CN105276930A - Method for inhibiting dry shrinking of timber - Google Patents
Method for inhibiting dry shrinking of timber Download PDFInfo
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- CN105276930A CN105276930A CN201510709677.7A CN201510709677A CN105276930A CN 105276930 A CN105276930 A CN 105276930A CN 201510709677 A CN201510709677 A CN 201510709677A CN 105276930 A CN105276930 A CN 105276930A
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000002401 inhibitory effect Effects 0.000 title abstract 2
- 238000001035 drying Methods 0.000 claims abstract description 66
- 238000001291 vacuum drying Methods 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000000835 fiber Substances 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 239000002023 wood Substances 0.000 claims description 59
- 230000018044 dehydration Effects 0.000 claims description 23
- 238000006297 dehydration reaction Methods 0.000 claims description 23
- 229920006395 saturated elastomer Polymers 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 7
- 230000006837 decompression Effects 0.000 claims description 5
- 238000010304 firing Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- 230000001629 suppression Effects 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000010354 integration Effects 0.000 abstract 2
- 238000000703 high-speed centrifugation Methods 0.000 description 8
- 230000007547 defect Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000007774 longterm 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
- 238000005336 cracking Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Abstract
The invention provides a method for inhibiting dry shrinking of timber. The method comprises the following steps: 1) timber stacking; 2) decompressing and vaccumizing; 3) centrifugal dewatering; 4) vacuum drying; 5) timber cooling; and 6) timber taking out: restoring a drying tank to a normal pressure and taking the timber out of the drying tank. The method has the following advantages: (1) after vacuum normal-temperature high-speed centrifugal dewatering, free water of the timber is completely and quickly removed, and in the process, timber dewatering is completed and a timber shrinking problem due to the free water is effectively avoided; (2) due to the integration of centrifugal dewatering and vacuum drying, the timber is centrifugally dewatered at a high speed to a fiber saturation point under a vacuum condition, at a shrinking critical temperature and over a timber high moisture content range, and dry shrinking due to free water removal is effectively inhibited; and due to the integration of centrifugal dewatering and vacuum drying, equipment investment is substantially reduced and the cost is saved, and furthermore, a fast production requirement on timber not liable to shrink is met.
Description
Technical field
What the present invention relates to is a kind of method accelerated the drying of wood under vacuum condition and suppress drying of wood shrinkage, namely by the shrinkage defect of timber being carried out to high speed centrifugation pretreatment and then effectively avoid timber to produce in dehydration and dry run, drying of wood field is belonged to.
Background technology
Because China's economic development, growth in the living standard, aesthetic conceptions are considering the enhancing of health perception, increasing household style is more prone to naturalization, greenization and environmental friendliness, and thus solid wood furniture, solid wooden floor board and solid wood interior decoration have become first-selected.But the natural high-quality timber resource shortage of China, according to China and world forest resources situation, the raw material of China's woodwork industry in the quite a while from now on will based on artificial forest fast-growing material.These materials will be applied to the products such as wooden furniture, timber floor, Wood-door window gradually, and, fine finishining dark to these quick-growing plantations, improves its comprehensive utilization ratio and added value is an only way.But often there is " shrinkage " this serious drying of wood defect in the timber such as wildwood eucalyptus, willow of China's establishing in large scale in the process of drying, timber after drying, distortion, serious cracking, produce a large amount of timber Inner to split, cause dockage serious, cannot be applied in the middle of solid wood furniture, floor and interior decoration, scrap even completely.Up to the present, also not for efficient drying method and the process means of avoiding wood shrinkage.Existing technology comprises the dry and post-processed of microwave, steam, pre-freeze pretreatment and conventional stage formula etc. all slight reduction or part can only recover shrinkage, effectively can not suppress the catastrophic collapse produced in dry run, and then seriously limit that the timber such as eucalyptus, willow is efficient, the utilization of high added value.
Summary of the invention
What the present invention proposed is a kind of method suppressing drying of wood shrinkage, its objective is and make timber fast dewatering and the shrinkage do not produced within the scope of high-moisture percentage by centrifugal force under vacuum, the timber after dehydration can be accelerated rate of drying and not produce Drying Collapse in follow-up process of vacuum drying.
