CN104552518A - Dehumidification process of redwood - Google Patents
Dehumidification process of redwood Download PDFInfo
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- CN104552518A CN104552518A CN201510011736.3A CN201510011736A CN104552518A CN 104552518 A CN104552518 A CN 104552518A CN 201510011736 A CN201510011736 A CN 201510011736A CN 104552518 A CN104552518 A CN 104552518A
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- dehumidification
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K1/00—Damping wood
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/34—Organic impregnating agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/04—Combined bleaching or impregnating and drying of wood
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Pretreatment Of Seeds And Plants (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
The invention provides a dehumidification process of redwood and belongs to the field of wood. The dehumidification process comprises the steps of pressurization and soaking, centrifugation, steam convection and the like. According to the dehumidification process of the redwood, acetone liquid as a dehydrating agent is forced to enter the redwood in a pressurization way, thereby adsorbing part of water in the redwood, achieving the purpose of preliminary drying and relieving the subsequent dehumidification burden. A centrifugation method is used for dehumidification of the redwood, and the water in the redwood is transferred to two ends through axial xylem, thereby reducing the resistance in movement of the water and realizing complete evaporation. By adopting the process, the transfer direction of the water in the redwood is ingeniously changed, the dehumidification work becomes simple, and the dehumidification effect is good. The problems of poor dehumidification effect, great dehumidification difficulty and the like of an existing dehumidification process are solved.
Description
Technical field
The invention belongs to timber field, relate to a kind of dehumidification process of redwood.
Background technology
Redwood, the general designation of high-end, the famous and precious furniture woods of China, the hardwood of refer initially to redness, kind is more; After last century the eighties, everybody is to the increase in demand of mahogany furniture, and industry is urgently to be speculated, and country has carried out specification according to indexs such as density to redwood, redwood specification is: two sections, five genus, eight classes, 33 kinds.Redwood because poor growth, material are hard, growth period is all more than the centuries, originate in a lot of redwood of south China, Zao Ming, clear period just by remaining little of cutting down, redwood of today, be originate in Southeast Asia, Africa mostly, China Guangdong, Yunnan have cultivates cultivation and introducing and planting.The difference of timber heart sapwood is obvious, and sapwood is narrow, canescence; The yellowish redness of heartwood, to redness of the skin or complexion, becomes aubergine when being exposed in air for a long time, and certain Huanghua Pear, Burma spend the color of the timber such as pears, Door frame to take on a red color.Wood figure is attractive in appearance, and material is hard, durable, for valuable furniture and workmanship etc. use material.Redwood is that torrid areas pulse family wingceltis belongs to timber, and mainly originate in India, China Guangdong, Yunnan and the South Sea Islands are also produced, and is common famous and precious hardwood." redwood " is Jiangsu and Zhejiang Provinces and northern popular title, and Guangdong one band is commonly called as " sour branch wood ".
And to the general flow of mahogany furniture processing be at present: to select materials, drying and processing, mortise, engraving, assembling, scraped finish, japanning.Wherein, drying and processing is the drying steps of redwood, the drying means had now adopts the method for steam convection current usually, change wet-bulb temperature and dry-bulb temperature realize drying, but the wood density of this kind of kind is larger, adopt the method for steam convection current, steam is difficult to when insufficient pressure the inside entering into redwood, need constant pressurization, drying cost is high and technology difficulty is large, redwood is made to be difficult to drying, steam convection current method traditional in addition according to the method for moisture gradient, the Free water of wood internal and adsorbed water is externally moved gradually, then evaporate, period, the direction of moisture movement is moving radially along timber, need the xylem crossing over different gradient, leap difficulty is large, need to overcome larger resistance, the reason of the mode drying of wood poor effect of employing steam convection current at present that Here it is.
Summary of the invention
The problems such as the object of the invention is for the above-mentioned problems in the prior art, provide a kind of dehumidification process of redwood, the dehumidification process of this redwood makes redwood effect on moisture extraction good, and dehumidifying completely, solves existing dehumidification process effect on moisture extraction poor, and dehumidifying difficulty is large.
