CN108344257A - A kind of hot-pressing drying method of cryptomeria timber - Google Patents
A kind of hot-pressing drying method of cryptomeria timber Download PDFInfo
- Publication number
- CN108344257A CN108344257A CN201810048319.XA CN201810048319A CN108344257A CN 108344257 A CN108344257 A CN 108344257A CN 201810048319 A CN201810048319 A CN 201810048319A CN 108344257 A CN108344257 A CN 108344257A
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- China
- Prior art keywords
- cryptomeria
- hot
- timber
- pressing
- drying
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/04—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in presses or clamping devices
-
- 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
- B27K5/007—Treating of wood not provided for in groups B27K1/00, B27K3/00 using pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
-
- 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
Abstract
The present invention relates to wood processing fields, and in particular to a kind of hot-pressing drying method of cryptomeria timber, the specific steps are：The moisture content of cryptomeria timber adjusts, and hot plate is closed heating, hot plate opens and the processes such as post-processing.The present invention can be in a short time by the drying of wood to required moisture content, certain compression can be carried out to cryptomeria timber simultaneously, effectively improve the mechanical property of cryptomeria timber, processing technology simple possible, the process-cycle is short, easy to operate, the drying and enhancing of cryptomeria timber are realized simultaneously, it solves the problems such as cryptomeria mechanical intensity of wood is low and dry, extends the usage of cryptomeria timber, can be used for the fields such as Furniture manufacture and indoor decorating.
Description
Technical field
The present invention relates to a kind of method for drying wood, and in particular to a kind of hot-pressing drying method of cryptomeria timber.
Background technology
Cryptomeria is the main artificial forest seeds in China, and the period of becoming a useful person is short, and accumulation is big.The drying of wood is woodwork processing
In necessary links, timber goes mouldy, changes colour and rotten in order to prevent, while ensureing the mechanical strength of timber, need to be by the drying of wood
To 8~15% moisture content.The method of timber generally use conventional drying at present, conventional drying timber are easy in the drying process
The defects of generation buckling deformation, cracking.Simultaneously because cryptomeria mechanical intensity of wood is low, the method that generally use is modified improves its power
Intensity is learned, being subsequently dried required moisture content could be used.There is document to disclose a kind of adding for improvement cryptomeria wood performance
Work method, this method are to improve cryptomeria performance, first control cryptomeria plank to certain moisture content, then utilize high temperature titanium dioxide
Carbon brings colloidal sol dry powder into plank capillary system and pit system, so as to improve the antibacterial of plank is improved while plank hardness
Antiseptic property.This method is by being added modifying agent, and into timber capillary system, but modifying agent blocks the capillary piping of timber
After system and pit system, the channel blockage that moisture is discharged simultaneously when the drying of timber after treatment makes the dry of timber after processing
Dry to become more difficult, arid cycle increases, and dry mass is difficult to ensure.
Invention content
For the above-mentioned prior art, the present invention provides a kind of hot-pressing drying method of cryptomeria timber, and this method can realize willow
While China fir material rapid draing, its mechanical property is improved.
In order to achieve the above object, the technical solution adopted in the present invention is：A kind of hot-pressing drying of cryptomeria timber is provided
Method, this method include the following steps successively：
（1）Cryptomeria moisture content adjusts：Cryptomeria greenwood plank is subjected to stacking natural drying, moisture content is controlled 25~30%
In range；
（2）Hot-pressing drying：The cryptomeria timber adjusted in step (1) is put into hot press and carries out hot-pressing drying, hot pressing temperature is
160 DEG C~180 DEG C, hot pressing unit pressure is 1~2MPa；
（3）In hot pressing, after pressing plate is often closed heating 0.5h, pressure release makes heating platen open 15min, accelerates wood surface moisture
It is mobile；Stop heating when moisture content reaches 8~15%；
（4）After hot-pressing drying, dried timber is placed on 8~15h of processing in 160~180 DEG C of high temperature and high pressure steams.
