CN105276930B - A kind of method for suppressing drying of wood shrinkage - Google Patents
A kind of method for suppressing drying of wood shrinkage Download PDFInfo
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- CN105276930B CN105276930B CN201510709677.7A CN201510709677A CN105276930B CN 105276930 B CN105276930 B CN 105276930B CN 201510709677 A CN201510709677 A CN 201510709677A CN 105276930 B CN105276930 B CN 105276930B
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- 238000001035 drying Methods 0.000 title claims abstract description 68
- 239000002023 wood Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000018044 dehydration Effects 0.000 claims abstract description 23
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 23
- 238000001291 vacuum drying Methods 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000000835 fiber Substances 0.000 claims abstract description 15
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 15
- 230000006837 decompression Effects 0.000 claims abstract description 6
- 238000005086 pumping Methods 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 5
- 238000001704 evaporation Methods 0.000 claims description 5
- 230000008020 evaporation Effects 0.000 claims description 5
- 238000010304 firing Methods 0.000 claims description 5
- 238000005119 centrifugation Methods 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 2
- 238000000703 high-speed centrifugation Methods 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 230000037303 wrinkles Effects 0.000 description 3
- 244000166124 Eucalyptus globulus Species 0.000 description 2
- 241000124033 Salix Species 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005007 materials handling Methods 0.000 description 2
- 230000003340 mental effect Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Abstract
The present invention is the method for suppressing drying of wood shrinkage, is comprised the following steps：1）Timber stacking；2）Decompression vacuum pumping；3）Centrifugal dehydration；4）Vacuum drying；5）Timber is lowered the temperature；6）Timber kiln discharge：Allow drying chamber to recover normal pressure, then timber is unloaded from drying chamber.Advantages of the present invention：（1）By simultaneously after the dehydration of vacuum normal temperature high speed centrifugation, all by fast eliminating, this process completes timber dewatering and effectively prevent the wood shrinkage problem caused by Free water the Free water of timber；（2）Centrifugal dehydration is integrated with vacuum drying, under vacuum, under shrinkage critical-temperature, timber high-moisture percentage it is interval in, high speed centrifugation is carried out to timber and is dehydrated to fibre saturated point, effectively inhibit the Drying Collapse produced because Free water is removed；Centrifugal dehydration reduces great deal of investment with vacuum drying set, cost-effective, meets the requirement of the easy rapid production of shrinkage timber.
Description
Technical field
The present invention relates to accelerate the drying of wood and the method for suppressing drying of wood shrinkage under a kind of vacuum condition, that is, lead to
Cross and carry out high speed centrifugation pretreatment to timber and then be prevented effectively from the shrinkage defect that timber is produced in dehydration and drying process, belong to
In drying of wood field.
Background technology
Due to China's economic development, growth in the living standard, aesthetic conceptions considering health perception enhancing, increasing family
Occupy style and be more likely to naturalization, greenization and environment-friendlyization, thus solid wood furniture, solid wooden floor board and solid wood interior decoration are
Through as first-selection.However, the natural high-quality timber resource shortage of China, according to China and world forest resources situation, from now on quite
The raw material of China's woodwork industry will be based on artificial forest fast-growing material in a period of time.These materials will gradually be applied to wood
The products such as furniture, timber floor, Wood-door window, finishing deep to these quick-growing plantations, improve its comprehensive utilization ratio and add
Value is an only way.But the timber such as wildwood eucalyptus, willow of China's establishing in large scale during dry often
There is " shrinkage " this serious drying of wood defect, timber after drying, deformation, serious cracking, the substantial amounts of timber of generation
Inner splits, and causes dockage serious, it is impossible to be applied in the middle of solid wood furniture, floor and interior decoration, or even scraps completely.To mesh
Before untill, also not for avoiding the efficient drying method and processing means of wood shrinkage.Existing technology includes microwave, steams
Vapour, pre-freeze pretreatment and conventional stage formula dry and the later stage treatment etc. all can only slight reduction or part recover shrinkage, it is impossible to have
The catastrophic collapse produced in the suppression drying process of effect, and then it is efficient, high added value seriously to limit the timber such as eucalyptus, willow
Utilize.
