CN101623887A - Method for processing wood and wood manufactured by same - Google Patents
Method for processing wood and wood manufactured by same Download PDFInfo
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- CN101623887A CN101623887A CN200910090415A CN200910090415A CN101623887A CN 101623887 A CN101623887 A CN 101623887A CN 200910090415 A CN200910090415 A CN 200910090415A CN 200910090415 A CN200910090415 A CN 200910090415A CN 101623887 A CN101623887 A CN 101623887A
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Abstract
The invention relates to a method for processing wood, which belongs to the technical field of heat treatment of wood. The method comprises the steps of sequentially carrying out decompressing, preheating, high-temperature pressurizing and humidifying on wood placed into a container. Because the higher equilibrium water content is maintained in the process of processing the wood by the method, the manufactured wood overcomes the dry defects of cracking, shrinkage, and the like. The manufactured wood has reinforced size stability, strength and bending strength; the cracking generation proportion, the hygroscopicity and the water absorption performance of the wood are greatly reduced; and the weather and corrosion resistance of the wood is improved. The wood manufactured by the method reaches the standard of carbonized wood SB/T 10508-2008. The superheated steam with large specific heat and heat transfer coefficient is used as a heat transfer medium by the method and has small medium transfer resistance, short processing time and less heat loss; and the method saves energy sources and has low wood processing cost.
Description
Technical field
The present invention relates to a kind of processing method of timber and the timber that is prepared by this method, the particularly a kind of processing method of the temperature and pressure of water vapour in the timber surrounding space and timber of being handled by this method controlled belongs to technical field of heat treatment of wood.
Background technology
Existing studies show that, through the timber after the high-temperature heat treatment (heat treatment temperature is not less than 180 ℃), have a series of outstanding advantages such as good biodurable, weatherability, dimensional stability and safety, environmental protection, be applied to exterior decoration just increasingly extensively, the wood staircase, all many-sides such as park facility and sauna inner facility.
At present, known timber high-temperature processing method generally all is to carry out under normal pressure (0.1MPa).Yet, when timber carries out high-temperature heat treatment in the constant-pressure and high-temperature gas medium, its equilibrium moisture content is very low, because the timber top layer reached equilibrium moisture content in the heat treatment process before sandwich layer, can not keep higher equilibrium moisture content, cause on the timber cross section moisture gradient steeper, dry Wood Dimensional Stability difference and form seasoning defect drying defects such as cracking, shrinkage easily can not be guaranteed the dry mass of timber.In addition, in the constant-pressure and high-temperature heat treatment process, in order at high temperature to keep the state of high humidity, need constantly feed a large amount of saturated vapors, cause energy consumption higher, the rate of drying that the constant-pressure and high-temperature of timber is handled is slow, and drying time is long, the production cost height.
China all is in the constant-pressure and high-temperature gas medium timber to be handled relevant for timber high-temperature heat treatment technology, as: publication number is that the Chinese patent application of CN1876343A discloses a kind of " high temperature water heat processing method of timber ", and the concrete steps of this method are: 1) timber is placed the high-temperature heat treatment stove; Temperature in the high-temperature heat treatment stove is brought up to 120～150 ℃ of insulations; 2) after moisture content is reduced to below 5%, improve temperature to the 180 ℃～240 ℃ of insulations in the high-temperature heat treatment stove; Temperature retention time kept 0.5～3 hour by the timber of every centimetre of thickness; 3) temperature of reduction high-temperature heat treatment stove after temperature is reduced to below 100 ℃, is handled timber with steam or hot water, makes moisture content to 7～10% of timber; 4) continuation reduces the temperature in the high-temperature heat treatment stove, comes out of the stove after the timber temperature inside is reduced to about 40 ℃; 5) balance time more than 15 days in atmospheric environment.This Wood heat treatment method is under normal pressure, because when timber is heat-treated in the constant-pressure and high-temperature gas medium, its equilibrium moisture content is very low, and timber moisture gradient on the cross section changes greatly, particularly is easy to generate defectives such as cracking, shrinkage for high-moisture percentage or the bigger timber of thickness; Secondly, because the high-temperature heat treatment stove not being carried out vacuum decompression in the timber heat treatment incipient stage handles, therefore in the high-temperature heat treatment medium, the oxygen that must contain some so not only can quicken the oxidation of wood surface, influences timber high-temperature heat treatment quality, and compare with pure superheated steam, this kind high-temperature heat treatment medium specific heat and heat transfer coefficient are less, and its resistance to mass tranfer is big, the heat treatment cycle lengthening; Moreover this processing method is not considered the influence of programming rate to heat treatment process and effect, and randomness is bigger during process implementing.
