2017 International Forest Industries Magazines May 2017 SHOW Special | Page 47

HewSaw dx -Revolutionizing the This new four arbour dx sawing process from HewSaw provides major benefits for modern sawmills, including maximizing speed and recovery. HewSaw’s latest technology breakthrough was introduced in October 2016 and it will be showcased at HewSaw’s stand at Ligna 2017 in Hannover, Germany from May 22 to 26. HewSaw will have a cant saw with dx sawing on the stand and HewSaw representaves will be on hand to explain the new technology. You will find the HewSaw stand at Ligna in Hall 25, Stand D24. Based on the needs of today’s sawmillers, HewSaw’s in- house enginnering team developed the new dx Sawing at the company’s headquarters in Mäntyharju, Finland. It has been tested at sawmills in Finland and the USA and is now available to HewSaw customers worldwide. “When we equip our HewSaw sawing machines and sawlines with this patent pending technology, we can provide our customers with the ability to run larger diameter logs at faster speeds for longer periods of time, and we can reduce our saw kerf, increasing recovery and yield from each log,” explains HewSaw’s chief engineer, Raimo Karjalainen. Below: With HewSaw dx sawing, the saws are cutting through the cant in two stages, resulting in a reduced depth of cut. The basic principle behind dx sawing is to replace the standard double arbour sawing technique currently used by HewSaw with a four arbour system. The first set of arbours will house the saws for an initial or pilot cut into the cant, while the second set of arbours will house a set of saws that will finish the cut, just as it is in existing HewSaw sawing technology. This works well with HewSaw’s philosophy of centre line sawing where all processing is calculated and alligned to the centre line of the HewSaw machine. In a typical HewSaw dx sawing scenario, the log is presented in the usual way to the HewSaw scanning conveyor, and following scanning, it is then positioned for the HewSaw with the company’s highly accurate log positioner followed by four sided chipping. The next step is where it gets interesting, as the first set of saws penetrates part way into the cant, making the preliminary or initial cut. Then downstream is a second set of saws on a second set of arbours, which completes the sawing process. This is combined with the edging of sideboards to produce the highest efficiency possible in log breakdown.