CN107696213A - A kind of method of timber high temperature drying processing - Google Patents

A kind of method of timber high temperature drying processing Download PDF

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Publication number
CN107696213A
CN107696213A CN201711013594.XA CN201711013594A CN107696213A CN 107696213 A CN107696213 A CN 107696213A CN 201711013594 A CN201711013594 A CN 201711013594A CN 107696213 A CN107696213 A CN 107696213A
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timber
dry
kept
temperature
moisture content
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CN201711013594.XA
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CN107696213B (en
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陶国呈
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ZHEJIANG GUOZHEN FURNITURE CO Ltd
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ZHEJIANG GUOZHEN FURNITURE CO Ltd
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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
    • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
    • B27K5/001—Heating

Abstract

The present invention relates to a kind of method of timber high temperature drying processing, mainly include the following steps that：（1）Timber pile is sent into dry kiln；（2）Speed with 0.1 0.2 DEG C per minute makes timber heat up, and steam spraying is aided with temperature-rise period, after being warming up to 80 DEG C, is kept for a period of time；（3）110 130 DEG C are warming up to 0.1 0.2 DEG C per minute of speed again and fluctuation-type drying is carried out to timber, kept for a period of time, remove the moisture in timber, start to cool；（4）During cooling, the moisture exhausting port is opened, is down to 80 DEG C naturally, changes the gauze on wet-bulb thermometer, carries out post-processing；（5）Post-processing is：80 DEG C of dry-bulb temperature in the wet-and-dry-bulb thermometer is kept, it is 6 DEG C to control wet-bulb depression by steam spraying, is kept for 30 hours, the moisture content in timber is reached 7 8%, and the stress of timber is less than 1%；（6）Room temperature is cooled to, is discharged.This method can effectively reduce moisture content, and greatly shorten the time of the drying of wood.

