New timber literacy

1, fire wood:

The Institute of Wood Research at Kyoto University in Japan developed a wood that is not afraid of fire, that is, adding inorganic salts to the fire-resistant materials, and immersing the wood in a solution containing cerium ions and phosphoric acid ions successively to produce an inorganic layer of strontium phosphate salts inside the wood. Wash and dry afterwards. Beds, furniture, walls and ceilings made of this fire-resistant wood will not be burned even if the carpet in the room is on fire. The wood is also resistant to decay and termites.

2, super wood:

The McMillan Company of Canada has developed a kind of super timber which is the same as steel but cheap. This kind of super wood is made by cutting round logs into sheets and processing 2-3 m of strips, which are then bonded together with resin and cured with microwaves. The super wood has the elasticity of traditional wood, high seismic resistance, and can replace steel for commercial and civil buildings.

3, colored wood:

Japan's Oita Prefecture Forestry Testing Ground introduced a colored wood. Put the red and cyan salt-based dyes into the hose and inject them directly into the trunk of the fir tree near the roots. After 4 months, the boards can be harvested and cut. The wood is completely the same from top to bottom and never fades. It is made into furniture. No need to paint landscaping.

4, composite wood:

Japan's building materials industry and the chemical industry are cooperating to develop a PVC hard, high-foam material, artificial wood. The main raw material is polyvinyl chloride, and the addition of an appropriate amount of flame retardant to make it have a fire protection function. The structure is a single-independent foam body, in which the foam is filled with an inert gas that is heavier than air, so that it has the characteristics of non-conduction, non-transmission, etc., and can play a role in heat insulation, sound insulation, fire prevention, and durability. The wood can replace natural wood for house siding, cubicles, ceilings and other decorative materials.

5, ceramic wood:

This ceramic artificial wood made in Japan is made of high-purity silica and lime processed by high temperature and high pressure, and is made of plastic and glass fiber. The wood is an excellent building material because it is non-flammable, non-deformable, non-perishable, lightweight and easy to process.

6, atomic wood:

The “atom wood” developed by the United States is a mixture of wood and plastic, and then processed by cobalt 60. Since the wood reinforced by plastic is more beautiful than the pattern and color of natural wood, it can be easily sawed, nailed, and polished. Ordinary carpentry tools can process it.

7, chemical wood:

Japan's Tokyo General Chemical Co., Ltd. has developed an injection-molded chemical. The wood is made of epoxy resin, polyurethane and additives. It can be injection-molded in the liquid state and forms the product shape after curing. Its physical and chemical properties and technical indicators are the same as those of natural wood. At the same time sawing, planing, nailing and other processing, the cost is only 25% -30% of natural wood.

8, temperature resistant wood:

Norwegian Moore recently developed a new high-temperature flame-retardant wood. The wood is made by special soaking processing of pine wood and spruce. It will neither catch fire nor spread fire in a half hour at 100°C.

9. Artificial wood:

British researchers have developed artificial sheets made of polystyrene plastic. Polystyrene waste plastic is crushed, heated, and then injected with 9 additives such as a curing agent and a binder to produce a wood-like product. The appearance, strength, and durability are comparable to those of pine wood.

10, special hard wood:

Canada has developed and produced a cover wood that is harder than steel. The wood is treated with special treatment to make the fibers cross each other, then covered with synthetic resin on the surface of the wood and then processed by microwaves. This new type of wood is not bent, cracked or shortened and can be used as a roof beam, doors and windows, and carriage panels.

Overshot Assembly

Overshot go into the heart of the drill pipe, the slider move up, make the tube socket head can be inserted into the center, when on the slider move up tight, using friction lift drill, remove loose again after the slider, by means of the connection string to slide along the block should tighten, set aside the center pipe, but in front of the salvage must first determine the bit in the bottom of the hole position, can be in a thin plate with bolts tight end of drill pipe, Drop the drill pipe to the bottom of the hole and press it on the drill bit. After waiting for a moment, it is proposed that the relative position of the drill bit at the bottom of the hole and the center of the rotary plate of the drill can be determined by observing the indentation left by the center pipe of the drill bit on the board, and then move the drill or rotary plate so that the center of the rotary plate is directly in front of the center pipe of the injured head, so as to ensure that the fishing device can be inserted into the center pipe accurately.

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