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Before the appearance of veneer dryers, traditional wood drying was very difficult, and the quality was difficult to control. Generally, there will be several problems during the drying process.
1. Traditional vacuum drying: the drying cycle is short, the drying quality is good, but the energy consumption is high, the volume of the container is small, the control of the drying equipment and the drying process is relatively complicated, and it is suitable for hard broad-leaf thick plates or Wood that is prone to shrinkage.
2. Microwave and high-frequency wood drying: the disadvantage is that electricity is used as the energy source, the cost is high, and the equipment performance is not perfect.
3. Natural drying occupies a large area, and the drying cycle is long, up to 15-30 days, and is greatly affected by the climate. The quality of natural drying of veneers is relatively low, and the moisture content fluctuates greatly.
4. In the wood drying project, most of them are faced with the uncontrollable moisture content, the wood is prone to cracking, the drying is uneven, the material is prone to bending and deformation, and the drying quality is not guaranteed.
The veneer dryer has the characteristics of energy saving, high efficiency, simple operation and reliable performance. High-quality, efficient, environmentally friendly and energy-saving bamboo and wood microwave drying equipment for product drying, sterilization, extraction, vacuum drying, etc. Preventing mildew and killing insects is a new technology, widely used in wood, bamboo products, furniture, flooring and other industries Bamboo drying, because in conventional drying, a lot of waste is caused by deformation, cracking, mildew, etc.; it has fast drying speed, no deformation, no cracking, moth, and mildew, and the product quality is good, which is conducive to continuous drying. A series of advantages such as automated production.
Wood drying refers to the process of turning the water in the wood into steam and discharging the wood by relying on the energy provided by the outside world. Wood drying can be divided into two categories: natural drying and artificial drying.
Wet veneers are relatively heavy, relatively speaking, the transportation cost is relatively high, and the required storage space is relatively large. Wood contains a lot of water, which is not conducive to storage and transportation, etc., and needs to be dried. The veneer after drying will be lighter, reducing unnecessary freight and storage costs.
Wet veneers are prone to worms and wormholes, which reduce the quality of the veneer. Drying veneer is an essential process in plywood processing, which lays a solid foundation for the subsequent veneer processing process.
The key to improving the quality of the veneer is the moisture content of the wood during the drying process. The moisture content of the wood is determined by the average air humidity in the area. Only when the moisture content of the board is balanced with the outside air humidity can the stability of the product be guaranteed. Sex, so that it will not cause deformation and cracking, and the average moisture content of the air in different regions is different, which needs to be changed according to local actual regulations. The veneer dryer can efficiently and evenly dry the veneer to the standard moisture content.
Natural air drying does not require a lot of energy input and is an environmentally friendly drying method. However, because air drying cannot make the veneer meet the final moisture content standard of less than 12%, it takes a long time, occupies a large area, and the drying result is unstable. Factories with large output or high requirements on veneer quality usually choose artificial forced drying - veneer dryer.
The veneer dryer has the characteristics of large drying output, obvious energy saving effect, and low maintenance. The hot air can fully contact the material to complete the drying. It can be applied to specific materials and meet the basic requirements for material drying, including good Handle materials (feeding, conveying, fluidization, dispersion, heat transfer, discharge, etc.), and can meet the basic requirements of processing capacity, dehydration capacity, product quality, etc.
When the wood dryer is running normally, the fuel is fully burned in the combustion chamber to generate heat energy, and the drying medium in the heat energy drying system is fully absorbed to generate high temperature. The hot air is transported to the drying room to dry the wood, and the steam generating device on the equipment can generate a large amount of atmospheric pressure steam.
According to the requirements of the drying process, the steam can be sent into the drying room at the right time, and the wood can be sprayed and steamed and the humidity can be adjusted. The humidity adjustment system is an independent steam system and is equipped with a device. The water evaporates, the moisture content of the surface layer is lower than that of the wood interior, and the internal moisture moves to the surface layer under the action of the moisture content gradient. The hot and humid air evenly reduces the moisture content of the veneer to 8%-10% (adjust according to actual needs).
Cooling the veneer in the heating chamber is an advantageous means to prevent the veneer from returning to moisture due to seasonal and other climatic reasons. The factory can match the cooling room according to the production demand.
The drying equipment can be applied to specific materials and meet the basic requirements of material drying, including the ability to handle materials well, and can meet the basic requirements of processing capacity, dehydration capacity, product quality, etc., only for drying equipment In terms of drying rate, during convective drying, the material is highly dispersed in hot air, the critical moisture content is low, and the drying speed is fast, and the same is convective drying, and the critical moisture content is different in different drying methods, so the drying rate is also different.