The content of the invention
Proposed by the present invention is a kind of method for suppressing drying of wood shrinkage, the purpose is under vacuum by centrifugation
Power make timber in the range of high-moisture percentage fast dewatering without produce shrinkage, the timber after dehydration is in follow-up process of vacuum drying
In can accelerate rate of drying without produce Drying Collapse.
Technical solution of the invention：The method for suppressing drying of wood shrinkage：Comprise the following steps：
1）Timber stacking, selection is also easy to produce the timber of shrinkage, is processed into the sheet material of thickness 25mm ~ 38mm, according to conventional dry
Drying method stacking is simultaneously put into traditional vacuum drying chamber, closes tank door；
2）Decompression vacuum pumping, opens vavuum pump, reduces centrifugal drying tank vacuum, absolute pressure control 3.3 ~
6.7kPa, keeps in tank vacuum 0.5 to 1h；
3）Centrifugal dehydration, opens centrifuge, according to the interval adjustment centrifugal rotational speed of different water cut, timber is carried out it is quick from
The heart is dehydrated, and when moisture content is down to fibre saturated point, stops centrifuge work, is prevented effectively from timber due to capillary tension
Cause shrinkage, this is because before fibre saturated point, the Free water in timber is removed by centrifugation, and wood internal is deposited without Free water
Eliminating the condition of drying of wood shrinkage generation；
4）Vacuum drying, opens firing equipment and timber is heated, and Wood temperature carries out timber and does after rising most 35 ~ 45 DEG C
It is dry, heat and wet treatment is carried out, moisture content carries out heat and wet treatment in the middle of once, 52 DEG C of dry-bulb temperature, wet-bulb temperature 51 when being down to 20%
DEG C, process time is 3h；When moisture content is down to 8% or so, end of a period heat and wet treatment, 50 DEG C of dry-bulb temperature, wet-bulb temperature 47 are carried out
DEG C, process time is 4h, until moisture content reaches 8 ~ 10%；
5）Timber is lowered the temperature, and it is 6.7 ~ 13.4kPa to keep absolute pressure in tank, allows wood surface moisture evaporation and natural cooling
3 to 5h；Wood temperature is down to room temperature；
6）Timber kiln discharge：Allow traditional vacuum drying chamber to recover normal pressure, then timber is unloaded from drying chamber, complete timber and do
It is dry.
Advantages of the present invention：
（1）By after the dehydration of vacuum normal temperature high speed centrifugation, all by fast eliminating, this process is simultaneously for the Free water of timber
Complete timber dewatering and effectively prevent the wood shrinkage problem caused by Free water,
（2）Because wood internal exists without Free water, the Production conditions of Drying Collapse are eliminated, thus subsequently drying process does not have
There is a Drying Collapse defect, whole process reduces materials handling problem, improve drying of wood speed, it is to avoid drying of wood wrinkle
Contracting；
（3）When moisture content is more than fibre saturated point, by adjusting the rotating speed of centrifuge come in fast eliminating timber
While moisture, it is to avoid the shrinkage that timber is caused due to capillary tension；
（4）Centrifugal dehydration is integrated with vacuum drying, under vacuum, under shrinkage critical-temperature, timber high-moisture percentage
In interval, high speed centrifugation carried out to timber and is dehydrated to fibre saturated point, effectively inhibit the drying produced because Free water is removed
Shrinkage；Centrifugal dehydration reduces great deal of investment with vacuum drying set, cost-effective, meets the easy rapid production of shrinkage timber
Requirement.