Publication number is that the Chinese patent application of CN1868704A discloses " Wood carbonization treatment method ", this method adopts the continuous temperature-rising method of staged, temperature is warming up to 120～140 ℃ earlier, be warming up to 160～240 ℃ again, treat that the charing processing procedure finishes, spray atomized water and slowly be cooled to 100 ℃ that the saturated steam that feeds 100 ℃ then carries out damping moisture regain processing to timber by timber, the moisture content of timber is adjusted back 4～6%, and timber is cooled to temperature and is higher than kiln discharge after 15～30 ℃ of the room temperatures.Also under normal pressure, equilibrium moisture content is low in the charing processing procedure for this inventive method, and timber easily produces defectives such as cracking, shrinkage; Compare as the high-temperature heat treatment medium with pure superheated steam, the heat treatment cycle lengthening, and do not consider the influence of programming rate in the technology to heat treatment process and effect.
Publication number is that the Chinese patent application of CN101069972A discloses " a kind of preparation method of heat-treatment charred wood ", and this method comprises preparation, preheating, intensification, insulation and temperature-fall period.Temperature rise period wherein: medium temperature in the kiln is warmed up to 95～105 ℃ with the speed of 10～18 ℃/h; Then be warmed up to 120～130 ℃ material carried out high temperature drying, and the moisture content of timber inside almost drops to 0 with the speed of 3～8 ℃/h; Speed with 12～20 ℃/h is warmed up between 185～220 ℃ again; Adopting batch (-type) spray steaming method to spray to steam in this temperature rise period handles.This inventive method also under normal pressure, also exists equilibrium moisture content low in the charing processing procedure, timber easily produces defectives such as cracking, shrinkage; In the heat treatment carbonization process, adopt step spray to steam the processing damping, random big, relatively more difficult to control of product quality, the difficult and control of the quality of the timber of preparation.
Do not find as yet at present timber to be carried out the research document and the patent application of high-temperature process by improving environmental pressure.
Summary of the invention
The objective of the invention is to provide a kind of processing method of timber and the timber for preparing by this method at above prior art problems.The heat transfer medium of the inventive method is water vapour or the superheated steam under the certain pressure, because the specific heat and the heat transfer coefficient of superheated steam are big, and the heat treatment efficiency height.The inventive method can make timber keep higher equilibrium moisture content in processing procedure, and the timber of preparation has overcome seasoning defect drying defects such as cracking, shrinkage.
For realizing purpose of the present invention, one aspect of the present invention provides a kind of processing method of timber, comprises that the timber that is opposite to successively in the container carries out reduced pressure treatment, The pre-heat treatment, high-temperature pressurizing is handled and damping is handled.。
Wherein, the processing stage that described high-temperature pressurizing processing procedure comprising two, the temperature and pressure of control processing stage that wherein the temperature and pressure of the first processing stage control being lower than second.
Particularly, described is the high-temperature pressurizing drying stage first the processing stage, and treatment temperature is 110-140 ℃, is preferably 120-130 ℃; Absolute pressure is 0.1-0.4MPa, is preferably 0.2-0.4MPa; Described is the high-temperature pressurizing heat treatment stages second the processing stage, and treatment temperature is 180-260 ℃, is preferably 180-240 ℃; Pressure is 0.4-1.0MPa, is preferably 0.4-0.6MPa.
