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Increase productivity
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Increase productivity
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Reliable, robust log feeding stationHolzkurier report from Iggesund/Sweden |
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Logs arriving with small end first are turned with curve conveyor
Photo: KANZIAN
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A longtime Swedish Linck-customer is now also focusisng on the log feeding system of the German manufacturer. Sweden’s first Linck-line was installed in Iggesund in 1988. “The solid design and the good experience made with our sawline, also convinced us to invest in a log feeding station of Linck. The availability of the system is very high”, reports mill manager Lennart Svensson. “The first Linck sawline in Sweden was a little revolution. Since then, nine sawlines have already been installed”, explains Olle Eriksson from LOAB, Linck’s representative in Sweden. He is also responsible for the coordination of the project at Iggesund.
Reliable round log mechanisation
The Linck supply volume starts with the two debarking lines. At their outfeed side, the debarked logs are handed over to the longitudinal conveyor. The scanning system was supplied by Mictrotec, Brixen/Italy. “It checks whether the logs are in the proper position and if the diameter is suitable”, describes Eriksson. The two longitudinal chain conveyors operate at different levels. In case logs do not arrive with small end first, they are kicked onto the first cross conveyor. All other logs continue and are ejected at the second log kicker. Broken logs or faulty dimensions are transported into the special bin at the end of the sorting conveyor. Log kickers are hydraulically operated. The logs are taken over by the cross conveyors. A singulating conveyor cushions the ejected logs. Another cross conveyor takes the material to the roll case for even-ending them at the log line. The stop and loader is set to the optimum position according to curve and diameter and positions the logs correctly into the longitudinal conveyor.
Identical second line
The second line is built alike, however at a higher level. In front of the longitudinal conveyor towards the Linck sawline, the sawlogs are again deposited into the lower level. Logs whose small end position is not aligned correctly are kicked out into the depositing device. The logs are then further transported with the curve conveyor and arrive again at the stop and loader in front of the Linck profiling line. The cross conveyor are designed to allow a storage of the logs. Log diameters up to 40 cm can be processed at the Iggesund sawmill. The feed speed of the two debarkers is about 110 m/min. “The whole log feeding system is limited by this maximum feed speed”, explains Linck’s assembly supervisor Ernst Hauser.
Without production standstill
“What was special during the installation, the conveyors could be assembled without interrupting the production. The first stage could be taken into operation at an early stage”, Eriksson is pleased.
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Assembly supervisor Ernst Hauser (right-hand) and Wolfgang Jokiel carry out last checks.
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Two longitudinal conveyors operate at different levels – cross conveyors separate according to small- and large end diameter
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Logs are kicked out towards the bottom – cushioned via singulating conveyor
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Stop and loader for the Linck sawline – logs can be alternatively fed from left- or right-hand.
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Assembled in record time
“Although the time schedule was optimistic, we were able to install the mechanical, hydraulical and electrical equipment faster. Assembly started on May 30th. Start-up was scheduled for the 8th of August – as a matter of fact we already started operation on July 27th which was possible by the excellent cooperation of all companies involved as well as by the exact project planning. We managed to avoid losses of about 50.000 Euro per day”, Eriksson is pleased.
Speed increase
The sawline is operting in two shifts. Simultaneous to the log feeding station, the Linck sawline speed was increased from 110 to 150 m/min. The adjacent lumber sorting system was supplied by Springer, Friesach. “It is relatively simple to increase production of a profiling line. If it becomes necessary, we would be able to increase the feed speed up to 180 m/min.”, reports Eriksson. 220.000 m³ lumber/year are produced with a staff of 82 persons. Next year a production increase by 15 % is envisaged due to the upgrade. “In the future we focuse a further production increase”, says the mill manager.
High quality logs – exclusively pine
50 % of the logs, exclusively pine, come from the own forest enterprise. The Iggesund mill belongs to the Holmen group owning about 1 Million hectars of forest. Lengths from 3,60 to 5,90 m are purchased. “Earlier we also processed spruce. However, as our pine is of good quality, the demand for it raised more and more and so we exclusively specialized ourselves in this species”, reports Managing Director Håkan Lindh.
Around the globe
Our main sales markets are Sweden, Denmark, Norway and Great Britain. Iggesund is selling 80 % of its production there. In addition lumber is supplied to North Africa and the Middle East. “We recognize a trend towards the Do-it-Yourself business”, explains Lindh. Lumber is transported on truck and by ship. “We offer lumber with the certificates FSC and PEFC”, declares Lindh. The whole production is kiln-dried, 15 % of the lumber is kiln-dried to a moisture content of 8-10 %. “We are one of the leading companies with rgards to drying capacity and technology. We cooperated with the university and developed special drying methods”, reports Lindh. “We don’t have problems with blue stain, even in summer, as we look out for short processing times and controlled climate.”
High quality raw material and environmentally conscious
“We look optimistic into the future since we have high-quality raw material available. The log consumption within Europe will continue to raise and the environmental consciousness increased”, explains Lindh.
JK
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Circular resaw CSMK is splitting centre product and sideboards
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Håkan Lindh, Lennart Svensson and Olle Eriksson (from left) are pleased about the good cooperation and the fast project handling
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