Jun 17, 2024
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The town of Weed gets its name from the founder of the local lumber mill and pioneer Abner Weed, who discovered that the area's strong winds were helpful in drying lumber.
I hate wind. One man’s trash is another man’s treasure.
6 kinds of traditional methods to identify wood drying
With the continuous development of science, people get rid of the traditional way to detect the degree of wood drying, replaced by the advanced monitoring equipment and instruments, not only measurement accuracy, and more convenient to use and reliable.
But most of the time there is no equipment, still need some simple method to judge the dry degree of the wood.The following simple introduction of several traditional methods for everyone, can be used in the life is simple.The following these is to compare the traditional rough detection way, in the usual life don't need that precise time easy to use.
1, wood.After natural air-dry wood, natural to lighter than water cut wood.To the building materials market to pick, you can use it.
2, wood handle.Touch is relatively dry, nor too cold.
3, knuckles knocking, suggests that more dry, crisp wet voice is relatively heavy.
4, listen to the voice of the carpenter's plane, TuiBao voice clear, smooth plane out of wood, wood shavings of fever, was dry, on the other hand is wet.
5, knead a sawdust, whether you feel dry.
6, good wood under kleenex, 2 days to see if the damp, also can judge the degree of dry wood.
If you need accurate results, further with the aid of the instrument.
(source:http://www.xinandry.com/en/news/wood-drying-85_278.html)
The basic principle and method of wood drying
The basic principle of wood drying is on the premise of guarantee the quality of drying to improve the drying speed, saving energy consumption, reduce the cost of drying.Drying quality refers to: must make be dried wood moisture content and drying uniformity can satisfy the requirement of processing technology;Must also maintain the integrity of the wood craft standard not occurred, do not allow defects, not weaken due to the nature of the wood and its products.The drying speed is to point to: in unit time the degree of lumber moisture content is lower.The faster the drying (or the shorter the drying cycle), need drying equipment and investment is less, the higher the productivity, the less cost of drying.When choosing drying equipment production, according to be dried wood species, specification, quantity, purpose and production unit of realistic condition, etc.For modern wood drying room for drying medium on craft can guarantee of temperature, humidity and air velocity, stow by the external conditions of dry timber basic same, in order to achieve the purpose of uniform drying, safe and reliable in operation, flexible control, small labor intensity of workers.Less investment in equipment, covers an area of small, quick effect, saving energy, it should also reduce the amount of pollution on the surrounding environment as much as possible.
(source:http://www.xinandry.com/en/news/wood-drying-16_275.html)
The defects of wood drying
Wood drying, on the production if the incorrect drying process, the drying of wood will be due to uneven shrinkage, plasticizing fixed deformation and internal stress the role of reason and produce various kinds of defects such as: (1) craze.In cracking area can be divided into different end crack, surface crack, crack (honeycombing) within three, are uneven drying, evaporation rate is differ, the parts have caused by local stress.Prevent drying method is to adjust benchmark, reducing the speed of evaporation.(2).According to the different shapes can be divided into arched (bending) along the lines and curved bending (horizontal stripes).Prevent method is the proper use of every article to stow wood, and on top of the wood pile place heavy objects.(3) warp.Is a kind of compound deformation, bending, arched bending, torsion and often occur at the same time, make the loss of wood use value.Adopt the appropriate state saturated steam treatment, can make the warp degree of relief.(4) shrivel.Wood surface is uneven contraction, the shrinkage is often associated internal crack.Soft benchmark drying, appropriate to reduce the drying temperature, to a certain extent, can prevent the shrinkage.
(source:http://www.xinandry.com/en/news/wood-drying-18_267.html)
Basic knowledge of wood drying
Wood drying method refers to the use of natural and artificial force for wood moisture evaporation dissipation, make the moisture content of lumber moisture content down to conform to the requirements of the use, avoid the wet material in the process of storage, transportation and use of hyphal erosion and wood splitting, deformation and improve the quality of wood products to extend the service life.
Natural lumber drying method is a kind of using gas convection drying.Artificial convection heating and drying methods are so important in the dielectric heating, the former has a dry kiln, solar drying, drying too dry and water liquid centrifugal force;The latter has a microwave drying, high frequency drying.And infrared radiation heating drying and belong to contact heating drying.Both at home and abroad is given priority to with convection heating air drying and kiln dried, especially dry kiln as the major method.
Wood drying is first wood surface evaporation, the moisture content of surface layer is lower than the wood interior, internal moisture move to the surface under the effect of moisture content gradient.At the early stage of the drying speed depends on the speed of wood surface evaporation, the middle and late drying, drying speed depends on the internal moisture movement speed, is inversely proportional to the plate thickness and wood specific gravity.In addition, sapwood drying speed is faster than heartwood.The strings of the hard wood panel dry faster than diameter panel;But softwood string diameter surface no obvious difference.Tree species for drying effect, easy dry wood have Korean pine, scales spruce, fir, pine, fir, red one spruce, masson pine, fir, mongolica, basswood, paulownia, polishing the wood;Not easy to dry wood have cypress wood, color wood, maple wood, yellow pineapple, walnuts, camphor, catalpa wood, Chinese catalpa, elm katus, persimmon, liquidambar, etc;Difficult to dry wood are larch, manchurian ash, beech, cyclobalanopsis, German oak, lotus, cocobolo wood, oak, oak, etc.
(source:http://www.xinandry.com/en/news/wood-drying-97_266.html)
Wood drying, the dry the better?
Fresh wood contains a lot of water, in a specific environment, the water will continue to evaporate. The natural evaporation of moisture will lead to the emergence of dry shrinkage, cracking, bending deformation, mildew and other defects, affect the quality of wood products, therefore, lumber is made from wood for (control) before drying process.This is a reasonable use of wood, make lumber value-added important technical measures, is an indispensable first wood products production process.But not to say that the timber as dry as possible?A lot of people in the know on this point.Experts made the following analysis: wood under certain circumstances, after a period of time, its moisture content will tend to be a balance value, referred to as the equilibrium moisture content of the environment.When a piece of lumber moisture content is higher than the environment balance moisture content, the wood will platoon is wet contraction, vice of hygroscopic and expansion of will.In the Beijing area, for example, equilibrium moisture content of 11.4%, guangzhou equilibrium moisture content of 15.1%, if put the dry to 11% of the wood in Beijing is appropriate, but put the wood in guangzhou will be hygroscopic expansion, deformation.So, according to local conditions appropriate processing of wood drying, not as dry as possible.
(source:http://www.xinandry.com/en/news/wood-drying_265.html)
The purpose of wood drying
China's wood resource utilization is not high, and the waste wood, mostly due to wet unseasoned wood, or improper handling, resulting in lower wood, etc. even lost value. Fresh wood contains a lot of water, constantly evaporating water branch in a particular environment. Natural evaporation of moisture will cause the wood will shrink, cracking, bending, mildew and other defects seriously affect the quality of wood products, and therefore made of various types of wood before woodwork must be forced (under control) drying. Use appropriate wood drying machine can overcome these deficiencies (1) Preventing the deformation of wood cracking; (2)Improve the mechanical strength of the timber, improve the physical properties; (3) To prevent wood rot infestation; (4) Reduce the weight of the wood. Wood drying machine is the rational use of wood, so the important technical measure wood value-added wood products is also indispensable primary equipment. So in terms of product quality or from the point of view of economic efficiency, the use of a dryer for wood drying operations are one of the key aspects of wood products pivotal.
(source:www.xinandry.com/en/news/the-purpose-of-wood-drying_245.html)