Machine vision and measuring applications in timber manufacturing Machine vision is used in various measuring and grading systems in the sawmill industry’s processes. The most common include: log scanning sawing control quality grading systems of sawn goods Log scanning methods Log scanning units are located in log sorting and sawing lines. They use 3D scanners
Handling dried timber After drying, stick-stacked timber loads wait for further processing. Storage conveyors transfer loads to the grading plant, where an unloading elevator lifts tilted loads one layer at a time. Each layer of timber is forwarded to the grading plant’s feeding table, and the sticks fall from between the layers onto a stick
Drying of sawn timber After sawing, timber must be dried to reach the moisture content required for each purpose of use. The drying grades applied to sawn timber are shipping dry and carpenter dry. The moisture content of shipping-dry timber must be 18–24 %, while that of carpenter-dry timber must be 8–14 %. When drying
Saw machines and sawing lines Sawing is a process that consists of long streamlined production lines and interim storage phases. This article presents the first part of the sawing process, ranging from log sorting to green sorting of sawn timber. Log sorting and measuring Logs are received at a sawmill on a log sorting line,
By-products of the sawmill industry The sawing process produces various by-products that are financially significant for the sawmill industry. Sawn timber accounts for roughly half of the volume of a single log. The other half consists of by-products. Wood chips, sawdust and bark all have their own uses. Sawn timber accounts for roughly 80 %
Manufacturing process of sawn timber – from logs to sawn goods The sawing process starts at the log sorting line, where logs are received and sorted. After debarking, logs are fed onto a sawing line. Bark is forwarded to a thermal power plant, and any residues are sold. The sawing line consists of several
Strength grading of sawn timber In addition to grading sawn timber on the basis of its visual quality, sawn goods to be used in construction must also be strength-graded. Strength grading means that the strength of sawn timber is determined on the basis of grading rules. Grading rules present minimum requirements for strength and elasticity
Further-processed timber The further processing of sawmill industry products usually takes place at a sawmill or, according to the current trend, in companies specialising in further processing. Primary further-processed products include: Planed and painted timber Finger-jointed timber and components Glulam beams and panels CLT Logs Structures with nail plates Thermally modified timber Impregnated timber. These
Other applications of sawn timber As a material with multiple uses, sawn timber has numerous applications alongside construction and interior design. This article describes industrial applications. In addition, sawn timber is used extensively in DIY woodworking and construction, as well as handicrafts. The packaging industry manufactures pallets, cable drums and boxes, largely from sawn
Basic properties of sawn timber Sawn timber comprises timber, whose surfaces have been sawn from four sides. Timber is also available without edging where only two sides have been sawn. Different profiles can also be made using special sawing methods. This presentation focuses on the Nordic sawing method, which is generally used in the sawmill
