Jiangsu XINAN Drying Equipment Co., Ltd @xinanry - Tumblr Blog

Drying machine of pollution to the environment

Our country existing various kinds of drying machine, steam drying accounted for more than 80%.While the furnace gas and direct fire smoke dry more in small businesses.Dry steam in the boiler for heating equipment, the average thermal efficiency of industrial boiler and its network in China is 60%, at the same time, dry steam inlet and exhaust heat loss is larger, accounts for about 40% of the steam heat, heat losses and wall doors, so that the steam drying of an energy efficiency generally lower than 30%.Dry high energy consumption, not only increase the cost of products, and make the boiler smoke and exhaust fumes and drying chamber increase, thereby increasing the these harmful material of atmospheric pollution.With years of the steam drying capacity of 10000 cubic meters of wood drying workshop, for example, takes about a match 4 t/h boiler, its discharge of harmful substances as per hour: smoke quantity about 40 kg, CO2:1900 cubic meters and SO2:45 cubic meters, and a small amount of NO2, which is caused by the atmospheric greenhouse effect, acid rain and ozone destruction of the main factors.According to the relevant information, in the global monitoring online, in 40 particles to the sorting of the most polluted cities, shenyang, xian, Beijing, Shanghai and guangzhou in the top 10.Due to the contribution of energy to link up to 70% ~ 80%, so the energy-saving problem of wood drying must attach importance to it.Hangzhou much is aimed at the problem of high energy consumption of the drying, design and manufacture the MCH series hot air circulation timber drying machine, its the biggest characteristic is: waste heat recycling type high efficiency and energy saving rapid drying, the hot air circulation wood dryer is the existing chamber (box) discharge to don't waste heat as heat source in the air, using heat coil heat absorption of heat in the air, and make the air more and more dry, with heat and dry air is the cooling coil pipe reheating, higher and higher temperature, reach the set temperature, bypass solenoid valve let urself by-pass pipe refrigerant, heat absorption of the hot air source heat pump assembly;Because for thermal insulation heat preservation box adopts thermal insulation, heat losses is slow, so the vast majority of can stay in the material used for drying oven heat preservation, heat, can implement high efficiency and energy saving in environmental protection at the same time.

(source:http://www.xinandry.com/en/news/drying-machine_280.html)

#Drying machine

The effect of wood drying equipment

With the development of social economy, the progress of human civilization and improvement of residents' living standards, the quality and quantity of wood and its products put forward higher requirements, for wood processing technology, including control technology of the crowd is higher and higher demands are proposed.Defects such as cracking, bending deformation, mildew, seriously affecting the quality of wood products, so the wood before made all kinds of wood products for dry processing (control).Wood drying equipment configuration dehumidifier using dissipation moisture from the wood, use artificial method to force wood moisture evaporation, dissipation make the moisture content of timber fell and the level of the local equilibrium moisture content, avoid wood mildew or in the process of storage, transportation and use of hyphal erosion and wood splitting, deformation.The wood drying equipment is the device can effectively remove the moisture from the wood.

Wood in certain circumstances, after long enough, its moisture content will tend to be a balance value, known as the environmental balance moisture content of EMC.When equilibrium moisture content of lumber moisture content is higher than that of environment, the wood will platoon is wet contraction, vice of hygroscopic and expansion of will.Guangzhou region, for example, the balance of the annual average moisture content of 15.1%, in the Beijing area is 11.4%.Dry to 11% of the wood used in Beijing is appropriate, can be used in guangzhou will be hygroscopic expansion, deformation.So, wood drying, not as dry as possible.Different regions, different USES, demand for lumber moisture content is also different.

(source:http://www.xinandry.com/en/news/wood-drying-equipment-58_279.html)

#wood drying equipment

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)

#wood drying

Wood drying machine main principle

In wood drying machine normal operation, the fuel in the combustion chamber full burning, generate heat, heat drying system in fully absorbed by the drying medium, to produce the temperature of 170 degrees Celsius, the circulation fan, under the action of high temperature air flow through the control system, transmission system, the high temperature hot air to dry indoor to dry the wood;At the same time the steam generating device on the equipment, can produce a large number of atmospheric steam, according to the requirements of the drying process, timely to steam into the drying chamber, to steam injection, wet processing of wood, damping system is an independent steam system, and equipped with a safety device.Wood drying machine is first and foremost make 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.Wood drying machine and the influence of tree species the effect of the drying effect is very big also

(source:http://www.xinandry.com/en/news/wood-drying-machine-64_276.html)

#Wood drying machine

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)

