Wood drying is performed to remove from it a certain percentage of moisture.It is performed in order to ensure a stable linear dimensions of the material.This is very important in the construction and other fields.Note that the drying of the wood consists of two processes: the moisture and moisture.Origin - this movement of the water inside the tree, the second - its evaporation into the environment.In order to obtain the desired result requires the same intensity of the processes.Otherwise, it may cause internal tension, which eventually will cause deformations and cracks.
main problem to be pursued by the technology of drying wood is quickening moisture from the inner to the outer layers.For dripping as there are a lot of different devices.Moving water within the tree it is performed by the following factors: moisture, temperature and pressure.To be precise, their different values at different points of the material.
Wood drying must be carried out using equipment which is able to ensure the following objectives: to minimize cracks and deformation, minimize power consumption and time.One of the applicable technology for this process is drying in special chambers.Vacuum drying of the wood consists of the preparation of the pile moist forests, its preheating, the basic process of removing water, intermediate and final Moist and air conditioning.
Depending on the intended use of the further material, there are four categories of wooden: I, II, III, 0.The most high-quality wood drying is the quality I category.It produces lumber used in the future for the production of things, which are increased performance requirements.Category Zero involves the removal of moisture to a level that allows for the transportation of the material both for export and for domestic use.
drying quality is determined by several parameters.Among them the main ones: the average moisture content of wood in a stack and its deviation from a specific target value, the residual stress in the treated lumber, comparing the amount of moisture in the individual boards with the index for the whole batch evenly folded.Also relevant are the percentage of drops of liquid through its thickness.
not always the drying process can achieve the desired parameters for any deviations may occur various defects.The main ones are: mold, shell, nedosushka stacks of material in general, strong warping boards, uneven removal of moisture through the thickness of the assortment and volume shipment of timber uniformly folded, collapse, cracking.The causes of defects often are as follows: failure to comply with the technology, weak control over the process, non-uniform heating, distribution and stagnant air circulation, poor styling lot of material in a stack, excessive speeding drying wood (it requires additional training).