Specific embodiment
Embodiment 1
The method for suppressing drying of wood shrinkage：Comprise the following steps：
1）Timber stacking, selection is also easy to produce the timber of shrinkage, certain thickness sheet material is processed into, according to conventional drying methods
Stacking is simultaneously put into centrifugal drying tank, and fixed by fixture, closes tank door；
2）Decompression vacuum pumping：Centrifugal drying tank is vacuumized at normal temperatures, absolute pressure reaches and is maintained in tank
3.3kPa, and make timber that 0.5h is placed in tank；
3）Centrifugal dehydration：It is room temperature to keep traditional vacuum tank, according to the interval adjustment centrifuge of the different moisture content of timber
When rotating speed, moisture content 60%, centrifugal rotational speed is 2000r/min；At 60 ~ 50%, centrifugal rotational speed is 3000r/min to moisture content；Contain
At 50 ~ 40%, centrifugal rotational speed is 5000r/min to water rate；At 40 ~ 30%, centrifugal rotational speed is 6000r/min to moisture content.To from
Timber carries out high speed centrifugation dehydration in heart tank, and wood internal Free water passes through centrifugal force and external and internal pressure under shrinkage critical-temperature
It is removed in the presence of difference, wood cell is not affected by capillary tension long term and then shrinkage can not occur；Treat that timber is aqueous
Rate stops centrifugal dehydration when being down to fibre saturated point, centrifuge stops；
4）Vacuum drying：Firing equipment is opened, temperature control is implemented vacuum and low temperature and done at 35 DEG C to timber in drying chamber
Dry, temperature is to cause the key factor of wood shrinkage, moisture content maintained below fibre saturated point vacuum in tank higher,
Wood rapid-drying just can be made using relatively low heating-up temperature and shrinkage does not occur；In process of vacuum drying, moisture content is down to 20%
Shi Jinhang once in the middle of heat and wet treatment, 52 DEG C of dry-bulb temperature, 50 DEG C of wet-bulb temperature, process time is 3h；When moisture content is down to 8%
During left and right, end of a period heat and wet treatment is carried out, 50 DEG C of dry-bulb temperature, 47 DEG C of wet-bulb temperature, process time is 4h.Heat and wet treatment is balanced
Stress in timber drying, treats that moisture content is down to 8%, stops drying；
5）Timber is lowered the temperature：Stop heating, and maintain traditional vacuum tank absolute pressure to allow timber table in the environment of 6.7kPa
Face moisture evaporation and natural cooling 3h；Wood temperature is down to room temperature；
6）Timber kiln discharge：Allow traditional vacuum drying chamber to recover normal pressure, then timber is unloaded from drying chamber, complete timber and do
It is dry.
Embodiment 2
The method for suppressing drying of wood shrinkage：Comprise the following steps：
1）Timber stacking, selection is also easy to produce the timber of shrinkage, certain thickness sheet material is processed into, according to conventional drying methods
Stacking is simultaneously put into centrifugal drying tank, and fixed by fixture, closes tank door；
2）Decompression vacuum pumping：Centrifugal drying tank is vacuumized at normal temperatures, absolute pressure reaches and is maintained in tank
6.7kPa, and make timber that 1h is placed in tank；
3）Centrifugal dehydration：It is room temperature to keep traditional vacuum tank, according to the interval adjustment centrifuge of the different moisture content of timber
Rotating speed, general trend is interval high-moisture percentage, and centrifugal rotational speed is low, and low-water-content is interval（It is more than fibre saturated point）, centrifugal rotational speed
It is high.It is specific as follows：At 60%, centrifugal rotational speed is 2000r/min to moisture content；At 60 ~ 50%, centrifugal rotational speed is moisture content
3000r/min；At 50 ~ 40%, centrifugal rotational speed is 5000r/min to moisture content；At 40 ~ 30%, centrifugal rotational speed is moisture content
6000r/min.Carry out high speed centrifugation dehydration to timber in tophan box, wood internal Free water under shrinkage critical-temperature by from
It is removed in the presence of mental and physical efforts and external and internal pressure difference, wood cell is not affected by capillary tension long term and then can not wrinkle
