CN101700668A - Wood compression carbonization sizing method - Google Patents
Wood compression carbonization sizing method Download PDFInfo
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- CN101700668A CN101700668A CN200910205068A CN200910205068A CN101700668A CN 101700668 A CN101700668 A CN 101700668A CN 200910205068 A CN200910205068 A CN 200910205068A CN 200910205068 A CN200910205068 A CN 200910205068A CN 101700668 A CN101700668 A CN 101700668A
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Abstract
The invention provides a wood compression carbonization sizing method capable of improving the size stability of compression wood, which comprises the following steps of: compressing with compression ratio of 15-30 percent after softening wood; and then carrying out high-temperature vapour treatment in a drying chamber, wherein the moisture content of the treated wood is controlled between 6-8 percent. Starting from the reason of causing the size change of the wood, hydroxyl in the wood is damaged or combined by the high-temperature vapour treatment of the wood, thereby lowering the moisture absorption and enabling the size stability of the wood to be improved. In addition, the internal stress of the wood is eliminated by the high-temperature vapour treatment, and the moisture content at various positions of the wood is basically same (the moisture content is uniform). The method not only ensures the uniformity of the moisture content, but also lowers the internal stress of the wood, and reduces the wood moisture absorption, thus the wood size is not changed greatly with good size stability.
Description
Technical field
The present invention relates to the timber method for shaping after the compression.
Background technology
Low-quality timber has a lot, as pine, China fir, poplar etc., their density is low, mechanical strength is low, price is low, is industrial cut stock (as be used for papermaking, be used to make fiberboard, glued board, woodwork plate etc.), is unsuitable for being used for top grade materials such as furniture, decoration, building materials.In order to improve low-quality timber economic worth, to enlarge its purposes, must improve its intensity.Timber can improve intensity after overcompression.But the size instability of compression wood, easily resilience causes density to reduce, particularly make finished product after, resilience makes product deformation, influence is used.
Summary of the invention
The purpose of this invention is to provide a kind of Wood compression carbonization sizing method that can improve the dimensional stability of compression wood.
This Wood compression carbonization sizing method, it comprises the steps: that timber compresses after softening, compression ratio is 15-30%; Timber after compression is placed on and carries out high-temperature steam processing (being commonly called as the carbonization of wood) in the hothouse, and the moisture content of timber is controlled at 6-8% after treatment.
The main cause that causes the timber size variation may be that variation, the moisture content of timber (on average) moisture content is inhomogeneous and internal stress is bigger.------has many free hydroxyl groups to the cell wall substance of timber in the chemical compositions such as cellulose and hemicellulose, they have very strong wettability power under certain temperature and humidity conditions, and wherein especially with the hygroscopic effect maximum of hemicellulose, so timber has hygroscopicity.And along with desorb or hygroscopic effect take place when moisture content is lower than fibre saturated point (generally 25%～30%) timber; water layer can attenuation and draw close or thickening and stretching in the wood cell wall between fibril, between microfibril and between crystallite, thereby causes cell membrane and even whole timber size to change.As seen from the above analysis, for certain specific timber, if fix its moisture content amplitude of variation, then cause in the wood cell wall between fibril, between microfibril and the degree that distance changes between crystallite be certain, therefore if will improve wood dimensional stability, essential method is to reduce its hygroscopicity, reduces the moisture content fluctuation that timber causes because of ambient humidity changes.The present invention sets about from causing the internal cause that timber size changes, and by the timber high-temperature steam is handled, destroys the hydroxyl in the timber, thereby reduces its hygroscopicity, and wood dimensional stability is improved.The high-temperature steam processing procedure has also been eliminated the internal stress of timber effectively in addition, and makes timber moisture content everywhere basic identical (moisture content is even).Therefore this method has not only guaranteed the uniformity of moisture content, has also reduced wood internal stress, has reduced hydroscopicity of wood, so timber size does not have big variation, dimensional stability is good.
