CN110978190A - Preparation process of carbonized fiber board and application of carbonized fiber board to carbonized composite floor base material - Google Patents
Preparation process of carbonized fiber board and application of carbonized fiber board to carbonized composite floor base material Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
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- 238000004513 sizing Methods 0.000 claims description 4
- 238000010000 carbonizing Methods 0.000 claims description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 2
- 108010073771 Soybean Proteins Proteins 0.000 claims description 2
- 229920001807 Urea-formaldehyde Polymers 0.000 claims description 2
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 claims description 2
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- 150000002513 isocyanates Chemical class 0.000 claims description 2
- 238000003475 lamination Methods 0.000 claims description 2
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
- B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
- B27M1/06—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by burning or charring, e.g. cutting with hot wire
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
- B27D1/06—Manufacture of central layers; Form of central layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
- B27L11/00—Manufacture of wood shavings, chips, powder, or the like; Tools therefor
- B27L11/08—Manufacture of wood shavings, chips, powder, or the like; Tools therefor of wood fibres, e.g. produced by tearing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
- B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F15/00—Flooring
- E04F15/02—Flooring or floor layers composed of a number of similar elements
- E04F15/04—Flooring or floor layers composed of a number of similar elements only of wood or with a top layer of wood, e.g. with wooden or metal connecting members
- E04F15/041—Flooring or floor layers composed of a number of similar elements only of wood or with a top layer of wood, e.g. with wooden or metal connecting members with a top layer of wood in combination with a lower layer of other material
- E04F15/042—Flooring or floor layers composed of a number of similar elements only of wood or with a top layer of wood, e.g. with wooden or metal connecting members with a top layer of wood in combination with a lower layer of other material the lower layer being of fibrous or chipped material, e.g. bonded with synthetic resins
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Architecture (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
The invention belongs to the technical field of wood processing and manufacturing, relates to the manufacturing of fiberboards, and particularly relates to a preparation process of a carbonized fiberboard. The invention also applies the prepared carbonized fiber board to a carbonized composite floor substrate, and the carbonized fiber board is formed by laminating and stacking a panel, a core board and a bottom board in sequence from top to bottom and bonding and curing the panel, the core board and the bottom board by glue layers, wherein the panel is a high-temperature carbonized solid wood board, the core board is a carbonized fiber board, the bottom board is a high-temperature carbonized solid wood veneer, and the panel, the core board and the bottom board are stacked in a staggered or non-staggered manner. The preparation process is simple, the existing process is not required to be improved, and the method can be directly used for factory production; the core board is used as the core board of the base material of the carbonized composite floor, the moisture and mildew resistance of the core board is improved, and resin and unstable phenolic substances are volatilized and decomposed, so that the overall strength of the floor is enhanced.
Description
Technical Field
The invention belongs to the technical field of wood processing and manufacturing, relates to the manufacturing of fiberboards, and particularly relates to a preparation process of a carbonized fiberboard and application of the carbonized fiberboard to a carbonized composite floor substrate.
Background
At present, composite solid wood floors are mainly divided into multilayer solid wood floors and three-layer solid wood composite floors, wherein the three-layer solid wood composite floors are closer to pure solid wood. The three-layer solid wood composite floor is formed by combining three layers of thin solid wood boards in a criss-cross mode, and the surface layer of the floor is generally as follows: the high-quality solid wood such as ash wood, oak, maple, teak, walnut, hickory or eggplant wood is adopted in the middle layer and the bottom layer, and the like: pine, poplar and other fast growing wood with high elasticity. The surface layer of the three-layer solid wood composite floor needs to consume a large amount of precious wood, and the existing composite floor base material is easy to deform and crack.
With the growing scarcity of wood resources and the requirement of environmental protection, how to use fast growing wood to manufacture a three-layer solid wood composite floor with the same surface decoration effect as that of precious wood is a difficult problem to be solved urgently in the prior art.
