Types of sawn timber according to the processing method
According to the wood processing method, sawn timber is divided into edged and unedged .The first assumes 4 sawed sides, and on the edges and strata the size of the surveys should not be larger than the permissible sizes( determined by grade).Obzol - cut from the log piece of the board, which is not processed around the edges. It is often used for carpentry methods of finishing houses and architectural structures.
Unedged design means partially sawed edges or not at all. One-sided ones have one edge and propylene plates, and the survey on the sawn edge should not be more than the allowable size parameters. Loseware( unedged boards) are applied less often than, the first. However, they are also used in construction. For example, for the lining of any structural elements, the manufacture of floorings, planed parts and so on.
Classification of sawn timber by shape and size
Thanks to modern wood processing technologies, various types of this product can be produced. The sawn timber assortment includes boards, racks and bars, sleepers, bars( with a thickness of more than 100 mm), croaker, quarters( obapol), plates, etc. We will describe them in more detail.
boards - made from thick beams or logs, can be trimmed or uncircumcised. It has a thickness of up to 100 mm, and the width is more than twice the thickness. They are used most often in the arrangement of floors( including plinths), decoration of walls, furniture production.
Bar - by the number of processed sides can be two-, three- and four-cant. As a rule, the width and thickness are more than 100 mm. They are used in the construction of any load-bearing structures, cottages, cottages, as they are able to withstand heavy loads.
Bar - differs from the previous size. Its thickness is up to 100 mm, and the width should be no more than twice the thickness. They are used in the carpentry and furniture industries. When decorating houses with their help, do boxes for doors, crossbeams.
Ties - have a large thickness and width, but a short length. In fact, this is a kind of beam with a fairly large cross-section. Use when creating a railroad track.
Slab - lateral part of the log. This is a kind of "departure" when sawing logs on all sorts of boards. Often used for auxiliary structures, temporary structures, the creation of a roofing under the roof.
Defeated ( or quarters) - also created from the side of the log. Has the first unpropylene and propylene second surface. Used in the manufacture of small carpentry.
Plates - half logs, resulting from its sawing in the center. They have only one straight side. The size depends entirely on the size of the log itself. Often used to produce the above products( bars, boards, sleepers, in some cases, a massive board, etc.).
Classification of sawn timber depending on the wood
The variability of the lumber depends on the species of the tree: they are made from coniferous or deciduous massifs. The first include spruce, pine, larch, fir, cedar. The second - birch, oak, maple, beech, poplar, aspen. Coniferous tree species are more often used in construction, as they absorb moisture less, are easier to process, durable and are rather hard. They are used for the erection of load-bearing structures.
However, conifers contain a large amount of resinous substances, because they are more likely and faster to burn.
Spruce wood is very popular. It, by the way, in its composition contains the least amount of these resinous substances. Of hardwoods, oak is more common. It is his wood that is distinguished by its exceptional strength and hardness. According to GOST 8486-86 all lumber can be of four kinds. The selected grade is used for the manufacture of various parts in shipbuilding, for crateing car sides and in other responsible jobs.
