CN116533339A - Preparation method and application of single-side compression layer positioning quantitative compressed wood - Google Patents
Preparation method and application of single-side compression layer positioning quantitative compressed wood Download PDFInfo
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- CN116533339A CN116533339A CN202310172447.6A CN202310172447A CN116533339A CN 116533339 A CN116533339 A CN 116533339A CN 202310172447 A CN202310172447 A CN 202310172447A CN 116533339 A CN116533339 A CN 116533339A
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- 239000002023 wood Substances 0.000 title claims abstract description 155
- 238000007906 compression Methods 0.000 title claims abstract description 107
- 230000006835 compression Effects 0.000 title claims abstract description 105
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 238000009826 distribution Methods 0.000 claims abstract description 15
- 238000002791 soaking Methods 0.000 claims abstract description 14
- 239000007787 solid Substances 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 6
- 238000003825 pressing Methods 0.000 claims description 38
- 238000000034 method Methods 0.000 claims description 22
- 238000001816 cooling Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000007493 shaping process Methods 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 3
- 230000000750 progressive effect Effects 0.000 claims description 3
- 230000008719 thickening Effects 0.000 claims description 3
- 238000005452 bending Methods 0.000 abstract description 6
- 238000000280 densification Methods 0.000 abstract description 5
- 238000007731 hot pressing Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 62
- 239000000463 material Substances 0.000 description 11
- 239000002344 surface layer Substances 0.000 description 8
- 210000002421 cell wall Anatomy 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 244000044283 Toxicodendron succedaneum Species 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 240000008670 Pinus densiflora Species 0.000 description 2
- 235000000405 Pinus densiflora Nutrition 0.000 description 2
- 241000183024 Populus tremula Species 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000009477 glass transition Effects 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 241000894007 species Species 0.000 description 2
- 241000208140 Acer Species 0.000 description 1
- 241000218645 Cedrus Species 0.000 description 1
- 244000166124 Eucalyptus globulus Species 0.000 description 1
- 241000219071 Malvaceae Species 0.000 description 1
- 240000002834 Paulownia tomentosa Species 0.000 description 1
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 1
- 241000018646 Pinus brutia Species 0.000 description 1
- 235000011613 Pinus brutia Nutrition 0.000 description 1
- 240000007263 Pinus koraiensis Species 0.000 description 1
- 235000011615 Pinus koraiensis Nutrition 0.000 description 1
- 241000219000 Populus Species 0.000 description 1
- 241000168036 Populus alba Species 0.000 description 1
- 241000124033 Salix Species 0.000 description 1
- 239000004902 Softening Agent Substances 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 150000002466 imines Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 238000011417 postcuring Methods 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
Classifications
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- 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
-
- 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
- B27K3/02—Processes; Apparatus
-
- 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
- B27K5/0085—Thermal treatments, i.e. involving chemical modification of wood at temperatures well over 100°C
Abstract
The invention discloses a preparation method and application of single-side compression layer positioning quantitative compression wood, wherein the invention selectively densifies and compresses one side of the wood which needs to bear larger external force through hydrothermal control, and the other parts still keep the inherent characteristics of the wood; meanwhile, compression deformation is pre-fixed through a hot plate high-temperature hot-pressing drying technology, so that the problems of tile-shaped bending and the like caused by asymmetric hydrothermal distribution in the preparation process can be effectively prevented. The invention can determine the forming position of the compression layer according to the preheating treatment time, and determine the forming thickness of the compression layer through the closing time and the soaking time of the press, thereby realizing the selective quantitative directional densification of the wood compression layer. The invention can be applied to compressed solid wood floors, furniture or wood products and has wide application prospect.
Description
Technical Field
The invention relates to the technical field of wood compression, in particular to a preparation method and application of single-side compression layer positioning quantitative compressed wood.
