FREIBURG, GERMANY -- More than 70 companies from 15 countries were briefed about innovative system technology and current trends in solid wood processing during Weinig's Solid Wood Days Oct. 12 and 13. The event was held at the Ohnemus Co. in Kappel-Grafenhausen near Freiburg.
Ohnemus has developed steadily from a hardwood sawmill and trading company to become the manufacturer of high-quality sorted solid wood panels and represents the modern company that has secured sustained competitiveness through consistent adaptation to the market. With its refinement of cut pieces, Ohnemus was able to develop an interesting clientele for staircases, furniture and interior fittings.
The concept of the Solid Wood Days combined an insight into running production at one of Weinig's partners with a comprehensive section for presentations. The focus was on increasing added value. Optimisation of cutting to size of widths and lengths, wood optimisation through the introduction of scanners, wood saved using planing machines and intelligent gluing systems were the main topics. Information on Weinig's finger-jointing systems rounded off the schedule and emphasised Weinig's comprehensive expertise in solid wood processing
Visitors were able to form a global impression of all this on a visit around the production facility. Weinig supported the Ohnemus company as its partner for the whole production process. The result of this collaboration is a state-of the-art linked solution from cutting to size through to the finished solid wood panel.
Intelligently optimised cutting to size of widths and lengths:
At the start of the processing process there is a Maxicut 800 pre-cut saw which removes major defects in the wood such as warps and splits in the cut wood. The operator can then turn the boards and inspect the underside via an automatic turning station before measuring the width. Using a laser controlled via a joystick s/he can then measure the unfinished board either by marking the whole width of the board or marking various quality zones along the surface of the board. The division of board width and quality zones into the corresponding cutting widths is then done automatically by the TimberMax width optimisation system. Based on the cutting list and optimisation parameters (timber yield, achievable prices, required numbers), it calculates the optimum division of the board for each rough board measured.
The rough board is divided up exactly by the ProfiRip KR 450 M multiplied buzz saw. The cut lamellae and waste are separated from the oddments via a discharge belt conveyor downstream from the ProfiRip. These so-called returns are fed back into the machine before the width measuring stage, measured again and cut into widths.
The wood then travels through the chalk marking station to the optimising cross-cut saw. The OptiCut 304 calculates the best division into lengths based on the best combination of the cutting list and optimisation parameters and cuts the lamellae to size.
High-tech panel production:
From here the workpieces are processed using the new Weinig panel line and a hall specially extended and fitted with climate control. The whole process, from feeding in the boards cut to variable widths to the finished, sanded and stacked panel, runs nearly fully automatically with only 2 operators required. The first station is a Powermat 500 moulder with automatic pull-in, measurement of width, mobile spindle, automatic discharge for the various widths and transfer to the sorting station. The lamellae are then sorted according to colour and application of images. The lamellae are then collected automatically in the buffer before the ProfiPress T 3500 HF where they are glued automatically and pressed nearly free of offsets into panels. Very short pressing times are guaranteed through implementation high frequency technology. Since only the joins are heated, no stresses or warping are created in the wood, especially in hardwood in comparison to other gluing processes. Furthermore, energy consumption is significantly lower. HF gluing also ensures demonstrably better join quality than using traditional processes.
After pressing the panels are fed individually into the grinder. The finished boards are then stacked on pallets using vacuum technology. The trade visitors to Weinig's solid wood days were very enthusiastic about the combination of live demos and accompanying presentation schedule. "Our concept of demonstrating Weinig's overall expertise in a manufacturing company has worked as planned" CSO Stephan Weber summed up at the end of the event.
Source: Michael Weinig AG
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