Description

A kind of method of timber high temperature drying processing
Technical field
The invention belongs to Wood Drying Technology field, and in particular to a kind of method of timber high temperature drying processing.
Background technology
Timber is one of most important raw material in human being's production life, can be used for being fabricated to various life and production use Product, but log fell after can not directly process, it is necessary to the moisture content of timber, which is reduced to certain value, to be used, general furniture In production, preferable moisture content is 7-8%, and stress and residual stress should be less than 2.5%, particular for high-grade solid wood man For tool production, stress and residual stress should be less than 1.5%, and the moisture content difference of separated layer water cut internal layer and outer layer is less than 1%.But In fact, most of timber bought is underproof, checked from statistics, the moisture content base of the so-called kiln dried wood of outsourcing 10% is above in sheet, highest even can arrive 20%-25%, and its porous media is also uneven, and stress maximum is even up to More than 10%, Surface hardened layer degree is big, far can not reach actual requirement, so this kind of " dry " timber needs to dry again.But That the conventional drying processes time is longer, and high energy consumption, stress elimination ability, can not much meet lumber quality, produce into The requirement of degree and energy-conservation, therefore how to design one kind and can be effectively reduced moisture content, and greatly shorten the drying of wood Time and the technique that there is the timber high temperature drying of anti-mildew ability to handle, turn into the technical problem of this area urgent need to resolve.
The content of the invention
The present invention is in view of the shortcomings of the prior art, it is proposed that a kind of method of timber high temperature drying processing, this method can be with The moisture content of timber is effectively reduced, and greatly shortens the time of the drying of wood, and high temperature drying processing can be killed in timber The fungi and insect of the overwhelming majority, during high-temperature process, molecular structure can recombinate timber, and its physical property is notable Enhancing, substantially reduces the wet rate of drying shrinkage, stress meets the requirement of top-grade furniture, while wood internal microorganism and insect are rely life The nutriment deposited can be deteriorated, and be advantageous to timber and preserved for a long time.
In order to solve the above technical problems, the technical scheme that the present invention takes is：
The present invention proposes a kind of method of timber high temperature drying processing, it is characterised in that comprises the following steps：
（1）Timber pile is sent into dry kiln, while makes the stress and separated layer water cut of test piece measure timber；
（2）Timber is heated up with 0.1-0.2 DEG C per minute of speed, steam spraying is aided with temperature-rise period, control furnace air Humidity so that the equilibrium moisture content under temperature and humidity residing for timber is equal to the maximum of the timber separated layer water cut, is warming up to A period of time is kept after 80 DEG C, makes the internal layer of timber and exospheric temperature uniform；
（3）110-130 DEG C being warming up to 0.1-0.2 DEG C per minute of speed again and fluctuation-type drying being carried out to timber, undulating value is 10-20 DEG C, kept for a period of time, the moisture in timber is removed by the way of heating not steam discharge, cooling steam discharge, makes timber Internal layer moisture content drops to less than 5%, starts to cool；
（4）During cooling, the moisture exhausting port is opened, is down to 80 DEG C naturally, changes the gauze on wet-bulb thermometer, is carried out at the later stage Reason；
（5）Post-processing is：80 DEG C of dry-bulb temperature in the wet-and-dry-bulb thermometer is kept, wet and dry bulb is controlled by steam spraying Temperature difference is 6 DEG C, is kept for 30 hours, the moisture content in timber is reached 7-8%, and the stress of timber is less than 1%；
（6）Room temperature is cooled to, is discharged.
Further, in the step 2, the retention time is defined as according to lumber thickness：T1=K1δ+1（When δ >= 2.5cm, K1=2.5h/cm；As δ ＜ 2.5cm, T1=2.5h）, wherein, K1For coefficient, T1For the retention time, δ is lumber thickness.
Further, the specific steps that the fluctuation-type is dried include：80 DEG C keep after terminating, with 0.1-0.2 per minute DEG C speed often heat up 15 DEG C, open the moisture exhausting port of dry kiln, then cool 10 DEG C, be gradually heating to 110-130 DEG C.
Beneficial effects of the present invention include：The method of the invention can effectively reduce the moisture content of timber, and significantly Shorten the time of the drying of wood, and fungi and insect most in timber can be killed in high-temperature process, change wood The interior molecules combination of material, makes the moisture absorption ability of timber reduce, physical property significantly improves.Wood internal microorganism and evil simultaneously The nutriment that worm depends on for existence is removed, and is advantageous to timber and is preserved for a long time.
Embodiment
In order that those skilled in the art more fully understand technical scheme, with reference to specific embodiment to this Invention is described in further detail.The embodiments described below is exemplary, is only used for explaining the present invention, without being understood that For limitation of the present invention.Unreceipted particular technique or condition in the following example, according to described by document in the art Technology or condition carry out.
According to some embodiments of the present invention, the present invention is not easy the speed liter that dry timber uses 0.1 DEG C per minute Temperature, the timber easily dried are more than 0.1 DEG C, the speed heating less than or equal to 0.2 DEG C using per minute；It is whether easy for timber Dry the physical property that may depend on timber, such as gravity, micro- macrostructure, thickness, length and first moisture content factor；Simultaneously The timber that dry timber is not more than 25% for moisture content is chosen, if moisture content is too high, timber is yielding serious when drying, easily Cause timber crack, and timber reaches less than 25% in moisture content and dried, deformation degree caused by dehydration is smaller, is done using high temperature The possibility to be ftractureed during dry handling process is smaller, and high temperature drying processing method of the present invention solves the drying of wood well When the problem of ftractureing.Yi Gan timber have Korean pine, fish scale dragon spruce, Manchurian fir fir, Picea koraiensis Nakai, masson pine, China fir, pinus sylvestris var. mongolica, Linden, paulownia, sassafrases etc.；It is not easy the wooden coloured wood of dry timber, maple, thick Juglans mandshurica, cinnamomum camphora, Chinese catalpa wood, evergreen chinquapin, kaki, sweetgum, falls Ye Song, beech, Qinggang, Quercus acutissima, lotus wood, toothed oak, yellow wingceltis, thick red beech etc..
Embodiment 1：A kind of method of timber high temperature drying processing, timber choose easily dry Korean pine, specifically include following step Suddenly.
（1）The Korean pine pile that thickness is 2cm is sent into dry kiln, while makes stress and the layering of test piece measure timber Moisture content.
According to some embodiments of the present invention, the present invention is tested using multiple test pieces, and the layering of the timber is aqueous Rate includes the outer layer moisture content and internal layer moisture content of timber.
