CN106313240A - Drying treatment method for wood - Google Patents
Drying treatment method for wood Download PDFInfo
- Publication number
- CN106313240A CN106313240A CN201610733337.2A CN201610733337A CN106313240A CN 106313240 A CN106313240 A CN 106313240A CN 201610733337 A CN201610733337 A CN 201610733337A CN 106313240 A CN106313240 A CN 106313240A
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- CN
- China
- Prior art keywords
- timber
- wood
- conducted
- drying
- treatment
- 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.)
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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
- B27K5/003—Treating of wood not provided for in groups B27K1/00, B27K3/00 by using electromagnetic radiation or mechanical waves
-
- 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
- B27K3/34—Organic impregnating agents
- B27K3/50—Mixtures of different organic impregnating agents
-
- 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
-
- 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
Abstract
The invention discloses a drying treatment method for wood. The drying treatment method includes the following steps that firstly, wood treatment is conducted; secondly, magnetic field treatment is conducted; thirdly, ultrasonic treatment is conducted; fourthly, heat insulation and pressure maintaining treatment is conducted; fifthly, vacuum drying is conducted; sixthly, steeping liquid is prepared; seventhly, steeping treatment is conducted; and ninthly, heat insulation and curing treatment is conducted. According to the drying treatment method for the wood, reasonable drying treatment operation is firstly conducted on the wood, so that the cracking rate of the wood is reduced, the drying speed and effect are improved, the relative crystallinity of the wood is improved, and the quality of the wood is improved; and steeping treatment is then conducted so that the wood can be well filled with low-molecular-weight resin, the bonding strength of the wood is improved, durability of the cracking resisting performance, the damp resisting performance and other performance of the wood is improved, and the use value is relatively high.
Description
Technical field
The invention belongs to wood processing technique field, be specifically related to the drying method of a kind of timber.
Background technology
The drying of wood is a highly important operation in the timber course of processing, is the most again to improve timber utilization rate,
Save the important channel of the forest reserves.The dry run of timber is the process of Water In Wood evaporation, due to water various in timber
Divide different with the structural relation of timber, and the physicochemical property of timber different parts is different, causes dry run internal stress
Uneven, be easily generated the phenomenon of cracking, and then have impact on the performance after the drying of wood.Therefore, need in the dry run of timber
Reasonably to control the evaporation process of Water In Wood, on the premise of ensureing dry mass, improve rate of drying as far as possible.
Existing most drying means mostly just controls two conditions of temperature and humidity, utilizes temperature, the gradation of moisture
The moisture of wood internal is evaporated, although mode is simple, but the quality being dried and speed are the most undesirable, not only can be dried
During cracking phenomenon, the moisture resistance of dried finished wood, cracking resistance are the most undesirable, although present oriented dry
The resin characteristic with lifting timber of low-molecular-weight is filled in timber after dry, but the best with timber bond strength because of it, exist
The problems such as performance is the most lasting.
Summary of the invention
In order to solve the problems referred to above, the invention provides the drying method of a kind of timber.
The present invention is achieved through the following technical solutions:
The drying method of a kind of timber, comprises the steps:
(1) treating of wood:
After timber is first cut into by processing request the shape of correspondence more standby after wash away the impurity such as wood flour with clear water；
(2) magnetic field processes:
Putting in the processing instrument of magnetic field by the timber that step (1) is handled well, the magnetic field intensity of applying is 1 ~ 1.2T, persistently process 10 ~
Take out standby after 15min；
(3) ultrasonic Treatment:
Timber after step (2) being processed is put in ultrasonic Treatment instrument, and the frequency controlling ultrasound wave is 60 ~ 63 KHz, continues
Take out standby after processing 15 ~ 20min；Magnetic field is different for the action effect of wood structure with ultrasound wave, and ultrasound wave is placed in magnetic
After the treatment process of field, the effect that magnetic field processes can be promoted, show preferable synergism；
(4) heat-insulation pressure keeping processes:
Timber after step (3) is processed put into temperature be 38 ~ 42 DEG C, air pressure be 2 ~ 2.2MPa environment in, at heat-insulation pressure keeping
Take out standby after reason 10 ~ 15min；Behind magnetic field and ultrasonic Treatment, carry out heat-insulation pressure keeping process, can prevent at above-mentioned two steps
Cause after reason that wood internal stress is excessive, organizational structure is the loosest, degradation problem under tension, flexural strength；
(5) vacuum drying:
Timber after step (4) being processed is put in vacuum drying instrument, is dried process, keep vacuum be-0.08 ~-
0.085MPa, timber water content is dried take out after no more than 10% standby；
(6) prepared by impregnation liquid:
Lauxite and the furfuryl alcohol resin of low-molecular-weight are mixed and made into impregnation liquid by weight 2 ~ 3:1, control consolidating of impregnation liquid
Body content of material is 40 ~ 43%, and pH value is 7.5 ~ 8.0；
(7) impregnation process:
Timber after step (5) dried is put in the impregnation liquid of step (6) gained, while timber pickling, first use
Timber is processed by ultrasound wave, after processing 20 ~ 25min, then processes timber with magnetic field, stops after processing 15 ~ 20min
Only, timber is taken out standby；
(8) heat preservation solidification processes:
After the impregnation liquid erasing of the wood surface after step (7) being processed is clean, then put it in couveuse isothermal holding 4 ~
5h, takes out after its internal resin has solidified.