Lumber thickness * 100% before compression ratio among the present invention=(lumber thickness before the compression-compression back lumber thickness)/compression.Compression ratio is generally 15-30%, and compression ratio is too small, and the intensity that improves timber is with not obvious; Decrement is excessive, and the volume of timber of timber reduces big, and cost improves too many.Irrational excessive compression will cause the wood cell wall conquassation, reduce the intensity of timber on the contrary.So reasonably compress, also improve the intensity of timber easily, handle by high-temperature steam again, reach and improve the stable effect of compression back timber size.
For above-mentioned Wood compression carbonization sizing method, if described timber is soft broadleaf; The concrete grammar that high-temperature steam is handled is: timber process in hothouse heats up, is incubated, cools off three processes; During insulation, insulation is 4-6 hour under the condition of 100 ℃ of dry-bulb temperature 180-200 ℃, wet-bulb temperature.
For above-mentioned Wood compression carbonization sizing method, if described timber is softwood; The concrete grammar that high-temperature steam is handled is: timber process in hothouse heats up, is incubated, cools off three processes; During insulation, insulation is 3-4 hour under the condition of 100 ℃ of dry-bulb temperature 210-230 ℃, wet-bulb temperature.
For above-mentioned Wood compression carbonization sizing method, softening concrete grammar is: is timber that the ammoniacal liquor of 15-25% soaked 2-3 days with the mass percent concentration.
For above-mentioned Wood compression carbonization sizing method, when carrying out the high-temperature steam processing, the wind speed 7-10m/s in the hothouse.
Description of drawings
Fig. 1 is the temperature changing curve diagram that high-temperature steam is handled.
The specific embodiment
1. test material
Respectively with China fir, pine, poplar as test timber, each all makes the plank that is of a size of 200mm (rift grain, length direction) * 100mm (tangential, width) * 30mm (radially, thickness direction), respectively as embodiment (wood sample) 1-6, referring to table 1.
2. test method
Softening: each embodiment is placed in the hermetically sealed can, the ammoniacal liquor of the mass percent concentration in having shown in the table 1 in the hermetically sealed can, about 50 ℃ of ammonia temperature soaked by the time shown in the table 1.
Compression: the timber after will soaking is placed on the hot press, compresses along thickness direction, and compression ratio is referring to table 1.
High-temperature steam is handled: will compress back timber and put into the steam drying kiln, and by time in the table 2 (or Fig. 1) and corresponding temperature timber be carried out steam treatment.Wet bulb rose to wet bulb predetermined treatment temp T in the time of 16.5 hours
Wet h=100 ℃ (being saturated-steam temperature under the normal pressure), dry bulb rose to dry bulb predetermined treatment temp T in the time of 21.5 hours
Do h, be incubated then.To different embodiment, dry bulb predetermined treatment temp T
Do hAll different with temperature retention time, concrete numerical value sees Table 3.Begin cooling afterwards, to till room temperature.In the high-temperature steam processing procedure, the wind speed 7-10 meter per second in the dry kiln.Timber is after high-temperature steam is handled, and the moisture content of each embodiment is at 6-8%.
Table 2 is the high-temperature steam of embodiment 1 variations in temperature tables of data when handling, and the temperature changing curve diagram that Fig. 1 handles for the high-temperature steam of the embodiment 1 that draws out according to table 2 data is done temperature and is meant dry-bulb temperature among Fig. 1, and damp-warm syndrome is meant wet-bulb temperature.Variations in temperature tables of data and temperature changing curve diagram that the high-temperature steam of other embodiment is handled are similar to embodiment 12, do not provide.
Timber size rate of change assay method.At the thickness V that measures each embodiment kiln discharge day
0, then each embodiment is placed on temperature and is 25 ℃, humidity and be in 50% the thermostatic constant wet equipment.To be to start at a little on the date from dry kiln kiln discharge day, respectively 30,90, measured the thickness V of each embodiment on the 180th
30, V
90, V
180Size changing rate V
X=(V
X-V
0)/V
0* 100%, in this formula, subscript or subscript x are respectively 30,90,180, V
XExpression x day size rate of change, V
XBe illustrated in the thickness that x day records.
