CN105235040A - Processing method of solid wood floor blanks used for floor heating - Google Patents
Processing method of solid wood floor blanks used for floor heating Download PDFInfo
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Abstract
The invention discloses a processing method of solid wood floor blanks used for floor heating and relates to the field of wood processing. The solid wood floor blanks are placed in a microwave processing device with negative pressure to be processed, and the method includes (1) a heat treatment stage and (2) a humidity regulation processing stage. The heat treatment stage includes a, a heat pretreatment stage, b, a temperature raising stage, c, a high-temperature processing stage, and d, a cooling stage, wherein in the heat pretreatment stage, pressure is 0.02-0.05 MPa, the surface temperature of the floor blanks is 50-80 DEG C, and processing time is 3-5 hours; in the temperature raising stage, pressure is 0.05-0.09 MPa, the surface temperature of the floor blanks is 110-130 DEG C, and processing time is 1-3 hours; in the high-temperature processing stage, pressure is 0.07-0.1 MPa, the surface temperature of the floor blanks is 150-180 DEG C, and processing time is 2-5 hours; and in the cooling stage, pressure is 0.1 MPa, ventilation is performed for cooling, and the surface temperature of the floor blanks is lowered to be lower than 50 DEG C. In the humidity regulation processing stage, the processed floor blanks are placed in a balance chamber with the temperature being 30-50 DEG C and relative humidity being 70-80% and are processed for 7-12 days, and the water content is 5-7%. By means of the processing method, high-temperature heat treatment in the floor blanks is achieved, surface temperature is lower than 180 DEG C all the time, the dimensional stability of solid wood floors is improved, and the surfaces of the solid wood floors are kept in the natural color.
Description
Technical field
The present invention relates to wood processing technique field, especially a kind of dimensional stability processing method for heating floor blank, belongs to lumber functionality improvement and woodwork processing technique field.
Background technology
Solid wooden floor board is mid-to high-end product most popular in the category of all floors, has comfortable foot feeling, natural attractive in appearance, has insulation, regulates the functions such as indoor temperature and humidity, contamination-free release in use procedure.Generally focus on the overall background of environment people under, solid wooden floor board is the prioritizing selection in home decoration.Because the change timber along with external environment humiture can evaporate or absorb moisture, produce drying shrinkage or bulking, cause timber size unstable, make the defect such as timber and goods generation warpage, distortion and cracking.Although solid wooden floor board uses desiccated wood, by the impact of humiture change in air, and expand with wet and contract with dry phenomenon can be produced equally.In recent years to be used in floor heating environment gradually many for solid wooden floor board, whole moisture content due to traditional solid sawn flooring product is 8% ~ 12%, and floor heating temperature is generally 50 ~ 60 DEG C of (water supply 60 DEG C of JGJ142-2004 " ground radiation heating technical regulation " middle regulation, 50 DEG C, backwater, i.e. average temperature 55 DEG C, indoor air temperature 18 DEG C), long-term floor heating environment for use can make the moisture in floor evaporate and cause drying shrinkage, after terminating to enter summer for warm season, floor easily moisture expantion again, produces the defects such as cracking, gap, distortion.
High-temperature heat treatment technology (being commonly called as " charing ") is one of floor blank dimensional stability treatment technology, hygroscopicity and the moisture content remarkable reduction compared with common solid wooden floor board balanced with environment facies during actual use of high-temperature heat treatment solid wooden floor board, dimensional stability significantly improves.As to Ash, toothed oak wood, fragrant camphor tree, after lotus wood waits solid wooden floor board blank to carry out 185 DEG C of high-temperature heat treatment, its hygroscopicity reduces by 51.87%, dimensional stability improves 42.36%, and heat conduction efficiency exceedes solid wooden compound floor [Gu refining hundred, Li Tao, Tu Dengyun, Deng. the technique of superhigh temperature heat treatment solid wooden floor board and application. timber industry, 2007, 21 (3): 4-7], the dimensional stability that 200 DEG C of high-temperature heat treatment can improve disk beans floor blank reaches 55%[history rose, Bao Fucheng, Lv Jianxiong, Deng. heat treatment is on the impact of disk beans wood dimensional stability, Sino-South African Forestry University of Science and Technology's journal, 2011, 31 (7): 24-28].Current heat treatment technics uses steam or nitrogen as treatment media, conduct heat by externally to timber by treatment media in processing procedure, timber also makes color have greatly changed after high-temperature process while raising dimensional stability, light brown, dark brown, even black [Jiang Jinghui is turned to from low to high along with temperature is variable, Lv Jianxiong. high-temperature heat treatment is summarized wood color variable effect, World Forestry is studied, 2012,25 (1): 40-43], this is a technological deficiency for liking the customers of natural timber color.Not only therefore how to make floor have high dimensional stability but also keep its natural colour to be a technical problem urgently to be resolved hurrily.