Contracting；Stop centrifugal dehydration when moisture content is down to fibre saturated point, centrifuge stops；
4）Vacuum drying：Firing equipment is opened, temperature control is implemented vacuum and low temperature and done at 45 DEG C to timber in drying chamber
Dry, temperature is to cause the key factor of wood shrinkage, moisture content maintained below fibre saturated point vacuum in tank higher,
Wood rapid-drying just can be made using relatively low heating-up temperature and shrinkage does not occur；In process of vacuum drying, moisture content is down to 20%
Shi Jinhang once in the middle of heat and wet treatment, 52 DEG C of dry-bulb temperature, 50 DEG C of wet-bulb temperature, process time is 3h；When moisture content is down to 8%
During left and right, end of a period heat and wet treatment is carried out, 50 DEG C of dry-bulb temperature, 47 DEG C of wet-bulb temperature, process time is 4h.Heat and wet treatment is balanced
Stress in timber drying, treats that moisture content is down to 10%, stops drying；
5）Timber is lowered the temperature：Stop heating, and maintain traditional vacuum tank absolute pressure to allow timber table in the environment of 13.4kPa
Face moisture evaporation and natural cooling 5h；Wood temperature is down to room temperature；
6）Timber kiln discharge：Allow traditional vacuum drying chamber to recover normal pressure, then timber is unloaded from drying chamber, complete timber and do
It is dry.
Embodiment 3
The method for suppressing drying of wood shrinkage：Comprise the following steps：
1）Timber stacking, selection is also easy to produce the timber of shrinkage, certain thickness sheet material is processed into, according to conventional drying methods
Stacking is simultaneously put into centrifugal drying tank, and fixed by fixture, closes tank door；
2）Decompression vacuum pumping：Centrifugal drying tank is vacuumized at normal temperatures, absolute pressure reaches and is maintained in tank
4.3kPa, and make timber that 0.8h is placed in tank；
3）Centrifugal dehydration：It is room temperature to keep traditional vacuum tank, according to the interval adjustment centrifuge of the different moisture content of timber
Rotating speed, general trend is interval high-moisture percentage, and centrifugal rotational speed is low, and low-water-content is interval（It is more than fibre saturated point）, centrifugal rotational speed
It is high.It is specific as follows：At 60%, centrifugal rotational speed is 2000r/min to moisture content；At 60 ~ 50%, centrifugal rotational speed is moisture content
3000r/min；At 50 ~ 40%, centrifugal rotational speed is 5000r/min to moisture content；At 40 ~ 30%, centrifugal rotational speed is moisture content
6000r/min.Carry out high speed centrifugation dehydration to timber in tophan box, wood internal Free water under shrinkage critical-temperature by from
It is removed in the presence of mental and physical efforts and external and internal pressure difference, wood cell is not affected by capillary tension long term and then can not wrinkle
Contracting；Stop centrifugal dehydration when moisture content is down to fibre saturated point, centrifuge stops；
4）Vacuum drying：Firing equipment is opened, temperature control is implemented vacuum and low temperature and done at 40 DEG C to timber in drying chamber
Dry, temperature is to cause the key factor of wood shrinkage, moisture content maintained below fibre saturated point vacuum in tank higher,
Wood rapid-drying just can be made using relatively low heating-up temperature and shrinkage does not occur；In process of vacuum drying, moisture content is down to 20%
Shi Jinhang once in the middle of heat and wet treatment, 52 DEG C of dry-bulb temperature, 50 DEG C of wet-bulb temperature, process time is 3h；When moisture content is down to 8%
During left and right, end of a period heat and wet treatment is carried out, 50 DEG C of dry-bulb temperature, 47 DEG C of wet-bulb temperature, process time is 4h.Heat and wet treatment is balanced
Stress in timber drying, treats that moisture content is down to 9%, stops drying；
5）Timber is lowered the temperature：Stop heating, and maintain traditional vacuum tank absolute pressure to allow wood surface in the environment of 7kPa
Moisture evaporation and natural cooling 4h；Wood temperature is down to room temperature；
6）Timber kiln discharge：Allow traditional vacuum drying chamber to recover normal pressure, then timber is unloaded from drying chamber, complete timber and do
It is dry.