Object of the present invention realizes by following technical proposal: a kind of dehumidification process of redwood, comprises the steps:
A, supercharging are soaked, the acetone liquid that concentration is 100% is added in infusion chamber, redwood through screening is dipped in acetone liquid completely, sealing infusion chamber, carrying out all directions supercharging by supercharging equipment to acetone liquid forces acetone liquid to enter redwood inside, increase to pressure to 140-150mpa, the duration is 15-16 hour;
Acetone is industrially used for explosive, plastics, rubber, fiber, process hides, grease mainly as solvent, in the industry such as to spray paint, acetone industrially has the purposes being used as dehydrating agent, inventor is through attempting many times, drawn by great many of experiments, under suitable pressure, acetone liquid " can get into " inside entering redwood, absorbs the Free water in redwood and partial adsorbates water, reach the object of preliminarily dried redwood, follow-up dehumidifying work load is alleviated.
B, centrifugal, be placed on centrifuge by the redwood after soaking and carry out high-speed constant-speed centrifugal rotation, the center of redwood is fixing on centrifuge, and rotary speed is 8000-9800r/min, and time controling is at 7-8 hour;
Every root is fixing in centrifuges through the redwood center of soaking, by centrifugal process, rotation processing is carried out to redwood, adsorbed water in Free water residual in redwood and capillary is moved to the two ends of redwood, period, pass through centrifugal rotation, " hydrogen is strong to be combined " that can rupture in capillary, make adsorbed water occur " breaing up phenomenon ", easily remove in subsequent steps.
C, steam convection current, redwood after centrifugal is fixed, existing steam convection current method is adopted to carry out drying, steam convection current method comprises preheating, temperature is made to be 40-50 degree and humidity to be the humid air cycle of 0.07kg/m3-0.08 kg/m3 to flow through redwood, time is 60-70min, and vapor (steam) velocity controls at 2-3m/s, the reducing temperature and humidity stage, temperature is made to be 30-40 degree and humidity to be the humid air cycle of 0.04kg/m3-0.06kg/m3 to flow through above-mentioned redwood, time is 50-60min, the intensification wet down stage, temperature is made to be 60-70 degree and humidity to be the humid air cycle of 0.002kg/m3-0.004kg/m3 to flow through above-mentioned redwood, until water content is 10-11% in redwood, wherein, steam along redwood radial through, be 5-6mpa at the steam pressure at the two ends place of redwood, the steam of this pressure and redwood two ends contact length are the distance accounting for the 10%-15% of this redwood overall length from the port of redwood two ends.
Steam convection current method in this step is existing conventional redwood drying process, different places is, steam has the pressure of 5-6mpa at the two ends place of redwood, due in the centrifugation step of previous step, moisture major part in redwood has been transferred to the two ends place of redwood, by accelerating the drying to redwood two ends to the mode of steam boosting, moisture in redwood is gone out from two ends evaporation, traditional technique to make in redwood moisture shift from inside to outside according to the height of moisture gradient by steam convection current method thus evaporates, but this process moisture needs the xylem overcoming radial different gradient, resistance is larger, portion of water is difficult to discharge, this method makes moisture shift in the xylem of redwood axis, get rid of after being transferred to end, two ends, resistance is little, moisture evaporation completely, effect on moisture extraction is good.
In the dehumidification process of above-mentioned a kind of redwood, in step a, described boost pressure with the growth rate uniform-pressurizing of 2-3mpa/h to 140-150mpa.
By uniform-pressurizing, acetone is progressively infiltrated in redwood, osmotic effect is good.
In the dehumidification process of above-mentioned a kind of redwood, step c carries out in dry kiln.
In the dehumidification process of above-mentioned a kind of redwood, described supercharging equipment is booster pump.
In the dehumidification process of above-mentioned a kind of redwood, described infusion chamber is square, and the quantity of booster pump is four, respectively the four direction of corresponding infusion chamber.
In actual production, depending on physical device situation.
In the dehumidification process of above-mentioned a kind of redwood, between step b and step a, also there is step a1, remove acetone, 56-57 degree is warming up to the redwood through soaking, leave standstill 5-10 minute.
Although acetone has volatile characteristic, still remain the acetone liquid of fraction in the redwood after soaking, the boiling point of acetone is 56.53 degree, reaches the boiling point of acetone by heating, and makes the acetone volatilization remained.
