Method of drying of wood :

Artificial drying by pulsated hot puff blowing, in waterproofed and thermo-insulated dry rooms, employing like heat source the steam, generated since a boiler, whose fuel can be coal or fuel.

Process:

Adjusted with the programs and schedules of drying defined for each wood turpentine, in consideration with the moisture contained initially in, the thickness wood turpentine of the parts to be dried, dimensional stability of the wood turpentine and contents of final moisture inter alia. During the process, one carries out routine inspections in order to decrease the risks of damage in wood by the internal tensions of fibres, generated during the natural process of growth of the tree or tensions generated by natural or artificial drying.
The temperature, the circulation air and the relative humidity are the environmental conditions combined to define times of wood seasoning, these conditions are controlled inside the rooms of drying thanks to the accessories (valves of passage, inter change of heat, ventilators, extractors, etc....) and equipment of measurements, controls and alphanumeric and graphic register.
The contents of moisture in front wood, during and after the process of artificial drying are carried out by direct method (using digital xylohidrometers) or by indirect method (in laboratory " method of stove ").
The final contents of moisture of wood are adjusted with the definite international standards according to the use which will be done with wood, dimensions of wood (thickness or size of the part), the moisture of balance of the site in which will work wood, the requirements of the customers or the technical recommendations given for the special cases.

In general the standards define in 12% the water content like the optimum level of drying, however this value can be decreased up to 8% roughly in the case of transport out of containers with not controlled environmental conditions, or one can manage to maintain contents of moisture of roughly 18 % when wood is immunized with low pressure.


The time of the process of artificial drying can vary between 36 hours and several days or weeks depending on the factors like the initial moisture of wood, the thickness of the parts, the dimensional stability of wood, the contents of final moisture, the tensions internal in fibre for conditions or place of growth of the tree, whiteness or hardness of wood, conditions of effectiveness of the room of drying and logically availability of the rooms of drying.

It east were appropriate to clear up that during drying, in spite of the technical handling of the process damage in wood arises (cracks, slits, arrowings, curves detachment the noeux one, etc), the percentage of damage in normal conditions can vary between 3 % and 15 % roughly depend on the factors mentioned in the preceding paragraph.

For the case of wood to be exported, it east also convénient that the customer there the distributor define clearly and exactly the technical standards and/or conditions with which they will establish the quality of all the pieces of wood to be marketed, they must be fully conscious of the processes and/or the environmental legal conditions necessary for the production, transport, the transformation and the marketing of wood (since the licences of provisioning, except-conduits, licences medical, international standards which apply to wood (cf nimf15, etc.....).

importation exotic wood