#wood drying

Position selection of humidity meter in wood drying kiln

Moisture meter in wood drying kiln location must be able to truly reflect the actual status of indoor air medium (temperature, humidity), which can reflect the average status of indoor air, generally choose the material pile side into the wind and the position of representative.If dry indoor air circulation is reversible, the pile wood moisture meter shall be installed on both sides, so that any time can stack into the wind with the village side of temperature and humidity as the basis of executing drying.If using glass tube liquid thermometer hygrometer, hygrometer window high position should guarantee the operator head-up observation shall prevail;If the thermal resistance thermometer or thermocouple thermometer hygrometer, should be separately installed on both sides of material heap two identical hygrometer, height direction in high l / 2, position, in the middle of a drying chamber length direction.Two hygrometer can be switch rotation measurement, make the hygrometer on one side of the wood pile into work, to measure material pile of one side of the air inlets, medium state (temperature, humidity).Due to the drying chamber has laid the captain axis, short axis wind machine, lateral ventilation type, side wind machine, hot air type and a variety of types such as jet type, and each type of drying chamber fan, heater installation also varied, therefore, the moisture meter location choice also can't be the same, each enterprise according to the characteristics of their respective drying chamber structure, based on the above basic principles, carries on the reasonable choice.

(source:http://www.xinandry.com/en/news/wood-drying-kiln-38_273.html)

#wood drying kiln

Wood drying kiln hygrometer position reasonable choice

Moisture meter in wood drying kiln location must be able to truly reflect the actual status of indoor air medium (temperature, humidity), which can reflect the average status of indoor air, generally choose the material pile side into the wind and the position of representative.If dry indoor air circulation is reversible, the pile wood moisture meter shall be installed on both sides, so that any time can stack into the wind with the village side of temperature and humidity as the basis of executing drying.If using glass tube liquid thermometer hygrometer, hygrometer window high position should guarantee the operator head-up observation shall prevail;If the thermal resistance thermometer or thermocouple thermometer hygrometer, should be separately installed on both sides of material heap two identical hygrometer, height direction in high l/2, position, in the middle of a drying chamber length direction.Two hygrometer can be switch rotation measurement, make the hygrometer on one side of the wood pile into work, to measure material pile of one side of the air inlets, medium state (temperature, humidity).Due to the drying chamber has laid the captain axis, short axis wind machine, lateral ventilation type, side wind machine, hot air type and a variety of types such as jet type, and each type of drying chamber fan, heater installation also varied, therefore, the moisture meter location choice also can't be the same, each enterprise according to the characteristics of their respective drying chamber structure, based on the above basic principles, carries on the reasonable choice.

(source:http://www.xinandry.com/en/news/wood-drying-kiln-95_271.html)

#Wood drying kiln

New type of integrated solar wood drying kiln

An inexhaustible inexhaustible solar energy, and on the environment pollution-free, so the use of solar energy in wood drying on energy saving has important significance to protect the environment.But solar energy flow density is low, and are affected by the weather, solar wood drying is very difficult to run continuously, at the same time, application of collector collection efficiency is generally low.In order to improve the efficiency of solar energy utilization, better use of solar energy in wood drying, we study of new type of solar drying technology.This article first to introduce new solar wood drying kiln, equipped with the integral solar drying chamber heat pipe and paraffin thermal storage application the collection of automation control equipment on the intensity of solar radiation, temperature and humidity and fan automatic data collection and control.Then experimental research method was applied to the performance of the new type of solar drying system and wood drying technology is systematically analyzed and studied.Fair day drying room temperature can reach 45℃ or so, about average temperature at 30℃, the highest temperature can reach 50 to 60℃;In sunny weather, paraffin regenerative make drying chamber average temperature at 30℃ or so in the night, higher than the environment temperature of 4-5℃;Heat pipe and integral collector heat utilization efficiency were 64%, 33% respectively;Drying chamber and energy saving efficiency is 70.9%.At last, by experimental study on the method of the timber surface and internal temperature gradient, the drying rate, drying quality of research and analysis, develop and optimize the drying process.Timber surface and internal temperature gradient is cyclical change, in the morning dry indoor temperature, internal temperature is lower than the surface temperature;At the temperature of drying chamber is reduced, wood surface temperature is less than the internal temperature.In the heating stage, the internal temperature is higher than the surface temperature;In solar wood drying rate faster, compared to air dry, solar drying same batch cypress wood plank from the initial moisture content moisture content of 64.7% to 64.7% used time less than 11 days, atmospheric dry moisture content from the initial moisture content of 75% to 29.5 less than 7 days used air drying time.Cypress wood plank of solar drying moisture content and stress test, results show that the drying quality can reach the grade lumber drying quality standards, no visible drying defects.

