Uses of wood
Wood
Wood is a generic term for a material made of wood quality or wood quality . It can be obtained mainly from woody plants including trees, but can be obtained from plants with tree trunks. In particular, the expression “log” is used when referring to “a tree that has not yet been processed as it was cut”.
Summary
The tree's roots, stems, branches, or the whole tree are used for timber, but except in special cases, the tree trunk is usually used. There are conifers and hardwoods in wood, each of which has different components. The main ingredients are cellulose, hemicellulose, and lignin, and other minor ingredients are also included. The specific gravity varies depending on the species, but in general, it is in the range of 0.3 to 0.9 for conifers and 0.2 to 1.3 for hardwoods. It contains about 15 moisture under normal atmospheric conditions and swells and contracts according to moisture absorption and desorption. Uses vary depending on the type of construction, furniture, packaging box, ship, vehicle, timber, sleeper, electric pole, musical instrument, sports equipment, plywood, etc.
Then, it is dried to produce raw materials for chemicals such as wood gas, wood tar, acetic acid, methanol, and creosote.
History
A 2011 discovery in New Brunswick, Canada, revealed the first plants of large wood, estimated to be about 395,000,000 to 400,000,000 years old. The age of wood can be determined through carbon dating, and for some species, the timing of wood was inferred through the annual chronology.
Humans have been using wood for hundreds of years for numerous purposes, especially fuel and building materials to build houses, fire, tools, weapons, furniture, packaging, art, and paper. The year-to-year changes in the width of the rings and the abundance of isotopes provide a clue that the climate prevailed at the time.
In addition, there are many uses such as various furniture, tableware such as pencils, doors, wooden chopsticks, and kitchen utensils. In particular, they have been consistently used as crafts and furniture materials that utilize the soft feeling that only wood can bring. Crucially, modern paper is obtained by processing wood. Originally, paper was made from fibers extracted from old clothes, but making paper from pulp made from wood is cheaper and can be made much faster. Even now, in France and other places, high-quality paper, not ordinary paper, is made by changing old clothes.
The main components of wood consist of 41-43% cellulose, 20-30% hemicellulose, and 23-23% lignin. Cellulose is a polysaccharide composed of glucose and is the main component of the cell wall of plants. Hemicellulose is a type of heteropolymer. Like cellulose, it is found in plant cells, but its properties are very different. Cellulose is crystalline, whereas hemicellulose is amorphous and cellulose is strong in hydrolysis, whereas hemicellulose is weak in hydrolysis. Lignin is a polymer of aromatic alcohols, a substance found in many plant cell walls. Separating this lignin from cellulose is an important task in the paper making process.
Waste wood can also be recycled. In particular, large-sized waste wood can be recycled and used without any problems if it is appropriately processed after selecting what is useful. The difficulty of wood as a building material is to warp as it dries, but waste wood has already undergone deformation, so there is no such concern.
It is a softwood (softwood), which has weak surface strength but has good strength compared to its weight, and is a very large and straight-growing tree that is widely used as a skeleton of wooden buildings (mainly lightweight timber structures). In the past, it was often used as a mast for sailboats because of its unique strength-to-weight ratio. In Korea, spruce laminated boards are imported from Turkey, Germany, Austria, and China (Swedish logging), and solid laminated products (products made of wooden boards by cutting and attaching a side and pressing) are the mainstream. It is a standardized structural tree in the United States and Canada, and is especially imported as a SPF (Spruce Pine Fir spruce, pine, fir) structure product processed by cutting all pine trees.
It is generally white wood, but has a slight yellow or red aura. It has a beautiful wood grain and features small knots, and it is soft wood, so it is easy to work with, and there is oil enough to feel the gloss on the surface. Among the pine trees, it is the lightest axis, and as described above, it has excellent strength to weight, but inversely proportional to it, the deformation due to sunlight or climate is severe among other pine trees. Therefore, it is necessary to carefully consider the dry condition for the purpose of use.
In addition to this, softwood (softwood) mainly used in Korea includes cedar (cedar) from China, obisgi (cedar from Japan's Obi region), hinoki (cypress), and larch from Japan. Obi cedar is different from Chinese cedar in scent and has a more detailed structure. The price difference is also huge.
Hinokis are almost felt to have the same strength as pines. The weight is certainly heavier than cedar. It is highly resistant to water and is distributed very expensive because of its effect related to phytoncide.
If you want a tree with good strength at an affordable price, Eliot Pine is a good choice. In addition, radiata pine and spruce are also fine. Among softwoods, Larch has a brilliant pattern and is often scattered. It is mainly made of plywood or embossed to be used as flooring or louver.
Overall, soft wood is known to have a high content of phytoncide, and it tends to be resistant to decay and pests.
Hongsong is a wood used to make traditional windows and furniture. It is a different wood from red pine, and it is a pine tree that grows in China. But the same pine tree
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