CN110181637A - A method of reducing timber band shrinkage - Google Patents
A method of reducing timber band shrinkage Download PDFInfo
- Publication number
- CN110181637A CN110181637A CN201910432491.XA CN201910432491A CN110181637A CN 110181637 A CN110181637 A CN 110181637A CN 201910432491 A CN201910432491 A CN 201910432491A CN 110181637 A CN110181637 A CN 110181637A
- Authority
- CN
- China
- Prior art keywords
- timber
- moisture content
- reducing
- band shrinkage
- fixation pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000002023 wood Substances 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 230000009977 dual effect Effects 0.000 claims description 9
- 238000013016 damping Methods 0.000 claims description 4
- 238000007654 immersion Methods 0.000 claims description 2
- 230000009467 reduction Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 244000050510 Cunninghamia lanceolata Species 0.000 description 6
- 244000166124 Eucalyptus globulus Species 0.000 description 6
- 235000005456 Pinus sylvestris var mongolica Nutrition 0.000 description 5
- 241000114025 Pinus sylvestris var. mongolica Species 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 210000002421 cell wall Anatomy 0.000 description 2
- 238000007385 chemical modification Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- 241000723346 Cinnamomum camphora Species 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920006395 saturated elastomer Polymers 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
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/001—Heating
-
- 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
- B27K5/0085—Thermal treatments, i.e. involving chemical modification of wood at temperatures well over 100°C
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The invention discloses a kind of methods for reducing timber band shrinkage, comprising the following steps: step 1 adjusts moisture content to 20% ~ 30%；Timber in step 1 is placed in dry kiln or temperature and humidity regulator or baking oven by step 2, is adjusted environment temperature, is slowly reduced timber by moisture content in this context；While reducing moisture content, fixation pressure is applied to timber；Moisture content in step 2 is reduced to and is adapted with target use condition by step 3, and fixation pressure is continuously applied；Timber in step 3 is placed in vacuum condition and launch a surprise attack formula heat treatment by step 4, and fixation pressure is continuously applied；Step 5 will cool down after the treating of wood in step 4, and the fixed thickness of fixed length fixed width is examined.The present invention realizes the reduction of timber band shrinkage, and reduces that degree is controllable, uniform beneficial effect.
Description
Technical field
The invention belongs to timberphysics performances areas, and in particular to a method of reduce timber band shrinkage.
Background technique
Drying shrinkage is the build-in attribute of timber.When moisture content is below fibre saturated point, the reduction of moisture content
It will cause the reduction of timber size, i.e. drying shrinkage.When drying shrinkage occurs for timber, wood volume loss, the production cost increases.In addition,
Timber is a kind of anisotropic material, and the shrinkage of different directions has differences: rift grain shrinkage very little, is no more than 0.3%；But
Band shrinkage is very big, and from 3% to 12%, therefore wood shrinkage easily causes various forms of crackings and sticks up when water-cut variation
It is bent.For engineered wood element, the wood shrinkage because of caused by water-cut variation can make the loosening at component connector and break
It is bad.Therefore, wood shrinkage amount, especially band shrinkage are reduced, for reducing production cost, lumber quality is promoted, extends wood
Matter engineering material service life is of great significance.
At this stage, the control mode of wood shrinkage amount relies primarily on physical or chemical modification.Physical modification is mainly to wood
Material carries out high-temperature heat treatment, by wood cell wall part chemical constituent of degrading, its sensibility to moisture is reduced, to reduce
Wood shrinkage amount.Chemical modification mainly carries out medicament dipping to timber, and common medicament includes phenolic resin adhesive, furfural tree
Rouge, polyethylene glycol etc..When reducing wood shrinkage amount by the way of physical modification, due under long-time high temperature action, timber
Different degrees of degradation has occurred in the chemical constituent of cell wall, and strength of wood is caused to lose, and limits its use.When useization
When modified mode reduces wood shrinkage amount, there is uneven dipping, organic matter volatilization, production technology complexity and cost substantially
Increase.
Summary of the invention
The technical problem to be solved by the present invention is to overcome strength of wood of the existing technology loss, treatment process are uneven
Problem even, production technology is complex and costly provides a kind of process being simple and efficient, and realizes timber band shrinkage
It reduces, and reduces that degree is controllable, uniform beneficial effect.This method be based on poisson effect, timber length single direction or
The dual direction of length and width or length and the dual direction of thickness apply fixation pressure, to guarantee that timber is single in length respectively
Stretcher strain occurs for direction or the dual direction of length and width or length and the dual direction of thickness.Under the action of fixation pressure,
Duration poisson effect occurs for timber, and by launch aing surprise attack formula vacuum heat treatment, regular length single direction or length and width are dual
The stretcher strain of direction or length and the dual direction of thickness, to achieve the purpose that reduce shrinkage.
