CN100344929C - Method and equipment for releasing internal stress through drying wood - Google Patents
Method and equipment for releasing internal stress through drying wood Download PDFInfo
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- CN100344929C CN100344929C CNB031284507A CN03128450A CN100344929C CN 100344929 C CN100344929 C CN 100344929C CN B031284507 A CNB031284507 A CN B031284507A CN 03128450 A CN03128450 A CN 03128450A CN 100344929 C CN100344929 C CN 100344929C
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Abstract
The present invention relates to a method and an apparatus for releasing the internal stress through drying wood, wherein the method for releasing the internal stress through drying wood comprises the following steps: a high frequency/ microwave generator is arranged in a wood drying kiln at first; a plurality of electrically conductive metal plates are vertically arranged at intervals in the wood stack; the high frequency/ microwave generator is started within the range of the set moisture content; a drying stress detection device is used to determine the drying stress, and handling time is determined; when the determined drying stress reaches a predetermined value, the high frequency/ microwave generator is closed. During the course of carrying out the drying process, when the drying stress is needed to be released, the high frequency/ microwave generator is started to begin to release the drying stress. Time for releasing the drying stress can be determined according to the determined value of the drying stress at that time. The present invention effectively overcomes the defects in the prior art, and the processed wood stress index can be lowered to 1 % or less from more than 10 %. The present invention has the advantages of improving the wood drying speed, lowering the energy consumption and reducing the drying defects.
Description
Technical field
The present invention relates to drying of wood field, particularly a kind of wood drying stress method for releasing and releasing device thereof.
Background technology
At present, in the dry run of timber, the delivery mode of its drying stress normally by jetting saturated steam in wood drying kiln, is implemented the hot wet process to timber, to discharge drying stress, reaches the raising rate of drying, guarantees the purpose of dry mass.
In timber drying, in order to improve the speed of the drying of wood, add moisture content deviation and moisture gradient in the summer wood, but when the moisture gradient in the timber increases, drying stress in the timber also strengthens thereupon, and the possibility that cracking takes place timber is also strengthening.Therefore, in order to guarantee the dry mass of timber, in the process of implementing the drying of wood, all in time spray to steam and handle, to reduce drying stress, the prevention cracking to timber.In the effect difference that different dryer section spray steamings is handled, it mainly is to improve temperature that processing is steamed in dry initial stage spray, makes the even heat penetration of timber, thereby guarantees its rate of drying and dry mass.When moisture content is reduced to fibre saturated point, be the moment of timber generation stress and transformation for stress in dry mid-term, spray this moment to steam to handle to make the wood surface moisture absorption, reduces the moisture gradient of timber table heart layer, relaxes internal stress, prevents that timber from ftractureing.Behind dry the end timber being sprayed the steaming processing is in order to eliminate the moisture content difference between residual stress and the balance sheet material.The time that this traditional processing mode needs is long, often, energy consumption is big, there are a lot of defectives in weak effect, and deal with improperly and can cause sapstain.
The inventor is for being engaged in the production designer of timber processing for many years, at present manufacturer's the trend and the defective of trend and above-mentioned known technology, and then invent out a kind of wood drying stress method for releasing and releasing device thereof, to improve above-mentioned all defect.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of wood drying stress method for releasing and utilizes the releasing device of this method, can overcome defective of the prior art effectively, improves drying of wood speed, cuts down the consumption of energy, and reduces seasoning defect drying defect.
For this reason, one aspect of the present invention is a kind of wood drying stress method for releasing, and it may further comprise the steps:
Step 1 is for to be provided with high frequency or microwave generator outside wood drying kiln, the output of described high frequency or microwave generator runs through drying of wood locular wall;
Step 2 is arranged on plural number between the timber for the material stack height direction along timber with opening the conductive metal sheet devices spaced apart, and described metallic plate is connected with described high frequency or microwave generator;
Step 3 is to start high frequency or microwave generator in the moisture content scope of setting;
Step 4 is determined the processing time for utilizing drying stress detection means measure drying stress;
Step 5 is the drying stress measured when reaching a predetermined value, closes high frequency or microwave generator.
