CN110186757A - A kind of method of timber crack in inhibition drying process - Google Patents
A kind of method of timber crack in inhibition drying process Download PDFInfo
- Publication number
- CN110186757A CN110186757A CN201910432465.7A CN201910432465A CN110186757A CN 110186757 A CN110186757 A CN 110186757A CN 201910432465 A CN201910432465 A CN 201910432465A CN 110186757 A CN110186757 A CN 110186757A
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- Prior art keywords
- drying
- drying process
- generator
- timber
- stress
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- 238000001035 drying Methods 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 39
- 230000005764 inhibitory process Effects 0.000 title abstract description 3
- 239000002023 wood Substances 0.000 claims abstract description 23
- 230000006835 compression Effects 0.000 claims abstract description 18
- 238000007906 compression Methods 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 230000002401 inhibitory effect Effects 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract 1
- 238000005336 cracking Methods 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000116 mitigating effect Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 240000005109 Cryptomeria japonica Species 0.000 description 1
- 244000166124 Eucalyptus globulus Species 0.000 description 1
- 241000238631 Hexapoda Species 0.000 description 1
- 235000005456 Pinus sylvestris var mongolica Nutrition 0.000 description 1
- 241000114025 Pinus sylvestris var. mongolica Species 0.000 description 1
- 240000007313 Tilia cordata Species 0.000 description 1
- 241000607479 Yersinia pestis Species 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/25—Measuring force or stress, in general using wave or particle radiation, e.g. X-rays, microwaves, neutrons
- G01L1/255—Measuring force or stress, in general using wave or particle radiation, e.g. X-rays, microwaves, neutrons using acoustic waves, or acoustic emission
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Acoustics & Sound (AREA)
- Toxicology (AREA)
- Drying Of Solid Materials (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The invention discloses a kind of methods of timber crack in inhibition drying process, comprising the following steps: step 1 installs drying stress detection device in lumber kiln；Step 2 installs compression prestress generator in lumber kiln；Step 3, desiccated wood, and start compression prestress generator within the scope of the drying stress of setting；Step 4 closes compression prestress generator when drying stress is lower than predetermined value.This method inhibits the effect that occurs with to crack in drying process, and wood drying quality is high after processing, and defect is few.
Description
Technical field
The invention belongs to timber processing and drying of wood fields, and in particular to a kind of to inhibit timber crack in drying process
Method.
Background technique
Trees cut down and sawing at log and sawn timber after, need to be dried.By drying, timber is greatly reduced and contains
Water rate.For raising mechanical intensity of wood, improvement timberphysics performance, prevention wood is rotten to go bad and insect pest and mitigation wood for drying
Material measurer is significant.Timber is a kind of natural capillary material, in the drying process, moisture in capillary system into
Row movement, evaporates after being moved to wood surface.Movement speed of the moisture in capillary system far away from surface evaporation speed,
Therefore in the drying process, the moisture content of wood surface is always lower than internal moisture content.Surface and internal moisture content difference
So that timber produces drying stress, this stress often causes the cracking in timber drying.Cracking causes lumber quality
It reduces, influences intensity and subsequent use, substantially reduce timber service life.Therefore, how to prevent timber in drying process from producing
Raw cracking is wood working industry urgent problem to be solved and difficult point.
At this stage, prevent or mitigate the method that timber drying generates cracking and mainly pass through pretreatment (patent of invention " one
The drying means (CN201610834095.6) of kind of timber "), smear a kind of anti-cracking agent (patent of invention " method for drying wood
(CN201710559344.X) "), coat coating (patent of invention " a method of reduce timber drying in drop etc.
The methods of (CN201810650493.1) "), or use special drying mode, including a kind of microwave drying (patent of invention " wood
Material drying method (CN201710627042.1) "), vacuum drying a kind of (patent of invention " method for drying wood
(CN201510800116.8) " a kind of), dry (patent of invention " the linden method for drying wood of intermittent heating
(CN201710849406.0) "), ultrasonic wave is dry (patent of invention " method for drying wood (CN201811209687.4) ").This
A little preventions or mitigation cracking method existed general problem are: increasing the complexity of drying process, increase drying process
Front and back treatment process, extend the process time, increase production cost.
