Knowledge of wood? The basic meaning of wood

Wood is made up of various cells in a tree that grow along the trunk, branches, and branches, and these cells are basically made of cellulose, which are glued together by a substance called lignin.

You can think of a piece of wood as a bundle of straw sticks glued together. These sticky straws are difficult to break at the waist, and it is relatively easy to separate them from each other. This is why wood is more likely to crack along the grain rather than transversely to the grain.

The different growth characteristics of a tree can be seen from the cross-section.

The outermost bark is the bark, the outermost of which protects the forest from damage and wear and tear by animals and the natural environment; The bark on the other hand transports nutrients produced by photosynthesis of leaves into a thin layer of living cells called cambium.

The growth of all trees occurs in the cambium layer. The cells of the cambium grow outward to form new bark, and inward to become new wood. Every year the cambium grows inward with a new sapwood outer ring, which is mainly used to transport water from the roots to the upper part of the tree.

As the cells grow, the innermost layer of the sapwood gradually pushes its ability to transport water, slowly hardening into the heartwood, which is the darker part of the trunk in the middle. The central part of the trunk is called the pith.

In most climates, woods grow faster in the spring than in the summer. Within the same growth ring, this phenomenon is embodied in changes in density and color. The inner part of each ring is called spring wood, which is formed in the spring when the trees are in full bloom, and their cells are larger than those that grow in the summer, and they are different in color.

The three stages of wood identification.

The first order: ordinary wood readers, that is, they can cope with the wood they are interested in. (Because even furniture makers have very limited wood to use).

Second Order: Reading Wood, it is actually difficult to become a Master of Wood Reading, you have to apprentice, that is, in college, majoring in botany or biology, you have to grasp the distribution of various trees on the earth, the influence of different climates on species, and there may be hundreds or thousands of species of plants in the same family, you have to understand their differences.

The third order: read the wood god, and then distinguish the type of wood, at the same time, can understand the type of wood, judge the year of furniture production, judge what the furniture has experienced, and estimate what impact the environment has on the wood, which requires a lot of practical experience.

Wood is a common building material with a wide range of applications. Here are some basic things to know about wood:

Structure of wood: Wood is composed of cellulose, hemicellulose, and lignin, among others. Cellulose is the main component of wood, giving it strength and toughness.

Classification of wood: Wood can be classified according to tree species, color, texture, and use. Depending on the tree species, wood can be divided into softwood and hardwood. According to the color, it can be divided into light wood and dark wood. According to the texture, it can be divided into straight-grained wood and staggered wood.

Properties of wood: Wood has some unique properties such as lightweight, insulation, sound absorption, breathability, etc. In addition, wood also has a certain strength and durability, which can resist some external forces and environmental factors.

Processing and treatment of wood: Wood can be processed by cutting, sawing, planing, etc., to meet different needs. In addition, wood can also be treated by drying, antiseptic, painting and other treatments to improve its service life and performance.

Application of wood: Wood is widely used in construction, furniture, flooring, packaging, shipbuilding and other fields. The natural beauty and eco-friendly properties of wood make it one of the materials that people love.

Wood protection: In order to prolong the life of the wood, some protective measures need to be taken. Common wood protection methods include antiseptic treatment, waterproof treatment, insect repellent treatment, etc.

Sustainability of timber: Since the quality of timber is closely related to forest resources, the protection of forest resources and the realization of sustainable timber development have become important issues. When using wood, attention should be paid to rational use and recycling.

The characteristics of wood have the advantages of light weight, high strength-to-weight ratio, good elasticity, impact resistance, rich and beautiful texture tone, easy processing, etc., 1. Nature: Wood is a natural material, and only it is taken directly from nature in the four main materials of steel, wood, cement and plastic commonly used by human beings, which makes wood have the characteristics of low production cost, low energy consumption, non-toxic and non-polluting.

2. Good texture: wood has good tactile properties that are easy to accept, far better than materials such as metal and glass.

3. High strength-to-weight ratio: The ratio of some strength to weight of wood is higher than that of general metals, and it is a light and high-strength material.