Can find out from table 3, after 30 days, the basic no change of each embodiment size.
Table 1
Table 2
Table 3
Claims (5)
1. Wood compression carbonization sizing method is characterized in that it comprises the steps: that timber compresses after softening, and compression ratio is 15-30%; Timber after compression is placed on and carries out the high-temperature steam processing in the hothouse, and the moisture content of timber is controlled at 6-8% after treatment.
2. Wood compression carbonization sizing method according to claim 1 is characterized in that: described timber is soft broadleaf; The concrete grammar that high-temperature steam is handled is: timber process in hothouse heats up, is incubated, cools off three processes; During insulation, insulation is 4-6 hour under the condition of 100 ℃ of dry-bulb temperature 180-200 ℃, wet-bulb temperature.
3. Wood compression carbonization sizing method according to claim 1 is characterized in that: described timber is softwood; The concrete grammar that high-temperature steam is handled is: timber process in hothouse heats up, is incubated, cools off three processes; During insulation, insulation is 3-4 hour under the condition of 100 ℃ of dry-bulb temperature 210-230 ℃, wet-bulb temperature.
4. Wood compression carbonization sizing method according to claim 1 is characterized in that: softening concrete grammar is: is timber that the ammoniacal liquor of 15-25% soaked 1-2 days with the mass percent concentration.
5. Wood compression carbonization sizing method according to claim 1 is characterized in that: when carrying out the high-temperature steam processing, and the wind speed 7-10m/s in the hothouse.
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| CN200910205068A CN101700668A (en) | 2009-10-23 | 2009-10-23 | Wood compression carbonization sizing method |
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Cited By (15)
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| CN102179854A (en) * | 2011-06-15 | 2011-09-14 | 南京林业大学 | Method for producing multi-layer solid-wood composite floor by densified poplar single board |
| CN102229170A (en) * | 2011-06-23 | 2011-11-02 | 中南林业科技大学 | Method for manufacturing high-quality poplar composite material |
| CN102407548A (en) * | 2011-09-09 | 2012-04-11 | 南京林业大学 | Method for manufacturing solid wood floorings by utilizing densified fast growing woods |
| CN102626940A (en) * | 2011-02-07 | 2012-08-08 | 刘锡丽 | Solid wood section improving method and sections improved thereby |
| CN102699970A (en) * | 2012-05-22 | 2012-10-03 | 浙江庆元欧迪实业有限公司 | Modified production method and modified production device for poplar pencil board |
| CN102785274A (en) * | 2011-05-17 | 2012-11-21 | 南京林业大学 | Pretreatment method used before processing fast growing wood surface concave-convex textures |
| CN103481348A (en) * | 2013-09-04 | 2014-01-01 | 华南农业大学 | Integral reinforced solid wood section bar and manufacturing method thereof |
| CN103552142A (en) * | 2013-10-29 | 2014-02-05 | 内蒙古农业大学 | Method for integrally densifying, drying and carbonizing wood |
| CN105690512A (en) * | 2016-03-22 | 2016-06-22 | 浙江农林大学 | Production method for high-temperature heat treatment of bamboo bunch |
| CN106239662A (en) * | 2016-08-30 | 2016-12-21 | 开平市瑞兴木业制品有限公司 | A kind of fast growing wood is in situ the most closely knit and has the system of processing of absorption property |
| CN106426484A (en) * | 2015-10-09 | 2017-02-22 | 江苏柚尊家居制造有限公司 | Machining process of teak bed back board |
