CN106895664A - A kind of combined drying method of control wood shrinkage - Google Patents
A kind of combined drying method of control wood shrinkage Download PDFInfo
- Publication number
- CN106895664A CN106895664A CN201710099915.6A CN201710099915A CN106895664A CN 106895664 A CN106895664 A CN 106895664A CN 201710099915 A CN201710099915 A CN 201710099915A CN 106895664 A CN106895664 A CN 106895664A
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- Prior art keywords
- timber
- temperature
- pressure
- drying
- shrinkage
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Links
- 238000001035 drying Methods 0.000 title claims abstract description 56
- 239000002023 wood Substances 0.000 title claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000012530 fluid Substances 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims description 18
- 238000001816 cooling Methods 0.000 claims description 10
- 238000005516 engineering process Methods 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000008034 disappearance Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 10
- 239000007787 solid Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 206010054949 Metaplasia Diseases 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000015689 metaplastic ossification Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
-
- 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
- F26B2210/16—Wood, e.g. lumber, timber
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Drying Of Solid Materials (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The present invention proposes a kind of combined drying method of control wood shrinkage, and it is comprised the following steps：The timber that shrinkage will be also easy to produce is processed into the plate square bar of thickness 15mm 30mm, and routinely kiln drying mode is fitly loaded into kiln drying equipment；CO is injected to kiln drying equipment by unicom pipeline2, and with 35 DEG C of speed intensifications per hour, it is finally reached critical condition；Free water becomes supercritical fluid when supercriticality, and timber has been expelled the Free water in lumen under role of supercritical fluid and maintained original form of cell, is realized the drying of wood and is also ensured that cell shrinkage cannot be produced；When timber reaches regulation moisture content, keep critical-temperature constant, CO is slowly released by relief valve2Put to normal pressure；Timber is dried in conventional kiln drying (kd) mode then.The present invention innovatively uses supercritical CO2With conventional kiln drying (kd) integrated programme, shipment, the stacking of whole drying process material are reduced, the time-consuming, energy and improve the efficiency of technique and equipment.
Description
Technical field
The invention belongs to drying of wood processing technique field, and in particular to be it is a kind of control wood shrinkage combined drying
Method.
Background technology
Since China implements natural protection engineering, domestic high-quality natural timber is fewer and feweri, and with China's warp
The continuous improvement of Ji high speed development and living standards of the people, national economy is also increasing to the demand of timber, though Imported timber
Of short duration can so alleviate and use material pressure, but developing for state-owned artificial fast-growing forest timber will be as only way in the future.
Artificial fast-growing woods is mostly used in low value-added papermaking and wood-based panel industry at present, and it should be valuable as solid wood
Value is not not fully exerted.To find out its cause, be that artificial fast-growing woods has some defects of its own, wherein influenceing it as solid wood
The most basic reason of furniture, floor and handicraft material is this kind of timber to be easily deformed in drying process, ftractures, the most sternly
The problem of weight is " shrinkage " caused by drying, and timber is deformed and its serious, it is impossible to be applied to wooden furniture, floor, handicraft
And on indoor and outdoor decoration.Additionally, in addition to artificial fast-growing woods, more also other natural timbers can also dry " shrinkage " and ask
Topic, has a strong impact on the utilization of this kind of high-quality timber.
It is both domestic and external also early to have research for timber " shrinkage " problem, but up to the present do not prevent wood effectively also
The method of material Drying Collapse.Conventional and current technology means include freezing, vacuum, steam pre-treatment and conventional drying middle and later periods
Gas steaming treatment can only all be alleviated or reduce shrinkage, no fundamentally to solve the problems, such as wood shrinkage, and then cannot be applied to easily wrinkle
In the drying of contracting timber, this kind of timber is set also to be realized in the application of solid wood productses and high value added product.