Background
At present, the single-side surface compression of the wood mainly adopts a temperature and humidity difference method, namely, the single-side wood cell wall is promoted to be changed into a high-elasticity state from glass by the methods of soaking, spraying, steaming, heating and the like, the other side of the wood always keeps a low-temperature dry glass state, the single-side surface compression densification of the wood is realized under the action of mechanical force, and further, the surface hardness, the surface wear resistance, the surface strength and the like of the using surface of the wood are improved. Chinese patent CN 108582378A discloses a single-sided surface layer compressed wood and a preparation method thereof, the method is that a hot pressing plate on a press is heated to 150-220 ℃, the wood is laid on a cold pressing plate after being dried, the upper surface of the wood is contacted and preheated, the wood is compressed to a required thickness under 6-15 MPa, then pressure is maintained, the pressure is reduced to 1-3 MPa under 150-220 ℃ and the pressure is maintained, and the single-sided surface layer compressed wood is obtained after unloading. Also has researches by scholars, and found that the thickness of a compact layer of the Pinus densiflora compression wood can reach 4mm and the density peak value can reach 0.92g/cm by utilizing the temperature difference method to unilaterally compress the Pinus densiflora compression wood with the water content of 9-16 percent 3 . Chinese patent CN113334514A publicationThe method for preparing the oil-planted hot single-sided surface compression densified wood is characterized in that the lower surface layer of the wood is immersed into dimethyl silicone oil preheated to 160-180 ℃ for 8-12min, taken out, placed in a hot press with an upper pressing plate unheated and a lower pressing plate preheated to 160-180 ℃, the oil-soaked surface of the wood is placed on the lower pressing plate, hot pressed for 10-15min, and the wood is gradually compressed to the required thickness. The temperature of the lower pressing plate is increased to 220-240 ℃, the hot pressing pressure is reduced to 0.05-0.1Mpa, the lower pressing plate is kept for 30-50min, so that the wood in the hot press is basically shaped, the heating of the lower pressing plate is stopped, the lower pressing plate is cooled by a cooling medium, the temperature of the lower pressing plate is rapidly reduced to 60-100 ℃, and then the wood is taken out from the hot press. Compared with other compression processes, the single-side surface compression process of the wood is still in a research and improvement stage, and the prepared single-side compressed wood density structure also presents asymmetry because the internal moisture distribution and the temperature distribution of the wood in the preparation process are obvious, so that the problem of tile bending deformation of the compressed wood can occur, and particularly the production yield is low because of the moisture distribution, the temperature distribution difference and the difficult regulation and control property in the preparation process. And there are problems in that the thickness of the compression layer is thin and the high-density compression layer may disappear due to later polishing, sanding and grinding.
Disclosure of Invention
The invention aims to provide a preparation method and application of single-side compression layer positioning quantitative compressed wood. The invention can realize the selective quantitative directional densification of the wood compression layer and has the advantages of simple operation and high wood utilization rate.
The technical scheme of the invention is as follows: a preparation method of single-side compression layer positioning quantitative compression wood comprises the following steps:
step 1, carrying out single-side soaking treatment on wood for 10 minutes to 6 hours;
step 2, preheating a lower pressing plate of the hot press to 70-250 ℃, controlling the temperature of an upper pressing plate of the hot press to be below 60 ℃, then placing wood in the hot press, enabling the surface to be compressed of the wood to face the lower pressing plate of the hot press, enabling the other surface of the wood to face the upper pressing plate of the hot press, and then rapidly closing the hot press;
step 3, preheating and compressing according to the thickness of the actual compression layer and the quantitative positioning requirement of the position after closing, wherein the forming position of the compression layer is determined by the preheating time, and the forming thickness of the compression layer is determined by the closing time and the soaking time of the press;
step 4, regulating the temperature of the upper pressing plate and the lower pressing plate to be 160-250 ℃ after compression, and carrying out hot plate high-temperature pre-shaping treatment on the pre-compressed wood with asymmetric hydrothermal distribution in the step 3 by using a hot press drying method, wherein the treatment time is 0.5-5 hours;
and 5, cooling the wood in the state of being upper and lower pressing plates and compressed after the pre-shaping treatment is finished, cooling to below 70 ℃, and opening a hot press after cooling to obtain the compressed wood with the single-side compression layer positioned and quantified.
In the preparation method of the single-side compression layer positioning quantitative compressed wood, in the step 1, the water content of the wood subjected to the soaking treatment is more than 14%.
In the step 2, the lower pressing plate of the hot press is preheated to 90-180 ℃, the temperature of the upper pressing plate of the hot press is controlled to be 20-50 ℃, and the closing speed is 3mm/s.