Compared with prior art, the dehumidification process of this redwood has the following advantages:
1, the dehumidification process of this redwood is by the mode of supercharging, forces the acetone liquid as dehydrating agent to enter in redwood, and the portion of water in absorption redwood, reaches the object of preliminarily dried, and follow-up dehumidifying burden is alleviated.
2, the dehumidification process of this redwood is by the dehumidifying of centrifugal process for redwood, the moisture in redwood is transferred to two ends by axial xylem, moisture moving resistance is reduced, and evaporation completely.
3, the dehumidification process of this redwood makes by the steam of pressurized treatments the moisture rapid evaporation being positioned at redwood two ends to redwood two ends place, and efficiency is high, and evaporation completely.
4, the dehumidification process of this redwood adopts acetone as dehydrating agent, and acetone is colourless liquid, and prevent to redwood dyeing in immersion process, acetone has volatile characteristic simultaneously, and after soaking, most of acetone directly volatilizees, and decreases follow-up workload.
Detailed description of the invention
The dehumidification process of this redwood, comprises the steps:
A, supercharging are soaked, the acetone liquid that concentration is 100% is added in infusion chamber, redwood through screening is dipped in acetone liquid completely, sealing infusion chamber, carrying out all directions supercharging by supercharging equipment to acetone liquid forces acetone liquid to enter redwood inside, increase to pressure to 140-150mpa, the duration is 15-16 hour; Acetone is industrially used for explosive, plastics, rubber, fiber, process hides, grease mainly as solvent, in the industry such as to spray paint, acetone industrially has the purposes being used as dehydrating agent, inventor is through attempting many times, drawn by great many of experiments, under suitable pressure, acetone liquid " can get into " inside entering redwood, absorbs the Free water in redwood and partial adsorbates water, reach the object of preliminarily dried redwood, follow-up dehumidifying work load is alleviated.Supercharging equipment is booster pump.
In step a, boost pressure with the growth rate uniform-pressurizing of 2-3mpa/h to 140-150mpa.By uniform-pressurizing, acetone is progressively infiltrated in redwood, osmotic effect is good.
B, centrifugal, be placed on centrifuge by the redwood after soaking and carry out high-speed constant-speed centrifugal rotation, the center of redwood is fixing on centrifuge, and rotary speed is 8000-9800r/min, and time controling is at 7-8 hour; Every root is fixing in centrifuges through the redwood center of soaking, by centrifugal process, rotation processing is carried out to redwood, adsorbed water in Free water residual in redwood and capillary is moved to the two ends of redwood, period, pass through centrifugal rotation, " hydrogen is strong to be combined " that can rupture in capillary, make adsorbed water occur " breaing up phenomenon ", easily remove in subsequent steps.
C, steam convection current, redwood after centrifugal is fixed, existing steam convection current method is adopted to carry out drying, steam convection current method comprises preheating, temperature is made to be 40-50 degree and humidity to be the humid air cycle of 0.07kg/m3-0.08 kg/m3 to flow through redwood, time is 60-70min, and vapor (steam) velocity controls at 2-3m/s, the reducing temperature and humidity stage, temperature is made to be 30-40 degree and humidity to be the humid air cycle of 0.04kg/m3-0.06kg/m3 to flow through above-mentioned redwood, time is 50-60min, the intensification wet down stage, temperature is made to be 60-70 degree and humidity to be the humid air cycle of 0.002kg/m3-0.004kg/m3 to flow through above-mentioned redwood, until water content is 10-11% in redwood, wherein, steam along redwood radial through, be 5-6mpa at the steam pressure at the two ends place of redwood, the steam of this pressure and redwood two ends contact length are the distance accounting for the 10%-15% of this redwood overall length from the port of redwood two ends.Steam convection current method in this step is existing conventional redwood drying process, different places is, steam has the pressure of 5-6mpa at the two ends place of redwood, due in the centrifugation step of previous step, moisture major part in redwood has been transferred to the two ends place of redwood, by accelerating the drying to redwood two ends to the mode of steam boosting, moisture in redwood is gone out from two ends evaporation, traditional technique to make in redwood moisture shift from inside to outside according to the height of moisture gradient by steam convection current method thus evaporates, but this process moisture needs the xylem overcoming radial different gradient, resistance is larger, portion of water is difficult to discharge, this method makes moisture shift in the xylem of redwood axis, get rid of after being transferred to end, two ends, resistance is little, moisture evaporation completely, effect on moisture extraction is good.Step c carries out in dry kiln, and every root redwood is all fixed in dry kiln.