The carbonized wood fiber board is a man-made fiber board formed by mixing and hot-pressing carbonized wood fibers or common wood fibers, the fiber board can use fibers prepared from blue-modified materials, the current situation of wood resource shortage is greatly relieved, and the carbonized wood fiber board has high dimensional stability, has the characteristics of moisture resistance, mildew resistance and warping resistance, and is suitable for wet environments such as bathrooms, kitchens and the like.
Aiming at the above objects, the invention utilizes fast growing wood to manufacture solid wood floor base materials with surface decoration effects similar to precious wood, simultaneously overcomes the problems of poor dimensional stability, cracking, deformation and the like of the existing solid wood composite floors caused by environmental problems, and has positive significance for protecting environment and saving resources.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to disclose a preparation process of a carbonized fiber board and application of the carbonized fiber board to a carbonized composite floor base material.
In order to realize the technical effect of the invention, the following technical scheme is adopted for realizing the technical effect:
a process for preparing carbonized fiber board includes such steps as preparing carbonized wood fiber, mixing, applying glue, drying, spreading, hot pressing, cooling, polishing, inspecting, packing and storing,
in the carbonized wood fiber preparation step, after wood raw materials are cleaned, peeled, impurity-removed, dried and sliced, wood chips are carbonized in a carbonization kiln, the temperature in the carbonization kiln is increased from room temperature to 100-120 ℃ at the speed of 30-50 ℃/h, the temperature is kept for 1-3 h, preferably to 105 ℃, and the temperature is kept for 1.5 h; raising the temperature in the kiln to 160-220 ℃ at the speed of 40-50 ℃/h, keeping the temperature for 1-3 h, preferably raising the temperature to 180 ℃, keeping the temperature for 1.5h, then lowering the temperature in the kiln to 120 ℃ at the speed of 20 ℃/h, closing a heat source, opening a kiln door, naturally cooling to room temperature, and taking out the wood chips; and putting the carbonized wood chips into a high-speed crusher to be ground into carbonized wood fiber powder.
In the preferred embodiment of the present invention, the humidity in the kiln is maintained at 100% in the step of preparing the carbonized wood fiber.
In the preferred embodiment of the invention, in the step of mixing and sizing, the prepared carbonized wood fiber powder and the common wood fiber are mixed in a proportion of 1: 9-9: 1, the adhesive is uniformly mixed, and the adhesive application amount of the thermosetting adhesive is 80-150 kg/m3。
The thermosetting adhesive comprises one or more of urea-formaldehyde resin, phenolic resin, isocyanate resin, lignin adhesive, soybean protein adhesive and the like.
The performance of the carbonized fiber board prepared by the process of the invention meets the standard requirements of LY/T1611-2011 fiberboard for floor base materials.
It is a further object of the present invention to use the resulting carbonized fiber board as a core board for a carbonized composite floor substrate.
The utility model provides a carbonization composite floor substrate is from last to being panel, core and bottom plate down in proper order, wherein, the panel is the solid wood board of high temperature carbonization, the core is the carbonized fiber board, the bottom plate is the solid wood veneer of high temperature carbonization, panel, core, bottom plate lamination stack and are formed by the glue film bonding solidification, stack including crisscross or not crisscross, preferably crisscross, carbonization composite floor substrate's thickness is 6 ~ 18mm, preferred thickness 12 mm.
In the preferred embodiment of the invention, the thickness of the panel is 1-3 mm, and the preferred thickness is 3 mm.
In the preferred embodiment of the invention, the thickness of the bottom plate is 1-2 mm, and the preferred thickness is 1 mm.
