CN108247788B - A method of for improving solid wood slab dimensional stability - Google Patents
A method of for improving solid wood slab dimensional stability Download PDFInfo
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- CN108247788B CN108247788B CN201611233822.XA CN201611233822A CN108247788B CN 108247788 B CN108247788 B CN 108247788B CN 201611233822 A CN201611233822 A CN 201611233822A CN 108247788 B CN108247788 B CN 108247788B
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- rewetting
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- wood slab
- hot
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- 239000002023 wood Substances 0.000 title claims abstract description 67
- 239000007787 solid Substances 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000012545 processing Methods 0.000 claims abstract description 48
- 238000001035 drying Methods 0.000 claims abstract description 31
- 238000007731 hot pressing Methods 0.000 claims abstract description 29
- 150000003839 salts Chemical class 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 239000007921 spray Substances 0.000 claims description 7
- 239000003595 mist Substances 0.000 claims description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims 1
- 238000010792 warming Methods 0.000 description 4
- 239000012267 brine Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Classifications
-
- 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
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/16—Inorganic impregnating agents
- B27K3/20—Compounds of alkali metals or ammonium
-
- 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
- B27K1/00—Damping wood
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B5/00—Drying solid materials or objects by processes not involving the application of heat
- F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2210/00—Drying processes and machines for solid objects characterised by the specific requirements of the drying good
- F26B2210/14—Veneer, i.e. wood in thin sheets
Abstract
The invention discloses a kind of methods for improving solid wood slab dimensional stability comprising: (1) hot-pressing drying processing is carried out to the solid wood slab, (2) carry out rewetting processing to step (1) treated solid wood slab；The hot-pressing drying processing includes two stages: heating vacuumize process and secondary temperature elevation processing, and the mass percentage of moisture is 1%-2% in the solid wood slab obtained after hot-pressing drying processing；The rewetting processing includes two stages: salt fog rewetting and steam rewetting, and the biodiversity percentage composition in solid wood slab obtained after above-mentioned rewetting processing is 8%.
Description
Technical field
The present invention relates to solid wood geothermal energy floors, and specifically, the present invention relates to improve solid wood slab dimensional stability
Method.
Background technique
Solid wooden floor board is with its true wooden vision, comfortable feel and environment friendly and by the blueness of consumer
It looks at, but when solid wooden floor board is used for geothermal environment, is easily deformed cracking, and as the domestic especially Yangtze river basin is to reality
The demand of the wooden heating floor is increasing, therefore, it is necessary to by a series of method to solid wooden floor board processing, to improve it
Dimensional stability, so that the problems such as solid wooden floor board avoids the occurrence of deformation, cracking, warpage under geothermal environment.
Summary of the invention
The present invention provides a kind of method for improving solid wood slab dimensional stability, which comprises
(1) hot-pressing drying processing is carried out to the solid wood slab；
(2) rewetting processing is carried out to step (1) treated solid wood slab,
Wherein, the hot-pressing drying, which is handled, includes:
(i) heat up vacuumize process, and the heating treatment includes rising to temperature from 76 DEG C with 4 DEG C/h of rate
100 DEG C, while so that air pressure is down to 175mbar from 1030mbar with 210-215mbar/ hours rates；
(ii) secondary temperature elevation is handled, and the secondary temperature elevation processing is included in the condition for maintaining the air pressure 175mbar of step (i)
Under so that temperature is risen to 140 DEG C from 100 DEG C with 10 DEG C/h of rate, continue 20-24 hours at 140 DEG C；
The mass percentage of moisture is 1%-2% in the solid wood slab obtained after above-mentioned hot-pressing drying processing；It is described
Rewetting is handled
(i) salt fog rewetting, it is the salt water mist of 8%-10% to upper that saliferous mass percentage is used under the conditions of 90-95 DEG C
It states the solid wood slab progress rewetting obtained after hot-pressing drying processing and continues 48 hours；
It (ii) is 100 DEG C in temperature, humidity carries out salt fog rewetting treated solid wood slab under conditions of being 85-90%
Steam rewetting is persistently no more than 5 days；The biodiversity percentage composition in solid wood slab obtained after above-mentioned rewetting processing is 8%.
In the secondary temperature elevation treatment process of hot-pressing drying processing, spray water to the solid wood slab, amount of water sprayed
Are as follows: 0.8-1.2kg/m2, water spray frequency is minute/time 10-15.
The solid wood slab is cooled to 90-95 DEG C after hot-pressing drying processing and carries out rewetting processing again.
The hot-pressing drying processing carries out in negative-pressure vacuum dry kiln.
The rewetting processing carries out in closed timber rewetting kiln.