Aforesaid wood drying stress method for releasing, wherein: the power of high frequency described in the step 1 or microwave generator is 30kw, the operating frequency of described radio-frequency generator is frequency electromagnetic waves 11-20MHZ, and the operating frequency of described microwave generator is 915 or 2145MHz.
Aforesaid wood drying stress method for releasing, wherein: be spaced apart 0.8 to 1.2 meter between the conductive metal sheet of each described in the step 2, be preferably 1 meter.
Aforesaid wood drying stress method for releasing, wherein: the moisture content scope can be an above scope among 30%-35%, 20%-25% or the 10-15% in the step 3.
Aforesaid wood drying stress method for releasing, wherein: the processing time in the step 4 can be set at per 10 millimeters lumber thicknesses and handle 0.5 to 3 minute, is preferably 1 minute.
Aforesaid wood drying stress method for releasing, wherein: the power of high frequency described in the step 1 or microwave generator is 30kw, the operating frequency of radio-frequency generator is frequency electromagnetic waves 11-20MHz, and the operating frequency of described microwave generator is 915 or 2145MHz; Be spaced apart 0.8 to 1.2 between described in the step 2 each conductive metal sheet, be preferably 1 meter; In the step 3 the moisture content scope can be 30%-35%, 20%-25% or 10-15% one of them; Processing time in the step 4 can be set at per 10 millimeters lumber thicknesses and handle 0.5 to 3 minute, is in particular 1 minute.
Another aspect of the present invention is the wood drying stress releasing device that utilizes this wood drying stress method for releasing, wherein: described wood drying kiln is provided with a high frequency or microwave generator outward, the indoor plural number that is disposed between the timber in the material stack height direction along timber is opened conductive metal sheet, the output of described high frequency or microwave generator runs through drying of wood locular wall, connects conductive metal sheet by waveguide; One drying stress checkout gear is connected with described timber.
Aforesaid wood drying stress releasing device, wherein: heater is set above wood drying kiln; At the top of wood drying kiln into steam drain is set; Another sidewall of wood drying kiln is provided with the gate for the timber turnover.
Principle of the present invention is, in lumber kiln, the heating by heater makes the water evaporates in the timber, desiccated wood, and its heating is from outward appearance to inner essence, non-homogeneous being heated.Therefore, when the moisture content in the drying of wood reaches certain value, principle by high frequency or heating using microwave timber, regulate moisture content, heat takes place with resin and hydrone in the hyperfrequency concussion timber in high frequency or microwave in inside, the moisture content of timber inside is shifted to the outside, reduce the moisture gradient of timber table heart layer, relax internal stress, prevent that timber from the purpose of cracking taking place thereby reach.
The present invention's characteristics and advantage compared with prior art is: according to the principle of high frequency or heating using microwave timber, utilize high frequency or microwave treatment to replace hot wet process, separate slow drying of wood stress effectively.High frequency or microwave are a kind of energy rather than form of heat, but energy can be converted into heat energy in moisture timber, in the process of high frequency or microwave treatment timber, do not have other heat wastes and hear rate except that timber, so energy consumes low.The more known steaming by spray handled the effective purpose that the method speed that discharges drying stress is fast, discharge drying stress, overcome known technology and produce defectives such as sapstain when discharging stress.Utilize the appliance arrangement of this wood drying stress method for releasing simple in addition, get final product at the indoor increase high frequency of the common drying of wood or microwave generator and common conductive plate, and simple to operate, be easy to realize.
Description of drawings
Fig. 1 is a wood drying stress method for releasing step schematic diagram of the present invention;
Fig. 2 is the device schematic diagram that utilizes wood drying stress method for releasing of the present invention.