In the preferred embodiment of the invention, the preparation method of the panel and the carbonization thereof comprises ten working procedures of cutting → drying → stacking → entering a kiln → preheating → high-temperature drying → heating → carbonization → cooling → leaving the kiln; wherein the content of the first and second substances,
in the preheating step, the temperature in the kiln is increased from room temperature to 70-80 ℃ at the speed of 5-10 ℃/h, and the temperature is kept for 1-2 h;
in the drying step, the temperature in the kiln is raised to 100-105 ℃, and the temperature is kept for 1-2 h;
in the temperature rising step, the temperature in the kiln is raised to 120-140 ℃ at the temperature rising speed of 10-15 ℃/h, and the humidity in the kiln is kept at 100%;
in the carbonization step, gradually increasing the temperature to 160-200 ℃ at the speed of 3-5 ℃/h, and keeping the temperature for 1-3 h, wherein the humidity in the kiln is kept at 100%;
in the cooling step, the temperature in the kiln is cooled at 3-5 ℃/h when the temperature is above 120 ℃, the temperature in the kiln is cooled at 5-10 ℃/h when the temperature is below 120 ℃, steam is sprayed into the kiln every 30min, and the humidity in the kiln is reduced from 100% to 40-50%; when the temperature in the heat treatment box is reduced to 80-100 ℃, the heat source is closed, and the kiln is opened after the temperature is naturally reduced to room temperature.
According to the panel carbonization preparation method, in the preheating step, the carbonization step and the cooling step, when carbonized wood with different colors is required, the panel carbonization preparation method can be used for production and processing according to the method shown in the following table:
in the preferred embodiment of the invention, the preparation method of the base plate and the carbonization thereof comprises ten working procedures of cutting → drying → stacking → entering a kiln → preheating → high-temperature drying → heating → carbonization → cooling → leaving the kiln; wherein the content of the first and second substances,
in the preheating step, the temperature in the kiln is increased from room temperature to 70-80 ℃ at a speed of 15-20 ℃/h, and the temperature is kept for 0.5-1 h;
in the drying step, the heat preservation time is 0.5-1 h;
in the temperature rising step, the temperature in the kiln is raised to 120-140 ℃ at the temperature rising speed of 20-30 ℃/h;
in the carbonization step, gradually increasing the temperature to 160-180 ℃ at a speed of 10-15 ℃/h, and keeping the temperature for 1-2 h;
in the cooling step, when the temperature in the kiln is above 120 ℃, cooling is carried out at a speed of 5-10 ℃/h, when the temperature in the kiln is below 120 ℃, cooling is carried out at a speed of 10-15 ℃/h, water vapor is sprayed into the kiln every 30min, and the humidity in the kiln is reduced from 100% to 40-50%; when the temperature in the heat treatment box is reduced to 80-100 ℃, the heat source is closed, and the kiln is opened after the temperature is naturally reduced to room temperature.
According to the carbonized composite floor substrate prepared by the method, the panel and the bottom plate are formed by the whole carbonized single plate, the difference in the aspects of material quality, density and the like is small, meanwhile, after the plate is carbonized at high temperature, most of rotten fungi and insects in the wood are killed, nutrient substances in the wood are degraded and destroyed, and various fungi and insects can not be killed by the nutrient substances, so that the dimensional stability, the moisture resistance and the mildew resistance of the wood are improved; meanwhile, the decorative effect of the panel and the bottom plate after carbonization can be comparable with that of precious wood, so that the wood resources are reasonably utilized.
Advantageous effects
The carbonized fiber board disclosed by the invention has a simple preparation process, does not need to improve the existing process, and can be directly used in the production of factories; the core board is used as the core board of the carbonized composite floor base material, so that the moisture and mildew resistance of the core board is improved, and meanwhile, resin and unstable phenolic substances influencing the bonding strength in wood volatilize and decompose, so that the bonding strength of the core board is increased, and the overall strength of the floor is enhanced.
Drawings
FIG. 1 is a schematic structural diagram of a carbonized composite floor substrate, wherein the names of the parts are respectively as follows: 1. panel 2, glue layer (1), 3, core board 4, glue layer (2), 5, bottom board.
Detailed Description
The present invention will be described in detail below with reference to examples to enable those skilled in the art to better understand the present invention, but the present invention is not limited to the following examples.