Salt water mist in the salt fog rewetting is sodium chloride salt water mist.
Method for improving solid wood slab dimensional stability of the invention includes hot-pressing drying processing and rewetting processing two
The water content in a stage, the solid wood slab handled by hot-pressing drying is extremely low and right in hot-pressing drying treatment process
The solid wood slab handled is sprayed water, it is therefore prevented that in drying process slab crack, hot-pressing drying processing on the basis of into
Capable rewetting processing improves its moisture-proof dimensional stability so that solid wood slab absorbs certain salinity.Using method of the invention
Solid wood slab is handled, the density of solid wood slab itself is increased, improves the stability of solid wood slab, efficiently solve
Easily there is the problems such as deformation, cracking warpage for geothermal environment in solid wooden floor board.
Specific embodiment
The present invention is further illustrated by below in conjunction with specific embodiment it should be appreciated that hereafter
The purpose that embodiment is merely illustrative is not intended to limit the present invention, and the scope of the present invention is defined by the claims.
Using white rubber air-dired wood as illustrative solid wood slab, what is illustrated the present invention is used to improve solid wood the present embodiment
The method of the dimensional stability of slab, wherein the white rubber air-dired wood with a thickness of 20mm, aqueous mass percentage is
12%-14%, the method includes hot-pressing drying processing and rewetting to handle two steps, specific as follows:
(1) dialogue rubber air-dired wood carries out hot-pressing drying processing in negative-pressure vacuum dry kiln: the white rubber air-dired wood is in warm
It press dry and undergoes following two stages in dry processing step:
First stage is heating vacuumize process, largely combines water and Free water since white rubber air-dired wood itself contains,
So white rubber air-dired wood water loss quickly, to avoid timber deformation fracture, in negative-pressure vacuum dry kiln, is adopted in this stage
Hot pressing temperature is warming up to 100 DEG C from 76 DEG C with 4 DEG C/h of heating rate with oily heat-conducting system, while heating, is adopted
With negative-pressure vacuum dry technology, the dry kiln is vacuumized using vacuum pump, with decompression in 210-215mbar/ hours
Air pressure in the dry kiln is down to 175mbar from 1030mbar by rate, and white rubber air-dired wood is under negative pressure state, the boiling of water
Point is reduced with the increase of vacuum degree, thus the moisture vaporization volatilization being more advantageous in timber and the flowing speed for accelerating steam
Rate, to achieve the effect that improve wood drying rate；
Second stage is secondary temperature elevation processing, in this stage, with 10 DEG C/h of heating rate, by hot pressing temperature from 100
DEG C it is warming up to 140 DEG C, meanwhile, air pressure in negative-pressure vacuum dry kiln is maintained into 175mbar, maintains 20- after being warming up to 140 DEG C
24 hours, since dry kiln temperature is very high, and the moisture in dry kiln was extremely low, and white rubber air-dired wood is easy to crack, therefore, is
The white rubber air-dired wood of protection, dialogue rubber air-dired wood surface are sprayed water, and every 10-15 minutes spray is primary, are sprayed 10-12 time, every time spray
Moisture be 0.8-1.2kg/m2；Using being mountable to different parts and containing for white rubber air-dired wood different location can be monitored at any time
The probe of water rate monitors the moisture content of white rubber air-dired wood, and probe measures the white rubber air-dired wood after handling by above-mentioned hot-pressing drying
The mass percentage of middle moisture is 1%-2%.Above-mentioned hot-pressing drying processing carries out in negative-pressure vacuum dry kiln, negative-pressure vacuum
The heap wooden rule cun of the dry kiln body aluminum alloy materials good using resistance to compression anti-aging property, entire negative-pressure vacuum dry kiln can reach
6100*1600*1350(mm)；The negative-pressure vacuum dry kiln is also led using for adjusting heat flow to avoid there is hot-spot
It causes the drying of wood uneven and the shut-off valve to crack occurs.
Finally, 30-36 hours entire hot-pressing drying processing step used time, the white rubber gas handled by hot-pressing drying are dry
The thickness of material is about 18mm, and the density of water content 8%, white rubber air-dired wood increases, and stability greatly improves.