The drying speed at the initial stage depends on the speed of water evaporation on the surface of the wood. In the middle and late stages of drying, the drying speed depends on the moving speed of the water inside the wood, which is inversely proportional to the thickness of the board and the specific gravity of the wood. In addition, the drying speed of the sapwood is faster than that of the heartwood. Fast, the chord panel of broad-leaved wood dries faster than the diameter panel; but the difference between the chord and diameter of coniferous wood is not obvious, and the drying effect of the wood dryer is also greatly affected by the tree species.
The wood dryer can use wood waste combustion as the heating source and drying as the part: roller/mesh belt feeding rack, closed heating chamber, cooling chamber, discharging rack and stacking place. Heating part: two layers of inner heating and outer insulation. The internal heating adopts a straight-through horizontal circulation veneer dryer, and its thermal cycle design draws on the advantages of advanced dryer technology, and adopts a side-mounted centrifugal fan. The new heat exchanger and the spray box with rectangular variable cross-section make the high-speed jet flow acting on the surface of the veneer uniform. The hot air blowers in the heating chamber of the front and rear areas are arranged separately on the left and right, so as to ensure that the dried veneer obtains the same final moisture content at each point.
The wood dryer has large processing capacity, less fuel consumption, and low drying cost. The dryer has the characteristics of high temperature resistance, and can use high temperature hot air to quickly dry materials. The production margin should be considered in the design, even if the output increases slightly, there is no need to replace the equipment.
High-temperature qualitative treatment is a way to reduce internal cracks in wood. For wood with internal cracks, high-temperature and high-humidity treatment is performed before the drying process to eliminate residual deformation of the wood surface. During the treatment, the wood surface is humidified and expanded. The compression residual deformation is offset with the original stretch residual deformation to avoid internal cracking of the wood.
Cooling in the cooling room is the way to prevent moisture return and reduce wood cracking and deformation. Wood absorbs water after being damp, and water generally enters the cavity of the cell, and the cell wall begins to expand. Due to the different expansion rates and expansion degrees of various cells, the wood will produce different shape changes, deformation, cracking, warping, etc. result. When the wood product reaches the equilibrium moisture content when it is used, the wood at this time is not easy to crack and deform. After the veneer is cooled in the cooling chamber, it can prevent the phenomenon of returning to moisture due to seasons and other reasons.
The wood dryer is convenient for people to dry wood. The use of wood in the field of life is gradually increasing, and the use of wood in the construction field is gradually increasing. When using wood, the wood will be dried.
Heating medium | steam system/oil system |
Veneer thickness(mm) | >1.7 - 6 |
Veneer initial moisture content | 80% |
Veneer final moisture content | 10% |
Work layers | 4 |
Length of heating chamber(mm) | n×2000 |
Length of cooling chamber(mm) | m×2000 |
Drying capacity | 6 |
Steam consumption | 3800 kg / h |
1. Modular design, easy to install
Modular prefabricated construction with minimal on-site assembly. Bolt structure, welded structure are available.
2. Fine machining, long service life
1) Frame: high-quality special-shaped steel pipe truss and columns, with good rigidity, firm connection, simple structure and easy installation.
2) Roller bearings are high-quality high-purity electrochemical graphite bearings, which are wear-resistant and high-temperature resistant.
3) Graphite bearing: High-quality high-purity electrochemical graphite bearing, reliable material, reasonable formula, wear-resistant and high-temperature resistant, not easy to break and durable, and has a long service life.
4) Spray box: Variable cross-section shape, the hot air spray speed of each nozzle hole in the length direction is consistent, ensuring uniform final moisture content of the veneer.
5) Hot air blower: imported high-flow and high static pressure centrifugal fan, vertical structure, manganese steel impeller, non-ferrous metal fireproof friction ring, which can effectively avoid fire hazard inside the machine.
6) Thermal cycle system: Steel-aluminum composite rolled sheet heat pipe heater. The heat dissipation area per unit length of the heat pipe is large, and the thermal conductivity K=58 under the working wind speed. And the optimized structural design with low resistance ensures the technical characteristics of high efficiency and energy saving.
7) The heating chamber has strong airtightness and effective heat preservation. The insulated floor protects the foundation and prevents heat loss, efficient thermal energy.
The whole machine is made of high-quality cold-rolled thin steel plate, which is anti-rust and corrosion-resistant. The internal components of the equipment are all sprayed with red lead antirust primer or high temperature resistant silver powder paint, and the outer surface parts are sprayed with polyurethane wrinkle paint after installation.