| CN107053397A (en) * | 2017-06-13 | 2017-08-18 | 中国林业科学研究院木材工业研究所 | A kind of fixed method of compression wood deformation |
| CN107303692A (en) * | 2017-07-18 | 2017-10-31 | 厦门金牌厨柜股份有限公司 | A kind of preparation method of cabinet carbonized wood |
| CN109366670A (en) * | 2018-12-14 | 2019-02-22 | 贵州省林业科学研究院 | A kind of processing method of rapid densification charing enhancing wood performance |
| CN114062363A (en) * | 2021-11-23 | 2022-02-18 | 云南中烟工业有限责任公司 | Method for measuring tobacco stem shaping effect after stem pressing |
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2009
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| CN102626940A (en) * | 2011-02-07 | 2012-08-08 | 刘锡丽 | Solid wood section improving method and sections improved thereby |
| CN102626940B (en) * | 2011-02-07 | 2016-03-30 | 刘锡丽 | A kind of solid wood profile modification method and section bar thereof |
| CN102785274A (en) * | 2011-05-17 | 2012-11-21 | 南京林业大学 | Pretreatment method used before processing fast growing wood surface concave-convex textures |
| CN102179854A (en) * | 2011-06-15 | 2011-09-14 | 南京林业大学 | Method for producing multi-layer solid-wood composite floor by densified poplar single board |
| CN102229170A (en) * | 2011-06-23 | 2011-11-02 | 中南林业科技大学 | Method for manufacturing high-quality poplar composite material |
| CN102407548B (en) * | 2011-09-09 | 2014-07-23 | 南京林业大学 | Method for manufacturing solid wood floorings by utilizing densified fast growing woods |
| CN102407548A (en) * | 2011-09-09 | 2012-04-11 | 南京林业大学 | Method for manufacturing solid wood floorings by utilizing densified fast growing woods |
| CN102699970A (en) * | 2012-05-22 | 2012-10-03 | 浙江庆元欧迪实业有限公司 | Modified production method and modified production device for poplar pencil board |
| CN102699970B (en) * | 2012-05-22 | 2014-09-10 | 浙江庆元欧迪实业有限公司 | Modified production method for poplar pencil board |
| CN103481348A (en) * | 2013-09-04 | 2014-01-01 | 华南农业大学 | Integral reinforced solid wood section bar and manufacturing method thereof |
| CN103552142A (en) * | 2013-10-29 | 2014-02-05 | 内蒙古农业大学 | Method for integrally densifying, drying and carbonizing wood |
| CN106426484A (en) * | 2015-10-09 | 2017-02-22 | 江苏柚尊家居制造有限公司 | Machining process of teak bed back board |
| CN106426484B (en) * | 2015-10-09 | 2019-03-15 | 江苏柚尊家居制造有限公司 | A kind of processing technology of teak bed mooring backboard |
| CN105690512A (en) * | 2016-03-22 | 2016-06-22 | 浙江农林大学 | Production method for high-temperature heat treatment of bamboo bunch |
| CN106239662A (en) * | 2016-08-30 | 2016-12-21 | 开平市瑞兴木业制品有限公司 | A kind of fast growing wood is in situ the most closely knit and has the system of processing of absorption property |
| CN107053397A (en) * | 2017-06-13 | 2017-08-18 | 中国林业科学研究院木材工业研究所 | A kind of fixed method of compression wood deformation |
| CN107053397B (en) * | 2017-06-13 | 2018-09-28 | 中国林业科学研究院木材工业研究所 | A kind of fixed method of compression wood deformation |
| CN107303692A (en) * | 2017-07-18 | 2017-10-31 | 厦门金牌厨柜股份有限公司 | A kind of preparation method of cabinet carbonized wood |
| CN109366670A (en) * | 2018-12-14 | 2019-02-22 | 贵州省林业科学研究院 | A kind of processing method of rapid densification charing enhancing wood performance |
| CN114062363A (en) * | 2021-11-23 | 2022-02-18 | 云南中烟工业有限责任公司 | Method for measuring tobacco stem shaping effect after stem pressing |
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Open date: 20100505 |