(2) the white rubber air-dired wood that step (1) is handled is naturally cooled to 90-95 DEG C, and is transferred to closed timber rewetting
In kiln (in the present embodiment, between negative-pressure vacuum dry kiln and closed timber rewetting kiln can by guide rail realize two kilns it
Between material Automatic Conveying), carry out rewetting processing, rewetting processing includes following two stages:
First stage uses salt fog rewetting, is up to 3500 liters/min of ring in closed timber rewetting kiln equipped with 6 air quantity
Shape high pressure blower and corrosion-resistant, high-intensitive PVC board brine drum, the brine drum are connected with nodeless mesh nozzle, in rewetting temperature
Under conditions of 90-95 DEG C, use air pressure gunite by brine drum containing sodium chloride mass percentage for 8%-10%'s
The white rubber air-dired wood surface obtained after salt atomized water spray to hot-pressing drying processing carries out rewetting processing in 48 hours, in air blower
High-speed circulating wind effect under, the salt fog is evenly distributed to solid wood steel slab surface；On the one hand this stage can increase white rubber gas
The salinity of bole is filled, and the density of white rubber air-dired wood is increased, on the other hand can be with to improve the stability of white rubber air-dired wood
So that white rubber air-dired wood more easily reachs metastable moisture absorption saturation state after absorbing certain salinity, it is dry to improve white rubber gas
The moisture-proof dimensional stability of material；
Second stage uses high temperature and humidity steam rewetting, is equipped in the closed timber rewetting kiln and is located at the rewetting kiln
One end of inside bottom, the steam generator that power is 24kw, will with 20 DEG C/h of heating rate in the rewetting kiln
Temperature is warming up to 100 DEG C from 90 DEG C, and adjusts the flow velocity of the steam generator to regulate and control the humidity in rewetting kiln for 85-
90%, it carries out the rewetting no more than 5 days and handles；
Wherein, the ink dedusting dress positioned at rewetting kiln inside bottom one end is additionally provided in the closed timber rewetting kiln
It sets, can effectively adsorb dust in kiln.
It is 8% that probe, which measures white rubber air-dired wood biodiversity percentage composition, and processing terminate for rewetting, and rewetting kiln naturally cools to
Kiln discharge after 30 DEG C of≤room temperature,；The time that entire rewetting step needs is 7 days or so.
Hot-pressing drying processing step in method of the invention carries out pressing dry place by the way of gradually pressurizeing, slowly heating up
Reason, compared with conventional drying, can effectively prevent solid wood to be sharply dehydrated and deform, crack, warpage.Rewetting processing step of the invention
Using salt fog rewetting and the processing of high temperature and humidity steam rewetting and entire rewetting step only need 7 days or so be the time, and it is common
Natural rewetting at least needs one month or so time to compare, and substantially reduces the rewetting processing time and there is no rewetting unevenness
Etc. drawbacks.
It is above-mentioned by method of the invention to measure using the method in LY/T1700-2007 " ground heating wood floors "
Handle the dimensional stability of obtained white rubber air-dired wood, the results showed that, the resistance to thermal dimensional stability of white rubber air-dired wood width direction
≤ 0.59%, moisture-proof dimensional stability≤0.50% of width direction, resistance to thermal dimensional stability≤0.07% of length direction, length
Moisture-proof dimensional stability≤0.07% in direction is spent, comply with the national standard requirements (the heat-resisting size of requirements of the national standard width direction
Stability≤1.5%, moisture-proof dimensional stability≤0.8%, the resistance to thermal dimensional stability of requirements of the national standard length direction≤
0.2%, moisture-proof dimensional stability≤0.2%, referring to " ground heating solid wooden floor board technical requirements and operating specification of mating formation ")；It is right
Routine in the prior art is used directly to press dry the final aqueous mass percentage that method obtains same for 8% white rubber air-dired wood
Also dimensional stability test is carried out, the results showed that, the resistance to thermal dimensional stability of width direction is the resistance to of 1.95%, width direction
Wet dimensional stability is 0.8%, and the resistance to thermal dimensional stability of length direction is 0.17%, the moisture-proof dimensional stability of width direction
It is 0.1%, does not meet requirements of the national standard.
It can be seen that by above-mentioned resistance to thermal dimensional stability data and moisture-proof dimensional stability data using side of the invention
The dimensional stability for the solid wood slab that method is handled meets national standard, and stability significantly larger than uses conventional method at present
Handle obtained solid wood slab.
Combining specific embodiment above, the present invention is described, these specific embodiments are only exemplary
, this does not limit the scope of protection of the present invention, and those skilled in the art can be under the premise of not departing from essence of the present invention
It carry out various modifications, change or replacement.Therefore, it according to various equivalent variationss made by the present invention, still falls within the present invention and is covered
Range.