Wherein, through described make after first the processing stage moisture content reduce to≤6%, the described processing time second processing stage is 2-8 hour, is preferably 4-6 hour.
Particularly, described first the processing stage in, make timber be warming up to described 110-140 ℃ with 5-20 ℃/hour programming rate; Described second the processing stage in, make timber be warming up to described 180-260 ℃ with 10-30 ℃/hour programming rate.
Wherein, in the described reduced pressure treatment process, vacuumize so that the absolute pressure≤0.02MPa in the container; In the described preheating treatment procedure, control The pre-heat treatment temperature is 90-105 ℃.
Particularly, in the described reduced pressure treatment process, the reduced pressure treatment time is 15-60 minute; In the described preheating treatment procedure, adopt saturated steam that the timber in the container is carried out The pre-heat treatment, make wood surface temperature and its center temperature difference≤5 ℃.It is that timber in container applies saturated vapor that described damping is handled, and control timber temperature is that 90-105 ℃, pressure are normal pressure, and the processing time is 4-6 hour.
Especially, at normal temperatures, the timber in the container is carried out reduced pressure treatment, make the absolute pressure≤0.02MPa in the container.The alleged normal temperature of the present invention is 10-35 ℃; Described normal pressure is that absolute pressure is 0.1MPa.
Wherein, also comprise the timber processing of lowering the temperature, make timber be cooled to≤50 ℃ after discharging.
Particularly, described cooling is handled and is selected from air-cooled, water-cooled or cools off naturally.
Wherein, described timber adopts broadleaf or softwood; Described softwood is selected larch, China fir, masson pine, pine or Korean pine; Described broadleaf is selected poplar, toothed oak wood, Eucalyptus, Manchurian ash, birch or beech.
The present invention provides a kind of improved wood that is prepared from according to above-mentioned processing method on the other hand.
The present invention has following advantage:
1, the inventive method is handled the efficient height of timber, compare with the high-temperature heat treatment under the normal pressure, the treating of wood time is short, the treating of wood cycle is shortened to 1/2-1/10, the inventive method treating of wood efficient height, good uniformity has kept original color of timber and outward appearance, and energy consumption is low, has reduced production cost.
2, Wood treatment method of the present invention, the dimensional stability of handling back examination material is good, and the drying shrinkage that reduces timber effectively is wet to rise, thereby makes final woodwork that very high dimensional stability be arranged.Specific diameter, tangential gas are done the wet rate that rises and are descended 18%～52% mutually with untreated timber.
3, Wood treatment method of the present invention, timber is under the environment of steam or superheated steam all the time, guarantee that timber at high temperature remains higher equilibrium moisture content, reduced defectives such as the cracking of timber in processing procedure, shrinkage.
4, the inventive method is a heat transfer medium with the superheated steam under the certain pressure in timber pressurized high-temperature drying and heat treatment process, because the specific heat and the heat transfer coefficient of superheated steam are big, simultaneously because its unidirectional mass transfer, its resistance to mass tranfer can be ignored, processing time shortens greatly, the also corresponding minimizing of container casing radiation loss.So Wood treatment method energy savings of the present invention, the treating of wood cost is low.
5, the inventive method is particularly suitable for softwood, can improve and handle the uniformity that grease distributes in the timber of back, realizes ungrease treatment.