Infusion chamber is square, and the quantity of booster pump is four, respectively the four direction of corresponding infusion chamber.In actual production, depending on physical device situation.
Also there is step a1 between step b and step a, remove acetone, 56-57 degree is warming up to the redwood through soaking, leave standstill 5-10 minute.Although acetone has volatile characteristic, still remain the acetone liquid of fraction in the redwood after soaking, the boiling point of acetone is 56.53 degree, reaches the boiling point of acetone by heating, and makes the acetone volatilization remained.
Below for adopting the redwood dehumidifying concrete condition contrast of traditional redwood dehumidification process and this technique of employing:
Raw material all adopts 30 thickness through predrying (natural drying) to be 30mm length to be the Burma of 20cm to spend pears.
Traditional handicraft directly adopts steam convection current method, and make temperature be 50 degree and humidity to be the humid air cycle of 0.07kg/m3 to flow through raw material, the time is 60min, and vapor (steam) velocity controls at 2m/s; In the reducing temperature and humidity stage, make temperature be 40 degree and humidity to be the humid air cycle of 0.06kg/m3 to flow through raw material, the time is 60min, the intensification wet down stage, makes temperature be 70 degree and humidity to be the humid air cycle of 0.004kg/m3 to flow through raw material.
After work in 35.4 hours, detected by L606/L-606 Wood moisture tester, moisture content in raw material does not change substantially, last 30 Burma spend the testing result of pears to be: wherein, 18 moisture content are 13%-13.5%, 10 moisture content are 11%-11.6%, also have 2 moisture content about 14%.
Below for adopting the result after this technique:
A, supercharging are soaked, the acetone liquid that concentration is 100% is added in infusion chamber, pears Burma are spent to be dipped to completely in acetone liquid, sealing infusion chamber, carry out all directions supercharging by supercharging equipment to acetone liquid to force acetone liquid to enter Burma to spend pears inner, increase to pressure to 140mpa, the duration is 15 hours, boost pressure with the growth rate uniform-pressurizing of 2mpa/h to 140mpa.
A1, removes acetone, spends pears to be warming up to 57 degree to the Burma through soaking, and leaves standstill 10 minutes.
B, centrifugal, spend pears to be placed on centrifuge the Burma after soaking and carry out high-speed constant-speed centrifugal rotation, Burma spends the center of pears fixing on centrifuge, and rotary speed is 9000r/min, and time controling was at 8 hours;
C, steam convection current, spend pears to fix the Burma after centrifugal, adopts existing steam convection current method to carry out drying; steam convection current method comprises preheating; make temperature be 50 degree and humidity to be the humid air cycle of 0.07kg/m3 to flow through Burma and spend pears, the time is 60min, and vapor (steam) velocity controls at 2m/s; The reducing temperature and humidity stage, make temperature be 40 degree and humidity to be the humid air cycle of 0.06kg/m3 to flow through Burma and spend pears, time is 60min, the intensification wet down stage, make temperature be 70 degree and humidity to be the humid air cycle of 0.004kg/m3 to flow through Burma and spend pears, wherein, steam along Burma spend pears radial through, spend the steam pressure at the two ends place of pears to be 6mpa in Burma, the steam of this pressure and Burma spend pears two ends contact length be account for from Burma spends pears two ends port this Burma Hua Li overall length 15% distance.
After work in 30 hours, detected by L606/L-606 Wood moisture tester, Burma spends the moisture content in pears substantially not change, last 30 Burma spend the testing result of pears to be: 25 Burma spend the water content of pears to be 11%-11.4%, 3 Burma spend the water content of pears to be 13.3%-13.5%, and 2 Burma spend the water content of pears to be 14%-14.4%.
This experiment needs Burma to be spent the moisture control of pears below 12%, from the good and bad situation drawing traditional handicraft and the innovation technique that above data can be very clear and definite, because Burma spends pears quality hard, density is high, and traditional handicraft is difficult to dehumidifying, and effect on moisture extraction is poor, found by data, the dehumidification process effect on moisture extraction of this redwood is good, and Burma spends the water content of pears can reach the standard manufacturing furniture easily, and from its operating efficiency of working time higher than the efficiency adopting traditional handicraft.
