What the press says about LINCK
Detection of heart and sap wood by optical scanning
If a sawmill intends to increase its output, it appears obvious to process a larger quantity of logs. The French sawmill Bois et Sciages de Sougy however took a different route. With its new Linck sawline, the company increased its output by 20.000 m³ lumber per year without using more round logs.
In 2011, after 25 years of production, it was time for the owners of the sawmill Bois et Sciages de Sougy in the French Burgundy region to think about a new sawline. In addition to the tense economic situation, two new sawmills were installed in the same log collecting area. Therefore one could not expect cheaper raw material prices and a surplus of logs. This was the reason why the owners, the Monnet-Sève group, laid their attention to recovery and internal optimisation. “As it will not be possible to process more logs in the future, we should strive for better utilisation”. The ideal partner for realising their plans was soon found: the German manufacturer of sawmill machinery LINCK. Without changing the annual processing of 400.000 m³ of round logs, it was possible to increase lumber recovery by 20.000 m³ per year. The supply volume included a profiling line, a log feeding plant as well as the modifcation of the log yard for handling long and short logs.
Matter of the heart. As a first essential step to optimisation, Linck realised the automatic detection of heart and sap wood without using X-rays. Photos are taken from the log leading and trailing end for detecting the position of the heart and the area of the sap wood. These data can then be compared with the pattern created by the 3D-scanner and are then used for calculating the optimum cutting pattern. Core splitting and the production of core boards are possible. This differentiation is particularly interesting for the processing of Douglas fir which often results in bicoloured boards due to the red core wood and the white sap wood. Bois et Sciages de Sougy can now guarantee heart- and corefree lumber which allows a better utilisation of the core boards as construction timber. This filleting is realized by curve sawing, even with varying sap width.
Following the log shape. After scanning and calculation of the optimum cutting pattern, the logs pass the 100 m long sawline in 40 seconds only. First they arrive at the VM45 chipper canter where they are automatically rotated into their proper position. The two-sided cants produced by the first chipper canter are turned by 90° and fed to the secondary VM45 chipper canter. Active curve sawing provides a four-sided cant. Depending on the operating mode, also straight sawing, diagonal alignment or a split taper centre are possible. The second scanning system at the outfeed side of the secondary chipper canter supplies the data for the sideboard optimisation and compares simultaneously the measuring result with the one of the log scanner. Deviations may show possible problems in the sawline. The new Linck 6 scanning system is installed for determination of the curve produced by the chipper canter machine group. This scanner is equipped with a motion compensation supplying correct data even if the four-sided cant moves under measurement.
Diagonally profiled sideboards. After the second scanner, the four-sided cants are again turned by 90° and fed to the two profiler units VPM/N for diagonal profiling of up to two sideboards per side for recovery increase. All four sideboards can have different angles. A maximum angle of 1.5° is possible which corresponds to about 26 mm per meter log length. The following 4-axes saw unit CSMK 375-A2/B2 saws off the sideboards which are then separated and transported to the lumber sorting plant. After a third and final turning, the four-sided cant is transported to the next machine group again consisting of two profiler units VPM/S. The tool units of this type profiler can be pivoted to allow curve sawing. Sawing of sideboards and splitting of centre products are then carried out in the saw unit CSMK 325-A3/B3. With its cutting height of 325 mm and a total of six axes, this machne can split the products with utmost flexibility. In the first stage, the board packages are fed to the existing lumber sorting plant. A possible extension would include sideboard separation and centre product splitting with a horizontal circular split saw.
Interview with Stéphane Vives,
CEO of the Monnet-Sève group
Why did you go for a Linck line for Bois et Sciages de Sougy?
We had a clear idea of a plant which is capable to upgrade our logs and we had two well-known machine manufacturers complete against each other to achieve this goal. Our sawline must handle tasks which had never been required before. Linck was the company which met our requirements for optimisation and raw material utilisation best.
What do you like most about the new sawline?
The components of the machine supplies are of excellent quality and mechanically well-done. We are very satisfied with the plant capacity which is related with high speeds as well as with the scanning systems, the computer technology and the mechanical equipment. I particularly like the accuracy of the result. The sawline does what it has planned. The flexibility of the plant allows us to respond to the needs of our customers. Not to forget is the increase in reocvery.
What are the advantages of detecting heart and sap wood?
An upgrading of our raw material which allows us to serve new markets.
How do you assess the cooperation with Linck from the first contact to the after-sales service?
Excellent. From the sales team up to the engineering department – Linck listened to us and understood the tasks placed by Eric Schultz, Manager Mechanical Engineering. The assembly and start-up team on site were very competent and showed a very good performance despite the long construction time. A completely mastered start-up despite the introduced world novelties. Linck mastered the project until the end, solutions were found for all problems.
What species do you process?
Slightly above 50% Douglas fir, the rest is spruce/fir.
Where do you purchase your logs?
The logs are bought in a radius of 150 km – Burgundy, Beaujolais, Puy-de-Dôme, Limousin.
Where do you sell your products?
70% are sold in France, the rest is exported.
|Lumber production||420.000 m³/year|
|Species||48% fir/spruce, 52% Douglas fir|
|Location of the plant||Sougy-sur-Loire/France|