OAK WOOD PRODUCTION
In order to guarantee an optimal colour, European oaks are cut in winter. With great care, we sort the selected logs according to the best yield and produce them in a wide variety of varieties to produce sawn timber.
With the most modern log band saw technology, the high-quality oak logs are produced into sawn timber. Length, diameter, straightness and purity are the criteria of the final use.
There are different approaches to this. The traditional block cut, which enables the processor to reproduce the log sequence. The log-twisted cut, which allows the processor to achieve the highest possible and cleanest possible wide sides. The quarter cut, also called quarter or rift cut, produces a high proportion of standing annual rings.
The partially edged A-goods provide the basis for the production of parallel edged oak. Here 100% heart-free goods are sorted. Further criteria are the sharp edges and the purity of the individual boards.
DRYING OAK WOOD
Our oak wood is already stabilized on the surface through pre-drying. This has a positive effect on the stability during production. We protect each layer of oak boards from wind and sun rays. In addition, each package of wood is permanently storaged under a roof. Now the gentle drying of the wood begins in a cool and humid climate. This occurs when large quantities of fresh wood are closely stacked.
COLOUR CHANGES THROUGH DRYING
Even a too slow pre-drying can affect the colour of wood. A great wealth of experience provides the golden mean here. By constantly monitoring the climate, we control the careful drying process for the sensitive oak wood. This gives us the security of a constant wood quality.
Through modern vacuum drying chambers, we obtain a residual moisture of 8 – 10 %. With optimal storage, our oaks reliably maintain this optimal final moisture content. A too low air humidity (≤ 50 % relative humidity) in the production hall can lead to cracking in chamber dried oak, even afterwards. Please pay special attention to this We guarantee careful drying of the wood for the processing of oak lumber, which you need for your interior design.
We speak of a chamber-dried product with a residual moisture of 8 – 10 % HF. We achieve this residual moisture by using modern vacuum drying technology. Even with high cutting thicknesses of up to 65 or even 80 mm thickness. The regulation of relative humidity in a drying room is controlled by the extended components of air flow, temperature and evaporation of water through negative pressure in the boiler tank. This can reach 0.1 bar during vacuum drying. Under these pressure conditions the bound water particles evaporate already at 50° C, which are located inside the board, in the cell nucleus.
Lumber drying by vacuum technology begins in the board core and proceeds from the inside to the outside. The big advantage is the even moisture content over the entire board thickness of 8 – 10 %. In addition, vacuum technology gives greater flexibility, as the drying process is considerably accelerated. These are the big differences to air drying or fresh air drying. Here the lumber dries from the board surface to the inside. With the help of vacuum technology, we dry our lumber more gently and with better results. The surface of the board is wonderfully closed, as if the board were still freshly sawn.
With optimal storage of chamber-dry oak, our product reliably maintains the final moisture content of 8 – 10 %. Even after storage, chamber-dried oak can crack if the humidity in production halls is too low (≤ 50 % relative humidity). Please pay special attention to this.