SGUARIO is a family company located in Sao Paulo area, in Brazil. It processes annually 40.000 m³ of pine Taeda and Elliotis, mainly for mouldings and laminated and edged-glued panels. Its production tool is based on a logyard where logs are presorted, then cut in batches by a twin band saw, followed by several resaw machines. This twin band saw is set at a fixed dimension for each batch, and the analysis made by Ciris Engineering showed that the infeed table used, combined with the lack of saw positioning, generated a serious loss of raw material. This is why Ciris Engineering studied and carried out a modernisation of this head equipment, aiming at optimising the raw material while preserving the sawmill current operating mode, i.e. sawing a fixed cant thickness for each batch. The solution implemented by Ciris Engineering is composed of three main elements:
Modernisation of the infeed table by installing an accurate sharp-chain, a serie of top rollers to maintain the log in position on the chain; Addition of a scanner accurately measuring the log position with respect to the chain ("offset"); Modernisation of the twin band saw, by addition of two hydraulic positioners.
The control system measures the log position, chooses the best sawing pattern and adjusts the saws position.
Results: After several months of operation, one can note a significant raw material increase. A modernisation at moderate cost which brings back a high performance level to an old installation.
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