State-Of-The-Art Lumber Manufacture

Dramatic changes brought about by the trend to manufacture lumber from small logs are reviewed. In Scandinavia, reducer band mills consisting of chipping slabbers and multiple band mills process 6 to 12 or more 5-to 15-inch logs per minute. Electronic scanners are used for scaling, sorting, determining log geometry and implementing bucking, log breakdown, edging and trimming decisions. Sophisticated automated data processing systems are used for information gathering and decision making and implementation from the forest to the market place. Scandinavian systems are widely used in the Soviet Union. New processing methods in North American include merchandisers, autobuckers, chipper headrigs, and sophisticated multiple band headrigs with scanning, computing and log orienting peripherals. Tilted bandmills, headrig slab chippers, rotary gang edgers, Strobe saws, collarless saws, improved band and circular saw guides, complicated hydraulic and air bandmill strain devices, high temperature drying, abrasive planing, linear programing and other developments useful for both small and large log processing are widely used.

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