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Forest industry - one of the oldest industries in America. Legend has it that Leif Erikson, who allegedly visited North America around 1000 year, returned from the New World with a load of logs! It is known that one of the first products brought to England from Jamestown colony were of virgin timber forests.
Many tree species used for construction and other purposes. The most softwood put pine, fir, Hemlock, spruce, white fir, cypress and redwood. Hardwood trees are used to make furniture, flooring, and these include oak, kamednoho tree, maple, poplar and walnut.
Once on the sawmill, a log can be sawn lengthwise into two or more parts. Then the beam hits the truck and transported on conveyor. The log is kept securely and the cart moves to the top of the conveyor. The deck comes in contact with a saw, which disperses sigeduca it along. This continues until the deck is not divided into several boards of desired thickness.
Then these boards are cut edges, they prostrahivayutsya and sorted. Now they have to be dried before they go into business. sigeduca It held that the weight svezhenapilennyh boards is two-thirds water. If this wood is used immediately, it vysohshy it pozholobytsya and crack.
Some boards sigeduca are dried in the air in the feet, which can take anywhere from a month to a year with superfluous. But this method of drying is still 15-20% water. Another way is that the boards are placed in a heated dryer. Here lumber drying from two days to two weeks, and the water is reduced to a very small level. For wood floors and furniture should be as dry as possible, although for most items 15% humidity are the norm.
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