4. Temperature insulation: The thermal conductivity of wood is very small, compared with other materials, the thermal conductivity of aluminum is 2000 times, and the thermal conductivity of plastic is 30 times. Therefore, wood has good thermal insulation properties!

5. Electrical insulation: The point conductivity of wood is poor, and it is a better electrical insulation material.

6. Machinability: The wood has a moderate degree of softness and hardness, and it is easy to process.

7. Decoration: Wood itself has a natural and beautiful pattern, and as a furniture and decoration material, it has good decoration. Due to some of the above-mentioned unique characteristics of wood.

Wood Cloud Wood Encyclopedia.

Wood is a common raw material for construction, furniture, arts, crafts, etc., and has a wide range of uses. The characteristics of wood mainly include the following aspects:

Texture: Different types of wood have different textures, some are soft and some are hard. The texture also affects the weight and density of the wood.

Texture: The grain of each wood is different, some of the wood has a clear grain, and some of the wood has a blurred grain. The characteristics of the grain can also affect the aesthetics and performance of the wood.

Color: Different kinds of wood have different colors, some are dark in color, and some are light in color. Some woods also take on different colors in different light.

Durability: Different types of wood have different durability, some wood is easily rotten and subject to insect infestation, while others are highly durable.

Plasticity: Wood is very easy to process and deform, and can be processed into a variety of shapes and structures.

Stability: The stability of wood can be affected by factors such as humidity and temperature, and different types of wood have different adaptability to the environment.

Acoustic properties: Wood has good acoustic properties and can be used to make musical instruments and speakers.

In conclusion, different types of wood have different characteristics and uses, and choosing the right wood can improve the quality and durability of the product. At the same time, understanding the characteristics of wood also helps to properly protect and maintain wood products.

Wood is a lignified tissue formed by plants that can grow secondarily, such as trees and shrubs. After the primary growth of these plant segments is completed, the vascular cambium in the rhizome begins to fibrous activity, developing phloem outward and wood inward.

Wood is a general term for plant tissues that develop inward from the vascular cambium, including xylem and parenchyma. Wood plays a great supporting role in human life. Depending on the different properties of wood, people use them in different ways.

Timber generally refers to the wooden materials used in industrial and civilian construction, and is often divided into soft and hard wood.

Wood has very good mechanical properties, but wood is an organic anisotropic material, and the mechanical properties of the grain direction and the horizontal grain direction are very different. The tensile and compressive strength of timber are high, but the tensile and compressive strength of the sgrain are low.

Timber strength also varies from tree species to tree species and is affected by factors such as timber defects, load action time, moisture content and temperature, among which wood defects and load action time are the most affected. Due to the different size and position of the knots, and the different force properties (tension or compression), the strength of knotted wood can be reduced by 30 to 60% compared with knotless wood. The long-term strength of the timber is almost half of the instantaneous strength under long-term load.

Lightweight: Compared to other building materials such as steel and concrete, wood is a lightweight and less dense material.

High strength: Although the wood is relatively light, it is superior in strength. Dense hardwoods, such as nutwood, are more resistant to compression than thin pine.

Good toughness: In addition to high strength, wood also has good toughness, that is to say, it can withstand the action of external forces and is not easy to break.

Durability: With proper treatment, wood can be used for a long time and is more resilient to climate change. Although it has a certain decaying effect, it can be effectively antiseptic after treatment.

Easy to process: Wood is easy to process and engrave compared to metal materials, and can be made in any imaginable shape and size. This makes it a very flexible material that can be used in a wide range of indoor and outdoor buildings.

Aesthetics: Wood is very decorative, and its natural properties make it ideal for creating a soft, comfortable home atmosphere and design.

Renewable: Wood is a renewable material that can be produced sustainably through afforestation and reduce the negative impact on the environment.

Rich grain: Each piece of wood has a unique grain and color, making it suitable for interior decoration as well as for furniture and crafts.

Thermal insulation: Wood is able to perform well in terms of thermal insulation and heat storage, which makes it a more environmentally friendly choice.

Health and environmental protection: Wood is a healthy and environmentally friendly material, there is no radioactive pollution, and it emits a small amount of carbon dioxide in the production process, which has environmental advantages compared with other materials.