The specific embodiment
Embodiment 1
1, piling
With first moisture content is 50%, the larch sheet material of thickness 40mm, length 2000mm, width 100mm according to drying of wood mode piling after, be positioned in the withstand voltage high temperature thermal treatment of sealing;
2, decompression vacuum pumping
Under 25 ℃ the larchwood of the inside of withstand voltage high temperature thermal treatment being carried out decompression vacuum pumping handles, the absolute pressure of device interior is reached and remain 0.01MPa (be the relative vacuum degree for-0.09MPa), after absolute pressure is to keep 25min under the 0.01MPa state, close vavuum pump, stop to vacuumize;
3, The pre-heat treatment
In withstand voltage high temperature thermal treatment, feed saturated vapor, when treating that the interior absolute pressure of equipment reaches 0.1MPa, stop to feed saturated steam, opening heating system then puts the timber in the high temperature thermal treatment is carried out The pre-heat treatment, adopt the wood surface temperature of armouring chromel-constantan thermocouple thermometer mensuration and the temperature at timber center, until temperature difference≤5 at wood surface temperature and timber center ℃, obtain the The pre-heat treatment material, wherein, absolute pressure in the equipment remains 0.1MPa, and the temperature in the equipment remains 105 ℃;
4, high-temperature pressurizing is dry handles
Close the air outlet valve of withstand voltage high temperature thermal treatment, open heating system, to the The pre-heat treatment material heat temperature raising in the withstand voltage high temperature thermal treatment, carry out the dry processing of high-temperature pressurizing, the moisture content of the timber in equipment is 6%, makes the pressurization dry wood, wherein, the absolute pressure of control appliance inside is 0.3MPa, and temperature is 120 ℃, and heat temperature raising speed is 15 ℃/h;
5, high-temperature pressurizing heat treatment
The pressurization dry wood is continued heating, heat up, carry out high-temperature pressurizing heat treatment, make heat-treated wood, wherein the heat temperature raising speed in the control appliance is 15 ℃/h, and the device interior temperature is 240 ℃; Absolute pressure is 0.6MPa, is 240 ℃ in temperature, and absolute pressure is heat treatment 6h under the condition of 0.6MPa;
6, damping is handled
Open the relief valve of withstand voltage high temperature thermal treatment, pressure relief, making device interior pressure return to absolute pressure is 0.1MPa, then feed saturated vapor (pressure of saturated steam is 0.1MPa) to device interior, make the reduction of timber temperature and remain 100 ℃, be 0.1MPa in absolute pressure then, temperature is under 100 ℃ the condition timber to be carried out damping to handle, and reaches 7% until the moisture content of timber;
7, timber is taken out in cooling
After treating that the damping processing procedure finishes, adopt air-cooled cooling method, make timber temperature≤50 ℃ after, discharging.
Measure the density of improved wood, the compression strength that GB1935-91 " Method of testing in compressive strength parallel to grain of wood " measures improved wood, the bending strength that GB1936-91 " Method of testing in bending strength of wood " measures improved wood, the shearing strength that GB1937-91 " Method of testing in shearing stength parallel to grain of wood " measures improved wood, the tensile strength that GB1938-91 " Method of testing in tensile strength parallel to grain of wood " measures improved wood according to GB GB1933-91 " Method for determination of the density of wood ".The testing result of the performance indications of the timber of present embodiment preparation is as shown in table 1.
Embodiment 2
Except the absolute pressure of device interior in the decompression vacuum pumping processing procedure is 0.02MPa, the decompression vacuum pumping processing time is 60 minutes; Temperature in the equipment in the preheating treatment procedure is 95 ℃, is preheated to temperature difference≤4 ℃ at wood surface temperature and timber center; The absolute pressure of device interior is 0.4MPa in the dry processing procedure of high-temperature pressurizing, and the pressurization baking temperature is 130 ℃, and heat temperature raising speed is 10 ℃/h; The absolute pressure of device interior is 0.5MPa in the high-temperature pressurizing heat treatment process, and heat treatment temperature is 200 ℃, and heat temperature raising speed is 20 ℃/h, and heat treatment time is 4 hours; Feeding absolute pressure in the damping processing procedure is the saturated steam of 0.1MPa, after making the temperature of the timber in the equipment be reduced to 100 ℃, open condenser system, timber in the equipment is carried out cooling processing, make the temperature of timber in the equipment remain 85-95 ℃, reach outside 8% until the moisture content that makes timber, all the other are identical with embodiment 1.
Measure the density of improved wood, the compression strength that GB1935-91 " Method of testing in compressive strength parallel to grain of wood " measures improved wood, the bending strength that GB1936-91 " Method of testing in bending strength of wood " measures improved wood, the shearing strength that GB1937-91 " Method of testing in shearing stength parallel to grain of wood " measures improved wood, the tensile strength that GB1938-91 " Method of testing in tensile strength parallel to grain of wood " measures improved wood according to GB GB1933-91 " Method for determination of the density of wood ".The testing result of the performance indications of the timber of present embodiment preparation is as shown in table 1.
