch during the entire process is pivotal in ensuring the quality and uniformity of production. The measurement is performed using a sensor combination of two laser micrometers and a laser sensor which are attached behind the extruder. Two ODC 2520-46 micrometers are positioned both horizontally and vertically and measure the height and width of the strap. The optoNCDT ILD2300-2DR laser sensor measures the tooth pitch from above. ISW GmbH implemented the arrangement of the sensors in a compact structure with adjustable strap guiding. The data measured are analyzed using the interface programmed by Micro-Epsilon system partner ISW GmbH via a port. Recording the extrusion speed, which must be congruent with the measuring sensors, is the challenge in this application.

The combined measuring system, consisting of optoCONTROL and optoNCDT, provides extremely reliable and reproducible measurement results. In the final analysis, this accelerates the optimization process, and reduces waste and errors during manufacturing.