In the preparation method of the single-side compression layer positioning quantitative compressed wood, in the step 3, the preheating time is 10-600S, and the distance between the compression layer and the surface of the wood is 0.1-10mm.
In the above preparation method of single-side compression layer positioning quantitative compressed wood, in step 3, the closing time of the hot press is 20-200s, and the thickness of the compression layer is 1-20mm.
In the step 3, the compression speed is 0.1-2mm/s, intermittent pressurizing and progressive thickening compression treatment is adopted, and each pressurizing interval is 20s until the wood reaches the preset compression thickness.
In the above preparation method of single-side compression layer positioning quantitative compressed wood, in step 4, the temperature of the upper and lower pressing plates is regulated and controlled between 180 ℃ and 200 ℃ after compression is completed, and the high-temperature pre-shaping treatment time is 1-2.5 hours.
In the preparation method of the single-side compression layer positioning quantitative compressed wood, in the step 5, the temperature of the cooling treatment is reduced to below 60 ℃ to room temperature.
The application of the preparation method of the single-side compression layer positioning quantitative compressed wood applies the compression layer positioning quantitative compressed wood to compressed solid wood floors, furniture or wood products.
Compared with the prior art, the invention adopts a hydrothermal control method, develops a control technology of single-side compression of solid wood, and realizes selective quantitative directional densification of a wood compression layer. According to the invention, through hydrothermal control, the compaction compression of one side of the wood which needs to bear larger external force is selectively enhanced, and the other parts still keep the inherent characteristics of the wood; meanwhile, compression deformation is pre-fixed through a hot plate high-temperature hot-pressing drying technology, so that the problems of tile-shaped bending and the like caused by asymmetric hydrothermal distribution in the preparation process can be effectively prevented. According to the invention, the position and thickness of the compression layer, namely the position where the maximum density appears, can be determined according to the actual requirements of the wood product production process, such as the thickness requirements of sanding or planing when the solid wood floor or furniture is processed, so that the invention can adapt to the process requirements of different wood products. The invention can also reduce the loss of wood and the cost on the basis of meeting the requirements of the actual physical and mechanical properties of the wood products, and has the advantages of simple processing and convenient operation.
Drawings
FIG. 1 is a schematic flow chart of the present invention;
FIG. 2 is a graph of lacquer tree material and surface compressed wood density profile;
FIG. 3 is a graph of the density profile of aspen material and surface compressed wood;
FIG. 4 is a graph of compressed wood density profiles for different tree species.
Detailed Description
The following examples are given to further illustrate the invention, but are not to be construed as limiting the invention.
Example 1: a preparation method of single-side compression layer positioning quantitative compression wood comprises the following steps:
1. the required materials are as follows:
a. density of 200-600kg/m 3 Is used for the production of a wood material,or a density of 600kg/m 3 The following wood includes artificial woods and natural woods, such as paulownia, bai Tong, cedar, fir, korean pine, arhat pine, maple, aspen, poplar, willow, eucalyptus, basswood, lacquer tree, etc., and also includes all imported fast-growing wood;
b. processing wood into a plate, which can be a chord-wise plate, a chord-wise radial plate, a radial plate, preferably a chord-wise plate;
c. the thickness is 2-500 mm, and can be any workable thickness, preferably 5-150 mm;
d. carrying out planing and sanding treatment on the sawed wood board surface to enable the surface to be flat, or carrying out no surface flattening treatment on the sawed board;
e. softening agent: water, ammonia, an aqueous alkaline solution, and one or more of imines, ketones, ethers, alcohols, nitriles, amides, esters, carboxylic acids having a boiling point below 200 ℃.
2. The required instrument equipment:
a. a container for immersing wood, such as a water tank, of a size that allows the wood to be immersed in its entirety;
b. the hot press is provided with or without a cooling function, preferably with a cooling function;
pressure of not less than 10kgf/cm 2 Preferably 30 to 50kgf/cm 2 ；
The maximum closing speed is not less than 0.5mm/s, preferably more than 5 mm/s;
the height of the opening gear is 2-40 cm, preferably 5-15 cm;
single or multiple layers;
the temperature reached 250 ℃.
