American Black Walnut: American black walnut is commonly referred to as American walnut, or simply black walnut, and the English trade name is American black walnut. Produced in North America is one of the most valuable hardwood species known as the king of American hardwoods. The American black walnut distribution area is located at 35-45 degrees north latitude. Between 80-120 degrees west longitude, California and West Texas in the eastern United States and the west coast of the United States. This section belongs to the temperate continental climate. The climate is characterized by four distinct seasons, cold and long winters, slow tree growth, long growth cycle, high late wood rate, hard material, fine texture, good dimensional stability, and expansion and contraction rate. Small, the product is not easily deformed. The growth wheel of the tree shows obvious characteristics of the annual ring due to the stop of growth in winter. After cutting, it will show beautiful patterns. American black walnut is a walnut family, hardwood wood. The pipe hole is fine, the cutting surface is smooth, the material is fine, and it is easy to engrave, and the air dry density is 0.66-0.69 g/cm 3 . This is a perfect density. The black walnut tree can be as long as 150 feet tall and has a diameter of 2-4 feet (0.6-1.5 meters) at the chest. The heights of 70-100 feet (1 foot = 0.3048 meters, 21-30 meters) are more common, and the diameters above and below the trunk are also uniform. The growth cycle can reach hundreds of years. The surface wood of American black walnut is milky white, and the heartwood is light brown to brownish black. Only the middle wood corrugated or curved wood grain has a decorative pattern, and the yield is lower than other woods, less than 30%. . The charm of black walnut comes first from its pattern texture: not only the string cut surface has a beautiful large parabolic pattern (large mountain pattern), but also the curves that other trees do not have, waves, scrolls, rafters, small nail-sized "birds" Scar" knot. At the same time, it is engraved with black-gray strips or strips, which are varied and pleasing to the eye. The charm of black walnut comes from his hue: the sapwood is milky white, and the heartwood is from light brown to dark chocolate. Black, dark gray, light gray, dark brown, light brown, brown red, golden, light yellow, green yellow, turquoise, colorful, layered, contrasting, full of jumping. Especially occasionally there will be rare purple and stripes of noble and auspicious - purple gas to the east. Dark, noble, singular, and luxurious, these words are a proper description of the American black walnut as the king of the American hardwood. Processability: Black walnut is very expensive. Furniture is usually made of wood with very little wood. Traditional veneer can be used for piano surfaces and interiors of high-end cars and yachts. The most precious California black walnut eucalyptus is used in Rolls Royce, Bentley. , Maybach, Lamborghini, BMW Mercedes and other world famous cars. In the antique furniture of the royal aristocrats preserved in the palaces of the Louvre, Versailles, Buckingham Palace, and Swan Castle in Europe, American black walnuts are used as the main material. In particular, French Louis XV furniture was named "Walnut Age". Since ancient times, American black walnuts have been the royal aristocrats of the West. The preferred materials for the upper-class people to make furniture are called "aristocrats in hardwood." Black walnut is an endangered tree species in the United States. The monthly limited export will not exceed 2000 cubic meters, and the price will increase year by year. The current price is about 18,000-23,000 yuan/m3. Furniture is the carrier of art and culture. If red sandalwood and huanghuali represent oriental culture, then American black walnut symbolizes Western civilization. The status of both is equal and honorable. American black walnut reflects a low-key noble, introverted luxury, he is noble, but not proud, he is luxurious, but not publicity, this is the Western gentleman style and aristocratic culture. Public facility installation example In the United Kingdom, there are countless examples of black walnut applications in the United States. The most famous is the new podium of St. Paul's Cathedral and the new joinery at the Asimolin Museum in Oxford. European walnut: Ø The Juglans regia is small and rarely reaches 75 feet in height, and the wood produced is much shorter. Ø European walnut is native to Turkey and east to Kashmir. Ø European walnut wood is rough and uneven in color. Ø European walnut has low rigidity, moderate flexural strength and seismic strength, but has good impact resistance. Trade name: Named according to the country of origin, such as British walnut, French walnut, Italian walnut, cherkasia walnut, Persian walnut. Geographical distribution: Europe, Baotuo, Asia Minor and Southwest Asia. General characteristics: The heartwood is different in color depending on the place of origin, generally grayish brown, but with darker, irregular smoke brown stripes. The texture passes through the wavy texture and the structure is quite thick. Patterned wood sometimes forms an obvious central part. Mechanical properties: medium flexural strength and impact strength, high compressive strength but low toughness. Steaming and bending effect is good. Machinability: It is easy to use manual processing or machining. The degree of wear on the tool is moderate. After processing, good wood surface effect can be obtained. The nail holding force and the holding screw force are good. The adhesive performance is good. The surface after polishing is very smooth and pleasant. . South American Walnut (Walnut, South American) Latin name: juglans neotropica, Diels.,; J.columbiensis, Dode; J.autralis, Gris. Walnut. Product Name: Peruvian Walnut Geographical distribution: Peru, Colombia, Ecuador, Venezuela, Argentina and Mexico. General Features: The diameter section presents a dark brown color in the United States with a black striped pattern. The texture passes until the wavy texture. The structure is quite thick, with an average density of 650 kg/m3 and a specific gravity of 0.65. Mechanical properties: medium flexural strength and impact strength, high compressive strength but low toughness. Steaming and bending effect is good. Material density and elasticity. Machinability: It is easy to process by hand or machine. It has good gluing property, good grip strength and holding screw force, moderate wear degree to the tool, good wood surface effect after processing, after planing and sanding. Get a silk-like surface that is polished and polished. There is a species of white walnut (Butternut, Butternut, Juglans cinerea) in the United States. Its material is light and soft, its color is grayish, its specific gravity is about 0.43, and its grade is lower than that of black walnut. It is used for lower quality products and Size requirements are less stringent.
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Black walnut texture and hue:
It is easy to machine by hand or machine, and the degree of wear on the tool is moderate. The nail holding force and the holding screw force are both good, the bonding performance is good, and the excellent performance processing effect can be obtained.
The value of black walnut:
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Comparison of Walnuts in the United States, Europe, and South America