How to compress and use organic wood?

Wood is a kind of bio-organic material with elasticity and plastic at the same time. Under certain conditions, it can not damage the structure of the wood cell wall. The wood is compressed to produce a hard, high-density, high-strength compressed wood. The emergence of compressed wood began in the early 1930s. Germany first produced compressed wood. Compressed solid wood was called 'LignofolUsed for military components such as antenna masts and propellers of aircraft. Later, it was gradually used in civil appliances, such as handles for textile wooden shuttles, yarn tubes and various tools, as well as some molds. In 1932, the former Soviet Union also formulated the process of producing compressed wood by the furnace heating compression method and the cooking compression method. The United States also has some early patents on compressed wood. In the late 1950s, under the leadership of Professor Shen Zongqi of Beijing Forestry University, my country also began to develop and produce compressed wood to replace precious hard wood, as the grinding ball in the ball mill for the production of explosives, the wooden shuttle in the textile industry, and the coal industry. Anchor rods and so on. At that time, our country produced wooden shuttles in the textile industry. The main process steps used were compressed wood instead of cypress wood and sandalwood. The main process steps used are as follows (the tree species used for compressed wood is generally colored wood, as well as white cowzi wood, red birch, and fruit wood): 1. Pre-compression: Arrange the whole wood shuttle billet to be compressed in each layer of hot pressing model, pre-compressed 5-10%, or not pre-compressed; 2. Pre-heat treatment: steam to reach 130-150 ℃ (press plate temperature), pressure is 80kg/cm2, heat preservation is 30-40min; 3. Compression: pressurize in sections or one time, pressure is 170-300kg/cm2, lock the mold after pressure is stopped, the degree of compression is related to the specific requirements of the product, For example, the weight of a single wooden shuttle should be 330～350g, and its density can reach 0, 86～0, 95g/cm3. 4. Heat setting: heating up to 140～150℃, the center temperature of the shuttle blank is 145±5℃, heat preservation and pressure preservation 40～60min; 5. Cooling and unloading: put cooling water, cool down to 40～60℃ for about 40～50min, then release the pressure of the press; 6. Qualitative treatment: store 3～6 under certain temperature and humidity conditions Month, the purpose is to eliminate the stress in the compressed wood and make it reach the equilibrium moisture content. Related reading: Is furniture with heavier wood better? However, as in the above process, the disadvantage of compressed wood without fixing treatment is that it is unstable in size. It will absorb moisture and rebound when immersed in water or in humid air, returning to its original shape and size. Of course, on the other hand, we can use the resilience of compressed wood as a compacting material, such as finger joints, anchor rods and so on. However, it is precisely because of the resilience of compressed wood that the wide application of this product is restricted. Since the emergence of compressed wood for a long period of time, compressed wood has not been greatly developed in the world. Since the 1980s, in Japan, and later in other countries, including China, there has been a wave of research on compressed wood. The reason is that Japan, as well as many countries in the world, are facing the problem of using more and more fast-growing timber. Therefore, the focus of research is mainly on the wood of fast-growing tree species with low density and low strength, such as Japanese cedar, Chinese fir and poplar in our country. At the same time, how to permanently fix the deflection of compressed wood and the mechanism of wood deflection and fixation have become very critical issues. In this field, Japanese researchers such as Norimotokyo, Iida, Inoue, etc. have made a lot of exploration and made outstanding achievements. At present, there are mainly four treatment methods for permanent fixation of compressed wood, which are heat treatment, water vapor treatment, phenolic resin and other resin treatment, and cross-linking treatment with formaldehyde. Wood compression also includes overall wood compression, wood surface compaction, log shaping and compression, veneer layer compaction and so on. During his Ph.D. study, the author also made a systematic study on the permanent fixation mechanism of heat-treated Chinese fir compressed wood and published a series of papers. As a means of wood modification, wood compression effectively improves the density, strength, hardness, wear resistance and other physical and mechanical properties of wood, and can broaden the use range of fast-growing wood. Therefore, compressed wood has a certain market prospect. (Source: Wood)
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