（2）Speed with 0.1 DEG C per minute makes timber heat up, and steam spraying is aided with temperature-rise period, controls furnace air Humidity so that the equilibrium moisture content under temperature and humidity residing for timber is equal to the maximum of the timber separated layer water cut, is warming up to After 80 DEG C, kept for a period of time, specifically, the retention time is according to T1=K1δ+1（As δ >=2.5cm, K1=2.5h/cm；Work as δ ＜ 2.5cm, T1=2.5h）, wherein, K1For coefficient, T1For the retention time, δ is lumber thickness, due to thickness δ=2cm of timber, meter Calculation is maintained time T1=2.5h, make the internal layer of timber and exospheric temperature uniform, the ectonexine for being advantageous to timber is synchronously dried.
According to some embodiments of the present invention, it is to be understood that open steam spraying of the present invention so that timber Internal layer and outer layer only heat up moist（I.e. equilibrium moisture content is slightly above timber internal layer moisture content）, top layer heat transfer rate is improved, is reached To the effect of heat penetration timber, and then the ectonexine moisture content is reached unanimity to maximum, but is no more than equilibrium moisture content, The present invention is preferably：The maximum of the timber ectonexine moisture content is equal to equilibrium moisture content.
（3）Again with 0.1 DEG C per minute of speed be warming up to 110 DEG C to timber carry out fluctuation-type drying, undulating value be 10- 20 DEG C, kept for a period of time, using heating, steam discharge, pressure do not increase slightly, and the mode of cooling steam discharge decompression removes the moisture in timber, The internal layer moisture content of timber is dropped to less than 5%, start to cool.
According to some embodiments of the present invention, the specific steps that fluctuation-type of the present invention is dried include：When 80 DEG C of holdings After end, 95 DEG C are warming up to 0.1 DEG C per minute of speed, opens the moisture exhausting port of dry kiln, is naturally cooling to 85 DEG C, then with every The speed of 0.1 DEG C of minute is warming up to 100 DEG C, then cools again, repetitive cycling, carries out fluctuation-type heating, i.e., often heats up 15 DEG C, The moisture exhausting port of dry kiln is opened, then is cooled 10 DEG C, 110 DEG C is gradually heating to, is then incubated.
（4）During cooling, the moisture exhausting port is opened, is down to 80 DEG C naturally, changes the gauze on wet-bulb thermometer, carries out the later stage Processing；
（5）Post-processing is：80 DEG C of dry-bulb temperature in the wet-and-dry-bulb thermometer is kept, wet and dry bulb is controlled by steam spraying Temperature difference is 6 DEG C, is kept for 30 hours, the moisture content in timber is reached 7-8%, and the stress of timber is less than 1%；
（6）Room temperature is cooled to, is discharged.
Embodiment 2：A kind of method of timber high temperature drying processing, timber are chosen and are not easy dry cinnamomum camphora, specifically includes following Step.
（1）The cinnamomum camphora pile that thickness is 3cm is sent into dry kiln, while makes stress and the layering of test piece measure timber Moisture content.
According to some embodiments of the present invention, the present invention is tested using multiple test pieces, and the layering of the timber is aqueous Rate includes the outer layer moisture content and internal layer moisture content of timber.
（2）Speed with 0.2 DEG C per minute makes timber heat up, and steam spraying is aided with temperature-rise period, controls furnace air Humidity so that the equilibrium moisture content under temperature and humidity residing for timber is equal to the maximum of the timber separated layer water cut, is warming up to A period of time is kept after 80 DEG C, specifically, the retention time is according to T1=K1δ+1（As δ >=2.5cm, K1=2.5h/cm；As δ ＜ 2.5cm, T1=2.5h）, wherein, K1For coefficient, T1For the retention time, δ is lumber thickness, due to thickness δ=3cm of timber, is calculated Be maintained time T1=8.5h, make the internal layer of timber and exospheric temperature uniform, the ectonexine for being advantageous to timber is synchronously dried.
According to some embodiments of the present invention, it is to be understood that open steam spraying of the present invention so that timber Internal layer and outer layer only heat up moist（I.e. equilibrium moisture content is slightly above timber internal layer moisture content）, top layer heat transfer rate is improved, is reached To the effect of heat penetration timber, and then the ectonexine moisture content is reached unanimity to maximum, but is no more than equilibrium moisture content, The present invention is preferably：The maximum of the timber ectonexine moisture content is equal to equilibrium moisture content.
（3）Again with 0.2 DEG C per minute of speed be warming up to 130 DEG C to timber carry out fluctuation-type drying, undulating value be 10- 20 DEG C, kept for a period of time, using heating, steam discharge, pressure do not increase slightly, and the mode of cooling steam discharge decompression removes the moisture in timber, The internal layer moisture content of timber is dropped to less than 5%, start to cool.
According to some embodiments of the present invention, the specific steps that fluctuation-type of the present invention is dried include：When 80 DEG C of holdings After end, 95 DEG C are warming up to 0.2 DEG C per minute of speed, opens the moisture exhausting port of dry kiln, is naturally cooling to 85 DEG C, then with every The speed of 0.2 DEG C of minute is warming up to 100 DEG C, then cools again, repetitive cycling, carries out fluctuation-type heating, i.e., often heats up 15 DEG C, The moisture exhausting port of dry kiln is opened, then is cooled 10 DEG C, 130 DEG C is gradually heating to, is then incubated.
（4）During cooling, the moisture exhausting port is opened, is down to 80 DEG C naturally, changes the gauze on wet-bulb thermometer, carries out the later stage Processing；
（5）Post-processing is：80 DEG C of dry-bulb temperature in the wet-and-dry-bulb thermometer is kept, wet and dry bulb is controlled by steam spraying Temperature difference is 6 DEG C, is kept for 30 hours, the moisture content in timber is reached 7-8%, and the stress of timber is less than 1%；
（6）Room temperature is cooled to, is discharged.
According to some embodiments of the present invention, for ensure programming rate, high temperature keep, the realization of the index such as wet down insulation, Heating medium temperature is every cubic metre big by area of dissipation during desiccated wood higher than 25O DEG C in drying equipment fin of the present invention In l5M2。
Inventor has found that high temperature drying processing method of the present invention can effectively reduce moisture content, make simultaneously Timber stress is less than 1%, and greatly shortens the time of the drying of wood, and exhausted big portion in timber can be killed in high-temperature process The fungi and insect divided, change the interior molecules combination of timber, remove the nutriment that microorganism and insect depend on for existence, favorably Preserved for a long time in timber, while the moisture absorption ability of timber reduces, physical property significantly improves.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example Property, only presently preferred embodiments of the present invention, it is impossible to be interpreted as limitation of the present invention, one of ordinary skill in the art is at this Above-described embodiment can be changed, changed in the range of invention, replaced and modification, meanwhile, for the general skill of this area Art personnel, according to the thought of the application, in specific embodiments and applications there will be changes.