In order to solve the above technical problems, the present invention provides a kind of method for reducing timber band shrinkage, characterized in that packet
Include following steps:
Step 1 adjusts moisture content to 20%~30%；
Timber in step 1 is placed in dry kiln or temperature and humidity regulator or baking oven by step 2, is adjusted environment temperature, is made
Timber slowly reduces moisture content in this context；While reducing moisture content, fixation pressure is applied to timber；
Moisture content in step 2 is reduced to and is adapted with target use condition by step 3, and fixation pressure is held
It is continuous to apply；
Timber in step 3 is placed in vacuum condition and launch a surprise attack formula heat treatment by step 4, and fixation pressure continues
Apply；
Step 5 will cool down after the treating of wood in step 4, and the fixed thickness of fixed length fixed width is examined.
Preferably, in step 1, moisture content is adjusted by the method for immersion or high humidity damping.
Preferably, the method for the high humidity damping are as follows: be placed on timber in the environment of 100% humidity 4 weeks or more.
Preferably, in step 2, the environment temperature adjusting range is 40 DEG C~70 DEG C.
Preferably, in step 2, the direction of the application fixed force are as follows: length single direction or length and width are double
Double recipe to or length and the dual direction of thickness.
Preferably, in step 2, the numerical value of the described application fixed force be corresponding direction proportional elastic limit 5%~
20%.
Preferably, in step 2, the device of the application fixed force is G type carpenters' clamp.
Preferably, in step 3, the moisture content is reduced to 8%~15%.
Preferably, in step 4, in the vacuum condition, temperature is 160 DEG C~200 DEG C, time 2min-10min,
Vacuum degree is 0.01MPa-0.05MPa.
Advantageous effects of the invention:
(1) fixation pressure is continuously applied to timber based on poisson effect, the simple process is easy to operate, and timber after processing
Shrinkage uniformity is good；
(2) apply pressure value it is adjustable, therefore handle after timber shrinkage reduce degree it is controllable；
(3) after treatment by using the treatment method, timber band and the shrinkage difference of rift grain are reduced, thus caused warpage, deformation
It significantly reduces.
Specific embodiment
The invention will be further described below.Following embodiment is only used for clearly illustrating technical side of the invention
Case, and not intended to limit the protection scope of the present invention.
Embodiment 1:
Step 1 is adjusted its moisture content to 30% using Eucalyptus Wood.
Eucalyptus in step 1 is placed in dry kiln by step 2, and adjustment kiln temperature is 50 DEG C, makes Eucalyptus in the temperature
Moisture content is slowly reduced under degree environment；While reducing moisture content, fixation pressure is applied to Eucalyptus length direction, pressure value is
The 15% of rift grain proportional elastic limit.
Eucalyptus moisture content in step 2 is reduced to 15% by step 3, and fixation pressure is continuously applied.
Eucalyptus in step 3 is placed in vacuum condition and launch a surprise attack formula heat treatment by step 4, and temperature is 160 DEG C, when
Between be 10min, vacuum degree 0.01MPa, and fixation pressure is continuously applied.
Step 5 will cool down after the treating of wood in step 4, and the fixed thickness of fixed length fixed width is examined.
Embodiment 2:
Step 1 is adjusted its moisture content to 20% using wood of Cunninghamia lanceolata.
China fir in step 1 is placed in baking oven by step 2, and adjustment kiln temperature is 70 DEG C, makes China fir in the temperature
Moisture content is slowly reduced under environment；While reducing moisture content, fixation pressure, length are applied to China fir length and width direction
The pressure value in direction is the 5% of rift grain proportional elastic limit, and the pressure value of width direction is the 10% of transverse elasticity proportional limit.
China fir moisture content in step 2 is reduced to 10% by step 3, and fixation pressure is continuously applied.
China fir in step 3 is placed in vacuum condition and launch a surprise attack formula heat treatment by step 4, and temperature is 180 DEG C, when
Between be 5min, vacuum degree 0.05MPa, and fixation pressure is continuously applied；
Step 5 will cool down after the treating of wood in step 4, and the fixed thickness of fixed length fixed width is examined.
Embodiment 3:
Step 1 is adjusted its moisture content to 30% using pinus sylvestris var. mongolica timber.
Pinus sylvestris var. mongolica in step 1 is placed in climatic chamber by step 2, and adjustment kiln temperature is 40 DEG C, makes camphor tree
Pine slowly reduces moisture content under the temperature environment；While reducing moisture content, pinus sylvestris var. mongolica length and thickness direction are applied
Fixation pressure, the pressure value of length direction are the 10% of rift grain proportional elastic limit, and the pressure value of thickness direction is transverse elasticity
The 10% of proportional limit.
Pinus sylvestris var. mongolica moisture content in step 2 is reduced to 8% by step 3, and fixation pressure is continuously applied.
Pinus sylvestris var. mongolica in step 3 is placed in vacuum condition and launch a surprise attack formula heat treatment by step 4, and temperature is 200 DEG C,
Time is 10min, vacuum degree 0.05MPa, and fixation pressure is continuously applied；
Step 5 will cool down after the treating of wood in step 4, and the fixed thickness of fixed length fixed width is examined.
