SCANNING & OPTIMISATION – On the frontline
With the Tomolog measuring information we can decide at an earlier stage what is being produced starting from our
resources – Jimmy Hörnström, SCA project manager
The DiShape in action at SCA Tunadal
needs precaution,” Hörnström said. “At Bollstabruk, MiCROTEC has installed a 2 mm leading cover inside the scanning housing. In the room where the Tomolog is installed, a further 4 mm of lead has been installed on the walls. The infeed and outfeed are covered with a particular plastic with lead reinforcements. With these precautions, loss of radiation is simply not possible. In fact, no relevant doses of radiation have been measured out of the scanning station.”
Payment and production planning Payment still occurs based on the shape measurement but for the production planning, SCA can now use significantly more information. Pine has small annual rings and is ideal for producing of the following product line: • sawn wood for the parquet flooring (mainly for Scandinavia)
• sawn wood sold to Italian and Danish window manufacturers
• glued lamella for Japan post and beam- manufacturers
• sawn wood for the US market.
These final products have specific requirements, for instance sound knots. The position and the quality of the knots are reliably determined by Tomolog as well as the wood surface “under” the bark. With these data the 430 mm logs are sorted into 80 boxes.
“With the Tomolog measuring information we can decide at an earlier stage what is being produced starting from our resources,” explained Hörnström. “This increases the average value because out of the same resources we produce sawn wood of higher quality.” How much the average added
value has been increased has not been revealed. However, it is only by sorting based on wood-diameter instead of bark-diameter that yield has increased. At current production pace that would be around 4,600 m3
/year more pine sawn wood products.
Repeat accuracy is “phenomenal”
What do passionate technicians do with a new device? Testing without resting, according to the manufacturer. That was also the case with the Tomolog at Bollstabruk. In order to evaluate how accurate the measuring results are, 50 logs have been scanned by the x-ray scanner. And then one more time and then again – the technicians have run the tests eight times in a row to ensure a comprehensive set of data to compare. “The measurements confirm a phenomenally high level of accuracy,” Hörnström said. “The standard deviation is very low. We are really very satisfied with these results.”
26 International Forest Industries | FEBRUARY/MARCH 2012
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