The specific embodiment
See also Fig. 1, wood drying stress method for releasing of the present invention comprises:
Step 1: high frequency or microwave generator are set at wood drying kiln;
Step 2: the material stack height direction along timber is arranged on plural number between the timber with opening the conductive metal sheet devices spaced apart;
Step 3: in the moisture content scope of setting, start high frequency or microwave generator;
Step 4: utilize drying stress detection means measure drying stress, determine the processing time;
Step 5: when the drying stress of being measured reaches a predetermined value, close high frequency or microwave generator.
Wherein, the power of high frequency described in the step 1 or microwave generator is 30kw, and the operating frequency of described radio-frequency generator is frequency electromagnetic waves 11-20MHz, the operating frequency employing 915 or the 2145MHz of described microwave generator; Being spaced apart about 0.8-1.2 rice between each conductive metal sheet that the material stack height direction along timber described in the step 2 is provided with at interval is the best with 1 meter distance.
In the above-mentioned steps 3 the moisture content scope roughly can be 30%-35%, 20%-25% or 10-15% one of them, big stress appears in the timber that therefore is dried usually when moisture content is 30%-35%, 20%-25% or 10-15%, therefore, in this moisture content scope, carry out stress release operation effectiveness the best, can determine to discharge the moisture content scope of stress by the drying process that reality adopted according to water content, the kind of the timber that specifically is dried.
Processing time in the above-mentioned steps 4 can be determined the processing time according to the size of the thickness of timber and the drying stress of measuring at that time, and it is 0.05-0.3 minute that the timber of common every millimeter thickness discharges the stress processing time.
The release of drying stress should be used with the drying process coupling, each timber all has a drying process, in the process of carrying out drying process, the tension gauge that is connected with the timber that is dried in the lumber kiln can detect the drying stress (or separated layer water cut) of timber by automatic on-line, and determines to discharge the time of drying stress.Can power be set at described wood drying kiln in the actual production is 30KW, and operating frequency is the high-frequency electromagnetic wave producer of 11-20MHz; Or power is 30KW, and operating frequency is 915 or the microwave generator of 2145MHz, when needs discharge drying stress, then starts this high frequency or microwave generator, begins to discharge drying stress.This high frequency or microwave generator can be to manually start, also can be by being electrically connected with on-line measuring device, after reaching the numerical value of regulation, automatically open high frequency or microwave generator, on the timber that is dried, apply high frequency or microwave electric field, the water content of the balanced timber table heart discharges the internal stress in the timber.Discharge the time of drying stress, can determine according to the measured value of drying stress at that time.The stress index of handling back timber can be reduced to below 1% from more than 10%.
Fig. 2 is a kind of wood drying stress releasing device that uses above-mentioned wood drying stress method for releasing, one high frequency or microwave generator are set, open conductive metal sheet at the plural number that the material stack height direction along timber is disposed between the timber, the output of described high frequency or microwave generator 2 runs through drying of wood locular wall, connects conductive metal sheet 4 by waveguide 5.
Into steam drain 6 is set at the top of wood drying kiln; Heater 7 is set above wood drying kiln; At least one sidewall of wood drying kiln is provided with the gate 8 for the timber turnover.
The adaptability of technology of the present invention is strong, all can implement this technology in that any drying of wood is indoor.As, the processing time: high frequency or microwave treatment are 0.5-3.0min/10mm thickness; And traditional hot wet process is 1-1.5h/mm, energy consumption: 1.2-1.5 unit/mm
2Effect: stress index is from being reduced to below 1% more than 10%.This shows that the present invention has shortened the stress release time greatly when improving dry mass, improved rate of drying, thereby reduced energy consumption.
When the thick birch lumber of dry 32mm, when the moisture content that is dried to timber at 30-35%; 20-25%; Handle 3.0-5.0min with adding high frequency or microwave electric field on the timber respectively during 10-15%, the stress index of handling back timber can be from being reduced to below 1% more than 10%.Compare with traditional hot wet process, reduced energy consumption, shortened the processing time.