Technical solution of the present invention: suppress the method for drying of wood shrinkage: comprise the steps:
1) timber stacking, chooses the timber easily producing shrinkage, is processed into the sheet material of thickness 25mm ~ 38mm, conveniently drying means stacking put into traditional vacuum drying chamber, closes tank door;
2) decompression vacuum pumping, opens vavuum pump, and reduce centrifugal drying tank vacuum, absolute pressure controls at 3.3 ~ 6.7kPa, keeps vacuum 0.5 to 1h in tank;
3) centrifugal dehydration, open centrifuge, according to different water cut interval adjustment centrifugal rotational speed, quick centrifugal dehydration is carried out to timber, when moisture content is down to fibre saturated point, stop centrifuge work, effectively avoid timber to cause shrinkage due to capillary tension, this is due to before fibre saturated point, and the Free water in timber has been centrifuged and has removed, wood internal exists without Free water, eliminates the condition that drying of wood shrinkage produces;
4) vacuum drying, open firing equipment and heat timber, it is carry out the drying of wood after 35 ~ 45 DEG C that Wood temperature rises to, carry out heat and wet treatment, moisture content carries out intermediate heat wet process dry-bulb temperature 52 DEG C when being down to about 20%, wet-bulb temperature 51 DEG C, and the processing time is 3h; When moisture content is down to about 8%, carry out end of a period heat and wet treatment, dry-bulb temperature 50 DEG C, wet-bulb temperature 47 DEG C, the processing time is 4h, until moisture content reaches 8 ~ 10%;
5) timber cooling, keeps absolute pressure in tank to be 6.7 ~ 13.4kPa, allows wood surface moisture evaporate and naturally cools 3 to 5h; Wood temperature is down to room temperature;
6) timber kiln discharge: allow traditional vacuum drying chamber recover normal pressure, then unload timber in drying chamber, complete the drying of wood.
Advantage of the present invention:
(1) after the dehydration of vacuum normal temperature high speed centrifugation, the Free water of timber is all by fast eliminating, and this process completes timber dewatering simultaneously and effectively prevent the wood shrinkage problem caused because of Free water,
(2) because wood internal exists without Free water, eliminate the Production conditions of Drying Collapse, thus follow-up dry run does not have Drying Collapse defect, and whole process reduces materials handling problem, improves drying of wood speed, avoids drying of wood shrinkage;
(3), when moisture content is more than fibre saturated point, while carrying out fast eliminating Water In Wood by the rotating speed adjusting centrifuge, the shrinkage that timber causes due to capillary tension is avoided;
(4) centrifugal dehydration and vacuum drying integrated, under vacuum, under shrinkage critical-temperature, in timber high-moisture percentage interval, carries out high speed centrifugation dehydration to fibre saturated point to timber, effectively inhibits the Drying Collapse produced because Free water removes; Centrifugal dehydration and vacuum drying set reduce great deal of investment, cost-saving, meet the requirement of the rapid production of easy shrinkage timber.