The content of the invention
To overcome defect present in prior art, the present invention to utilize supercritical CO2And conventional kiln drying (kd) combined drying method
To process simultaneously desiccated wood, the generation of effective control wood shrinkage in drying process is realized, its particular technique content is as follows：
A kind of combined drying method of control wood shrinkage, it is comprised the following steps：
S01, timber prepares and loads
The timber that shrinkage will be also easy to produce is processed into the plate square bar of thickness 15mm-30mm, and routinely kiln drying mode is fitly filled
It is downloaded in kiln drying equipment, loading finishes rear pass hull closure hermatic door；
S02, liquid CO2Heat up and timber preheating
Open CO2Steel cylinder pressure-reducing valve, is injected into kiln drying equipment by unicom pipeline, and it is added by thermostat
Heat monitoring, with 3-5 DEG C of speed intensification per hour；Liquid CO2Beginning gradually expands, and pressure reaches critical pressure 7.39MPa first,
Continue to heat up and by discharging a small amount of CO2To keep pressure constant, previously selected critical condition is finally reached, described is critical
State is：31.26-50 DEG C of temperature, pressure 7.39-25MPa；
S03, timber supercritical CO2Dry
Critical condition is maintained, the Free water water in timber space is completely converted into intermediary liquid；And it is big in temperature, pressure
When critical condition, that is, when reaching supercriticality, the interface of air-liquid two disappears, and Free water becomes supercritical fluid, and vapour-liquid is practised physiognomy
Disappearance causes surface tension not exist, and does not exist capillary additonal pressure in wood cell, and order produces the condition of wood shrinkage
It is destroyed；Timber has been expelled the Free water in lumen under role of supercritical fluid and has maintained original form of cell, real
The drying of wood is showed and has also ensured that cell shrinkage cannot be produced；
S04, pressure release cooling
When timber reaches regulation moisture content, i.e., when moisture content is less than or equal to 30%, keep critical-temperature constant, pass through
Relief valve slowly releases CO2Put to normal pressure；
S05, conventional kiln drying (kd)
There is no Free water below fibre saturation point, this stage open heat, make timber in existing temperature after
Temperature of continuing rising is dried, and concrete technology is：During moisture content 20%-30%, 50-55 DEG C of temperature, humidity 60-65%；Moisture content 15%-
When 20%, 55-60 DEG C of temperature, humidity 55-60%；During moisture content 10%-15%, 60-70 DEG C of temperature, humidity 50-55%；
S06, timber cooling unloading
Stop heating, start in blower fan holding equipment air circulation to reduce Wood temperature；
When timber is down to 40 DEG C or so, stop blower fan, natural cooling makes material temperature drop to room temperature, unloading wood for 3 to 5 hours
Material.
The beneficial effects of the invention are as follows：Supercritical CO is carried out by timber2Dry to eliminate timber because being dehydrated and drying
And the problem of collapse for producing, specifically drying is carried out in two stages, timber is in high-moisture percentage fibre saturated point (FSP) with enterprising
Row supercritical CO2Dry, at supercritical conditions, timber liquid surface tension force during dehydration is almost nil, eliminates
Due to wood cell shrinkage caused by surface tension；Moisture content be less than fibre saturated point (FSP) when, using conventional kiln drying (kd) come
Realize pucker-free rapid draing.It is achieved in advantages below：
1) first supercritical processing is carried out to timber, makes wood internal Free water be completely reformed into facing under critical-temperature and pressure
Boundary's liquid, has expelled the Free water in lumen, and then realize the drying of wood under role of supercritical fluid.
2) when temperature is more than critical-temperature and pressure, gas-liquid face disappears wood internal Free water, and the surface tension of water disappears
Lose, there is no capillary surface tension force, make wood cell produce the primary condition of shrinkage to be destroyed.
3) by supercritical CO2After drying the primary condition for eliminating wood shrinkage, in subsequent fiber saturation point (FSP) below
Carry out equally being avoided that Drying Collapse during conventional kiln drying (kd), realize that whole drying process pucker-free occurs.
4) supercritical CO is innovatively used2With conventional kiln drying (kd) integrated programme, reduce whole drying process material shipment,
Stacking, the time-consuming, energy and improves the efficiency of technique and equipment.
5) supercritical CO of first stage2Drying improves the permeability of timber, is wood after follow-up conventional kiln drying (kd) and drying
The modification such as the anti-corrosion of material, fire-retardant provides beneficial conditions.