Further, when step (4) heat-insulation pressure keeping processes, the relative humidity controlling air is 70 ~ 80%.
Further, during step (5) vacuum drying treatment, controlling temperature in vacuum drying instrument is 58 ~ 62 DEG C, and air is relative
Humid control is 50 ~ 60%.
Further, the relative molecular weight of the Lauxite described in step (6) and furfuryl alcohol resin is 350 ~ 450.
Further, the intensity that magnetic field described in step (7) processes is 1 ~ 1.2T, the frequency of ultrasonic Treatment is 60 ~
63KHz is identical with the intensity that step (2), step (3) process respectively.
Further, the holding temperature described in step (8) is 90 ~ 95 DEG C.
There is advantages that
(1) present invention has carried out magnetic field and ultrasonic Treatment before processing the drying of wood, and wherein magnetic field processes and can make thin-walled
On cell and prothenchyma (of wood) wall, pit membrane is damaged, has got through this effective micro-capillary channel of pit cavity, has expanded the stream of moisture
Circulation passage and pipeline, improve follow-up rate of drying；The ultrasonic Treatment applied can act on cell wall and lumen, broken
Being broken part pit membrane, further enhancing its permeability, have strengthening and promote the effect of the action of a magnetic field, both can well change
Kind timber is tangential, contract with dry rate radially and longitudinally, reduces cracking incidence rate, and can improve the relative crystallinity of timber.
(2) Lauxite and furfuryl alcohol resin composition in the impregnation liquid prepared can well fill the lumen of timber with thin
Cell wall, ultrasound wave and magnetic field that period applies process and can guarantee that pit cavity channel opener, and promotes the Lauxite of low-molecular-weight
Immerse with furfuryl alcohol resin, simultaneously it can also be promoted to crosslink with cell wall constituent, improve further the crack resistence of timber with
Humidity resistance.
(3) present invention has first carried out the operation of rational dried to timber, reduces the cracking rate of timber, improves dry
Dry speed and effect, add the relative crystallinity of timber, improves the quality of timber, the impregnation process then carried out, incites somebody to action
The resin of low-molecular-weight is well filled in wood internal, and improves its bond strength, enhance timber decontrol split, moistureproof etc.
The persistency of performance, use value is higher.
Detailed description of the invention
Embodiment 1
The drying method of a kind of timber, comprises the steps:
(1) treating of wood:
After timber is first cut into by processing request the shape of correspondence more standby after wash away the impurity such as wood flour with clear water；
(2) magnetic field processes:
Putting in the processing instrument of magnetic field by the timber that step (1) is handled well, the magnetic field intensity of applying is 1.2T, persistently processes 15min
Rear taking-up is standby；
(3) ultrasonic Treatment:
Timber after step (2) being processed is put in ultrasonic Treatment instrument, and the frequency controlling ultrasound wave is 60 KHz, persistently processes
Take out standby after 20min；
(4) heat-insulation pressure keeping processes:
Timber after step (3) is processed put into temperature be 40 DEG C, air pressure be 2MPa environment in, heat-insulation pressure keeping processes 10min
Rear taking-up is standby；
(5) vacuum drying:
Timber after step (4) being processed is put in vacuum drying instrument, is dried process, and holding vacuum is-0.085MPa,
Timber water content is dried take out after no more than 10% standby；
(6) prepared by impregnation liquid:
Lauxite and the furfuryl alcohol resin of low-molecular-weight are mixed and made into impregnation liquid by weight 2:1, control the solid of impregnation liquid
Content of material is 41%, and pH value is 7.5 ~ 8.0；
(7) impregnation process:
Timber after step (5) dried is put in the impregnation liquid of step (6) gained, while timber pickling, first use
Timber is processed by ultrasound wave, after processing 25min, then processes timber with magnetic field, stops after processing 20min, will
Timber takes out standby；
(8) heat preservation solidification processes:
After the impregnation liquid erasing totally of the wood surface after step (7) being processed, then put it into isothermal holding 4h in couveuse,
Take out after its internal resin has solidified.