After the materials and instruments are prepared, as shown in fig. 1, the following steps are performed:
step 1, soaking a surface to be compressed of wood with the water content of below 14% in water at normal temperature or heated to below 100 ℃ for 10 minutes to 6 hours, wherein the required soaking time can be determined according to the thickness of a compression layer; the wood with the water content of 14-30% can be directly used, can be soaked for a short time, and is blocked or unblocked when soaked, and the time is determined according to the position of the target compression layer; wood with water content of more than 30% can be directly used for compression;
step 2, preheating a lower pressing plate of a hot press to 70-250 ℃, wherein the preferable range is 90-180 ℃, and the lower pressing plate is set at 150 ℃ in the embodiment; the temperature of the upper pressing plate of the hot press is controlled below 60 ℃, preferably 20-50 ℃, and in the embodiment, the upper pressing plate is set at 30 ℃; then placing the wood in a hot press, wherein the surface to be compressed of the wood faces towards a lower pressing plate of the hot press, and the other surface of the wood faces towards an upper pressing plate of the hot press, and then rapidly closing the hot press, wherein the closing speed is more than 0.05mm/s, and the closing speed is more than 3mm/s in the embodiment;
and 3, carrying out preheating compression treatment according to the quantitative positioning requirements of the thickness and the position of the actual compression layer after closing, wherein the forming position of the compression layer is determined by the preheating treatment time, the preheating time is 10-600S, the distance between the formable compression layer and the surface of the wood is 0.1-10mm, the forming thickness of the compression layer is determined by the closing time and the soaking time of the press, the closing time is 20-200S, the soaking time is 10 minutes-6 hours in the step 1, and the formable compression layer thickness is 1-20mm.
In this embodiment, taking compression of 5mm as an example, the process parameters for the compressed layer position control are as follows
Table 1 shows:
TABLE 1
In this example, the process parameters for controlling the thickness of the compressive layer are shown in table 2 below:
TABLE 2
The compression speed is 0.05 to 3mm/s, preferably 0.1 to 2mm/s, and is set to 1mm/s in this embodiment; intermittent compression may also be used, the method: after the press is closed, wood is preheated for a prescribed time, and intermittent pressurizing and progressive thickening compression treatment is started. Each pressurizing interval is 20s until the wood reaches a preset compression thickness;
the compression amount is controlled by a thickness gauge, the compression amount is 1-20mm, a compression layer with the thickness of 0.5-10 mm is formed on one side of the wood, which is soaked in water and preheated, preferably, the compression amount is 2-5 mm, and a compression layer with the thickness of 1-2.5 mm is formed on one side of the wood.
Step 4, after compression is completed, the temperature of the upper and lower pressing plates is regulated and controlled to be 160-250 ℃, preferably 180-200 ℃, and in the embodiment, 190 ℃; carrying out hot plate high-temperature pre-shaping treatment on the pre-compressed wood with asymmetric hydrothermal distribution in the step 3 by using a hot press drying method, wherein the treatment time is 0.5-5 hours, and the treatment time is set to be 3 hours in the embodiment;
and 5, cooling the wood in the state of being upper and lower pressing plates and compressed after the pre-forming treatment is finished, and cooling to below 70 ℃, in this embodiment, cooling to room temperature, and opening a hot press after cooling to obtain the compressed wood with the single-side compression layer positioned and quantified.