By after the dehydration of vacuum normal temperature high speed centrifugation, the Free water of timber is all by fast eliminating, and this process is simultaneously complete
Into timber dewatering and the wood shrinkage problem caused by Free water is effectively prevent,
Because wood internal exists without Free water, the Production conditions of Drying Collapse are eliminated, thus subsequently drying process does not have
Drying Collapse defect, whole process reduces materials handling problem, improve drying of wood speed, it is to avoid drying of wood shrinkage.
The present invention centrifugal dehydration and vacuum drying are carried out simultaneously it is integrated, under vacuum, under shrinkage critical-temperature, it is wooden
In material high-moisture percentage is interval, high speed centrifugation is carried out to timber and is dehydrated to fibre saturated point, effectively inhibited because of Free water removing
The Drying Collapse of generation；Centrifugal dehydration reduces great deal of investment with vacuum drying set, cost-effective, meets easy shrinkage timber
The requirement of rapid production.
Claims (2)
1. the method for suppressing drying of wood shrinkage, it is characterized in that the method comprises the following steps：
1）Timber stacking, selection is also easy to produce the timber of shrinkage, the sheet material of thickness 25mm ~ 38mm is processed into, according to conventional drying side
Method stacking is simultaneously put into traditional vacuum drying chamber, closes tank door；
2）Decompression vacuum pumping, opens vavuum pump, reduces centrifugal drying tank vacuum, and absolute pressure control is protected in 3.3 ~ 6.7kPa
Hold in tank vacuum 0.5 to 1h；
3）Centrifugal dehydration, opens centrifuge, according to the interval adjustment centrifugal rotational speed of different water cut, quick centrifugation is carried out to timber de-
Water, when moisture content is down to fibre saturated point, stops centrifuge work；
4）Vacuum drying, opens firing equipment and timber is heated, and Wood temperature carries out the drying of wood after rising most 35 ~ 45 DEG C, enters
Row heat and wet treatment, moisture content carries out heat and wet treatment in the middle of once, 52 DEG C of dry-bulb temperature, 51 DEG C of wet-bulb temperature, treatment when being down to 20%
Time is 3h；When moisture content is down to 8% or so, end of a period heat and wet treatment, 50 DEG C of dry-bulb temperature, 47 DEG C of wet-bulb temperature, treatment are carried out
Time is 4h, until moisture content reaches 8 ~ 10%；
5）Timber is lowered the temperature, and it is 6.7 ~ 13.4kPa to keep absolute pressure in tank, allow wood surface moisture evaporation and natural cooling 3 to
5h；Wood temperature is down to room temperature；
6）Timber kiln discharge：Allow traditional vacuum drying chamber to recover normal pressure, then timber is unloaded from drying chamber, complete the drying of wood.