Further, when step (4) heat-insulation pressure keeping processes, the relative humidity controlling air is 70 ~ 75%.
Further, during step (5) vacuum drying treatment, controlling temperature in vacuum drying instrument is 59 DEG C, and air is the wettest
Degree control is 53 ~ 55%.
Further, the relative molecular weight of the Lauxite described in step (6) and furfuryl alcohol resin is 380 ~ 420.
Further, the intensity that the magnetic field described in step (7) processes is 1.2T, and the frequency of ultrasonic Treatment is 60KHz,
Identical with the intensity that step (2), step (3) process respectively.
Further, the holding temperature described in step (8) is 93 DEG C.
Comparative example 1
This comparative example 1 compared with Example 1, step (3) ultrasonic Treatment is placed in step (2) magnetic field process before, except this
Outer method step is the most identical.
Comparative example 2
This comparative example 2 compared with Example 1, when step (7) impregnation process, does not apply ultrasonic Treatment, uses at magnetic field
Reason replaces, and i.e. with magnetic field to timber continuous processing 45min, method step in addition is the most identical.
Comparative example 3
This comparative example 3 compared with Example 1, when step (7) impregnation process, does not apply magnetic field and processes, use at ultrasound wave
Reason replaces, and i.e. with ultrasound wave to timber continuous processing 45min, method step in addition is the most identical.
Comparative example 4
This comparative example 4 compared with Example 1, when step (7) impregnation process, does not apply magnetic field and ultrasonic Treatment, often
Rule dipping 45min, method step in addition is the most identical.
Matched group
Processing method filled by the existing drying of wood, resin.
In order to contrast effect of the present invention, select Lignum paulowniae as experimental subject, be dried by above-mentioned six kinds of modes respectively
Processing, following table is corresponding processing, performance comparison data:
| It is dried and adds man-hour Cracking rate (%) | The drying of wood wrinkles The contracting degree of depth (mm) | Knot relatively Crystalline substance degree (%) | Dried Moisture content (%) | After being dried 2 years Moisture content (%) | The most in two years Cracking rate (%) | |
| Implement Example 1 | 1.3 | 0.12 | 65.8 | 6.2 | 11.4 | 5.5 |
| Contrast Implement Example 1 | 2.1 | 0.26 | 63.2 | 6.3 | 12.8 | 6.5 |
| Contrast Implement Example 2 | 1.5 | 0.13 | 60.7 | 6.0 | 14.2 | 7.2 |
| Contrast Implement Example 3 | 1.4 | 0.15 | 61.0 | 5.9 | 14.7 | 7.6 |
| Contrast Implement Example 4 | 1.6 | 0.12 | 58.6 | 6.1 | 17.8 | 8.9 |
| Comparison Group | 4.5 | 0.47 | 54.4 | 6.5 | 20.7 | 10.8 |
As can be seen from the above table, when drying method of the present invention can well reduce the drying of wood and the cracking rate of finished product, with
Time can strengthen again the anti-resurgence energy of timber.
Claims (6)
1. the drying method of a timber, it is characterised in that comprise the steps:
(1) treating of wood:
After timber is first cut into by processing request the shape of correspondence more standby after wash away the impurity such as wood flour with clear water；
(2) magnetic field processes:
Putting in the processing instrument of magnetic field by the timber that step (1) is handled well, the magnetic field intensity of applying is 1 ~ 1.2T, persistently process 10 ~
Take out standby after 15min；
(3) ultrasonic Treatment:
Timber after step (2) being processed is put in ultrasonic Treatment instrument, and the frequency controlling ultrasound wave is 60 ~ 63KHz, persistently locates
Take out standby after reason 15 ~ 20min；
(4) heat-insulation pressure keeping processes:
Timber after step (3) is processed put into temperature be 38 ~ 42 DEG C, air pressure be 2 ~ 2.2MPa environment in, at heat-insulation pressure keeping
Take out standby after reason 10 ~ 15min；
(5) vacuum drying:
Timber after step (4) being processed is put in vacuum drying instrument, is dried process, keep vacuum be-0.08 ~-
0.085MPa, timber water content is dried take out after no more than 10% standby；
(6) prepared by impregnation liquid:
Lauxite and the furfuryl alcohol resin of low-molecular-weight are mixed and made into impregnation liquid by weight 2 ~ 3:1, control consolidating of impregnation liquid
Body content of material is 40 ~ 43%, and pH value is 7.5 ~ 8.0；
(7) impregnation process:
Timber after step (5) dried is put in the impregnation liquid of step (6) gained, while timber pickling, first use
Timber is processed by ultrasound wave, after processing 20 ~ 25min, then processes timber with magnetic field, stops after processing 15 ~ 20min
Only, timber is taken out standby；
(8) heat preservation solidification processes:
After the impregnation liquid erasing of the wood surface after step (7) being processed is clean, then put it in couveuse isothermal holding 4 ~
5h, takes out after its internal resin has solidified.