(source:http://www.xinandry.com/en/news/solar-wood-drying-kiln_270.html)

#wood drying kiln

Principle of thermal modification of wood

After thermal modification of wood not only beautiful, durable, environmental protection, also suitable for indoor and outdoor any wood use of building materials and decorative materials.Wood is composed of hemicellulose, cellulose, lignin and small amounts of the extract of composition.Hemicellulose heat-resisting performance is poorer, under the effect of high temperature, it first degradation, generate free acetic acid, and the release of acetic acid as a catalyst, and accelerated the hemicellulose hydrolysis into sugars.So after heating, wood hemicellulose content is significantly reduced, and with the degradation of hemicellulose, the hygroscopicity of hydroxy significantly reduced, thereby the hygroscopicity of lumber, dimension stability improved.In addition, the formation of free acetic acid, and significantly reduce decay fungi favorite food, and inhibit the growth of the decay fungi from the food chain.Cellulose is the crystalline region and amorphous area coexist long molecular chain structure.The size of the cellulose hygroscopicity, depends on the size and the amorphous free hydroxyl number.Wood heating, the formation of free acetic acid, and degradation of cellulose microfibril in the amorphous region, reduce amorphous area, make cellulose crystallinity and crystal size increases, this also reduces the moisture absorption of timber, increased dimensional stability.Wood contains a small amount of extract is low molecular substances, resin acid, terpenoids, fat, wax, tannin, phenols, etc.Wood heating, most extract volatile, also reduce decay fungi food, thus improve the corrosion resistance of the wood.In addition, resin compounds such as volatile, also improve the wood paint and bonding performance.

(source:http://www.xinandry.com/en/news/thermal-modification-of-wood_269.html)

#thermal modification of wood

Dry standard of Kiln dried wood

Kiln dried wood, refers to the special buildings or metal container artificial drying. Artificial wood drying is artificially controlled the drying medium temperature, humidity and air velocity, the main use of convection heat transfer of gas medium to dry the wood.

Dry kiln drying effect is mainly selected the appropriate benchmark table.Our country's benchmark two drying time and moisture content.Time benchmark more commonly used for wood drying under 40 mm thickness.Moisture content of the benchmark generally divided into two kinds of temperature rising and fluctuating, the most widely temperature rising type, can be used to dry various tree species and a variety of specifications, especially in 40 mm ~ 90 mm thick wood;Full wave benchmark less drying;Half wave type is mainly used for difficult dry tree species, large cross section of the timber, such as thickness of about 80 mm, 80 mm and 110 mm wood.Our country lumber drying has been listed in the forestry industry standards of the People's Republic of China (LY/T1068-92).The thickness of the lumber is 15, 25, 30, 40, 50, 60, 70, 80 mm.

(source:http://www.xinandry.com/en/news/kiln-dried-wood_268.html)

#Kiln dried wood

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)

#wood drying

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

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)

#Wood drying

Drying process of wood drying kiln

Drying process of wood drying kiln is divided into three stages, the first stage, the preheat treatment stage, the purpose is in before you make the wood drying heat through fully, and eliminate may already exist dry stress (produced in the process of air drying).Start the stove fan to the chamber in the heating, at the same time the light inside the boiler furnace chamber and wet (steam injection), temperature of 40 ℃ to 50 ℃, the temperature rises too fast, steam injection (wet), closed when moisture removal.To the chamber humidifying time depending on the wood species and thickness, generally 20 to 30 hours, about 1 to 2 days.Innovation circulation fan once every 4 hours in turning., the second stage, middle stage of processing center processing was conducted in the process of kiln dry wet processing, its purpose is to eliminate the early stage of the generated surface tensile stress, in order to prevent the crack, dry or eliminate middle and late of surface hardening, late to prevent the internal crack.Platoon is wet was conducted according to the running direction of the stove fan manual, when after the completion of the preheat humidification, stuffy kiln for 24 hours.Temperature is above 55 degrees can be wet, according to the fan to manually open or close the corresponding row of wet flap, platoon is wet time is fan once every 4 hours and the reversing, platoon is wet for 30 minutes.Temperature will gradually increased after the platoon is wet, but not more than 80 degrees.For easy to deformation or cracking of the wood, the platoon is wet and dry appropriate for a small amount of humidifying (steam injection), to eliminate the internal stress of lumber.Drying elm suggest humidifying 4 hours every 48 hours, humidification mouth closed when moisture removal.This operation need about 6 to 7 days.The third stage, the normal drying stage, after 9 days, the temperature of 65 ℃ to 75 ℃, it is forbidden to overtemperature, stop the humidifying (steam injection), reverse circulation fan every 4 hours, moisture removal for 1 hour.Until dry. Takes about 4 to 6 days.Four to eight hours after the treatment, braised kiln sampling inspection, qualified after slowly lower the temperature in the drying room, when the temperature dropped to 40 ℃, before the kiln.

