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Compact, efficient and high-performing (Holz-Kurier issue 51/52 dated 2009-12-17)
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Compact, efficient and high-performing (Holz-Kurier issue 51/52 dated 2009-12-17)
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Chipper canter-circular saw line for variable/flexible sawing
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The existing chipper canter line was no longer up to date. Therefore the owners of the sawmill Decker-Frères in Betrambois/France decided to invest in a new chipper canter-circular saw line from Linck in Oberkirch/Germany.
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The objective of the investment was to increase the availability compared to the existing saw line and to minimize the time spent on operations scheduling. Despite the higher investment costs, but due to the good technical solutions, Managing Director Manuel Decker decided for Linck – and is very satisfied after the first months of operation. |
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Satisfied customers in front of the new saw line :
Manuel Decker, Martin Huber and Patrick Decker (from left)
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Short modification time
In May 2009 Linck started the supply of the equipment to Bertrambois/Lorraine. The Linck chipper canter-circular saw line was installed in a new sawmill building. Only after having shut down the old equipment, the new machines could start operation. As the company Decker wanted to keep the loss of production as short as possible, a rather tight time schedule was determined for the modification of the saw line. End of July 2009, the existing equipment was dismantled. « We had to install the log feeding plant as well as the conveyors to the existing board edger plant within four weeks. On August 27, 2009, one week before the envisaged start of the line, the first log could be processed on the new chipper canter-circular saw line », explains Martin Huber, project manager and member of the sales department at Linck.
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Feeding to the chipper canter-circular saw line :
Saw logs arrive in line from the log yard (red arrow),
two- and four-sided cants from the merry-go-round system
(yellow arrow)
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The Linck optimising shows on the screen how the
next sawing step shall be carried out.
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In line from the log yard
Long logs supplied to the Decker log yard are cut to length on a sorting crane from Baljer & Zembrod depending on the orders and are then fed to the butt-end reducer and the debarker. The logs arrive in line at the saw line. The Linck scope of supply starts with the outfeed conveyor behind the debarking station. A cross conveyor singulates the logs for transport into the longitudinal infeed. A Microtec 3D-scanner is installed underneath the control cabin of the saw line. Starting from the scanner, the logs are traced through the whole saw line. « The measured data are transferred to the Linck optimisating system. Due to orders and product lists as well as cutting patterns stored in the programme, it is possible to calculate the best possible processing for each log », describes the project manager during the visit. The programme even optimises sideboards. The calculated data, however, is for information only. A scanner installed in the board edger line measures and optimises the boards again.
Based on the determined cutting pattern, the log is automatically turned into the correct cutting position. The chipper Canter VM 50 produces two waney-edged, parallel faces. « The cutter heads can open up within a log by an additional board thickness in order to achieve a higher sideboard recovery ».
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Following the chipper canter-circular saw line the sideboards
are directly separated from the main product.
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Towards the next building :
Sideboards are transported to the existing board edger.
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Splitting in the second machine pass
The following circular saw unit CSMK 425-A3/B3 produces up to seven boards. As the machine is equipped with six positioning servo axes, it is possible to predetermine the number of products to be sawn from log to log. The double arbor saw is also equipped with limiting routers for saw arbor protection. A trim saw following the saw unit cuts the sideboards to customary lengths. Two- and four-sided cants that need further splitting are automatically transported into the merry-go-round system which also includes a metal detector.
A Lincktronic-V-scanner is installed in the cross conveyor in front of the re-feeding into the chipper canter-circular saw line which determines cant size and shape. The cants are optimised for processing to achieve high recovery. The saw line operates at a frequency converter controlled feed speed of 30-100 m/min. and is designed for processing logs from 3-11 m length and 12-65 cm diameter.
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Main product sorting :
Cants longer than 6 m are held available on a separate table…….
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… the remaining lumber goes to eight stacking places
via a roller conveyor where it is manually taken-off.
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