The drying method of a kind of timber the most according to claim 1, it is characterised in that at step (4) heat-insulation pressure keeping
During reason, the relative humidity controlling air is 70 ~ 80%.
The drying method of a kind of timber the most according to claim 1, it is characterised in that at step (5) vacuum drying
During reason, controlling temperature in vacuum drying instrument is 58 ~ 62 DEG C, and it is 50 ~ 60% that relative air humidity controls.
The drying method of a kind of timber the most according to claim 1, it is characterised in that the urea described in step (6)
The relative molecular weight of urea formaldehyde and furfuryl alcohol resin is 350 ~ 450.
The drying method of a kind of timber the most according to claim 1, it is characterised in that the magnetic described in step (7)
The intensity that field processes is 1 ~ 1.2T, and the frequency of ultrasonic Treatment is 60 ~ 63KHz, strong with what step (2), step (3) processed respectively
Spend identical.
The drying method of a kind of timber the most according to claim 1, it is characterised in that the guarantor described in step (8)
Temperature temperature is 90 ~ 95 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610733337.2A CN106313240A (en) | 2016-08-27 | 2016-08-27 | Drying treatment method for wood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610733337.2A CN106313240A (en) | 2016-08-27 | 2016-08-27 | Drying treatment method for wood |
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| CN106313240A true CN106313240A (en) | 2017-01-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610733337.2A Pending CN106313240A (en) | 2016-08-27 | 2016-08-27 | Drying treatment method for wood |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107415002A (en) * | 2017-07-28 | 2017-12-01 | 阜南县中信柳木工艺品有限公司 | A kind of weather-proof paulownia wood hardening process |
| 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 |
| CN114292680A (en) * | 2021-11-18 | 2022-04-08 | 霍山丰乐生物能源科技有限公司 | Method for preparing biomass particles by using agricultural and forestry wastes |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1139900A (en) * | 1994-10-12 | 1997-01-08 | 中央木材开发株式会社 | Lumber with destroyed pit membranes |
| CN1310663A (en) * | 1998-06-09 | 2001-08-29 | 墨尔本大学 | A method for increasing the permeability of wood |
| CN102303331A (en) * | 2010-12-29 | 2012-01-04 | 北京林业大学 | Drying process for preventing eucalyptus wood shrinkage |
| CN102626941A (en) * | 2011-02-07 | 2012-08-08 | 刘锡丽 | Fast-growing wood surface reinforcing manufacturing method and sections manufactured thereby |
| CN104526803A (en) * | 2014-12-30 | 2015-04-22 | 广州好莱客创意家居股份有限公司 | Surface-impregnated wood and preparing method thereof |
| CN104526804A (en) * | 2014-12-30 | 2015-04-22 | 广州好莱客创意家居股份有限公司 | Manufacturing method for impregnated wood and preparation method for impregnating resin |
-
2016
- 2016-08-27 CN CN201610733337.2A patent/CN106313240A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1139900A (en) * | 1994-10-12 | 1997-01-08 | 中央木材开发株式会社 | Lumber with destroyed pit membranes |
| CN1310663A (en) * | 1998-06-09 | 2001-08-29 | 墨尔本大学 | A method for increasing the permeability of wood |
| CN102303331A (en) * | 2010-12-29 | 2012-01-04 | 北京林业大学 | Drying process for preventing eucalyptus wood shrinkage |
| CN102626941A (en) * | 2011-02-07 | 2012-08-08 | 刘锡丽 | Fast-growing wood surface reinforcing manufacturing method and sections manufactured thereby |
| CN104526803A (en) * | 2014-12-30 | 2015-04-22 | 广州好莱客创意家居股份有限公司 | Surface-impregnated wood and preparing method thereof |
| CN104526804A (en) * | 2014-12-30 | 2015-04-22 | 广州好莱客创意家居股份有限公司 | Manufacturing method for impregnated wood and preparation method for impregnating resin |
Non-Patent Citations (2)
| Title |
|---|
| 何正斌等: "《木材干燥热质传递理论与数值分析》", 31 August 2013 * |
| 李贤军等: "《木材微波真空干燥特性及其热质迁移机理》", 30 November 2009 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107415002A (en) * | 2017-07-28 | 2017-12-01 | 阜南县中信柳木工艺品有限公司 | A kind of weather-proof paulownia wood hardening process |
| 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 |
| CN114292680A (en) * | 2021-11-18 | 2022-04-08 | 霍山丰乐生物能源科技有限公司 | Method for preparing biomass particles by using agricultural and forestry wastes |
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