Claims (3)

  1. A kind of 1. method of timber high temperature drying processing, it is characterised in that comprise the following steps：
    （1）Timber pile is sent into dry kiln, while makes the stress and separated layer water cut of test piece measure timber；
    （2）Timber is heated up with 0.1-0.2 DEG C per minute of speed, steam spraying is aided with temperature-rise period, control furnace air Humidity so that the equilibrium moisture content under temperature and humidity residing for timber is equal to the maximum of the timber separated layer water cut, is warming up to A period of time is kept after 80 DEG C, makes the internal layer of timber and exospheric temperature uniform；
    （3）110-130 DEG C being warming up to 0.1-0.2 DEG C per minute of speed again and fluctuation-type drying being carried out to timber, undulating value is 10-20 DEG C, kept for a period of time, the moisture in timber is removed by the way of heating not steam discharge, cooling steam discharge, makes timber Internal layer moisture content drops to less than 5%, starts to cool；
    （4）During cooling, the moisture exhausting port is opened, is down to 80 DEG C naturally, changes the gauze on wet-bulb thermometer, is carried out at the later stage Reason；
    （5）Post-processing is：80 DEG C of dry-bulb temperature in the wet-and-dry-bulb thermometer is kept, wet and dry bulb is controlled by steam spraying Temperature difference is 6 DEG C, is kept for 30 hours, the moisture content in timber is reached 7-8%, and the stress of timber is less than 1%；
    （6）Room temperature is cooled to, is discharged.
  2. 2. according to the method for claim 1, it is characterised in that in the step 2, the retention time is according to lumber thickness It is defined as：T1=K1δ+1（As δ >=2.5cm, K1=2.5h/cm；As δ ＜ 2.5cm, T1=2.5h）, wherein, K1For coefficient, T1To protect Hold the time, δ is lumber thickness.
  3. 3. according to the method for claim 1, it is characterised in that the specific steps that the fluctuation-type is dried include：80 DEG C of guarantors After holding end, often heated up 15 DEG C with 0.1-0.2 DEG C per minute of speed, open the moisture exhausting port of dry kiln, then cooled 10 DEG C, gradually It is warming up to 110-130 DEG C.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108955116A (en) * 2018-07-18 2018-12-07 内蒙古农业大学 A kind of Wood drying apparatus and drying means

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007144866A (en) * 2005-11-29 2007-06-14 Shinshiba Setsubi:Kk Method and device for humidity-conditioning/drying wood
JP2013177999A (en) * 2012-02-28 2013-09-09 Okayama Prefecture Timber drying method and drying device for timber
CN103791701A (en) * 2012-10-31 2014-05-14 杜慕楠 Quick soft timber drying kiln and drying method thereof
CN105180640A (en) * 2015-10-19 2015-12-23 东北林业大学 Multi-parameter monitoring wood-drying method
CN107234693A (en) * 2017-05-18 2017-10-10 朱贝康 A kind of method of drying of wood processing

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007144866A (en) * 2005-11-29 2007-06-14 Shinshiba Setsubi:Kk Method and device for humidity-conditioning/drying wood
JP2013177999A (en) * 2012-02-28 2013-09-09 Okayama Prefecture Timber drying method and drying device for timber
CN103791701A (en) * 2012-10-31 2014-05-14 杜慕楠 Quick soft timber drying kiln and drying method thereof
CN105180640A (en) * 2015-10-19 2015-12-23 东北林业大学 Multi-parameter monitoring wood-drying method
CN107234693A (en) * 2017-05-18 2017-10-10 朱贝康 A kind of method of drying of wood processing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108955116A (en) * 2018-07-18 2018-12-07 内蒙古农业大学 A kind of Wood drying apparatus and drying means

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Denomination of invention: A method of high temperature drying of wood

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