The beneficial effects of the invention are as follows：When cryptomeria moisture content is adjusted in 25~30% ranges, moisture content is in fibre
Tie up near saturation point, it is possible to reduce during hot-pressing drying the Inner of timber split, the generation of the drop such as shrinkage etc., when timber contains in greenwood
Water is blunt when tapping into row hot-pressing drying, and since wood cell pars intramuralis has a large amount of moisture, and hot pressing temperature is higher, wooden at this time
The movement of material internal moisture is too fast, may will produce the defects of Inner splits shrinkage.The list of 160 DEG C of hot pressing temperature and 2MPa is used simultaneously
Position pressure, the higher achievable wood internal moisture of one side temperature are fast moved and are evaporated, on the other hand wooden at this temperature
Material has very high plasticity, under the effect of 2MPa unit pressures, can be realized simultaneously the compression of cryptomeria timber, improves the power of timber
Learn intensity.Wood internal generates a large amount of vapor in hot pressing, and by every heating 0.5h, pressure release makes heating platen open
15min can accelerate the evaporation of wood surface moisture and the movement of internal moisture, can shorten arid cycle, while can reduce table
It splits, Inner splits generation with shrinkage.
Based on the above technical solution, the present invention can also be improved as follows：
Further, moisture content is controlled 30% in step (1)；
Further, at 160 DEG C, hot pressing unit pressure is 2MPa for hot pressing temperature control in step (2)；
Further, step (3) center platen is often closed heating 40min, and pressure release makes heating platen open 20min；
Further, dried timber is placed in 160 DEG C of high temperature and high pressure steams in step (4) and handles 12h；
Above-mentioned parameter is preferred parameter, and under its parameter, dry cryptomeria wood drying quality is good, and mechanical property is optimal.
Specific implementation mode
The specific implementation mode of the present invention is described in detail below.
In the embodiment of the present invention, a kind of hot-pressing drying method of cryptomeria timber is provided, the specific steps are：Cryptomeria wood
The moisture content of material adjusts, and hot plate is closed heating and opens the processes such as hot-pressing drying and post-processing.Cryptomeria log is sawed into first
Then the treating selvedge plank of 30~50mm thickness carries out moisture content adjustment to cryptomeria timber, first aqueous at the beginning of the timber both ends sawing two
Rate test piece calculates timber just moisture content after drying.Then the absolute dry mass of just corresponding timber is calculated according to initial aqueous rate, then
Timber is placed in ventilation stacking gas dry-cure.It weighs at regular intervals to timber, until moisture content reaches 25
~30%.Then timber is put into hot press and carries out hot-pressing drying, the temperature of lower hot pressing board is 160 DEG C in setting, unit hot pressing
Pressure is 2MPa, and calculates corresponding meter pressure size, and setting meter pressure size carries out hot-pressing drying.After hot press is closed
40min, releasing pressure makes hot press open and keeps 20min, accelerates the evaporation of wood surface moisture and the movement of internal moisture,
It can make hot-pressing drying cycle time, while can reduce that table is split, Inner splits generation with shrinkage.It is closed 40min according to hot pressing, is opened
The process cycles of 20min, until the moisture content of last timber reaches 10% stopping heating.Finally the timber after hot-pressing drying is put
Enter and carry out high temperature steam treatment in drying box, timber is placed in 160 DEG C of high temperature and high pressure steams and handles 12h, passes through steam treatment, warp
Cross hot pressing treated that the deformation of cryptomeria wood compression is fixed, dimensional stability significantly improves.
The cryptomeria timber dried using the above method, wood drying quality reach standard above grade 2, and arid cycle is more normal
Rule drying is greatly shortened, and the density of timber and case hardness improve.Entire production process realizes the dry of cryptomeria timber simultaneously
It is dry to enhance with compression.