Only the above only is a most preferred embodiment of the present invention, and when not limiting scope of the invention process with this, i.e. equivalent variations and the modification of doing according to patent claim of the present invention generally all should still belong within the scope that patent of the present invention contains.
Claims (12)
1, a kind of wood drying stress method for releasing is characterized in that: may further comprise the steps:
Step 1 is for to be provided with high frequency or microwave generator outside wood drying kiln, the output of described high frequency or microwave generator runs through drying of wood locular wall;
Step 2 is arranged on plural number between the timber for the material stack height direction along timber with opening the conductive metal sheet devices spaced apart, and described metallic plate is connected with described high frequency or microwave generator;
Step 3 is to start high frequency or microwave generator in the moisture content scope of setting;
Step 4 is determined the processing time for utilizing drying stress detection means measure drying stress;
Step 5 is the drying stress measured when reaching a predetermined value, closes high frequency or microwave generator.
2, wood drying stress method for releasing as claimed in claim 1, it is characterized in that: the power of high frequency described in the step 1 or microwave generator is 30kw, the operating frequency of radio-frequency generator is frequency electromagnetic waves 11-20MHz, and the operating frequency of microwave generator is 915 or 2145MHz.
3, wood drying stress method for releasing as claimed in claim 1 or 2 is characterized in that: be spaced apart 0.8 to 1.2 meter between the conductive metal sheet of each described in the step 2.
4, wood drying stress method for releasing as claimed in claim 3 is characterized in that: be spaced apart 1 meter between described each conductive metal sheet.
5, wood drying stress method for releasing as claimed in claim 1 or 2 is characterized in that: in the step 3 the moisture content scope be 30%-35%, 20%-25% or 10-15% one of them.
6, wood drying stress method for releasing as claimed in claim 1 or 2 is characterized in that: the processing time in the step 4 is set at per 10 millimeters lumber thicknesses and handled 0.5 to 3 minute.
7, wood drying stress method for releasing as claimed in claim 6 is characterized in that: the described processing time is set at per 10 millimeters lumber thicknesses and handled 1 minute.
8, wood drying stress method for releasing as claimed in claim 1, it is characterized in that: the power of high frequency described in the step 1 or microwave generator is 30kw, the operating frequency of described radio-frequency generator is frequency electromagnetic waves 11-20MHz, and the operating frequency that microwave generator adopts is 915 or 2145MHz; Be spaced apart 0.8 to 1.2 between described in the step 2 each conductive metal sheet; The moisture content scope is one of them among 30%-35%, 20%-25% or the 10-15% in the step 3; Processing time in the step 4 is set at per 10 millimeters lumber thicknesses and handled 0.5 to 3 minute.
9, wood drying stress method for releasing as claimed in claim 8 is characterized in that: the processing time in the described step 4 is set at per 10 millimeters lumber thicknesses and handled 1 minute.
10, wood drying stress method for releasing as claimed in claim 8 is characterized in that: be spaced apart 1 meter between the conductive metal sheet of each described in the step 2.
11, a kind of wood drying stress releasing device that uses the described wood drying stress method for releasing of claim 1, it is characterized in that: described wood drying kiln is provided with a high frequency or microwave generator outward, the indoor plural number that is disposed between the timber in the material stack height direction along timber is opened conductive metal sheet, the output of described high frequency or microwave generator runs through drying of wood locular wall, connects conductive metal sheet by waveguide; One drying stress checkout gear is connected with described timber.