In addition, patent of invention " a kind of Bracking-resistant method of timber (CN201611116544.X) " discloses one kind and is dried under reduced pressure
And the method for impregnating by pressure resin, the cracking rate of timber reduces after processing；Patent of invention " the high-temperature gas of balance moisture content
To stream process timber method (CN200810230064.5) " it discloses after a kind of processing of wood gluing through high-temperature gas to stream process
Method, the cracking rate of timber reduces after processing, but above two method is handled mainly for the timber after drying, for
Timber crack in drying process can not effectively inhibit.
Summary of the invention
The technical problem to be solved by the present invention is to overcome drying process of the existing technology complicated, treatment process is more,
The problem of process time is long, high production cost, emphasis solve the technical issues of timber crack can not effectively inhibit in drying process.
The present invention provides a kind of method for inhibiting timber crack in drying process, in timber drying, real-time detection drying stress
Situation of change, and within the scope of the drying stress of setting to strip width direction implement compression prestress, utilize the prestressing force
Offset the tensile stress in drying process.Effectively inhibit the generation of timber crack as a result,.
In order to solve the above technical problems, the present invention provides a kind of method for inhibiting timber crack in drying process, feature
It is, comprising the following steps:
Step 1 installs drying stress detection device in lumber kiln；
Step 2 installs compression prestress generator in lumber kiln；
Step 3, desiccated wood, and start compression prestress generator within the scope of the drying stress of setting；
Step 4 closes compression prestress generator when drying stress is lower than predetermined value.
Preferably, in step 1, the drying stress detection device is contact strain meter and corresponding resistance-strain
Any one of instrument, high-temp resisting high-humidity resisting degree tensile stress sensor or sound emission drying stress detector.
Preferably, in step 2, the compression prestress generator is mechanical force stretcher, and compressing force can be maintained permanent
It is fixed, working environment are as follows: 40 DEG C~100 DEG C of temperature, relative humidity 5%RH~90%RH.
Preferably, in step 2, the mechanical force range of the compression prestress generator is 1N~100N, and precision is
0.1N~1N.
Preferably, in step 3, the density of the wood material species is lower than 0.6g/cm3。
Preferably, in step 3, the drying stress lower limit is common slot dimensions multiplied by tensile strength perpendicular to grain
50%, the upper limit is common slot dimensions multiplied by the 120% of tensile strength perpendicular to grain.
Preferably, in step 4, the predetermined value be common slot dimensions multiplied by tensile strength perpendicular to grain 40%~
50%.
Compared with the prior art, the advantages of the present invention are as follows:
(1) this method is easy to operate, only adds drying stress detection device processed and compression prestress generator in dry kiln
It is standby, and may be implemented to automate.
(2) this method inhibits the effect that occurs with to crack in drying process, and wood drying quality is high after processing, lacks
It falls into few.
(3) this method can check the stress in drying process in real time, thus the real-time suppression to realizing to cracking
System.
(4) this method accelerates the release of drying stress, and shortens the conditioning time of timber after drying.
Detailed description of the invention
Fig. 1 is prestress application direction schematic diagram.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
Embodiment 1:
Step 1 installs contact strain meter and corresponding resistance strain gauge in lumber kiln；
Step 2: mechanical force is installed in lumber kiln and is tensioned prestressing force generator, temperature range is 40 DEG C~90
DEG C, relative humidity 5%RH~90%RH；
Step 3: dry pinus sylvestris var. mongolica timber, timber size are 1000mm × 200mm × 5mm, set drying stress range as
2N~4N；
Step 4: when drying stress is lower than 2N, compression prestress generator is closed；
Embodiment 2:
Step 1 installs high-temp resisting high-humidity resisting degree tensile stress sensor in lumber kiln；
Step 2: mechanical force is installed in lumber kiln and is tensioned prestressing force generator, temperature range is 40 DEG C~90
DEG C, relative humidity 5%RH~90%RH；
Step 3: dry Eucalyptus Wood, timber size are 2000mm × 300mm × 10mm, set drying stress range as
6N~10N；
Step 4: when drying stress is lower than 6N, compression prestress generator is closed；
Embodiment 3:
Step 1 installs sound emission drying stress detector in lumber kiln；
Step 2: mechanical force is installed in lumber kiln and is tensioned prestressing force generator, temperature range is 50 DEG C~85
DEG C, relative humidity 10%RH~85%RH；
Step 3: dry cryptomeria timber, timber size are 2000mm × 250mm × 50mm, set drying stress range as
10N~20N；
Step 4: when drying stress is lower than 10N, compression prestress generator is closed；
To the test specimen being dried according to above three embodiments and comparative example (common wood without any processing) into
Row test, test result is as follows table 1.