The following examples are only intended to that the present invention will be described in detail, do not limit the range of invention in any way；
（1）Embodiment one
Present embodiment uses 500mm（It is long）×100mm（It is wide）The cryptomeria plank of × 50mm thickness carries out hot-pressing drying processing, tool
Steps are as follows for body：
1. cryptomeria moisture content adjusts：Cryptomeria greenwood plank is subjected to stacking natural drying, moisture content is controlled 30% or so；
2. hot-pressing drying：The cryptomeria timber adjusted in step (1) is subjected to hot-pressing drying, hot pressing temperature is controlled at 160 DEG C, heat
Pressure unit pressure is 2MPa；
3. in hot pressing, after pressing plate is often closed heating 0.5h, pressure release makes heating platen open 15min, accelerates wood surface moisture
It is mobile；Stop heating when moisture content reaches 10%；
4. after hot-pressing drying, dried timber being placed in 160 DEG C of high temperature and high pressure steams and handles 8h；
5. timber end moisture content 10.5% after dry, dry residual stress 1.5%, mechanical property and the specific data of untreated material are as follows
Table：
| Basic density（g/cm3） | Case hardness（N） | |
| The untreated material of cryptomeria | 0.29 | 1150 |
| Cryptomeria hot-pressing drying handles material | 0.38 | 1650 |
（2）Embodiment two
Present embodiment uses 500mm（It is long）×80mm（It is wide）The cryptomeria plank of × 40mm thickness carries out hot-pressing drying processing, specifically
Steps are as follows：
1. cryptomeria moisture content adjusts：Cryptomeria greenwood plank is subjected to stacking natural drying, moisture content is controlled 25% or so；
2. hot-pressing drying：The cryptomeria timber adjusted in step (1) is subjected to hot-pressing drying, hot pressing temperature is controlled at 180 DEG C, heat
Pressure unit pressure is 1.5MPa；
3. in hot pressing, after pressing plate is often closed heating 40min, pressure release makes heating platen open 20min, accelerates wood surface moisture
It is mobile；Stop heating when moisture content reaches 10%；
4. after hot-pressing drying, dried timber being placed in 160 DEG C of high temperature and high pressure steams and handles 10h；
5. timber end moisture content 9.8% after dry, dry residual stress 1.2%, mechanical property and the specific data of untreated material are as follows
Table：
| Basic density（g/cm3） | Case hardness（N） | |
| The untreated material of cryptomeria | 0.29 | 1150 |
| Cryptomeria hot-pressing drying handles material | 0.40 | 1735 |
（3）Embodiment three
Present embodiment uses 500mm（It is long）×100mm（It is wide）The cryptomeria plank of × 30mm thickness carries out hot-pressing drying processing, specifically
Steps are as follows：
1. cryptomeria moisture content adjusts：Cryptomeria greenwood plank is subjected to stacking natural drying, moisture content is controlled 30% or so；
2. hot-pressing drying：The cryptomeria timber adjusted in step (1) is subjected to hot-pressing drying, hot pressing temperature is controlled at 180 DEG C, heat
Pressure unit pressure is 2MPa；
3. in hot pressing, after pressing plate is often closed heating 40min, pressure release makes heating platen open 20min, accelerates wood surface moisture
It is mobile；Stop heating when moisture content reaches 12%；
4. after hot-pressing drying, dried timber being placed in 160 DEG C of high temperature and high pressure steams and handles 8h；
5. timber end moisture content is 12.2% after dry, dry residual stress 1.9%, mechanical property and the specific data of untreated material are such as
Following table：
| Basic density（g/cm3） | Case hardness（N） | |
| The untreated material of cryptomeria | 0.29 | 1150 |
| Cryptomeria hot-pressing drying handles material | 0.41 | 1715 |
Claims (5)
1. a kind of hot-pressing drying method of cryptomeria timber, it is characterized in that including the following steps successively：
（1）The moisture content of cryptomeria timber adjusts：Cryptomeria greenwood plank is subjected to stacking natural drying, moisture content is controlled 25
In~30% range；
（2）The cryptomeria timber adjusted in step (1) is put into hot press and is dried, hot pressing temperature is 160 DEG C, hot pressing list
Position pressure is 2MPa；
（3）In hot pressing, after pressing plate is often closed heating 0.5h, pressure release makes heating platen open 15min, accelerates wood surface moisture
It is mobile；Stop heating when moisture content reaches 8~15%；
（4）Post-processing：After hot-pressing drying, dried timber is placed in 180 DEG C of high temperature and high pressure steams and handles 10h.