This technology makes blank surface color remain unchanged, for heating floor Product processing provides technical support while being intended to the dimensional stability for improving ground heating solid wooden floor board.
Summary of the invention
Technical problem to be solved by this invention be to provide a kind of simple operation, process ground heating solid wooden floor board high-dimensional stability and keep the processing method of primary colors.
The technical scheme that the present invention solves the problems of the technologies described above is:
A processing method for ground heating solid wooden floor board blank, by the solid wooden floor board blank of moisture content scope at 6-15%, is placed in the microwave heating appts with negative pressure and carries out, comprise the following steps:
(1) heat treatment stages
A, the pre-heat treatment stage, the processing environment pressure making solid wooden floor board blank is 0.02 ~ 0.05MPa, and starts microwave, and make floor Preform surface temperature reach 50-80 DEG C, the processing time controls at 3-5 hour;
B, temperature rise period, processing environment pressure is made to be 0.05-0.09MPa, floor Preform surface temperature 110-130 DEG C; Processing time 1-3 hour;
C, high-temperature process stage, processing environment pressure is made to be 0.07-0.1MPa, floor Preform surface temperature 150-180 DEG C, processing time 2-5 hour;
D, temperature-fall period, pressure 0.1MPa, equipment is aeration-cooling, makes floor Preform surface temperature be down to less than 50 DEG C.
(2) the conditioning stage
Piled up by floor blank after heat treatment in (1) and be placed in temperature 30-50 DEG C, the balance cylinder of relative humidity 70-80%, process 7-12 days, makes the moisture content of solid wooden floor board blank be 5%-7%.
The processing method of a kind of ground heating solid wooden floor board of the present invention blank, microwave is adopted to carry out high-temperature heat treatment, achieve Fast Heating and process floor blank, in processing procedure, floor blank center and internal temperature are all the time higher than surface temperature, can reach the object improving center dimensional stability; In processing procedure, surface temperature is all the time lower than 180 DEG C, and larger change can not occur floor blank surface color.This technology improves the dimensional stability of solid wooden floor board blank and keeps surperficial natural colored, improves properties of product.
Accompanying drawing explanation
Fig. 1 Wood heat treatment device service chart
1. treatment box 2. hermatic door 3. infrared radiation thermometer 4. Pressure gauge 5. ventilation blower 6. microwave source 7. waveguide 8. vavuum pump
Fig. 2 a is the Pometia spp solid wooden floor board sample of this technical finesse
Fig. 2 b is conventional high temperature heat treatment Pometia spp solid wooden floor board sample
Fig. 3 a is the oak solid wooden floor board sample of this technical finesse
Fig. 3 b is conventional high temperature heat treatment oak solid wooden floor board sample
Detailed description of the invention
Arbitrary feature in process in all methods disclosed in this description or step, all can be replaced by other equivalences or the alternative features with similar object, that is, unless specifically stated otherwise, each feature is an example in a series of equivalence or similar characteristics.
Embodiment 1
By thickness be 25mm, moisture content scope at the Pometia spp solid wooden floor board blank of 12-15%, to be placed in treatment box 1, and start treatment process.Comprise the following steps:
(1) heat treatment stages
A, the pre-heat treatment stage, start vavuum pump 8, processing environment pressure is made to be 0.05MPa (Pressure gauge 4 shows), and start microwave source 6, microwave to be introduced in treatment box 1 plate blank material over the ground by waveguide 7 and carry out radiation heating, detect floor Preform surface temperature by infrared radiation thermometer 3, make floor Preform surface temperature reach 80 DEG C, the processing time controls at 3 hours;
B, temperature rise period, processing environment pressure is made to be 0.09MPa, floor Preform surface temperature 130 DEG C; 1 hour processing time;
C, high-temperature process stage, processing environment pressure is made to be 0.1MPa, floor Preform surface temperature 180 DEG C, 2 hours processing times;
D, temperature-fall period, pressure 0.1MPa, starts blower fan 5, makes greenhouse cooling in treatment box 1, when local plate blank material surface temperature is down to below 50 DEG C, closes ventilation blower, opens hermatic door 2, takes out processed floor blank.
(2) the conditioning stage
Pometia spp solid wooden floor board blank after heat treatment in (1) is piled up the balance cylinder being placed in temperature 30 DEG C, relative humidity 80%, processes 12 days.
Processing and can obtaining whole moisture content after balancing is 6.0% ± 0.5%, on thickness, moisture content deviation is 0.35%, dry residual-stress value is the Pometia spp floor blank that can be used for geothermal environment use of 0.75%, and floor blank surface color is constant, internal color is comparatively dark, and the more untreated material of dimensional stability improves 30%.