(source:http://www.xinandry.com/en/news/wood-drying-kiln-72_262.html)

#wood drying kiln

Use of wood drying kiln

Wood drying kiln in the use of the process generally have the outer crack, internal crack, crack three cases. When stacking, material pile end of every article near the end pressure to align them up and down as far as possible;Seting, wood pile and the end of the wood pile close as far as possible, to prevent the air from the material of the gap between the short circuit, in order to avoid end dry too fast;On board end coating paraffin oil or thick paint, preventing water evaporation from the end;For the crack occurs easily hard broadleaf timber or thick plate, try to use soft drying technology, and pay attention to timely for wet processing, etc.

Common defects in wood drying solutions: (1) the crack (crack) : refers to the outer surface of the sawn timber (usually a string of cutting board section) on the longitudinal cracks occur along the wood ray, it is mainly due to the early stage of the drying surface tensile stress is too large, so the early stage of the drying should try to avoid heat up quickly, control the heating time gradient.(2) the internal crack (honeycombing) : wood inside crack occurred inside the wood, the wood rays burst, such as honeycomb, also called honeycombing.Inside crack, generally in the late dry, prevent way is in the middle of the kiln dried in a timely manner the middle and late processing, to remove surface hardening, for larger thickness of sawn timber, especially hard hard wood, late drying temperature must not be too high.(3) the crack (split or longitudinal crack) : when wood drying kiln, due to the wood end moisture evaporates quickly, especially when the larger the thickness of the wood, are prone to cracking.

(source:http://www.xinandry.com/en/news/use-of-wood-drying-kiln_261.html)

#wood drying kiln

Stacking of wood drying kiln

In the process of wood drying kiln stacking, the same kiln dried lumber should plant species and initial moisture content is almost the same, the same thickness and generally does not allow mixed.

In the process of wood drying kiln stacking, wood lies between bar generally according to the thickness of the wood drying, section size between 3-5 cm width, thickness between 4-6 cm, specification should be consistent, the length is equal to the wood pile width.At straight texture, no knots, impact toughness and strength of skin defects such as good tree species, such as Korean pine, spruce, manchurian ash, meranti dried wood.Crosser spacing: soft wood pile, generally for the thickness of 18 to 20 times, broadleaf timber pile is generally 10 to 12 times the thickness, according to the thickness of dried lumber flexible control.Every article should be aligned, up and down in a vertical line, can't stagger, otherwise the sawn timber easy to bending deformation.

In the process of wood drying kiln stacking, the longitudinal direction of the sawn timber and perpendicular to the direction of airflow crosser and air flow in the same direction, so that the material circulation flow smoothly through the pile of the horizontal airway.

In the process of wood drying kiln stacking, wood pile end of every article should clamp board, wood pile and the end of the wood pile close as far as possible, and as far as possible with the chamber wall alignment, in order to avoid end dry too fast, cause the crack.

In the process of wood drying kiln stacking, sawn timber should be single tile, close to each other, not double stacked together, pile material must be put into a regular hexahedron, not bad not oblique, if the length of the wood is not consistent, left the gap in pile as far as possible, keep the end flush.

In the process of wood drying kiln stacking, wood piles installed, necessary article at the top of the heap along every place heavy pressure, to prevent or mitigate lumber deformation, available section of 100 x 100 mm special reinforced concrete layering or waste wood pressure at the top.

In the process of wood drying kiln stacking, in a pile on both sides of the wood (not end side) should be about 50 cm distance from the wall of the vertical airway.

(source:http://www.xinandry.com/en/news/wood-drying-kiln-45_260.html)

#wood drying kiln

Characteristics of vacuum wood drying kiln

Compared with the conventional drying, vacuum wood drying kiln can be achieved under the condition of low temperature rapid drying of wood, and ensure the quality of wood drying, largely avoid the generation of wood shrinkage defects.Through expert analysis to explore the discovery, cypress, for example, above the fiber saturation point, vacuum drying rate for conventional dry 2.34 ~ 2.88 times;While in the FSP, is 2.90 ~ 4.14 times.

Vacuum condition is the movement of the internal moisture can speed up the wood, wood drying speed, but may be more to speed up the wood surface water evaporation, the wood moisture content and high vacuum degree of improper or absolute pressure, moisture content of timber reach to the gradient will significantly increase, which can cause internal stress of wood increases, resulting in the possibility of deformation and cracking will also increase, causing the expansion of wood drying defects, so to grasp is the core part of vacuum conditions.Practice proved wood intermission vacuum drying convection heating drying cycle compared with the conventional kiln dry process, was only about a third, and the investment cost and conventional kiln drying equipment investment, and high vacuum drying quality.Vacuum drying quality advantage is reflected in: some pith of oak wood, northeast China ash timber, with conventional drying is very difficult to guarantee quality, drying with intermittent vacuum drying method basically didn't produce the defects such as warping and cracking;Some kiln drying defects more difficult after dry wood vacuum drying method is used to dry, dry fall rate have significantly decreased.

(source:http://www.xinandry.com/en/news/vacuum-wood-drying-kiln_259.html)

#vacuum wood drying kiln

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