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Due to the wide variety of broadleaf, it is collectively called miscellaneous wood. Among them, the material is soft and soft, such as poplar, paulownia, balsa wood, etc.; the material is hard and heavy, such as paralyzed, green scorpion, wood lotus, sweet gum and so on.
Classification of wood materials:
1. According to tree species: divided into coniferous trees (such as pine, cedar, etc.) and broad-leaved trees (such as eucalyptus, birch, poplar, etc.).
2. According to the purpose, it is divided into three categories: original strip, log, and sawn timber.
3. According to the material, the logs are divided into one, two, three, etc.; the sawn timber is divided into special, first class, second class, third class, etc.
4. According to the weight of the volume, it can be divided into light materials - the weight is less than 400 kg / cubic meter. Medium material - the bulk density is 500~800 kg/m3. Heavy material - capacity is greater than 800 kg / cubic meter.
Common wood:
1. Pinus koraiensis: soft and soft material, moderate strength, good drying, water and corrosion resistance, good processing, finishing, coloring and cementation.
2. White pine: light and soft, flexible, fine and uniform structure, good drying, water and corrosion resistance, good processing, finishing and coloring. White pine is stronger than red pine.
3. Birch: The material is slightly hard, the structure is fine, the strength is high, and the processing, painting and bonding are good.
4. Paulownia: The material is very soft and soft, the structure is thick, the water-cut surface is not smooth, the drying property is good, and the shape is not cracked. .
5. Elm: The material is slightly soft and soft, the structure is slightly thin, it has silky luster, it is not easy to crack, and it is processed, painted, colored and cemented. Not resistant to corrosion, slightly warped when dry.
6. Ash: The material is slightly hard, the pattern is beautiful, the structure is thick, easy to process, toughness, good finish, good glue and dryness.
7. Elm: beautiful pattern, thick structure, good processing, finishing, good glue, poor drying, easy to crack and warp.
8. Elm: Hard material, thick structure, high strength, difficult processing, good coloring, coating, poor adhesion, easy to dry, easy to crack.
9. Elm: Hard material, straight texture, fine structure, wear-resistant and shiny, not easy to deform when dry, good processing, finishing and gluing.
10. Maple: moderate weight, fine structure, easy processing, smooth cutting surface, good finishing and gluing, warping when dry.
11. Elm: moderate weight, fine structure, aroma, not easy to deform when dry, good processing, finishing and gluing.
12. Willow wood: medium material, slightly thick structure, easy processing, good bonding and finishing properties. Slightly cracked and warped when dry. Plywood made from willow wood is called the Philippine board.
13. Rosewood: Hard material, texture, medium structure, corrosion resistance, not easy to dry, smooth cutting surface, good finishing and gluing.
14. Red sandalwood (redwood): hard material, texture, thick structure, durable, shiny, smooth cutting surface.
15. Wood-based panels, commonly used are plywood, plywood, fiberboard, particle board, hollow board and so on. Due to the different combined structure of various wood-based panels, it can overcome the shortcomings such as expansion and contraction, warpage and cracking of wood, so it is used in furniture and has many advantages.
Precautions for selecting timber:
1. The wood should not crack, no warping, positive color, and smooth texture.
2. Wood cannot be decayed, discolored, or infested.
3. Must be dried and the moisture content should not exceed 15%. The Beijing area should be within 12%.
Consumers often encounter such problems when buying floors, furniture, and wood products. The ones that they bought and what they originally looked at are not a variety. The reason is that there are many kinds of wood, and the names are different. Consumers are easily deceived. . In order to regulate the name of imported timber, in order to regulate the market, and also for the needs of relevant government, enterprises, individuals, and departmental enforcement, the State Forestry Department has established the name standard for imported timber.
The wood commonly used in production comes from the wood of conifers and broad-leaved trees. Because the material of softwood is generally soft, it is also called soft material in production. But this can't be generalized. Some softwoods, such as larch, are hard. Because hardwood is generally hard and heavy, it is also called hardwood.