3. Whole plant planning, installation guidance
Before the appearance of veneer dryers, traditional wood drying was very difficult, and the quality was difficult to control. Generally, there will be several problems during the drying process.
1. Traditional vacuum drying: the drying cycle is short, the drying quality is good, but the energy consumption is high, the volume of the container is small, the control of the drying equipment and the drying process is relatively complicated, and it is suitable for hard broad-leaf thick plates or Wood that is prone to shrinkage.
2. Microwave and high-frequency wood drying: the disadvantage is that electricity is used as the energy source, the cost is high, and the equipment performance is not perfect.
3. Natural drying occupies a large area, and the drying cycle is long, up to 15-30 days, and is greatly affected by the climate. The quality of natural drying of veneers is relatively low, and the moisture content fluctuates greatly.
4. In the wood drying project, most of them are faced with the uncontrollable moisture content, the wood is prone to cracking, the drying is uneven, the material is prone to bending and deformation, and the drying quality is not guaranteed.
The veneer dryer has the characteristics of energy saving, high efficiency, simple operation and reliable performance. High-quality, efficient, environmentally friendly and energy-saving bamboo and wood microwave drying equipment for product drying, sterilization, extraction, vacuum drying, etc. Preventing mildew and killing insects is a new technology, widely used in wood, bamboo products, furniture, flooring and other industries Bamboo drying, because in conventional drying, a lot of waste is caused by deformation, cracking, mildew, etc.; it has fast drying speed, no deformation, no cracking, moth, and mildew, and the product quality is good, which is conducive to continuous drying. A series of advantages such as automated production.
Wood drying refers to the process of turning the water in the wood into steam and discharging the wood by relying on the energy provided by the outside world. Wood drying can be divided into two categories: natural drying and artificial drying.
Wet veneers are relatively heavy, relatively speaking, the transportation cost is relatively high, and the required storage space is relatively large. Wood contains a lot of water, which is not conducive to storage and transportation, etc., and needs to be dried. The veneer after drying will be lighter, reducing unnecessary freight and storage costs.
Wet veneers are prone to worms and wormholes, which reduce the quality of the veneer. Drying veneer is an essential process in plywood processing, which lays a solid foundation for the subsequent veneer processing process.
The key to improving the quality of the veneer is the moisture content of the wood during the drying process. The moisture content of the wood is determined by the average air humidity in the area. Only when the moisture content of the board is balanced with the outside air humidity can the stability of the product be guaranteed. Sex, so that it will not cause deformation and cracking, and the average moisture content of the air in different regions is different, which needs to be changed according to local actual regulations. The veneer dryer can efficiently and evenly dry the veneer to the standard moisture content.
Natural air drying does not require a lot of energy input and is an environmentally friendly drying method. However, because air drying cannot make the veneer meet the final moisture content standard of less than 12%, it takes a long time, occupies a large area, and the drying result is unstable. Factories with large output or high requirements on veneer quality usually choose artificial forced drying - veneer dryer.
The veneer dryer has the characteristics of large drying output, obvious energy saving effect, and low maintenance. The hot air can fully contact the material to complete the drying. It can be applied to specific materials and meet the basic requirements for material drying, including good Handle materials (feeding, conveying, fluidization, dispersion, heat transfer, discharge, etc.), and can meet the basic requirements of processing capacity, dehydration capacity, product quality, etc.
When the wood dryer is running normally, the fuel is fully burned in the combustion chamber to generate heat energy, and the drying medium in the heat energy drying system is fully absorbed to generate high temperature. The hot air is transported to the drying room to dry the wood, and the steam generating device on the equipment can generate a large amount of atmospheric pressure steam.
According to the requirements of the drying process, the steam can be sent into the drying room at the right time, and the wood can be sprayed and steamed and the humidity can be adjusted. The humidity adjustment system is an independent steam system and is equipped with a device. The water evaporates, the moisture content of the surface layer is lower than that of the wood interior, and the internal moisture moves to the surface layer under the action of the moisture content gradient. The hot and humid air evenly reduces the moisture content of the veneer to 8%-10% (adjust according to actual needs).
Cooling the veneer in the heating chamber is an advantageous means to prevent the veneer from returning to moisture due to seasonal and other climatic reasons. The factory can match the cooling room according to the production demand.
The drying equipment can be applied to specific materials and meet the basic requirements of material drying, including the ability to handle materials well, and can meet the basic requirements of processing capacity, dehydration capacity, product quality, etc., only for drying equipment In terms of drying rate, during convective drying, the material is highly dispersed in hot air, the critical moisture content is low, and the drying speed is fast, and the same is convective drying, and the critical moisture content is different in different drying methods, so the drying rate is also different.