Through experiments and effect detection, the invention can realize quantitative positioning regulation and control of the single-side compression layer of the compressed wood, for example, the thickness of a surface reserved layer, namely a sanding or planing layer, is 0.5-1.5 mm, and the thickness of the reserved layer is controlled to be 1-5 mm. For the sanding or planing thickness requirements during the processing of solid wood floors or furniture, the position and thickness of the compression layer, namely the position where the maximum density occurs, such as sanding by 0.3mm, are determined, and the compression layer is positioned below the surface layer by adjusting the process, so that the laminated compressed wood is polished or the compression layer is positioned right on the surface layer after sanding. By detecting the density of the compressed wood, the density of the laminated compressed wood compression layer is more than 30% higher than that of the uncompressed layer, namely, the density reaches 600kg/m 3 The density difference between the compressed layer and the uncompressed layer is 150kg/m 3 The above. FIG. 2 is a density distribution diagram of lacquer tree material and surface compressed wood (SCW represents compressed wood, 00, 01 and 04 represent the distance of the density peak from the surface, respectively), FIG. 3 is a density distribution diagram of white poplar material and surface compressed wood (SCW represents compressed wood, 00, 01 and 04 represent the distance of the density peak from the surface, respectively), FIG. 4 is a density distribution diagram of surface compressed wood of different tree species. As can be seen from fig. 2 and 3, for the material, the density distribution is relatively smooth and appears to be nearly straight, whereas for SCW-00 compressed wood, the position of the compressed layer is located at the surface of the wood, i.e., the distance of the peak of the density distribution curve from the surface is 0mm, for SCW-01 compressed wood, the position of the compressed layer is located at about 2mm from the surface of the wood, and for SCW-04 compressed wood, the position of the compressed layer is located at about 4mm from the surface of the wood, which illustrates that the method of the present invention can be adopted to realize the control of the position of the compressed layer. It can also be seen from fig. 4 that the control of the layer position can be achieved for different fast-growing materials when the present invention is used for compression. As for the thickness of the compressed layer, it can be seen in fig. 2 and 3 that the thickness width of the density peak varies from SCW-00 compressed wood to SCW-04 compressed wood from about 2mm to 5-6mm, which further illustrates that the present invention can realize the control of the thickness of the compressed layer.
By detecting the hardness of the compressed wood, the hardness of the compressed surface of the compressed wood with the single-side surface layer is improved by 50-400 percent, and is generally improved by 100-200 percent. By detecting the wear resistance of the compressed wood, the wear resistance of the compression surface of the single-side surface layer compressed wood is improved by 50-150% compared with that of an uncompressed layer. By detecting the bending strength of the compressed wood, the bending strength of the compressed wood with a single-side surface layer is improved by 20% -80%, and the elastic modulus is improved by 20% -80%. The single-side compression layer positioning quantitative compression solid wood floor blank production method breaks through the limit value of the utilization rate of the soft low-density wood volume on the basis of meeting the actual physical and mechanical property requirements of the floor material. At a density of 400kg/m 3 For example, a wood material with a thickness of 25mm is to achieve a compressed layer density of 800kg/m 3 Is 50% of the overall compressed wood loss rate; assuming that a thickness of the compression layer of 2mm is required, the wood volume loss rate for double sided surface compression is 16% while the volume loss rate for single sided surface compression is only 8%. The invention puts the lower surface of the wood on a high temperature hot plate after soaking treatment, the glass transition temperature of the cell wall of the wood on the lower surface can be obviously reduced to promote the glass transition of the woodThe wood cell wall is always in a glass state, and the water content of the upper surface and the temperature of the pressing plate are relatively low. Therefore, the rigidity of the wood cell wall in the preparation process shows a remarkable gradient decreasing trend from the lower surface to the upper surface, the cells on the lower surface of the wood are compressed and compacted to show high density under the action of the machinery, and the upper surface shows a low density state of the original wood. Therefore, the invention can reduce the loss of wood and the cost on the basis of meeting the requirements of the actual physical and mechanical properties of the wood products, and has the advantages of simple processing and convenient operation.
Example 2: on the basis of the embodiment 1, the compressed wood with the fixed positioning and quantitative side compression layer is applied to the compressed solid wood floor or furniture. In this embodiment, taking a floor blank as an example, after compressed wood is obtained, a single-side surface compressed solid wood floor blank can be obtained through the procedures of post-curing, back grooving, four-side polishing, surface sanding and the like.
The core technical scheme of the invention is that the solid wood floor is selectively compacted and compressed and reinforced on one side needing to bear larger external force through hydrothermal control, and the rest parts still keep the inherent characteristics of wood; the invention realizes the pre-fixation of compression deformation by hot plate high-temperature hot-pressing drying technology, can effectively prevent the problems of tile-shaped bending and the like caused by asymmetric hydrothermal distribution in the preparation process, can determine the forming position of a compression layer according to the pre-heating treatment time, and can determine the forming thickness of the compression layer by the closing time and the soaking time of a press so as to realize the selective quantitative directional densification of the wood compression layer.
The above embodiments are only preferred embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, within the scope of the present invention, should be covered by the protection scope of the present invention by making equivalents and modifications according to the technical scheme and the inventive concept of the present invention.
