On the frontline – SCANNING & OPTIMISATION
“Many improvements have been made to this technology over the years and today the reading accuracy is above 99%,” stated a satisfied Autolog. “Each of the Autolog planer optimisers are now supplied with a top/bottom, triple side-by-side print nozzle so three identical codes are printed on each side of the board. A code reader is also supplied with a top/bottom camera so the accuracy of the system is not affected by a board flipping over in the process or by any others defects – split, knot, rot etc.” At the other end of the spectrum, with over 20 years of experience in optimisation and controls for the wood industry, Autolog is a world leader in board transverse optimisers. The system proposed to the Chilean was a newly redesigned version with the best technology and innovations available today. The sensors are mounted at a 45° angle with the flow so all four sides of the boards are scanned thus improving the edge detection. Also with the sensors at such an angle, the cleaning process is reduced by more than 50%.
High speed sensors (3,000 scans/s) and high density (6.35 mm) scan profile allow for higher board accuracy. The scanner frame is designed in such a way that each sensor can be moved sideways to fit with the chain location. For that project, one of the customer requests was to run fixed and random board widths at the same time on the line and this feature was already available in the new optimiser version. A Windows 7 operating system,
SQL data server, simulation package, Web browser style interface with 625 mm HD monitor, wireless user’s interface, industrial computers are among the standard features offered with the Autolog transverse optimiser. In the concept of the Chilean mill, all the boards going to one of the edger lines ran through the trimmer optimiser first so the Autolog engineers set-up the trimmer system with two independent optimiser computers – one running a trimmer and the other an edger application. So,
FEBRUARY/MARCH 2012 | International Forest Industries 19
when a board is scanned, the board data are transferred to both computers for analysis and each system generates a solution. When the best solution is for a trim, the system operates as a conventional trimmer optimiser and the solution is sent to the
trimmer PLC, which controls the paddle fence gates, the trimmer saws and the sorter bins. If the best solution calls for an edger board, then the edger computer stores the solution data in a buffer and an ID number is associated to that solution for a
transfer to the edger controller. The edger optimiser computer is set-up with the exact same mechanical characteristics as the edger line so the solution can be applied without any compromise. An ultra violet printer located about 20 lugs downstream from
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