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Manufacture of power line poles


The service life and safety of the use of wooden impregnated supports strongly depend on the quality raw materials. Pine - a material used for the production of power line poles, growing to a certain height in different regions, has a different age. In Karelia, the age of this tree is twice than on any other territory of Russia (except Siberia). Accordingly, the higher the density of annual rings, the higher the density of wood and the future pole of the power lines! Since the priority of our policy is the quality of the finished products, we use only Karelian pine for the production of poles of the power lines!


Our company is the only one among the manufacturers of power line poles in Russia, where the process of mechanical processing of wood consists of two stages! First, the wood for the future power line’s pole enters to the debarking station, where only the bark is removed. In this case, the bast (a dense layer of wood under the bark) remains untouched. What is it for? Even with the use of modern drying technologies, the process of changing temperature conditions often leads to the appearance of cracks on the surface of the tree trunk. This, in turn, leads to the washing away of the antiseptic from the wood, and access to the non-impregnated parts of the product, significantly reducing its service life. It’s more dense than the core, the layer of bast protects the wood during the drying process from cracking. However, this same layer can prevent penetration of the impregnating composition into the wood. Therefore, after performing its protective function in drying, bast is removed in a separate technological area during the peeling process.


The above-described technological process allows us to achieve the required necessary content of the wood without compromising its integrity. Nevertheless, our drying is designed in such a way that the air streams circulate, reflecting off the walls, avoiding direct exposure to the products.


As already mentioned, this process is carried out after the control measurements determine that the wood in the drying has reached the necessary degree of humidity. After that, in the peeling the area is removed an additional ~ 0.5 cm of wood. Now the power line poles are ready for impregnation.


Impregnation of power line poles is carried out by the water-soluble antiseptic of the CCA group, which includes salts of chromium, copper and arsenic. Used only the foreign composition - paste, possessing the highest indicators of efficiency and safety of application. Russian analogues of foreign antiseptics contain non-ferrous metallurgy waste containing impurities that help washout out the preparation from wood and do not allow it to soak at the desired depth.

The impregnation technology operates according to “vacuum-pressure-vacuum” principle. In the autoclave, a vacuum is created initially (2), which helps to draw out excess moisture and increase the "pores" to facilitate the subsequent penetration of the antiseptic into the wood. After the completion of this step, an antiseptic solution is supplied (3) to the autoclave and a pressure is created (4) which "pushes" the impregnation inside the product. The pressure is maintained for specified period in accordance with the required process conditions. Then re-creates a vacuum mode to impregnating composition is more evenly distributed inside the poles.


Fixing the composition in wood has always been a problem for Russian manufacturers, because antiseptic is a rather dangerous substance. The only chemical process proposed by the technologists of the wood protection laboratories was the maintenance of impregnated poles in the open air. This method was still good enough for old environmental standards. However, these standards in the west are much more strict - holding in the open air is not enough! Our plant uses the “know-how” of Canadian company for the production of impregnated power line poles, eliminating the washout of an unrelated antiseptic! Processing is carried out in a separate autoclave with a special chemical composition. After such processing, Canadian specialists guarantee the service life of wood up to 70 years.