Claims (9)
1. A preparation method of single-side compression layer positioning quantitative compression wood is characterized by comprising the following steps: the method comprises the following steps:
step 1, carrying out single-side soaking treatment on wood for 10 minutes to 6 hours;
step 2, preheating a lower pressing plate of the hot press to 70-250 ℃, controlling the temperature of an upper pressing plate of the hot press to be below 60 ℃, then placing wood in the hot press, enabling the surface to be compressed of the wood to face the lower pressing plate of the hot press, enabling the other surface of the wood to face the upper pressing plate of the hot press, and then rapidly closing the hot press;
step 3, preheating and compressing according to the thickness of the actual compression layer and the quantitative positioning requirement of the position after closing, wherein the forming position of the compression layer is determined by the preheating time, and the forming thickness of the compression layer is determined by the closing time and the soaking time of the press;
step 4, regulating the temperature of the upper pressing plate and the lower pressing plate to be 160-250 ℃ after compression, and carrying out hot plate high-temperature pre-shaping treatment on the pre-compressed wood with asymmetric hydrothermal distribution in the step 3 by using a hot press drying method, wherein the treatment time is 0.5-5 hours;
and 5, cooling the wood in the state of being upper and lower pressing plates and compressed after the pre-shaping treatment is finished, cooling to below 70 ℃, and opening a hot press after cooling to obtain the compressed wood with the single-side compression layer positioned and quantified.
2. The method for preparing single-sided compression layer positioned quantitative compressed wood according to claim 1, wherein: in the step 1, the water content of the wood subjected to the soaking treatment is more than 14%.
3. The method for preparing single-sided compression layer positioned quantitative compressed wood according to claim 1, wherein: in the step 2, the lower pressing plate of the hot press is preheated to 90-180 ℃, the temperature of the upper pressing plate of the hot press is controlled to 20-50 ℃, and the closing speed is 3mm/s.
4. The method for preparing single-sided compression layer positioned quantitative compressed wood according to claim 1, wherein: in the step 3, the preheating time is 10-600S, and the distance between the compression layer and the wood surface is 0.1-10mm.
5. The method for preparing single-sided compression layer positioned quantitative compressed wood according to claim 1, wherein: in the step 3, the closing time of the hot press is 20-200s, and the thickness of the compression layer is 1-20mm.
6. The method for preparing single-sided compression layer positioned quantitative compressed wood according to claim 1, wherein: in the step 3, the compression speed is 0.1-2mm/s, intermittent pressurizing and progressive thickening compression treatment is adopted, and each pressurizing interval is 20s until the wood reaches the preset compression thickness.
7. The method for preparing single-sided compression layer positioned quantitative compressed wood according to claim 1, wherein: in the step 4, the temperature of the upper and lower pressing plates is regulated and controlled between 180 and 200 ℃ after the compression is finished, and the high-temperature pre-shaping treatment time is 1 to 2.5 hours.
8. The method for preparing single-sided compression layer positioned quantitative compressed wood according to claim 1, wherein: in the step 5, the temperature of the cooling treatment is reduced to below 60 ℃ to room temperature.
9. Use of the method for the preparation of single-sided compressed layer positioned quantitative compressed wood according to any one of claims 1 to 8, characterized in that: the compressed wood with the side compression layer positioned and quantified is applied to a compressed solid wood floor, furniture or wood products.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310172447.6A CN116533339A (en) | 2023-02-28 | 2023-02-28 | Preparation method and application of single-side compression layer positioning quantitative compressed wood |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310172447.6A CN116533339A (en) | 2023-02-28 | 2023-02-28 | Preparation method and application of single-side compression layer positioning quantitative compressed wood |
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| Publication Number | Publication Date |
|---|---|
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| CN113334514A (en) * | 2021-07-01 | 2021-09-03 | 南京林业大学 | Preparation method of oil-heated single-surface-layer compressed and densified wood |
| CN114407150A (en) * | 2022-01-27 | 2022-04-29 | 广东祥通供应链管理有限公司 | Energy-saving preparation method of environment-friendly functional wood |
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| CN113334514A (en) * | 2021-07-01 | 2021-09-03 | 南京林业大学 | Preparation method of oil-heated single-surface-layer compressed and densified wood |
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