It is surveyed to according to the standard specimen of above three embodiments and comparative example (common wood without any processing)
Examination, test result is as follows table 1.
1 timber band drying shrinkage figureofmerit of table
Consolidated statement 1 is analyzed, and is compared using the processing timber of the method for the present invention with common wood, band shrinkage has
It is substantially reduced.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (9)
1. a kind of method for reducing timber band shrinkage, characterized in that the following steps are included:
Step 1 adjusts moisture content to 20% ~ 30%；
Timber in step 1 is placed in dry kiln or temperature and humidity regulator or baking oven by step 2, is adjusted environment temperature, is made timber
Moisture content is slowly reduced in this context；While reducing moisture content, fixation pressure is applied to timber；
Moisture content in step 2 is reduced to and is adapted with target use condition by step 3, and fixation pressure is persistently applied
Add；
Timber in step 3 is placed in vacuum condition and launch a surprise attack formula heat treatment by step 4, and fixation pressure is continuously applied；
Step 5 will cool down after the treating of wood in step 4, and the fixed thickness of fixed length fixed width is examined.
2. a kind of method for reducing timber band shrinkage according to claim 1, characterized in that in step 1, pass through
The method of immersion or high humidity damping adjusts moisture content.
3. a kind of method for reducing timber band shrinkage according to claim 2, characterized in that the high humidity damping
Method are as follows: be placed on timber in the environment of 100% humidity 4 weeks or more.
4. a kind of method for reducing timber band shrinkage according to claim 1, characterized in that described in step 2
Environment temperature adjusting range be 40 DEG C ~ 70 DEG C.
5. a kind of method for reducing timber band shrinkage according to claim 1, characterized in that described in step 2
Application fixed force direction are as follows: length single direction or the dual direction of length and width or length and the dual direction of thickness.
6. a kind of method for reducing timber band shrinkage according to claim 1, characterized in that described in step 2
Application fixed force numerical value be corresponding direction proportional elastic limit 5% ~ 20%.
7. a kind of method for reducing timber band shrinkage according to claim 1, characterized in that described in step 2
Application fixed force device be G type carpenters' clamp.
8. a kind of method for reducing timber band shrinkage according to claim 1, characterized in that described in step 3
Moisture content be reduced to 8% ~ 15%.
9. a kind of method for reducing timber band shrinkage according to claim 1, characterized in that described in step 4
Vacuum condition in, temperature be 160 DEG C ~ 200 DEG C, time 2min-10min, vacuum degree 0.01MPa-0.05MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910432491.XA CN110181637B (en) | 2019-05-23 | 2019-05-23 | Method for reducing wood cross grain drying shrinkage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910432491.XA CN110181637B (en) | 2019-05-23 | 2019-05-23 | Method for reducing wood cross grain drying shrinkage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110181637A true CN110181637A (en) | 2019-08-30 |
| CN110181637B CN110181637B (en) | 2020-11-10 |
Family
ID=67717511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910432491.XA Active CN110181637B (en) | 2019-05-23 | 2019-05-23 | Method for reducing wood cross grain drying shrinkage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110181637B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113352418A (en) * | 2021-05-08 | 2021-09-07 | 南京林业大学 | Method for enhancing longitudinal mechanical property of wood |
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| JP2004306579A (en) * | 2003-03-26 | 2004-11-04 | Kakuno Seisakusho:Kk | Drier for organism such as timber and drying method using it |
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2019
- 2019-05-23 CN CN201910432491.XA patent/CN110181637B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004306579A (en) * | 2003-03-26 | 2004-11-04 | Kakuno Seisakusho:Kk | Drier for organism such as timber and drying method using it |
| WO2010046696A1 (en) * | 2008-10-23 | 2010-04-29 | Kurawood Plc | Lignocellulosic material and modification of lignocellulosic material |
| CN106272841A (en) * | 2016-10-18 | 2017-01-04 | 南京林业大学 | A kind of manufacture method of special-shaped bamboo trunk |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113352418A (en) * | 2021-05-08 | 2021-09-07 | 南京林业大学 | Method for enhancing longitudinal mechanical property of wood |
| CN113352418B (en) * | 2021-05-08 | 2022-06-17 | 南京林业大学 | Method for enhancing longitudinal mechanical property of wood |
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| Publication number | Publication date |
|---|---|
| CN110181637B (en) | 2020-11-10 |
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Effective date of registration: 20231222 Address after: 223700 No.139, Fazhan Avenue, high tech Industrial Development Zone, Siyang County, Suqian City, Jiangsu Province Patentee after: Jiangsu nature smart home Co.,Ltd. Address before: Longpan road Xuanwu District of Nanjing city of Jiangsu Province, No. 159 210037 Patentee before: NANJING FORESTRY University |