Embodiment 3
Except the absolute pressure of device interior in the high-temperature pressurizing heat treatment process is 0.4MPa, heat treatment temperature is 180 ℃, and heat temperature raising speed is 10 ℃/h, and heat treatment time is 4 hours; Feeding absolute pressure in the damping processing procedure is the saturated steam of 0.1MPa, after making the temperature of the timber in the equipment be reduced to 100 ℃, open condenser system, timber in the equipment is carried out cooling processing, making device interior timber temperature is 75-85 ℃, reach outside 9% until the moisture content that makes timber, all the other are identical with embodiment 1.
Measure the density of improved wood, the compression strength that GB1935-91 " Method of testing in compressive strength parallel to grain of wood " measures improved wood, the bending strength that GB1936-91 " Method of testing in bending strength of wood " measures improved wood, the shearing strength that GB1937-91 " Method of testing in shearing stength parallel to grain of wood " measures improved wood, the tensile strength that GB1938-91 " Method of testing in tensile strength parallel to grain of wood " measures improved wood according to GB GB1933-91 " Method for determination of the density of wood ".The testing result of the performance indications of the timber of present embodiment preparation is as shown in table 1.
Embodiment 4
Except adopting cottonwood plank stuff in the piling process, wherein the first moisture content of cottonwood plank stuff is 20%, thickness 40mm, length 1100mm, width 150mm; The absolute pressure of device interior is 0.015MPa in the decompression vacuum pumping processing procedure, and the decompression vacuum pumping processing time is 45 minutes; The absolute pressure of device interior is 0.4MPa in the dry processing procedure of high-temperature pressurizing, and the pressurization baking temperature is 130 ℃, and heat temperature raising speed is 10 ℃/h; The absolute pressure of device interior is 0.6MPa in the high-temperature pressurizing heat treatment process, and heat treatment temperature is 220 ℃, and heat temperature raising speed is 20 ℃/h, and heat treatment time is outside 4 hours, and all the other are identical with embodiment 1.
Measure the density of improved wood, the compression strength that GB1935-91 " Method of testing in compressive strength parallel to grain of wood " measures improved wood, the bending strength that GB1936-91 " Method of testing in bending strength of wood " measures improved wood, the shearing strength that GB1937-91 " Method of testing in shearing stength parallel to grain of wood " measures improved wood, the tensile strength that GB1938-91 " Method of testing in tensile strength parallel to grain of wood " measures improved wood according to GB GB1933-91 " Method for determination of the density of wood ".The testing result of the performance indications of the timber of present embodiment preparation is as shown in table 1.
Embodiment 5
Except adopting poplar in the piling process, wherein the first moisture content of poplar is 20%, thickness 40mm, length 1100mm, width 150mm; The absolute pressure of device interior is 0.01MPa in the decompression vacuum pumping processing procedure, and the decompression vacuum pumping processing time is 60 minutes; Temperature in the equipment in the preheating treatment procedure is 95 ℃; The absolute pressure of device interior is 0.2MPa in the high-temperature pressurizing dry run, and the pressurization baking temperature is 120 ℃, and heat temperature raising speed is 20 ℃/h; The absolute pressure of device interior is 0.4MPa in the high-temperature pressurizing heat treatment process, and heat treatment temperature is 200 ℃, and heat temperature raising speed is 30 ℃/h, and heat treatment time is 6 hours; Feeding absolute pressure in the damping processing procedure is the saturated steam of 0.1MPa, after making the temperature of the timber in the equipment be reduced to 100 ℃, open condenser system, timber in the equipment is carried out cooling processing, make the temperature of timber in the equipment remain 85-95 ℃, reach outside 8% until the moisture content that makes timber, all the other are identical with embodiment 1.
