Wooden articles of improved form

Oksana Kolganova Although wood is a beautiful building and finishing materials, sometimes there is a need to change in a particular direction of its quality. It is important to use technologies that do not violate its main advantages - eco-friendliness. The market of finishing materials for the country house growing number of consumers prefer products made of wood. To improve the performance of wood products and improve the decorative effect of relatively cheap wood, there are two ways. One of them - the so-called active modification, ie, chemical or biological treatment of wood (volume or surface). Active modification involves changing the structure of wood applied to the surface of special trains. A set of these methods is quite effective and preferable to the price / quality ratio. Nevertheless, chemically or biologically treated wood can not be completely environmentally friendly product. There are other methods of passive modification of wood, which include the creation of Thermo. He does not use chemical additives in the tree structure. The modification occurs only at the expense of handling environmentally friendly elements, such as steam and natural vegetable oils. The resulting products remain as clean as before the treatment process. At the same time greatly improves their quality and decorative properties. Testing of heat Thermowood (heat-treated wood, thermally modified wood, THERMOWOOD, thermowood) - this is hydrothermal treated wood. It is a natural, environmentally-friendly decorative materials and has, in comparison with conventional carpentry and construction timber, a number of unique performance characteristics. Until the mid 1990's the most advanced technology of heat treatment is the high-temperature drying at 100-150 ° C. In 1997, a woodworking factory in Finland introduced a new technology of drying at a temperature of 150-230 ° C. The higher the temperature, the greater the weight loss wood by evaporation. Depending on the conditions of heat treatment and wood residual moisture content is 40-60% lower than that dried in the usual way. The process of treatment usually lasts about 24 hours. Moisture content of wood after heat treatment is reduced by 80-90%. As a consequence, significantly reduced its heat: heat-treated wood is heated much less rough. The surface of the heat-treated wood is not porous and dense, which reduces the ability of wood to absorb moisture from the air (30-90% depending on the temperature and drying time). In practice this means that the tree is able to repel water without additional treatment with special impregnation. Thermal treatment decomposed wood sugar, is a breeding ground for microorganisms that contribute to rotting wood. It is extremely resistant to decay. European standards are three classes Thermo. In this classification reflects the fundamental trade-off treatment: the higher the temperature - the greater longevity and lower density, and strength. Class 1. Treatment is carried out at temperatures above 190 ° C. No significant changes in the physical properties of the material does not occur. The main purpose of the regime - to give some fine properties of wood: its color darkens and becomes brown, reddish or yellowish tint. Thus treated wood is recommended in those cases that have not undergone heat treatment. Class 2. Temperatures above 210 ° C. As a result of treatment is 3-4 times increased resistance to rot, but also reduces the flexibility and elasticity. From such wood produce quality lumber, Garden design, finishing panels and flooring, furniture for home and garden, windows, doors, etc. Class 3. Treatment is carried out at temperatures above 230 ° C. Thermowood with that class treatment is recommended in cases when you need a very high resistance to decay. For example, for the manufacture of windows, exterior doors, exterior walls, outdoor decks (balconies, patios), fences, structures, playgrounds, etc. Hydrothermal treatment of wood takes place in a special drying chamber.