Two synchronized cameras image the ends of the cut product (tread, sidewall). The edges are detected in the image with the aid of a special algorithm. The length of the measured tread can be determined by the length measurement system on the basis of the prior calibration of the two cameras to each other.
The length measurement system is used at the end of the extrusion line for quality documentation and for sorting out material that is outside the tolerance limits.
The EL-Length measurement system is installed after the skiver. Due to material shrinkage, it is recommended that the measurements are taken as close as possible before the booking station. Only at this point has the tread almost reached its final length.