Measure the density of improved wood, the compression strength that GB1935-91 " Method of testing in compressive strength parallel to grain of wood " measures improved wood, the bending strength that GB1936-91 " Method of testing in bending strength of wood " measures improved wood, the shearing strength that GB1937-91 " Method of testing in shearing stength parallel to grain of wood " measures improved wood, the tensile strength that GB1938-91 " Method of testing in tensile strength parallel to grain of wood " measures improved wood according to GB GB1933-91 " Method for determination of the density of wood ".The testing result of the performance indications of the timber of present embodiment preparation is as shown in table 1.
Embodiment 6
Except adopting poplar in the piling process, wherein the first moisture content of poplar is 20%, thickness 40mm, length 1100mm, width 150mm; The absolute pressure of device interior is 0.3MPa in the high-temperature pressurizing dry run, and the pressurization baking temperature is 125 ℃, and heat temperature raising speed is 20 ℃/h; The absolute pressure of device interior is 0.4MPa in the high-temperature pressurizing heat treatment process, and heat treatment temperature is 180 ℃, and heat temperature raising speed is 20 ℃/h, and heat treatment time is 6 hours; Feeding absolute pressure in the damping processing procedure is the saturated steam of 0.1MPa, after making the temperature of the timber in the equipment be reduced to 100 ℃, open condenser system, timber in the equipment is carried out cooling processing, make the temperature of timber in the equipment remain 75-85 ℃, reach outside 9% until the moisture content that makes timber, all the other are identical with embodiment 1.
Measure the density of improved wood, the compression strength that GB1935-91 " Method of testing in compressive strength parallel to grain of wood " measures improved wood, the bending strength that GB1936-91 " Method of testing in bending strength of wood " measures improved wood, the shearing strength that GB1937-91 " Method of testing in shearing stength parallel to grain of wood " measures improved wood, the tensile strength that GB1938-91 " Method of testing in tensile strength parallel to grain of wood " measures improved wood according to GB GB1933-91 " Method for determination of the density of wood ".The testing result of the performance indications of the timber of present embodiment preparation is as shown in table 1.
The capability and performance testing result of table 1 timber
| Moisture content (%) | Density (g/cm 3) | Rift grain resistance to compression (MPa) | Rift grain tension (MPa) | Bending strength (MPa) | Parallel-to-grain shear (MPa) | Shear prependicular to the grain (MPa) | |
| Embodiment 1 | ??7 | ?0.54 | ??76.16 | ??64.94 | ??92.85 | ??9.33 | ??14.24 |
| Embodiment 2 | ??8 | ?0.59 | ??79.19 | ??77.16 | ??103.14 | ??11.17 | ??15.29 |
| Embodiment 3 | ??9 | ?0.62 | ??90.24 | ??97.12 | ??112.84 | ??12.07 | ??15.87 |
| Reference examples 1 | ??12 | ?0.68 | ??104.09 | ??146.82 | ??142.09 | ??16.37 | ??19.08 |
| Embodiment 4 | ??7 | ?0.39 | ??48.27 | ??58.90 | ??70.16 | ??9.66 | ??8.45 |
| Embodiment 5 | ??8 | ?0.43 | ??51.67 | ??72.08 | ??73.06 | ??10.25 | ??10.33 |
| Embodiment 6 | ??9 | ?0.45 | ??57.15 | ??77.82 | ??82.16 | ??10.23 | ??10.64 |
| Reference examples 2 | ??12 | ?0.47 | ??61.52 | ??80.94 | ??88.24 | ??11.92 | ??11.67 |
Testing result shows:
The wood dimensional stability of the inventive method preparation strengthens; Timber crack generation ratio, hygroscopicity, water absorbing properties significantly reduce; Its weatherability and corrosion resistance improve.The timber of the inventive method preparation reaches " carbonized wood " SB/T10508-2008 standard.
