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Multifunction line (Holzkurier 34/2005)
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Multifunction line (Holzkurier 34/2005)
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Fast response in the family business
Holzkurier report from Bygdsiljum/Sweden |
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Operator with view to the round log feeding station - Linck sawline is shown on screens
PHOTOS: KANZIAN; GRAPHICS: LINCK
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The Swedish family business Martinsons, Bygdsiljum/SE, offers a wide range of products – lumber, glue-laminated timber and multiply panels.
"Our familial constitution allows to come to fast decisions. Our philosophy: Markets change and we can keep up with", reports production manager Olof Martinson. He continues: “To increase our productivity is the order of the day”. Therefore extensive investments were made in the renovation of the Bygdsiljum sawmill. “The amount of 17 Million Euro is one of the most important investments in Sweden in recent years”, declares Martinson. With regards to the sawline, Martinsons focused on the profiling technology supplied by the company LINCK located in Oberkirch/Germany. A chipper canter-bandsaw line was operated so far. “Various reasons were the determining factors to decide for the LINCK profiling technology: The company enjoys a good reputation, supplies in time and production started on schedule. Size stability as well as flexibility with high availability were very important factors”, reports Martinson. Senior director Nils Martinson is pleased: “I am impressed by the lumber accuracy of the new sawline” and Olov Martinson explains: “Last but not least due to the good optimising result we decided in favour of the German supplier.”
Nordic round logs of high quality.
Round logs are purchased within a radius of 200 km. The annual processing capacity is 400.000 m³ round logs, whereof 60 % spruce and 40 % pine. Spruce is used for producing glue lam and multiply panels. Parallel to the sawline modernisation, even the log feeding and the following sorting station were designed for the larger log quantities. The new debarker was supplied by Valon Kone, Lohja/Finland, the log feeding station from Tähkä, Kaskinen/Finland. Renholmen at Byske/Sweden supplied the lumber sorting and Bruks Klöckner, Arbrå/Sweden the removal system for by-products. Prior to processing, the round logs are classified in A- and B-quality. The cutting pattern to be processed is chosen according to size, shape and quality from a table of options stored in the line setting controls. The sawline operates in two shifts with a feed speed up to 150 m/min. Top end diameters from 11-45 cm are processed.
Full optimisation for main products and side lumber.
“This plant is completely high tech, it is really an allrounder”, reports Linck’s assembly supervisor Ernst Hauser. “New developped servo technology and exact scanning results as well as short response times of the aligning- and positioning sytems result in a high flexibility of the line. Also the optimising software plays an important role”, explains Hauser. The centering system is already positioned prior to entering the log into the machine. Even the outfeed system is pre-positioned. “This requires a relatively small log gap in order to carry out all operating modes”, declares Olle Eriksson from LOAB, Linck’s Swedish representative.
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Precutting chipper canter in the new sawmill building
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Family business with tradition: Presently the fourth generation is to the fore.
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A new type of VM 45 chipper canter is used allowing an easier tool change. The chipper canter moves to its outer position, the cant support is hydraulically pivoted and serves as assembly platform. Tools can so be changed standing. “The newest stepped cutterheads are installed. We do no longer use segments, but a closed saw ring resulting in a better surface quality”, says Hauser. Martinsons presently use Kanefusa tools. “By installing the chipper canter separate from the outfeed system, the surface quality can be improved again as the machine is not exposed to forces of any kind”, explains Hauser.
Flexible sawing and high availability
The round logs are measured by the 3D-scanner supplied by Microtec, Brixen/Italy. The sawlogs are centred and transported to the first chipper canter. The infeed system positions the logs according to their curve (bow down). Following the chipper canter, the two-sided cants are turned by 90 degrees. The camera installed in front of the second chipper canter monitors the sawline. The second chipper canter VM 45 now produces four-sided waney cants corresponding to the cutting patterns. Different operating modes are possible, e.g. passive/active curve sawing, even diagonal alignment. The 3D-scanner determines the shape of the cant surface as well as the center product position relatively to the two-sided cant and controls the optimum cant position in the chipper canter infeed via the evaluating logic. Alternatively to a split taper centering, irregular shaped cants are assymetrically or diagonally aligned to the centre line by means of the optimising programme to produce an advantage in centre product and side lumber volume.
Scanning and additional optimising
A curve scanning is carried out after having turned the waney four-sided cants for checkup. These data are also used for sideboard optimisation to set the following machine groups. Alternatively to a fix profiler setting for constant sideboard width and –position, the optimising system also provides the possibility to position the profilers from cant to cant according to the optimising criterias. Here the shape of all four cant sides is collected and the sideboard position and width is defined by the optimising programme. Depending on the board position and usable board width, the profilers are positioned from cant to cant. Following a preceding optimisation, the sideboards are separated by the circular saw CSMK. Thereafter main products are separated and sideboards are transported to the lumber sorting station via belt conveyor. The remaining four-sided cant is turned and arrives at the pre-positioned, adjustable infeed system in front of the profiler unit VPF for curve profiling. The circular resaw CSMK splits the main products and sideboards with six adjustable axes. Sideboards are separated and main products are transported to the sorting stations via various roller conveyors.
Future investments
Future investments will include drying kilns. “The increased capacity also requires a higher drying capacity. We see our future clearly in the further upgrading of our products, e.g. the production of glue-laminated timber and multiply panels. These products will develop well”, explains Olov Martinson.
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Circular resaw CSMK splits main products and sideboards
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Further developed profiler unit for better chip quality
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Sideboards are transported to the sorting station with a belt conveyor.
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