Claims (5)
1. the method for improving solid wood slab dimensional stability, which comprises
(1) hot-pressing drying processing is carried out to the solid wood slab, the solid wood slab is white rubber class timber；
(2) rewetting processing is carried out to step (1) treated solid wood slab,
Wherein,
The hot-pressing drying is handled
(i) heat up vacuumize process, and the heating treatment includes so that temperature is risen to 100 from 76 DEG C with 4 DEG C/h of rate
DEG C, while so that air pressure is down to 175mbar from 1030mbar with 210-215mbar/ hours rates；
(ii) secondary temperature elevation is handled, under conditions of secondary temperature elevation processing includes the air pressure 175mbar for maintaining step (i),
So that temperature is risen to 140 DEG C from 100 DEG C with 10 DEG C/h of rate, continues 20-24 hours at 140 DEG C, and described secondary
During heating treatment, spray water to the solid wood slab, amount of water sprayed 0.8-1.2kg/m2, frequency of spraying water is 10-15 points
Clock/time, it sprays 10-12 times；
The mass percentage of moisture is 1%-2% in the solid wood slab obtained after above-mentioned hot-pressing drying processing；
The rewetting is handled
(i) salt fog rewetting, it is the salt water mist of 8%-10% to above-mentioned heat that saliferous mass percentage is used under the conditions of 90-95 DEG C
The solid wood slab that pressure obtains after being dried carries out rewetting and continues 48 hours；
It (ii) is 100 DEG C in temperature, humidity carries out the solid wood slab obtained after the processing of salt fog rewetting under conditions of being 85-90%
Steam rewetting is persistently no more than 5 days；The biodiversity percentage composition in solid wood slab obtained after above-mentioned rewetting processing is 8%.
2. the method for claim 1, wherein the solid wood slab is cooled to after hot-pressing drying processing
90-95 DEG C carries out rewetting processing again.
3. the method for claim 1, wherein the hot-pressing drying processing carries out in negative-pressure vacuum dry kiln.
4. the method for claim 1, wherein the rewetting processing carries out in closed timber rewetting kiln.
5. the method for claim 1, wherein the salt water mist in the salt fog rewetting is sodium chloride salt water mist.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611233822.XA CN108247788B (en) | 2016-12-28 | 2016-12-28 | A method of for improving solid wood slab dimensional stability |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611233822.XA CN108247788B (en) | 2016-12-28 | 2016-12-28 | A method of for improving solid wood slab dimensional stability |
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| CN108247788A CN108247788A (en) | 2018-07-06 |
| CN108247788B true CN108247788B (en) | 2019-08-02 |
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| CN110625718A (en) * | 2019-08-27 | 2019-12-31 | 中山市大自然木业有限公司 | Method for improving dimensional stability of solid wood board |
| CN114986638B (en) * | 2022-06-13 | 2023-06-20 | 浙江省林业科学研究院 | Preparation method of green mildew-proof bamboo wood for food contact |
Citations (4)
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|---|---|---|---|---|
| JPH05177769A (en) * | 1991-11-27 | 1993-07-20 | Kureha Plast Kk | Coated particle board and production thereof |
| CN101745947A (en) * | 2010-02-03 | 2010-06-23 | 中国林业科学研究院木材工业研究所 | Bamboo-wood composite board and preparation method thereof |
| CN103496023A (en) * | 2013-09-29 | 2014-01-08 | 巴洛克木业(中山)有限公司 | Method for manufacturing solid wood multilayer composite floor |
| CN105235040A (en) * | 2015-10-25 | 2016-01-13 | 中国林业科学研究院木材工业研究所 | Processing method of solid wood floor blanks used for floor heating |
-
2016
- 2016-12-28 CN CN201611233822.XA patent/CN108247788B/en active Active
Patent Citations (4)
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|---|---|---|---|---|
| JPH05177769A (en) * | 1991-11-27 | 1993-07-20 | Kureha Plast Kk | Coated particle board and production thereof |
| CN101745947A (en) * | 2010-02-03 | 2010-06-23 | 中国林业科学研究院木材工业研究所 | Bamboo-wood composite board and preparation method thereof |
| CN103496023A (en) * | 2013-09-29 | 2014-01-08 | 巴洛克木业(中山)有限公司 | Method for manufacturing solid wood multilayer composite floor |
| CN105235040A (en) * | 2015-10-25 | 2016-01-13 | 中国林业科学研究院木材工业研究所 | Processing method of solid wood floor blanks used for floor heating |
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Effective date of registration: 20231017 Address after: No. 1338 Gree Avenue, Economic Development Zone, Nankang District, Ganzhou City, Jiangxi Province, 341000 Patentee after: Ganzhou nature home furnishing Co.,Ltd. Address before: 528400 Nanwen Community First Industrial Zone (Makeng) Factory Building, Dayong Town, Zhongshan City, Guangdong Province Patentee before: ZHONGSHAN NATURE WOOD INDUSTRY Co.,Ltd. |
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