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moisture content also cause shrinkage and change shape

Wood is a material life that can change shape and size. The shape and size change according to the wood moisture content (MC). The lower levels of MC would also smaller timber sizes. MC size is used as an indicator of whether the timber proper is used or not. When MC lower means wood more dry. Good MC standards wood to be processed into furniture is between 8 - 12%. At these levels the possibility of changing the form of timber is very small. There are various kinds of MC gauge. This figure does not mean 8-12% wood volume is water. The following detailed calculations.
MC = (AB) / B x 100%
MC = Moisture Content, A = Weight Wet Wood, B = Weight of Dry Wood
Dry wood weight determined after the wet wood oven-dried at a temperature of 100 degrees Celsius for 48 hours.
So for example A = 1.330 grams and B = 1.200 grams, the result is the following:
MC = (1.330-1.200) / 1.200 x 100%
MC = 130 / 1.200 x 100%
MC = 0.1083 x 100%
MC = 10.8%
For best results use a special table. Drying process should always be controlled.
Log wood also experience shrinkage
As the wood board that can be experienced shrinkage due to differences in air humidity, then the log wood was still shrinking. A tree that just felled has a level MC of between 40-60%. In some cutting down of trees areas they will be put the logs on the outside for several day even weeks to reduce the level of MC. To prevent cracking or breaking of the log, is attached a kind of nail shaped like a worm on the end of the log (the designs can be vary) to prevent the log cracked or broken tip. The broken log or cracked will automatically reduce its economic value. Some specific places have different methods. After the tree was cut, the bark immediately peeled and wood are left in longer sizes to reduce the widening crack defects. In the type of wood that has very high economic value, before cutting a tree the bark of the tree is cut down on a few months before harvesting. This time is intended to prevent the distribution of food to the leaves, which is basically a liquid, so that when a few months there was no supply of food from the tree roots will dry naturally in the form and size of the whole. Depreciation on real logs is not too large considering the cross-sectional area of the exit of water from the wood is not as wide as the timber had been cut and cut. And based on the log diameter, the possibility of water coming out will only occur on the surface of the logs that are thinner than the diameter of the log itself.

Wood can change shape
Wood is composed of millions of the pillars of very small (like a line of needles) and is connected between one and another. Within each pillar (pore structure) is there a small number of sediment water. There is water content since the trees are still standing. When the tree cut, cut indirectly made hole for the way water escape from the wood pores. However, it is not as easy as we imagine the water contained in the pipe. If the humidity outside the wood surface at least equal to or greater than the moisture in the wood moisture content in the wood will remain inside. At the time the air temperature increases beyond the surface, this phenomenon has forced the water in the timber to exit through the process of evaporation. If the wood loses its water content, will automatically lose the space which previously used the water content and this space makes the bond between the pores become closer. Hence, the size and shape of timber wood will shrink as the wood loses volume in it. If water can get out of the wood, must also be re-entered the wood, although not as easy as yawning. Strength and direction of shrinkage of wood is influenced by various aspects such as violence, the position at the time of dried wood, the wood (terrace or pig) and others associated with the drying process. From this is point why the wood must be dried before entering the production process. Wood drying process commonly called Kiln Dry. Harder wood will be longer and more difficult to dry. Soft wood is faster in drying process but also easier to be wet again because the pore size is greater.

Author : Draker_Ster is the owner of the website which specialists in offering indoor and outdoor furniture.