Wood volume – in cubic meters – not the last, albeit decisive, characteristic, determining the cost of a specific order of woody material. It is also important to know the density (specific weight) and the total weight of the batch of boards, timber or logs requested by a separate client.
Features specific weight
The proportion of the cubic meter of wood – in kilograms per cubic meter – Determined by the following factors:
- moisture content in wood;
- Wood fiber density – in crossing a dry tree.
Forest, cut down and harvested on the sawmill, differs by mass. Depending on the breed, tree type – spruce, pine, birch, acacia and t. D. – Dry tree with a specific name of harvested products has different density. According to GOST, maximum permissible deviations of the mass of one cubic meter of dry forest are allowed. Dry tree possesses 6-18% humidity.
The fact is that very dry wood does not exist – there is always a small amount of water in it. If wood and lumber did not contain water (0% humidity), then the tree would have lost the structure and crumbled at an arbitrarily tangible load on it. Bar, log, board quickly waxed on separate fibers. Such material would be good only as a filler for composite materials based on wood, such as MDF, in which fastening polymers add to the wood powder.
Consequently, After cutting down the forest and workpiece of wood, the latter seems high quality. Optimum term – year from the day of the workpiece. For this, wood is stored on the covered warehouse, where there is no access to precipitation, high humidity and dampness.
Although wood on the basis and in warehouses are released in the “cubes”, Her high-quality dryer has important. In ideal conditions, the tree dry out in the indoor room with fully steel, metal walls and ceiling. In summer, the temperature in the warehouse rises above +60 – especially in a sultry period. The hotter and land, the sooner the wood will dry. It is not stacked closely, as, say, bricks or steel professionalist, but lay out so that the unobstructed influx of fresh air is provided between bars, logs and / or boards.
The land of the tree, the more easier it is – and therefore, the smaller fuel consumption of the cargo car will spend on wood delivery to a specific client.
Drying stages – Various degrees of humidity. Imagine that the forest was bought in autumn at frequent rains. Trees are often wet, in the wood full of water. Wet wood, just cut in such a forest, contains almost 50% moisture. Further (after storage in conditions of indoor and closed space with supply-exhaust ventilation) it passes the following stages of drying:
- raw wood – 24 … 45% humidity;
- Air-dry – 19 … 23%.
And only then it becomes dry. It is time for it is beneficial and quickly soldered, while the material has not rejected and did not pull from mold and fungi. As averaged standard, the value of humidity is adopted, equal to 12%. To secondary factors affecting the specific weight of the tree, are the time of year, when a specific part of the forest was cut down, and the local climate.
If we are talking about the volume of wood, approximate to one cubic meter, its weight is recalculated in tons. For loyalty, blocks, stacks of wood tune on auto places capable of withstanding the load up to 100 tons. Knowing the volume and type (wood breed), determine the group of density of specific wood.
- Small density – up to 540 kg / m3 – Inherent in spruce, pine, fir, cedar, juniper, topoly, Lipov, Ivov, Olkhov, Chestnut, Orekhov, Barkhatov, as well as wood materials from Osin.
- Average density – up to 740 kg / m3 – It consists of larch, tees, most birch breeds, elm, pear, most oak species, Ilm, Karagach, Clane, plane, some kind of fruit crops, ash.
- All that weighs in the size of a cubic meter of more than 750 kg, refers to acacia, count, samshet, iron and pistachio trees and homegrabu.
Volume weight in these cases is recalculated in all the same averaged 12% humidity. So, GOST 8486-86 is responsible for coniferous breeds.
The weight of a dense cubic meter of wood, depending on the breed (delicious or coniferous), tree type and its humidity, it is easy to determine the values on the table. The content of moisture is 10 and 15 percent in this sample corresponds to dry wood, 25, 30 and 40 percent – raw.
For example, by ordering 10 firboards with a size of 600 * 30 * 5 cm, we get 0.09 m3. Qualitatively dried spruce wood of this volume has a weight of 39.6 kg. Counting weight and volume of edged board, timber or calibrated log determines the cost of delivery – along with the remoteness of the customer from the nearest warehouse to which this order was received. Translation into tons of large volume of wood decides which transport is used for delivery: truck (with trailer) or railway car.
Alloy forest – Hurricane or flooding wood, as well as residues that belongged to rivers downstream as a result of natural impacts or due to human activity. The share of the alloy forest is in the same range – 920 … 970 kg / m3. It does not depend on the tree of wood. The moisture content of the alloy forest reaches 75% – from frequent, constant contact with water.
The lowest weight – at traffic jam. Cork tree (more precisely, its bark) has the highest porosity among all vehicles. The plug structure is such that this material is filled with numerous small voids – according to the consistency, it is approaching the structure, but retains a much more solid structure. The elasticity of the cork is noticeably higher than any other wood material of the easiest and soft rocks.
As an example – plugs from bottles from under champagne. Assembled volume of such material equal to 1 m3, weighs 140-240 kg, depending on humidity.
How many woodwork weigh?
Requirements of guests on sawdust do not apply. The fact is that the weight of sawn timber, in particular sawing, more depends on their fraction (graininess). But the dependence of their weight from humidity does not change from the state of the wooden material: (not) treated wood, chips as waste from the sawmill and T. D. In addition to the table calculation, the empirical method is used to determine the weight of sawdust.
Correcting the weight of a particular part of the wood, the deliverant will take care of its speedy delivery. The consumer pays attention to the breed and form, the state of wood, its weight and volume at the stage of placement of the order.