Embodiment 2
By thickness be 25mm, moisture content scope at the oak solid wooden floor board blank of 6-12%, to be placed in treatment box 1, and start treatment process.Comprise the following steps:
(1) heat treatment stages
A, the pre-heat treatment stage, start vavuum pump 8, processing environment pressure is made to be 0.02MPa (Pressure gauge 4 shows), and start microwave source 6, microwave to be introduced in treatment box 1 plate blank material over the ground by waveguide 7 and carry out radiation heating, detect floor Preform surface temperature by infrared radiation thermometer 3, make floor Preform surface temperature reach 50 DEG C, the processing time controls at 5 hours;
B, temperature rise period, processing environment pressure is made to be 0.05MPa, floor Preform surface temperature 110 DEG C; 3 hours processing times;
C, high-temperature process stage, processing environment pressure is made to be 0.07MPa, floor Preform surface temperature 150 DEG C, 5 hours processing times;
D, temperature-fall period, pressure 0.1MPa, starts blower fan 5, makes greenhouse cooling in treatment box 1, when local plate blank material surface temperature is down to below 50 DEG C, closes ventilation blower, opens hermatic door 2, takes out processed floor blank.
(2) the conditioning stage
Oak solid wooden floor board blank after heat treatment in (1) is piled up the balance cylinder being placed in temperature 50 C, relative humidity 70%, processes 7 days.
Processing and can obtaining whole moisture content after balancing is 6.2% ± 0.75%, on thickness, moisture content deviation is 0.25%, dry residual-stress value is the oak Wood flooring cants that can be used for geothermal environment use of 0.35%, and floor blank surface color is constant, internal color is comparatively dark, and the more untreated material of dimensional stability improves 35%.
Claims (3)
1. a ground heating processing method for solid wooden floor board blank, is characterized in that: by the solid wooden floor board blank of moisture content scope at 6-15%, be placed in the microwave heating appts with negative pressure and carry out, comprise the following steps:
(1) heat treatment stages
A, the pre-heat treatment stage, the processing environment pressure making solid wooden floor board blank is 0.02 ~ 0.05MPa, and starts microwave, and make floor Preform surface temperature reach 50-80 DEG C, the processing time controls at 3-5 hour; B, temperature rise period, processing environment pressure is made to be 0.05-0.09MPa, floor Preform surface temperature 110-130 DEG C; Processing time 1-3 hour; C, high-temperature process stage, processing environment pressure is made to be 0.07-0.1MPa, floor Preform surface temperature 150-180 DEG C, processing time 2-5 hour; D, temperature-fall period, pressure 0.1MPa, equipment is aeration-cooling, makes floor Preform surface temperature be down to less than 50 DEG C;
(2) the conditioning stage
Floor blank after heat treatment is placed in temperature 30-50 DEG C, the balance cylinder of relative humidity 70-80%, process 7-12 days, makes the moisture content of solid wooden floor board blank be 5%-7%.
2. the processing method of ground heating solid wooden floor board blank according to claim 1, is characterized in that, described treatment facility is the box-type equipment that can bear 0.02 ~ 0.1MPa pressure.
3. the processing method of ground heating solid wooden floor board blank according to claim 1, is characterized in that, described floor Preform surface temperature uses infrared measurement of temperature equipment or instrument to measure.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105922424A (en) * | 2016-06-24 | 2016-09-07 | 湖州千豪家私有限公司 | Heated floor |
| CN105922415A (en) * | 2016-06-26 | 2016-09-07 | 贺州市恒达板业有限公司 | Improvement method of solid wood board |
| CN105965638A (en) * | 2016-07-11 | 2016-09-28 | 中国林业科学研究院林业新技术研究所 | Microwave treatment reconstructed material and preparing methods thereof |
| CN108247788A (en) * | 2016-12-28 | 2018-07-06 | 中山市大自然木业有限公司 | A kind of method for improving solid wood slab dimensional stability |
| CN108931108A (en) * | 2017-05-26 | 2018-12-04 | 久盛地板有限公司 | Solid wood ground heating floor timber microwave vacuum drying process |
| CN112454576A (en) * | 2020-11-24 | 2021-03-09 | 湖南威达尔木业科技有限公司 | Wood modification heat treatment process and treatment equipment |
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Cited By (9)
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| CN105965638A (en) * | 2016-07-11 | 2016-09-28 | 中国林业科学研究院林业新技术研究所 | Microwave treatment reconstructed material and preparing methods thereof |
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| CN108247788B (en) * | 2016-12-28 | 2019-08-02 | 中山市大自然木业有限公司 | A method of for improving solid wood slab dimensional stability |
| CN108931108A (en) * | 2017-05-26 | 2018-12-04 | 久盛地板有限公司 | Solid wood ground heating floor timber microwave vacuum drying process |
| CN112454576A (en) * | 2020-11-24 | 2021-03-09 | 湖南威达尔木业科技有限公司 | Wood modification heat treatment process and treatment equipment |
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Application publication date: 20160113 |