Technology progress of wood protection

  In Europe, heat-treated wood is widely used in building construction, some large and small buildings and even the skeleton of the walls, and application of this material, and in the garden furniture, wooden fence, and also widely used in doors and Windows. Last year, Finland has established new rules in civil market sales of chemical varnished wood and its products is allowed, only sales of heat-treated wood and its products. The United States has also banned the import of the CC, CCA this copper chromium arsenic salt compounds treated wood and wood products. This decision prompted Canadian timber industry as an alternative to chemical processing method using the method of heat treatment to protect Spruce wood (Spruce). Famous Ikea (Ikea) also ban the use of boric acid to deal with rubber wood. Thus poses a great threat to southeast Asia, the ban means all rubber wood in the original export markets will be fired out.

  Can be heat treatment of wood species are constantly increasing, every kind of new species must be detailed laboratory research, and then can carry out production on a large scale. But for southeast Asian countries, most interested in is rubber wood heat treatment technology. The tree species of wood have become the most rapid drying of wood, to dry faster than pine, even from the wet material dry to a moisture content of 6-8%, only need to 22 hours.

  1. The complicated process

  In wood heat treatment process, the process of temperature rising process is very rapid, at the beginning of the risen to more than 100 ℃, and then in a short time increased to 200 ℃ to 250 ℃. Within 35 hours, starting from the kiln temperature 50 ℃ not intermittently heated, so as to complete the whole process.

  Drying medium can kill bacteria, evenly penetrate inside the wood, and to maintain a positive pressure state (slightly higher than that of external atmospheres), exhaust to the kiln. In spite of the high temperature furnace energy utilization rate is quite high, this is because in the process of drying, don't have any fresh air into the furnace, so little oxygen in the drying medium, more stable, is mainly formed by the evaporation of moisture from the wood of the steam.

  2. Applications use different standards

  European authorities have released different temperature levels of the standard heat treatment. Now these standards has become an informal international standards, T4 and T5 standards for indoor use, D1 to D3 standard for outdoor use. According to different used in processing temperature, the wood can produce varying degrees of color change, even when handling cycle also.

  T5 is suitable for dark wood natural color can only slightly, the appearance of change will not affect the properties of wood. European consumers now popular tend to deeper color, because they think the color appear exalted.