2. the method for suppressing drying of wood shrinkage according to claim 1, it is characterized in that described according to different water cut
Interval adjustment centrifugal rotational speed, when moisture content is 60%, centrifugal rotational speed is 2000r/min；At 60 ~ 50%, centrifugation turns moisture content
Speed is 3000r/min；At 50 ~ 40%, centrifugal rotational speed is 5000r/min to moisture content；Moisture content at 40 ~ 30%, centrifugal rotational speed
It is 6000r/min.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510709677.7A CN105276930B (en) | 2015-10-28 | 2015-10-28 | A kind of method for suppressing drying of wood shrinkage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510709677.7A CN105276930B (en) | 2015-10-28 | 2015-10-28 | A kind of method for suppressing drying of wood shrinkage |
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| Publication Number | Publication Date |
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| CN105276930A CN105276930A (en) | 2016-01-27 |
| CN105276930B true CN105276930B (en) | 2017-06-16 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106403506A (en) * | 2016-08-30 | 2017-02-15 | 贺州市恒达板业有限公司 | Drying technology for fast-growing wood |
| CN107036394B (en) * | 2017-05-04 | 2019-06-04 | 四川农业大学 | A kind of vacuum drying method of nanmu plate |
| CN107062809B (en) * | 2017-06-15 | 2019-05-24 | 浙江润格木业科技有限公司 | A kind of drying means of timber |
| CN108253741A (en) * | 2018-01-26 | 2018-07-06 | 桐乡市林达木业有限公司 | A kind of Wood rapid-drying method |
| CN110513966B (en) * | 2019-04-17 | 2021-01-26 | 宜华生活科技股份有限公司 | Wood dehydration, drying and carbonization integrated treatment equipment and treatment method thereof |
| CN114905593B (en) * | 2022-05-23 | 2022-12-30 | 茂友木材股份有限公司 | Shrinkage deformation control method for dyed and decorated veneer |
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|---|---|---|---|---|
| US4027401A (en) * | 1975-06-23 | 1977-06-07 | Fairbanks Jr John B | Method and structure for curing and/or treating wood |
| GB2306090A (en) * | 1995-09-15 | 1997-04-23 | English Country Furniture Limi | Drying timber by microwaves |
| CN101015925A (en) * | 2007-02-15 | 2007-08-15 | 吴义强 | Method for drying yate |
| CN101236048A (en) * | 2008-02-26 | 2008-08-06 | 中国林业科学研究院木材工业研究所 | Wood drying method |
| CN204665822U (en) * | 2015-04-14 | 2015-09-23 | 成都丰亚建材有限公司 | Furniture panel drying process device |
-
2015
- 2015-10-28 CN CN201510709677.7A patent/CN105276930B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4027401A (en) * | 1975-06-23 | 1977-06-07 | Fairbanks Jr John B | Method and structure for curing and/or treating wood |
| GB2306090A (en) * | 1995-09-15 | 1997-04-23 | English Country Furniture Limi | Drying timber by microwaves |
| CN101015925A (en) * | 2007-02-15 | 2007-08-15 | 吴义强 | Method for drying yate |
| CN101236048A (en) * | 2008-02-26 | 2008-08-06 | 中国林业科学研究院木材工业研究所 | Wood drying method |
| CN204665822U (en) * | 2015-04-14 | 2015-09-23 | 成都丰亚建材有限公司 | Furniture panel drying process device |
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Application publication date: 20160127 Assignee: Xianyou de Gu Furniture Co.,Ltd. Assignor: Nanjing Forestry University Contract record no.: 2018320000195 Denomination of invention: Method for inhibiting dry shrinking of timber Granted publication date: 20170616 License type: Common License Record date: 20181018 |
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Application publication date: 20160127 Assignee: JIANGSU TAIANDI ENVIRONMENTAL PROTECTION TECHNOLOGY CO.,LTD. Assignor: Nanjing Forestry University Contract record no.: 2018320000258 Denomination of invention: Method for inhibiting dry shrinking of timber Granted publication date: 20170616 License type: Common License Record date: 20181029 |
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Effective date of registration: 20231122 Address after: 710018 North Gate Shop 3F-308, Wenguangyuan Community, No. 12 Fenghua Road, Xi'an Economic and Technological Development Zone, Shaanxi Province Patentee after: Xi'an Deyi Education Technology Co.,Ltd. Address before: Nanjing City, Jiangsu province 210037 Longpan Road No. 159 Patentee before: NANJING FORESTRY University |