2. the hot-pressing drying method of cryptomeria timber according to claim 1, it is characterized in that：Cryptomeria is aqueous in step (1)
Rate controls in 25~30% ranges.
3. the hot-pressing drying method of cryptomeria timber according to claim 1, it is characterized in that：Hot pressing temperature is in step (2)
160 DEG C, hot pressing unit pressure is 2MPa.
4. the hot-pressing drying method of cryptomeria timber according to claim 1, it is characterized in that：After pressing plate is closed heating 0.5h,
Pressure release makes heating platen open 15min.
5. the hot-pressing drying method of cryptomeria timber according to claim 1, it is characterized in that：Processing high temperature is high in step (4)
It is 180 DEG C to press vapor (steam) temperature, processing time 10h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810048319.XA CN108344257A (en) | 2018-01-18 | 2018-01-18 | A kind of hot-pressing drying method of cryptomeria timber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810048319.XA CN108344257A (en) | 2018-01-18 | 2018-01-18 | A kind of hot-pressing drying method of cryptomeria timber |
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| Publication Number | Publication Date |
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| CN108344257A true CN108344257A (en) | 2018-07-31 |
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| CN201810048319.XA Pending CN108344257A (en) | 2018-01-18 | 2018-01-18 | A kind of hot-pressing drying method of cryptomeria timber |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109341198A (en) * | 2018-10-17 | 2019-02-15 | 李韵婷 | Method for drying wood |
| CN110220366A (en) * | 2019-06-03 | 2019-09-10 | 中国林业科学研究院木材工业研究所 | A kind of type of respiration timber wood hot pressing drying process formulating method based on the variation of wood internal steam pressure |
| CN111975889A (en) * | 2020-08-31 | 2020-11-24 | 中国林业科学研究院木材工业研究所 | Wood structure material and preparation method thereof |
| US11498240B2 (en) | 2017-12-29 | 2022-11-15 | Ahf, Llc | Densified wood including process for preparation |
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| CN2328955Y (en) * | 1998-03-06 | 1999-07-14 | 陆仁书 | Exhausted steam intermittent type single board drier |
| CA2547839A1 (en) * | 2003-11-21 | 2005-06-02 | Teknocomp Oy | Method and apparatus for the treatment of wood or wood products |
| CN106272806A (en) * | 2016-09-29 | 2017-01-04 | 阜南县星光工艺品有限公司 | A kind of timber wood hot pressing seasoning |
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| CN2328955Y (en) * | 1998-03-06 | 1999-07-14 | 陆仁书 | Exhausted steam intermittent type single board drier |
| CA2547839A1 (en) * | 2003-11-21 | 2005-06-02 | Teknocomp Oy | Method and apparatus for the treatment of wood or wood products |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11498240B2 (en) | 2017-12-29 | 2022-11-15 | Ahf, Llc | Densified wood including process for preparation |
| US11931917B2 (en) | 2017-12-29 | 2024-03-19 | Ahf, Llc | Densified wood including process for preparation |
| CN109341198A (en) * | 2018-10-17 | 2019-02-15 | 李韵婷 | Method for drying wood |
| CN110220366A (en) * | 2019-06-03 | 2019-09-10 | 中国林业科学研究院木材工业研究所 | A kind of type of respiration timber wood hot pressing drying process formulating method based on the variation of wood internal steam pressure |
| CN110220366B (en) * | 2019-06-03 | 2020-10-02 | 中国林业科学研究院木材工业研究所 | Breathing type wood hot-pressing drying process formulation method based on wood internal steam pressure change |
| CN111975889A (en) * | 2020-08-31 | 2020-11-24 | 中国林业科学研究院木材工业研究所 | Wood structure material and preparation method thereof |
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Address after: 611130 Huimin Road, Wenjiang District, Chengdu, Sichuan Province, No. 211 Applicant after: Sichuan Agricultural University Address before: 625014 No. 46, Xin Kang Road, Yucheng District, Ya'an, Sichuan Applicant before: Sichuan Agricultural University |
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