12, wood drying stress releasing device as claimed in claim 11 is characterized in that: heater is set above wood drying kiln; At the top of wood drying kiln into steam drain is set; At least one sidewall of wood drying kiln is provided with the gate for the timber turnover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031284507A CN100344929C (en) | 2003-04-24 | 2003-04-24 | Method and equipment for releasing internal stress through drying wood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031284507A CN100344929C (en) | 2003-04-24 | 2003-04-24 | Method and equipment for releasing internal stress through drying wood |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1540269A CN1540269A (en) | 2004-10-27 |
| CN100344929C true CN100344929C (en) | 2007-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB031284507A Expired - Fee Related CN100344929C (en) | 2003-04-24 | 2003-04-24 | Method and equipment for releasing internal stress through drying wood |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100483054C (en) * | 2006-09-19 | 2009-04-29 | 车炳雷 | Drying machines |
| CN101149370B (en) * | 2007-10-30 | 2010-08-25 | 东北林业大学 | Timber drying stress detection device and method |
| CN103983391A (en) * | 2014-05-20 | 2014-08-13 | 内蒙古农业大学 | Device for measuring air shrinkage force of timber |
| CN105758125A (en) * | 2014-12-17 | 2016-07-13 | 常熟东达红木家具有限公司 | Furniture white wood drying method |
| CN108908605B (en) * | 2018-08-07 | 2020-08-21 | 中国林业科学研究院木材工业研究所 | Drying method of resin-impregnated modified wood |
| CN113119258B (en) * | 2021-04-28 | 2022-03-04 | 福建省祥福工艺有限公司 | Bamboo furniture board stress rapid release treatment process |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1070258A (en) * | 1992-06-18 | 1993-03-24 | 王希 | Electrical system for drying wood |
| JPH10160349A (en) * | 1996-11-28 | 1998-06-19 | Kansai Electric Power Co Inc:The | Timber dryer, timber drying method and electrode for drying timber |
| RU2116588C1 (en) * | 1996-12-26 | 1998-07-27 | Владимир Владимирович Дунаев | Wood drying method and apparatus |
| EP1027567A1 (en) * | 1997-10-30 | 2000-08-16 | Valeur Bois Industrie | Method for drying saw timber and device for implementing said method |
| EP1163481A2 (en) * | 1999-02-22 | 2001-12-19 | Lahden Ammattikorkeakoulu | Method and apparatus for drying and/or thermally treating wood |
-
2003
- 2003-04-24 CN CNB031284507A patent/CN100344929C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1070258A (en) * | 1992-06-18 | 1993-03-24 | 王希 | Electrical system for drying wood |
| JPH10160349A (en) * | 1996-11-28 | 1998-06-19 | Kansai Electric Power Co Inc:The | Timber dryer, timber drying method and electrode for drying timber |
| RU2116588C1 (en) * | 1996-12-26 | 1998-07-27 | Владимир Владимирович Дунаев | Wood drying method and apparatus |
| EP1027567A1 (en) * | 1997-10-30 | 2000-08-16 | Valeur Bois Industrie | Method for drying saw timber and device for implementing said method |
| EP1163481A2 (en) * | 1999-02-22 | 2001-12-19 | Lahden Ammattikorkeakoulu | Method and apparatus for drying and/or thermally treating wood |
Non-Patent Citations (1)
| Title |
|---|
| 桉树木材干燥特性与工艺及其皱缩研究现状 江泽慧，木材工业，第16卷第4期 2002 * |
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| CN1540269A (en) | 2004-10-27 |
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Owner name: LANGFANG HUARI FURNITURE SHARE CO., LTD. Free format text: FORMER OWNER: LUMBER INDUSTRY INST., CHINESE FORESTRY SCIENTIFIC INST. Effective date: 20111208 |
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Free format text: CORRECT: ADDRESS; FROM: 100091 HAIDIAN, BEIJING TO: 065001 LANGFANG, HEBEI PROVINCE |
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Effective date of registration: 20111208 Address after: 065001 Langfang Development Zone, Hebei Patentee after: Langfang Huari Furniture Share Co., Ltd. Address before: 100091 China Forest Academy, Wanshou hill, Beijing Patentee before: Lumber Industry Inst., Chinese Forestry Scientific Inst. |
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Granted publication date: 20071024 Termination date: 20170424 |