Detailed description of the invention
Embodiment 1
Suppress the method for drying of wood shrinkage: comprise the steps:
1) timber stacking, chooses the timber easily producing shrinkage, is processed into certain thickness sheet material, conveniently drying means stacking put into centrifugal drying tank, and is fixed by fixture, closes tank door;
2) decompression vacuum pumping: at normal temperatures centrifugal drying tank is vacuumized, in tank, absolute pressure reaches and remains on 3.3kPa, and makes timber place 0.5h in tank;
3) centrifugal dehydration: keep traditional vacuum tank to be room temperature, the moisture content interval different according to timber adjusts the rotating speed of centrifuge, and during moisture content 60%, centrifugal rotational speed is 2000r/min; Moisture content is 60 ~ 50% time, and centrifugal rotational speed is 3000r/min; Moisture content is 50 ~ 40% time, and centrifugal rotational speed is 5000r/min; Moisture content is 40 ~ 30% time, and centrifugal rotational speed is 6000r/min.Carry out high speed centrifugation dehydration to timber in tophan box, wood internal Free water is by being removed under the effect of centrifugal force and external and internal pressure difference under shrinkage critical-temperature, and wood cell is not subject to capillary tension long term and then shrinkage can not occurs; When moisture content is down to fibre saturated point, stop centrifugal dehydration, centrifuge stops;
4) vacuum drying: open firing equipment, in drying chamber, temperature controls between 35 DEG C, vacuum dehydrating at lower temperature is implemented to timber, temperature is the key factor causing wood shrinkage, and moisture content maintains vacuum in higher tank, adopts lower heating-up temperature just can make Wood rapid-drying and shrinkage not occur below fibre saturated point; In process of vacuum drying, carry out intermediate heat wet process dry-bulb temperature 52 DEG C when moisture content is down to about 20%, wet-bulb temperature 50 DEG C, the processing time is 3h; When moisture content is down to about 8%, carry out end of a period heat and wet treatment, dry-bulb temperature 50 DEG C, wet-bulb temperature 47 DEG C, the processing time is 4h.Heat and wet treatment balances the stress in timber drying, treats that moisture content is down to 8%, stops dry;
5) timber cooling: stop heating, and maintain traditional vacuum tank absolute pressure allow under the environment of 6.7kPa wood surface moisture evaporate and naturally cool 3h; Wood temperature is down to room temperature;
6) timber kiln discharge: allow traditional vacuum drying chamber recover normal pressure, then unload timber in drying chamber, complete the drying of wood.
Embodiment 2
Suppress the method for drying of wood shrinkage: comprise the steps:
1) timber stacking, chooses the timber easily producing shrinkage, is processed into certain thickness sheet material, conveniently drying means stacking put into centrifugal drying tank, and is fixed by fixture, closes tank door;
2) decompression vacuum pumping: at normal temperatures centrifugal drying tank is vacuumized, in tank, absolute pressure reaches and remains on 6.7kPa, and makes timber place 1h in tank;
3) centrifugal dehydration: keep traditional vacuum tank to be room temperature, the moisture content interval different according to timber adjusts the rotating speed of centrifuge, and general trend is that high-moisture percentage is interval, and centrifugal rotational speed is low, and low-water-content interval (more than fibre saturated point), centrifugal rotational speed is high.Specific as follows: moisture content is 60% time, and centrifugal rotational speed is 2000r/min; Moisture content is 60 ~ 50% time, and centrifugal rotational speed is 3000r/min; Moisture content is 50 ~ 40% time, and centrifugal rotational speed is 5000r/min; Moisture content is 40 ~ 30% time, and centrifugal rotational speed is 6000r/min.Carry out high speed centrifugation dehydration to timber in tophan box, wood internal Free water is by being removed under the effect of centrifugal force and external and internal pressure difference under shrinkage critical-temperature, and wood cell is not subject to capillary tension long term and then shrinkage can not occurs; When moisture content is down to fibre saturated point, stop centrifugal dehydration, centrifuge stops;
4) vacuum drying: open firing equipment, in drying chamber, temperature controls between 45 DEG C, vacuum dehydrating at lower temperature is implemented to timber, temperature is the key factor causing wood shrinkage, and moisture content maintains vacuum in higher tank, adopts lower heating-up temperature just can make Wood rapid-drying and shrinkage not occur below fibre saturated point; In process of vacuum drying, carry out intermediate heat wet process dry-bulb temperature 52 DEG C when moisture content is down to about 20%, wet-bulb temperature 50 DEG C, the processing time is 3h; When moisture content is down to about 8%, carry out end of a period heat and wet treatment, dry-bulb temperature 50 DEG C, wet-bulb temperature 47 DEG C, the processing time is 4h.Heat and wet treatment balances the stress in timber drying, treats that moisture content is down to 10%, stops dry;
5) timber cooling: stop heating, and maintain traditional vacuum tank absolute pressure allow under the environment of 13.4kPa wood surface moisture evaporate and naturally cool 5h; Wood temperature is down to room temperature;
6) timber kiln discharge: allow traditional vacuum drying chamber recover normal pressure, then unload timber in drying chamber, complete the drying of wood.
