Drying of wood and its features

Drying is done to remove from it a certain percentage of moisture. It is held in order to ensure a stable linear dimensions of the material. This is very important in construction and other sectors. Note that drying of wood consists of two processes: moisture transfer and moisture transfer. First – it is the movement of water inside the tree, the second – its evaporation into the environment. In order to get the desired result required the same intensity of the processes. Otherwise, you may experience internal tension, which eventually will cause deformation and cracking.

The Main issue that should be resolved by the technology of drying wood is faster moisture transfer from the inner layers to the outside. For dehumidification there are a lot of different devices. The movement of water inside the tree is under the influence of the following factors: humidity, temperature, pressure. To be more precise, their different values at different points of the material.

Drying should be conducted using equipment capable of providing the following tasks: to minimize cracks and deformations, to minimize the power consumption and time. One applied for this process technology is drying in special chambers. Vacuum wood drying consists of preparing stacks of wet forests, its preheating, the main process of water removal, intermediate and end vegetablebased and conditioning.

Depending on the further intended use of the material, there are four categories of wood processing I, II, III,0. The best quality is the drying of wood I quality category. It is produced for the lumber used in the future for making things, which have to meet increased operational requirements. Category zero implies removing moisture to a level allowing the transport of the material both for export and for use within the country.

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The Quality of drying is determined by several parameters. Among them the main: the average humidity of the wood in the pile and its deviation from a certain target value, the residual stress in the treated lumber, the comparison of the amount of moisture in individual boards with the figure in the whole party evenly folded. There are also value differences in percentage of fluid thickness.

Not always a process of drying can achieve the desired parameters, if any deviations may have a variety of defects. The main ones are: mold, shell nedouchka stacks of material as a whole, the strong warping of boards, uneven removal of moisture through the thickness of the range or scope of the folded evenly batch of wood, collapse, cracking. The causes of defects are: lack of technology, weak monitoring of the process of uneven heat distribution and stagnant air circulation, improper placement of the batch of material in a stack, excessive speeding up of the drying, the wood species (in this case, additional training is required).