Specific embodiment
Application scheme is further described as follows：
A kind of combined drying method of control wood shrinkage, it is comprised the following steps：
S01, timber prepares and loads
The timber that shrinkage will be also easy to produce is processed into the plate square bar of thickness 15mm-30mm, and routinely kiln drying mode is fitly filled
It is downloaded in kiln drying equipment, loading finishes rear pass hull closure hermatic door；
S02, liquid CO2Heat up and timber preheating
Open CO2Steel cylinder pressure-reducing valve, is injected into kiln drying equipment by unicom pipeline, and it is added by thermostat
Heat monitoring, with 3-5 DEG C of speed intensification per hour；Liquid CO2Beginning gradually expands, and pressure reaches critical pressure 7.39MPa first,
Continue to heat up and by discharging a small amount of CO2To keep pressure constant, previously selected critical condition is finally reached, described is critical
State is：31.26-50 DEG C of temperature, pressure 7.39-25MPa；
S03, timber supercritical CO2Dry
Critical condition is maintained, the Free water water in timber space is completely converted into intermediary liquid；And it is big in temperature, pressure
When critical condition, that is, when reaching supercriticality, the interface of air-liquid two disappears, and Free water becomes supercritical fluid, and vapour-liquid is practised physiognomy
Disappearance causes surface tension not exist, and does not exist capillary additonal pressure in wood cell, and order produces the condition of wood shrinkage
It is destroyed；Timber has been expelled the Free water in lumen under role of supercritical fluid and has maintained original form of cell, real
The drying of wood is showed and has also ensured that cell shrinkage cannot be produced；
S04, pressure release cooling
When timber reaches regulation moisture content, i.e., when moisture content is less than or equal to 30%, keep critical-temperature constant, pass through
Relief valve slowly releases CO2Put to normal pressure；
S05, conventional kiln drying (kd)
There is no Free water below fibre saturation point, this stage open heat, make timber in existing temperature after
Temperature of continuing rising is dried, and concrete technology is：During moisture content 20%-30%, 50-55 DEG C of temperature, humidity 60-65%；Moisture content 15%-
When 20%, 55-60 DEG C of temperature, humidity 55-60%；During moisture content 10%-15%, 60-70 DEG C of temperature, humidity 50-55%；
S06, timber cooling unloading
Stop heating, start in blower fan holding equipment air circulation to reduce Wood temperature；
When timber is down to 40 DEG C or so, stop blower fan, natural cooling makes material temperature drop to room temperature, unloading wood for 3 to 5 hours
Material.
The present invention innovatively uses supercritical CO2With conventional kiln drying (kd) integrated programme, whole drying process material is reduced
Shipment, stacking, the time-consuming, energy and improve the efficiency of technique and equipment；Thus method can draw implementation aforesaid operations
Supercritical CO2- kiln drying equipment, its include with conventional kiln drying (kd) equipment identical main body, and main body inner chamber pass through cross over pipe
Road connects CO2Steel cylinder, is additionally provided with pressure relief mechanism and is used to discharge CO2To control the air pressure of body lumen；Also popped one's head in including moisturt register,
For being monitored to timber epidemic disaster；And fan assembly, for blowing cooling to the timber in body lumen；CO2Steel
The control cabinet of bottle pressure-reducing valve, pressure relief mechanism and the controlled control equipment of fan assembly.By the overcritical of the inventive method application implementation
CO2- kiln drying equipment is integrated equipment, reduces enterprise investment and equipment cost, and can meet enterprise to shrinkage timber work
The demand that industry metaplasia is produced.
It is that above-mentioned preferred embodiment should be regarded as application scheme implementation method for example, all with application scheme thunder
Technology deduction that is same, approximately or based on this making, replacement, improvement etc., are regarded as the protection domain of this patent.
Claims (1)
1. it is a kind of control wood shrinkage combined drying method, it is characterised in that comprise the following steps：
S01, timber prepares and loads
The timber that shrinkage will be also easy to produce is processed into the plate square bar of thickness 15mm-30mm, and routinely kiln drying mode is fitly loaded into
In kiln drying equipment, loading finishes rear pass hull closure hermatic door；
S02, liquid CO2Heat up and timber preheating
Open CO2Steel cylinder pressure-reducing valve, is injected into kiln drying equipment by unicom pipeline, and carries out heating prison to it by thermostat
Control, with 3-5 DEG C of speed intensification per hour；Liquid CO2Beginning gradually expands, when pressure reaches critical pressure 7.39MPa first, after
Temperature of continuing rising and by discharging a small amount of CO2To keep pressure constant, previously selected critical condition, described critical shape are finally reached
State is：31.26-50 DEG C of temperature, pressure 7.39-25MPa；
S03, timber supercritical CO2Dry
Critical condition is maintained, the Free water water in timber space is completely converted into intermediary liquid；And be more than and face in temperature, pressure