Embodiment 3
Suppress the method for drying of wood shrinkage: comprise the steps:
1) timber stacking, chooses the timber easily producing shrinkage, is processed into certain thickness sheet material, conveniently drying means stacking put into centrifugal drying tank, and is fixed by fixture, closes tank door;
2) decompression vacuum pumping: at normal temperatures centrifugal drying tank is vacuumized, in tank, absolute pressure reaches and remains on 4.3kPa, and makes timber place 0.8h in tank;
3) centrifugal dehydration: keep traditional vacuum tank to be room temperature, the moisture content interval different according to timber adjusts the rotating speed of centrifuge, and general trend is that high-moisture percentage is interval, and centrifugal rotational speed is low, and low-water-content interval (more than fibre saturated point), centrifugal rotational speed is high.Specific as follows: moisture content is 60% time, and centrifugal rotational speed is 2000r/min; Moisture content is 60 ~ 50% time, and centrifugal rotational speed is 3000r/min; Moisture content is 50 ~ 40% time, and centrifugal rotational speed is 5000r/min; Moisture content is 40 ~ 30% time, and centrifugal rotational speed is 6000r/min.Carry out high speed centrifugation dehydration to timber in tophan box, wood internal Free water is by being removed under the effect of centrifugal force and external and internal pressure difference under shrinkage critical-temperature, and wood cell is not subject to capillary tension long term and then shrinkage can not occurs; When moisture content is down to fibre saturated point, stop centrifugal dehydration, centrifuge stops;
4) vacuum drying: open firing equipment, in drying chamber, temperature controls between 40 DEG C, vacuum dehydrating at lower temperature is implemented to timber, temperature is the key factor causing wood shrinkage, and moisture content maintains vacuum in higher tank, adopts lower heating-up temperature just can make Wood rapid-drying and shrinkage not occur below fibre saturated point; In process of vacuum drying, carry out intermediate heat wet process dry-bulb temperature 52 DEG C when moisture content is down to about 20%, wet-bulb temperature 50 DEG C, the processing time is 3h; When moisture content is down to about 8%, carry out end of a period heat and wet treatment, dry-bulb temperature 50 DEG C, wet-bulb temperature 47 DEG C, the processing time is 4h.Heat and wet treatment balances the stress in timber drying, treats that moisture content is down to 9%, stops dry;
5) timber cooling: stop heating, and maintain traditional vacuum tank absolute pressure allow under the environment of 7kPa wood surface moisture evaporate and naturally cool 4h; Wood temperature is down to room temperature;
6) timber kiln discharge: allow traditional vacuum drying chamber recover normal pressure, then unload timber in drying chamber, complete the drying of wood.
After the dehydration of vacuum normal temperature high speed centrifugation, the Free water of timber is all by fast eliminating, and this process completes timber dewatering simultaneously and effectively prevent the wood shrinkage problem caused because of Free water,
Because wood internal exists without Free water, eliminate the Production conditions of Drying Collapse, thus follow-up dry run does not have Drying Collapse defect, and whole process reduces materials handling problem, improves drying of wood speed, avoids drying of wood shrinkage.
Centrifugal dehydration and vacuum drying are carried out integrated by the present invention simultaneously, under vacuum, under shrinkage critical-temperature, in timber high-moisture percentage interval, high speed centrifugation dehydration is carried out to fibre saturated point to timber, effectively inhibits the Drying Collapse produced because Free water removes; Centrifugal dehydration and vacuum drying set reduce great deal of investment, cost-saving, meet the requirement of the rapid production of easy shrinkage timber.