1 wood drying quality index of table
Consolidated statement 1 is analyzed, and the timber handled using the method for the present invention is compared with comparison material, and cracking degree obviously drops
It is low.
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 (7)
1. a kind of method for inhibiting timber crack in drying process, characterized in that the following steps are included:
Step 1 installs drying stress detection device in lumber kiln；
Step 2 installs compression prestress generator in lumber kiln；
Step 3, desiccated wood, and start compression prestress generator within the scope of the drying stress of setting；
Step 4 closes compression prestress generator when drying stress is lower than predetermined value.
2. a kind of method for inhibiting timber crack in drying process according to claim 1, characterized in that in step 1,
The drying stress detection device is that contact strain meter and corresponding resistance strain gauge, high-temp resisting high-humidity resisting degree tensile stress pass
Any one of sensor or sound emission drying stress detector.
3. a kind of method for inhibiting timber crack in drying process according to claim 1, characterized in that in step 2,
The compression prestress generator is mechanical force stretcher, and compressing force can be maintained constant, working environment are as follows: 40 DEG C of temperature
~ 100 DEG C, relative humidity 5%RH ~ 90%RH.
4. a kind of method for inhibiting timber crack in drying process according to claim 1, characterized in that in step 2,
The mechanical force range of the compression prestress generator is 1N ~ 100N, and precision is 0.1N ~ 1N.
5. a kind of method for inhibiting timber crack in drying process according to claim 1, characterized in that in step 3,
The density of the wood material species is lower than 0.6g/cm3。
6. a kind of method for inhibiting timber crack in drying process according to claim 1, characterized in that in step 3,
The drying stress lower limit is common slot dimensions multiplied by the 50% of tensile strength perpendicular to grain, the upper limit be common slot dimensions multiplied by
The 120% of tensile strength perpendicular to grain.
7. a kind of method for inhibiting timber crack in drying process according to claim 1, characterized in that in step 4,
The predetermined value is common slot dimensions multiplied by the 40% ~ 50% of tensile strength perpendicular to grain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910432465.7A CN110186757B (en) | 2019-05-23 | 2019-05-23 | Method for inhibiting wood cracking in drying process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910432465.7A CN110186757B (en) | 2019-05-23 | 2019-05-23 | Method for inhibiting wood cracking in drying process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110186757A true CN110186757A (en) | 2019-08-30 |
| CN110186757B CN110186757B (en) | 2021-11-05 |
Family
ID=67717500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910432465.7A Active CN110186757B (en) | 2019-05-23 | 2019-05-23 | Method for inhibiting wood cracking in drying process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110186757B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111347509A (en) * | 2020-04-22 | 2020-06-30 | 连营营 | Heating drying method for preventing wood from cracking |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102554990A (en) * | 2012-01-20 | 2012-07-11 | 汕头市宜华家具有限公司 | Wood drying method |
-
2019
- 2019-05-23 CN CN201910432465.7A patent/CN110186757B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102554990A (en) * | 2012-01-20 | 2012-07-11 | 汕头市宜华家具有限公司 | Wood drying method |
Non-Patent Citations (4)
| Title |
|---|
| 刘元 等: "西南桦木材干燥特性与干燥方法及其工艺", 《中南林学院学报》 * |
| 张新宇 等: "银腺杨木材干燥特性初步研究", 《林业机械与木工设备》 * |
| 程万里 等: "高温高压蒸汽干燥过程中木材的收缩应力特征", 《北京林业大学学报》 * |
| 郑拓宇: "木材干缩影响因素及减少干燥开裂的方法", 《林业机械与木工设备》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111347509A (en) * | 2020-04-22 | 2020-06-30 | 连营营 | Heating drying method for preventing wood from cracking |
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| Publication number | Publication date |
|---|---|
| CN110186757B (en) | 2021-11-05 |
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| TR01 | Transfer of patent right |
Effective date of registration: 20231228 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 |
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| TR01 | Transfer of patent right |