The bending strength of the timber of the inventive method preparation reaches 70.16-112.84MPa; The rift grain pressure resistance reaches 48.27-90.24MPa; The rift grain tension reaches 58.90-97.12MPa; Parallel-to-grain shear reaches 9.66-12.07MPa; Shear prependicular to the grain reaches 8.45-15.87MPa, and the timber of the inventive method preparation reaches " carbonized wood " SB/T10508-2008 standard.
Reference examples 1
With the employed untreated larch sheet material of embodiment 1-3 example 1 in contrast.
Reference examples 2
With the employed untreated cottonwood plank stuff of embodiment 4-6 example 2 in contrast.
Test routine wood dimensional stability test
Measure wet the rising property of the timber of embodiment 1-6 and reference examples 1-2 preparation according to GB1934.2-91 " Method for determination of the swelling of wood ".
At first the timber of embodiment 1-6 preparation and the timber of reference examples 1-2 are made the sample that is of a size of 20mm * 20mm * 20mm, sample is put into baking oven dries, dry by the fire to timber absolutely dry, the cooling back is in the center of each opposite face of sample, measure respectively radially and tangential size, accurately to 0.01mm; Afterwards sample is positioned over 20 ± 2 ℃ of temperature, moisture absorption is to dimensionally stable under relative humidity 65% scholar's 5% the condition.In moisture absorption process, every the variation of 6h examination survey timber size, when the difference of double measured value is no more than 0.2mm, think that promptly size reaches stable, measure then all samples radially with tangential size value, calculate the bulking factor of timber, testing result sees Table 2.
Table 2 timber bulking factor testing result
Result of the test shows: the bulking factor of the timber of the inventive method preparation is low, compare with untreated timber, radially, tangential gas does the wet rate of rising and distinguished decline 18.8-49.9%, 42.7-60.3%, and the Wood Dimensional Stability height that the inventive method prepares be described, timber is not yielding.
Claims (10)
1, a kind of processing method of timber is characterized in that comprising that the timber that is opposite to successively in the container carries out reduced pressure treatment, The pre-heat treatment, high-temperature pressurizing is handled and damping is handled.
2, processing method as claimed in claim 1 is characterized in that, the processing stage that described high-temperature pressurizing processing procedure comprising two, and the temperature and pressure of control processing stage that wherein the temperature and pressure of the first processing stage control being lower than second.
3, processing method as claimed in claim 2 is characterized in that, described temperature first processing stage is 110-140 ℃, and absolute pressure is 0.1-0.4MPa; Described temperature second processing stage is 180-260 ℃, and pressure is 0.4-1.0MPa.
4, processing method as claimed in claim 2 is characterized in that, through described make after first the processing stage moisture content reduce to≤6%, the described processing time second processing stage is 2-8 hour.
5, as the arbitrary described processing method of claim 2 to 4, it is characterized in that, described first the processing stage in, make timber be warming up to described 110-140 ℃ with 5-20 ℃/hour programming rate; Described second the processing stage in, make timber be warming up to described 180-260 ℃ with 10-30 ℃/hour programming rate.
6, as the arbitrary described processing method of claim 1 to 4, it is characterized in that, in the described reduced pressure treatment process, vacuumize so that the absolute pressure≤0.02MPa in the container; In the described preheating treatment procedure, control The pre-heat treatment temperature is that 90-105 ℃, pressure are normal pressure.
7, processing method as claimed in claim 6 is characterized in that, in the described reduced pressure treatment process, the reduced pressure treatment time is 15-60 minute; In the described preheating treatment procedure, adopt saturated steam that the timber in the container is carried out The pre-heat treatment, make wood surface temperature and its center temperature difference≤5 ℃.。
As the arbitrary described processing method of claim 1 to 4, it is characterized in that 8, in the described damping process, control timber temperature is that 90-105 ℃, pressure are under the normal pressure, applies saturated vapor to timber, keeps 4-6 hour.
9, as the arbitrary described processing method of claim 1 to 4, it is characterized in that also comprising to the timber processing of lowering the temperature, make timber be cooled to≤50 ℃ after discharging.
10, a kind of timber is characterized in that being prepared from according to the described method of claim 1-9.
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2009
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