The drying speed at the initial stage depends on the speed of water evaporation on the surface of the wood. In the middle and late stages of drying, the drying speed depends on the moving speed of the water inside the wood, which is inversely proportional to the thickness of the board and the specific gravity of the wood. In addition, the drying speed of the sapwood is faster than that of the heartwood. Fast, the chord panel of broad-leaved wood dries faster than the diameter panel; but the difference between the chord and diameter of coniferous wood is not obvious, and the drying effect of the wood dryer is also greatly affected by the tree species.
The wood dryer can use wood waste combustion as the heating source and drying as the part: roller/mesh belt feeding rack, closed heating chamber, cooling chamber, discharging rack and stacking place. Heating part: two layers of inner heating and outer insulation. The internal heating adopts a straight-through horizontal circulation veneer dryer, and its thermal cycle design draws on the advantages of advanced dryer technology, and adopts a side-mounted centrifugal fan. The new heat exchanger and the spray box with rectangular variable cross-section make the high-speed jet flow acting on the surface of the veneer uniform. The hot air blowers in the heating chamber of the front and rear areas are arranged separately on the left and right, so as to ensure that the dried veneer obtains the same final moisture content at each point.
The wood dryer has large processing capacity, less fuel consumption, and low drying cost. The dryer has the characteristics of high temperature resistance, and can use high temperature hot air to quickly dry materials. The production margin should be considered in the design, even if the output increases slightly, there is no need to replace the equipment.
High-temperature qualitative treatment is a way to reduce internal cracks in wood. For wood with internal cracks, high-temperature and high-humidity treatment is performed before the drying process to eliminate residual deformation of the wood surface. During the treatment, the wood surface is humidified and expanded. The compression residual deformation is offset with the original stretch residual deformation to avoid internal cracking of the wood.
Cooling in the cooling room is the way to prevent moisture return and reduce wood cracking and deformation. Wood absorbs water after being damp, and water generally enters the cavity of the cell, and the cell wall begins to expand. Due to the different expansion rates and expansion degrees of various cells, the wood will produce different shape changes, deformation, cracking, warping, etc. result. When the wood product reaches the equilibrium moisture content when it is used, the wood at this time is not easy to crack and deform. After the veneer is cooled in the cooling chamber, it can prevent the phenomenon of returning to moisture due to seasons and other reasons.
The wood dryer is convenient for people to dry wood. The use of wood in the field of life is gradually increasing, and the use of wood in the construction field is gradually increasing. When using wood, the wood will be dried.
Heating medium | steam system/oil system |
Veneer thickness(mm) | >1.7 - 6 |
Veneer initial moisture content | 80% |
Veneer final moisture content | 10% |
Work layers | 4 |
Length of heating chamber(mm) | n×2000 |
Length of cooling chamber(mm) | m×2000 |
Drying capacity | 6 |
Steam consumption | 3800 kg / h |
1. Modular design, easy to install
Modular prefabricated construction with minimal on-site assembly. Bolt structure, welded structure are available.
2. Fine machining, long service life
1) Frame: high-quality special-shaped steel pipe truss and columns, with good rigidity, firm connection, simple structure and easy installation.
2) Roller bearings are high-quality high-purity electrochemical graphite bearings, which are wear-resistant and high-temperature resistant.
3) Graphite bearing: High-quality high-purity electrochemical graphite bearing, reliable material, reasonable formula, wear-resistant and high-temperature resistant, not easy to break and durable, and has a long service life.
4) Spray box: Variable cross-section shape, the hot air spray speed of each nozzle hole in the length direction is consistent, ensuring uniform final moisture content of the veneer.
5) Hot air blower: imported high-flow and high static pressure centrifugal fan, vertical structure, manganese steel impeller, non-ferrous metal fireproof friction ring, which can effectively avoid fire hazard inside the machine.
6) Thermal cycle system: Steel-aluminum composite rolled sheet heat pipe heater. The heat dissipation area per unit length of the heat pipe is large, and the thermal conductivity K=58 under the working wind speed. And the optimized structural design with low resistance ensures the technical characteristics of high efficiency and energy saving.
7) The heating chamber has strong airtightness and effective heat preservation. The insulated floor protects the foundation and prevents heat loss, efficient thermal energy.
The whole machine is made of high-quality cold-rolled thin steel plate, which is anti-rust and corrosion-resistant. The internal components of the equipment are all sprayed with red lead antirust primer or high temperature resistant silver powder paint, and the outer surface parts are sprayed with polyurethane wrinkle paint after installation.
3. Whole plant planning, installation guidance
