Introduction of cork, a common material for the bottom plate of table tennis bat;
The outer bark of Quercus variabilis is a subsidiary product of wood, which is a precious renewable green resource, mainly growing in the Mediterranean coast, with an annual global output of only about 350,000 tons, of which Portugal accounts for about 50%, with the best quality. Different from hardwood and other wood materials, cork contains almost no wood fiber, but consists of countless air-filled cells (about 40 million cells per cubic centimeter), which has unique physical and chemical characteristics. Cork has unparalleled excellent characteristics: non-toxic, mellow, non-moldy, non-decaying, insect-free, elastic, insulating, waterproof, wear-resistant, acid-base resistant, flame retardant, and has excellent sound insulation, sound absorption, vibration isolation and vibration absorption. The thermal conductivity of cork is very low, and the temperature is constant at about 23 degrees. Therefore, cork is an excellent thermal insulation material. Due to the above characteristics and its extremely high physical and chemical stability, its service life greatly exceeds that of other wood materials. In addition to natural cork, there are compound cork: that is, cork particles with high grade and moderate size are screened out and pressed into blanks with a certain density. Corks are generally used as handles for ball boards.
Introduction of common materials for table tennis bat bottom plate;
A fast-growing deciduous tree, including Phoenix, Paulownia, Tung, White Paulownia, Red Paulownia, etc. Wood is light and tough, and can be used to make musical instruments (guqin, etc. ), airplane models, boxes, furniture and so on. Because it is easy to obtain in Asia, it is regarded as the core material of flooring by most Asian flooring manufacturers. Except for the French phoenix tree, there is no such material for floors in other countries (if there is, it should be processed in Asian countries). The weakness of this wood is its low strength. When making the floor, if the structure is not well matched, it is easy to break when using it. However, due to the crisp sound quality, it is often used to manufacture high-grade floor boards; The hardness of each part of wood is very uneven, so many manufacturers use it as a core board after splicing to achieve the purpose of uniform elasticity; On the other hand, its deformation rate has also decreased to a great extent.
[Sabina vulgaris] (Guangxi) Introduce the commonly used materials for the bottom plate of table tennis bat.
It is called cypress in Chinese mainland, cypress in Taiwan Province and Japanese cypress in Japan. This kind of wood is very rare, only found in Japan, Taiwan Province Province and North America. It is a rare living fossil heritage (the world's top natural heritage) in Paleogeography in Tertiary. Sabina vulgaris: Sabina vulgaris, Pinaceae, evergreen tree, dioecious, with spherical fruit and scaly leaves, namely Sabina vulgaris and Sabina vulgaris; Castanopsis kawakamii is a specialty of Taiwan Province province, and its scientific name is chamaecyparis formosensimats. , commonly known as "thin skin". As the name implies, the bark is thin, the crack is shallow, and its wood is reddish, hence the name "Castanopsis kawakamii". Its wood grows in the mountainous area between 1700 m and 3000 m above sea level, and its leaves are small scales, which are close to the flat branches and face each other. Its wooden floor is soft and firm, with grease inside, slightly fragrant but not pungent, durable and corrosion-resistant, and it is the material above the building. In the early days, Japan imported a lot from Taiwan Province Province. There are Japanese-style buildings in Taiwan Province Province
Its beams and columns are mostly cypress trees; The famous Shenmu in Taiwan Province Province: Alishan Shenmu and Xitou Shenmu are both red thorn cypress trees. Platycladus orientalis: the common name is thick shell pine and cypress, and the scientific name is Taiwan Platycladus orientalis Masam. The heartwood is yellow and exhausted, hence the name "Bai"; It can be used in architecture and pencil manufacturing. In Taiwan Province province, it is mainly used to make bath barrels and health steam stoves; Because of the rich aroma of cypress in Taiwan Province Province, the refined cypress powder extracted from its wood has a natural anthelmintic effect, which has won the reputation of being non-rot for a hundred years in the world. It is widely used as raw materials for medicine, cosmetics and food in Germany, Japan and the United States, and is deeply affirmed. Relevant experts have determined that cedrol in Taiwan Province Province contains anticancer components; At present, there are only two large-scale natural Berlin in Taiwan Province Province, one is the Qilanshan forest area in the north and the other is the Xiuguluan business district in the east. These forests still exist in Bao Dao's world-class giant forest environment, which is the ecological succession environment of Taiwan Province, where the world migrated, and the most important natural relics have been preserved.