Claims (3)
1. suppress the method for drying of wood shrinkage, it is characterized in that the method comprises the steps:
1) timber stacking, chooses the timber easily producing shrinkage, is processed into the sheet material of thickness 25mm ~ 38mm, conveniently drying means stacking put into traditional vacuum drying chamber, closes tank door;
2) decompression vacuum pumping, opens vavuum pump, and reduce centrifugal drying tank vacuum, absolute pressure controls at 3.3 ~ 6.7kPa, keeps vacuum 0.5 to 1h in tank;
3) centrifugal dehydration, opens centrifuge, according to different water cut interval adjustment centrifugal rotational speed, carries out quick centrifugal dehydration to timber, when moisture content is down to fibre saturated point, stops centrifuge work;
4) vacuum drying, open firing equipment and heat timber, it is carry out the drying of wood after 35 ~ 45 DEG C that Wood temperature rises to, carry out heat and wet treatment, moisture content carries out intermediate heat wet process dry-bulb temperature 52 DEG C when being down to about 20%, wet-bulb temperature 51 DEG C, and the processing time is 3h; When moisture content is down to about 8%, carry out end of a period heat and wet treatment, dry-bulb temperature 50 DEG C, wet-bulb temperature 47 DEG C, the processing time is 4h, until moisture content reaches 8 ~ 10%;
5) timber cooling, keeps absolute pressure in tank to be 6.7 ~ 13.4kPa, allows wood surface moisture evaporate and naturally cools 3 to 5h; Wood temperature is down to room temperature;
6) timber kiln discharge: allow traditional vacuum drying chamber recover normal pressure, then unload timber in drying chamber, complete the drying of wood.
2. the method for the suppression drying of wood according to claim 1 shrinkage, is characterized in that described according to different water cut interval adjustment centrifugal rotational speed, and when moisture content is 60% time, centrifugal rotational speed is 2000r/min; Moisture content is 60 ~ 50% time, and centrifugal rotational speed is 3000r/min; Moisture content is 50 ~ 40% time, and centrifugal rotational speed is 5000r/min; Moisture content is 40 ~ 30% time, and centrifugal rotational speed is 6000r/min.
3. the method for the suppression drying of wood according to claim 1 shrinkage, it is characterized in that described carrying out heat and wet treatment: moisture content lower than 30% time enter drying phase under vacuum, intermediate heat wet process dry-bulb temperature 52 DEG C is carried out when moisture content is down to 20%, wet-bulb temperature 50 DEG C, the processing time is 3h; When moisture content is down to 8%, carry out end of a period heat and wet treatment, dry-bulb temperature 50 DEG C, wet-bulb temperature 47 DEG C, the processing time is 4h.
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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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| CN201510709677.7A CN105276930B (en) | 2015-10-28 | 2015-10-28 | A kind of method for suppressing drying of wood shrinkage |
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| CN105276930A true CN105276930A (en) | 2016-01-27 |
| CN105276930B CN105276930B (en) | 2017-06-16 |
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Cited By (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 |
| CN107036394A (en) * | 2017-05-04 | 2017-08-11 | 四川农业大学 | A kind of vacuum drying method of nanmu sheet material |
| CN107062809A (en) * | 2017-06-15 | 2017-08-18 | 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 |
| CN110513966A (en) * | 2019-04-17 | 2019-11-29 | 宜华生活科技股份有限公司 | A kind of timber dewatering, drying and carbonization integrated equipment for wastewater treatment and its processing method |
| CN114905593A (en) * | 2022-05-23 | 2022-08-16 | 茂友木材股份有限公司 | Shrinkage deformation control method for dyed decorative veneer |
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| 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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2015
- 2015-10-28 CN CN201510709677.7A patent/CN105276930B/en active Active
Patent Citations (5)
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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 |
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Cited By (8)
| 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 |
| CN107036394A (en) * | 2017-05-04 | 2017-08-11 | 四川农业大学 | A kind of vacuum drying method of nanmu sheet material |
| CN107062809A (en) * | 2017-06-15 | 2017-08-18 | 浙江润格木业科技有限公司 | A kind of drying means of timber |
| 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 |
| CN110513966A (en) * | 2019-04-17 | 2019-11-29 | 宜华生活科技股份有限公司 | A kind of timber dewatering, drying and carbonization integrated equipment for wastewater treatment and its processing method |
| CN114905593A (en) * | 2022-05-23 | 2022-08-16 | 茂友木材股份有限公司 | Shrinkage deformation control method for dyed decorative veneer |
| 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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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 |