As for other kinds of redwood, do not enumerate at this.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Claims (6)
1. a dehumidification process for redwood, comprises the steps:
A, supercharging are soaked, the acetone liquid that concentration is 100% is added in infusion chamber, redwood through screening is dipped in acetone liquid completely, sealing infusion chamber, carrying out all directions supercharging by supercharging equipment to acetone liquid forces acetone liquid to enter redwood inside, increase to pressure to 140-150mpa, the duration is 15-16 hour;
B, centrifugal, be placed on centrifuge by the redwood after soaking and carry out high-speed constant-speed centrifugal rotation, the center of redwood is fixing on centrifuge, and rotary speed is 8000-9800r/min, and time controling is at 7-8 hour;
C, steam convection current, redwood after centrifugal is fixed, existing steam convection current method is adopted to carry out drying, steam convection current method comprises preheating, temperature is made to be 40-50 degree and humidity to be the humid air cycle of 0.07kg/m3-0.08 kg/m3 to flow through redwood, time is 60-70min, and vapor (steam) velocity controls at 2-3m/s, the reducing temperature and humidity stage, temperature is made to be 30-40 degree and humidity to be the humid air cycle of 0.04kg/m3-0.06kg/m3 to flow through above-mentioned redwood, time is 50-60min, the intensification wet down stage, temperature is made to be 60-70 degree and humidity to be the humid air cycle of 0.002kg/m3-0.004kg/m3 to flow through above-mentioned redwood, until water content is 10-11% in redwood, wherein, steam along redwood radial through, be 5-6mpa at the steam pressure at the two ends place of redwood, the steam of this pressure and redwood two ends contact length are the distance accounting for the 10%-15% of this redwood overall length from the port of redwood two ends.
2. the dehumidification process of a kind of redwood according to claim 1, is characterized in that, in step a, described boost pressure with the growth rate uniform-pressurizing of 2-3mpa/h to 140-150mpa.
3. the dehumidification process of a kind of redwood according to claim 1 and 2, is characterized in that, step c carries out in dry kiln.
4. the dehumidification process of a kind of redwood according to claim 1 and 2, is characterized in that, described supercharging equipment is booster pump.
5. the dehumidification process of a kind of redwood according to claim 4, is characterized in that, described infusion chamber is square, and the quantity of booster pump is four, respectively the four direction of corresponding infusion chamber.
6. the dehumidification process of a kind of redwood according to claim 1 and 2, is characterized in that also having step a1 between step b and step a, removes acetone, is warming up to 56-57 degree to the redwood through soaking, and leaves standstill 5-10 minute.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107379169A (en) * | 2017-08-28 | 2017-11-24 | 阜南县腾祥工艺品有限公司 | A kind of drying means for reducing poplar season cracking rate |
| CN107471366A (en) * | 2017-10-01 | 2017-12-15 | 莆田市荔城区聚慧科技咨询有限公司 | A kind of redwood dehumidification process based on suppression cytoactive |
| CN107520926A (en) * | 2017-10-01 | 2017-12-29 | 莆田市荔城区聚慧科技咨询有限公司 | A kind of drying means of redwood |
| CN107521129A (en) * | 2017-09-29 | 2017-12-29 | 安徽德全新型建材科技有限公司 | One kind accelerates styrofoam aging method |
| CN114701029A (en) * | 2022-04-18 | 2022-07-05 | 中山市伍氏大观园家具有限公司 | Pretreatment process of rosewood |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107379169A (en) * | 2017-08-28 | 2017-11-24 | 阜南县腾祥工艺品有限公司 | A kind of drying means for reducing poplar season cracking rate |
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| CN107471366A (en) * | 2017-10-01 | 2017-12-15 | 莆田市荔城区聚慧科技咨询有限公司 | A kind of redwood dehumidification process based on suppression cytoactive |
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| CN114701029A (en) * | 2022-04-18 | 2022-07-05 | 中山市伍氏大观园家具有限公司 | Pretreatment process of rosewood |
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| CN104552518B (en) | 2016-08-24 |
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