Introduction of common materials for table tennis bat bottom plate: Japanese cypress;
This kind of wood is a unique coniferous tree species in Japan, which mostly grows in Muzeng area, Guandong Mountain, Mu Yi Peninsula and Shikoku in the middle, especially in Muzeng area, where there are vast natural forests and artificial forests. This tree is a big tree, with a height of 30m and a diameter of 2m. Its bark is reddish-brown to dark reddish-brown, its scales are large, it splits and falls off longitudinally, its endothelium is purple-red, its wood texture is flat, its heartwood is red and yellow, and the difference between the edge heartwood is not obvious. This kind of wood has a special fragrance, excellent durability and easy processing. Uses: It is most suitable for building materials, furniture, home appliances, sculptures, etc. Alnus cremastogyne has the characteristics of light weight, high elasticity, resistance to microbial and chemical solvent corrosion. , widely used by Japanese flooring manufacturers in panels, core boards and even the whole board body. The floor made of alder is suitable for arc fast attack, and the one-sided straight board is more suitable for arc fast attack. However, due to this kind of wood, some of them are made by splicing two or more pieces of wood. We can evaluate the production level of flooring manufacturers from the fineness of splicing. Although such a floor is spliced, it should not affect the performance.
Introduction to the commonly used materials of the bottom plate of table tennis bat [Ayou] (transliteration: Ayous or Ayus);
Also known as [abachi] and [Obeche], they are produced near Gabon, Africa and China and are often used by model aircraft manufacturers to make wing surfaces. This kind of wood is light and tough, and its hardness is between that of basswood and paulownia wood in China. It is often used as the panel and core material of the floor by foreign manufacturers such as Butterfly and STIGA and domestic manufacturers such as Galaxy and Palio, such as 992# of Galaxy. All the wood is made of Ayous and carbon fiber.
Koto: the transliteration of Koutou, produced in Africa, Asia and other places, is brittle in material, long in fiber and moisture-resistant. Many Asian and European flooring manufacturers generally use this kind of wood as floor panels, and its performance is close to Limba!
Introduction of common materials for table tennis bat bottom plate [basswood satin wood];
The general name of Tilia plants [Tilia China]. There are more than 30 species of this genus in China. Tilia lindens is a deciduous tree. Like poplars, Tilia lindens has better wood, which can be used to make steamers, pencils and matches. For example, Tilia amurensis, Tilia amurensis and Tilia amurensis are divided into Tilia amurensis and Tilia amurensis according to wood color; This kind of wood was first used in rackets in China, and every floor was made of basswood. For example, most products such as Old Double Happiness, Friendship and Meteor are made of basswood. Tile is the fatal weakness of basswood. The weight of the early floor seen now is at least 105g. All basswood flooring has occupied a large proportion for a long time (nearly 40 years), mainly adapting to the straight and fast attack style at that time; Now, in order to make the floor lighter, many manufacturers try to replace it with other wood or combine it with other light wood to make the floor.
Introduction of common materials for the bottom plate of table tennis bat [(Sika) spruce] spruce;
Spruce, an evergreen tree of Pinaceae, has dense leaves and a conical crown. Small trees (potted plants) are widely cultivated and appreciated. This kind of wood is getting less and less, and logging has been banned in China. Spruce is a kind of light, soft and medium-strength wood with less resin content than pine, which is especially suitable for making doors, window frames and musical instruments. The really good raw materials come from the virgin forests in the Pacific Northwest, and many of them have been cut down. The best wood is very straight and dense, which is widely used by tool makers (this is the best wood for making * * * soundboards); Spruce wood has medium hardness, milky white or light yellow, straight grain and even and dense annual rings. The floor made of this kind of wood is more suitable for European arc fast attack.
Introduction of common materials for table tennis bat bottom plate [Lao An] eucalyptus;
There are two kinds of eucalyptus: white eucalyptus and red eucalyptus. Eucalyptus alba, an evergreen tree, has tall and straight trunk, thick wood structure, straight or patchy texture, easy drying and processing, and good nail, coating and glue properties; Eucalyptus rubra, the wood structure texture is also like Eucalyptus alba, and the radial section pattern is beautiful, but it is difficult to dry. During the drying process, eucalyptus globulus will slightly warp and crack. Eucalyptus is hard, brown-eyed, long in fiber, elastic and easy to deform.
Most amateurs in the market are a combination of Ayous and spruce, and some will add some carbon.