FWW


Technology

Technology

Compliance with the technology is one of the main requirements we apply to our production. The technological process for manufacture of treated wood transmission/communication poles includes five main steps, each of which is vital for products' quality.

 

 

1.         Harvesting of raw-materials

The best raw-material for wooden piles is the northern pine harvested in the area between 58° and 64° of latitude north in the autumn - winter period. These are strong, straight trees with closely placed annual rings and optimal sapwood width.  Upon their arrival to the production facilities, the raw-materials are subjected to entry quality control aimed at discarding of unfit items with knots, side drought, mechanical damages, decay, fissures or deformations.


 

2.         Debarking and cross-cutting

Selected posts undergo a debarking process consisting in removal of bark and upper bast fiber (2 to 3mm) and making them smooth and clean.   In the process it is very important to preserve the post's geometry, i.e. light tapering from a narrow top to a wider base providing greater stability to a pole. Immediately after debarking, the poles are subject to a secondary check for hidden defects, such as tobacco knots.

 

3.         Drying

The crucial condition for successful treatment of wooden poles consists in the wood's adequate drying. In special drying chambers, throughout 6 to 7 days, we achieve equilibrium moisture of wood (maximum 28%). With such a moisture level, tree's cells still have moisture, while the intercellular space does not and can be filled with a protection compound at a treatment phase. We also dry the wood outdoors, but only during a summer period and at a temperature above 10° С,  since this process is more time-consuming and can take one to three months.

 

4.         Treatment

After drying, the poles are ready for treatment. The most efficient treatment is with the vacuum-pressure-vacuum method.  It ensures uniform penetration throughout the entire sapwood area at a depth of 30 to 40mm.  For treatment of poles we use CCA water-borne preservatives supplied by Osmose company and based on copper, chromium and arsenic, or, optionally, copper-based preservatives (Osmose Celcure C4). These preservatives are most efficient in protection of wood from most of the hazards, such as mold, fungi and insect pests. The treatment process consists in the following:

  • Vacuum achieved in the pressure chamber removes air from the wood's intercellular space.
  • The pressure chamber is filled up with a preservative impregnating solution.
  • at a pressure of 12atm, the preservative impregnating solution is fed to achieve required preservative absorption and penetration to 100 percent of the sapwood's depth; 
  • at the end of the pressure process, the preservative impregnating solution is removed from the chamber; 
  • Re-established vacuum removes surplus preservative substance from wood surface.
  • to ensure safety of the products, a requisite condition of working with CCA-preservatives is implementation of the process aimed at accelerated fixation of the preservative components in the wood. During this process, within the period of 60 t0 90 minutes at a temperature of 60°С, the components of the solution penetrate the wood structure and achieve a water-insoluble state; 
  • the vacuum re-established in the pressure chamber removes the moisture residues from the wood surface.

At the end of the entire treatment cycle, the poles become dry and clean, ready for shipment to customers.

 

5.         Marking

Marking of the products is a one more important aspect for customers.  At the end of each pole with a length over 8m there is a plastic label with the following information:

  • manufacturer's name;
  • brand and type of a preservative, with which a pole was treated
  • pole's class and length;
  • date of treatment;
  • treatment charge number;

Each charge shipped is provided with a treatment protocol containing complete information on the process performed.

It is possible to implement marking of poles based on customer's patterns.



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