During boundary's state, that is, when reaching supercriticality, the interface of air-liquid two is disappeared, and Free water becomes supercritical fluid, and vapour-liquid is practised physiognomy disappearance
Cause surface tension not exist, do not exist capillary additonal pressure in wood cell, order produces the condition of wood shrinkage to be broken
It is bad；Timber has been expelled the Free water in lumen under role of supercritical fluid and has maintained original form of cell, is realized
The drying of wood also ensures that cell shrinkage cannot be produced；
S04, pressure release cooling
When timber reaches regulation moisture content, i.e., when moisture content is less than or equal to 30%, keep critical-temperature constant, by pressure release
Valve slowly releases CO2Put to normal pressure；
S05, conventional kiln drying (kd)
There is no Free water below fibre saturation point, opened in this stage and heated, make timber continue to rise in existing temperature
Temperature is dried, and concrete technology is：During moisture content 20%-30%, 50-55 DEG C of temperature, humidity 60-65%；During moisture content 15%-20%, temperature
55-60 DEG C, humidity 55-60%；During moisture content 10%-15%, 60-70 DEG C of temperature, humidity 50-55%；
S06, timber cooling unloading
Stop heating, start in blower fan holding equipment air circulation to reduce Wood temperature；
When timber is down to 40 DEG C or so, stop blower fan, natural cooling makes material temperature drop to room temperature for 3 to 5 hours, unloads timber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710099915.6A CN106895664B (en) | 2017-02-23 | 2017-02-23 | A kind of combined drying method controlling wood shrinkage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710099915.6A CN106895664B (en) | 2017-02-23 | 2017-02-23 | A kind of combined drying method controlling wood shrinkage |
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| Publication Number | Publication Date |
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| CN106895664A true CN106895664A (en) | 2017-06-27 |
| CN106895664B CN106895664B (en) | 2019-06-11 |
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| CN201710099915.6A Active CN106895664B (en) | 2017-02-23 | 2017-02-23 | A kind of combined drying method controlling wood shrinkage |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108224924A (en) * | 2017-12-29 | 2018-06-29 | 北京典藏雅居古典家具有限公司 | A kind of dryness finalization device and its finalizing drying method |
| CN110843060A (en) * | 2019-12-26 | 2020-02-28 | 南京林业大学 | By using supercritical CO2Apparatus and method for improving wood permeability |
| CN111558976A (en) * | 2020-04-21 | 2020-08-21 | 广西贺州恒达板业股份有限公司 | Eucalyptus wood door stem material water content regulation and control technology |
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| US9062210B2 (en) * | 2011-07-20 | 2015-06-23 | Empire Technology Development Llc | Compositions and methods for making glass fortified wood |
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2017
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|---|---|---|---|---|
| US9062210B2 (en) * | 2011-07-20 | 2015-06-23 | Empire Technology Development Llc | Compositions and methods for making glass fortified wood |
| CN106182249A (en) * | 2016-07-13 | 2016-12-07 | 张静 | A kind of preparation method of the crack resistence high-intensity wood that sterilizes |
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| Title |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108224924A (en) * | 2017-12-29 | 2018-06-29 | 北京典藏雅居古典家具有限公司 | A kind of dryness finalization device and its finalizing drying method |
| CN108224924B (en) * | 2017-12-29 | 2020-03-27 | 北京典藏雅居古典家具有限公司 | Drying and shaping device and shaping and drying method thereof |
| CN110843060A (en) * | 2019-12-26 | 2020-02-28 | 南京林业大学 | By using supercritical CO2Apparatus and method for improving wood permeability |
| CN111558976A (en) * | 2020-04-21 | 2020-08-21 | 广西贺州恒达板业股份有限公司 | Eucalyptus wood door stem material water content regulation and control technology |
| CN111558976B (en) * | 2020-04-21 | 2021-08-10 | 广西壮族自治区林业科学研究院 | Method for regulating and controlling water content of eucalyptus solid wood door stem |
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Denomination of invention: Combined drying method for controlling timber collapse Effective date of registration: 20190704 Granted publication date: 20190611 Pledgee: China Everbright Bank Zhongshan branch Pledgor: Zhongshan Taixing Furniture Co., Ltd. Registration number: 2019440020056 |
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Denomination of invention: A combined drying method for controlling wood shrinkage Effective date of registration: 20200901 Granted publication date: 20190611 Pledgee: China Everbright Bank Zhongshan branch Pledgor: ZHONGSHAN TAIXING FURNITURE Co.,Ltd. Registration number: Y2020980005605 |
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Date of cancellation: 20210817 Granted publication date: 20190611 Pledgee: China Everbright Bank Zhongshan branch Pledgor: ZHONGSHAN TAIXING FURNITURE Co.,Ltd. Registration number: Y2020980005605 |
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Denomination of invention: A combined drying method for controlling wood shrinkage Effective date of registration: 20210824 Granted publication date: 20190611 Pledgee: Science and Technology Branch of Torch Development Zone of Zhongshan Rural Commercial Bank Co.,Ltd. Pledgor: ZHONGSHAN TAIXING FURNITURE Co.,Ltd. Registration number: Y2021980008241 |