Unless otherwise defined, terms (including technical and scientific terms) used herein should be construed to have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms used herein should be interpreted as having a meaning that is consistent with their meaning in the context of this specification and the relevant art, and should not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Examples
A production process of an 18mm composite floor substrate comprises the following steps:
1. preparation of panel, core board and bottom board by carbonization
(1) Preparation of the panel: cleaning, peeling and removing impurities of a wood raw material, and cutting the wood raw material into panels with the thickness of 10 mm; drying the panel by using a constant temperature and humidity box to enable the water content of the panel to reach about 10-12%; pushing the neatly placed wood into a carbonization kiln, and sealing a kiln door; raising the temperature in the kiln from room temperature to 75 ℃ at the speed of 7 ℃/h, and keeping the temperature for 1.5 h; then raising the temperature in the kiln from 75 ℃ to 103 ℃, preserving the heat for 2h, and raising the temperature in the kiln to 120 ℃ at a temperature rise speed of 10 ℃/h; gradually increasing to 170 ℃ at the speed of 5 ℃/h and keeping for 1 h; then cooling at 5 ℃/h, cooling at 10 ℃/h when the temperature in the kiln is below 120 ℃, spraying steam into the kiln every 30min, and reducing the humidity in the kiln from 100% to 40-50%; and (4) when the temperature in the heat treatment box is reduced to 80 ℃, closing the heat source, naturally reducing the temperature to room temperature, and then opening the kiln to obtain the carbonized panel.
(2) Preparing a core plate: cleaning, peeling, removing impurities and drying the wood raw material, uniformly dispersing cut wood chips on a stainless steel plate by adopting a special slicer, feeding the wood chips into a carbonization kiln, and sealing a kiln door; the temperature in the kiln is increased from room temperature to 103 ℃ at the speed of 50 ℃/h, and the temperature is kept for 1 h; raising the temperature in the kiln to 180 ℃ at the speed of 40 ℃/h, keeping the temperature for 1h, and spraying steam into the kiln every 5 minutes to ensure that the humidity in the kiln is 100 percent; reducing the temperature in the kiln to 120 ℃ at the speed of 20 ℃/h, spraying water vapor into the kiln every 30min, then closing a heat source, opening a kiln door, naturally cooling to room temperature, and taking out the wood chips; putting the carbonized wood chips into a high-speed crusher to be ground into carbonized wood fiber powder; uniformly mixing the prepared carbonized wood fiber powder and common fibers in a ratio of 6:4, uniformly spraying thermosetting adhesive and emulsified paraffin on the surface of the mixed fibers, wherein the adhesive application amount of the thermosetting adhesive is 80kg/m3The addition amount of the paraffin is 1 percent; drying the mixed material after sizing until the water content is 10-12%; evenly spreading the mixed material in a forming container; sequentially putting the formed containers into a hot press, wherein the hot pressing temperature is 190 ℃, the hot pressing time is 5min, and the hot pressing pressure is 3.5 MPa; releasing pressure by a hot press, cooling the base materials, and then independently stacking, wherein the stacking and tempering time is more than 48 hours; and (5) after sanding, sawing to a plate with the required specification and size.
(3) Preparing a bottom plate: cleaning, peeling and removing impurities of the wood raw material, and rotary cutting the wood raw material into wood veneers with the thickness of 2 mm; and pushing the wood veneer placed orderly into the carbonization kiln, and sealing the kiln door. Raising the temperature in the kiln from room temperature to 90 ℃ at the speed of 20 ℃/h, and keeping the temperature for 0.5 h; raising the temperature in the kiln from 90 ℃ to 103 ℃, and preserving the temperature for 0.5 h; the temperature in the kiln is raised to 120 ℃ at the heating rate of 20 ℃/h, and water vapor is intermittently sprayed into the kiln, so that the humidity in the kiln is 100 percent, and the veneer is prevented from cracking and warping. Gradually increasing to 180 ℃ at the speed of 10 ℃/h and keeping for 1 h; spraying water vapor into the kiln once every 5min to keep the humidity in the kiln at 100%; cooling at a rate of 7 ℃/h, cooling at a rate of 12 ℃/h when the temperature in the kiln is below 120 ℃, spraying steam into the kiln every 30min, and reducing the humidity in the kiln from 100% to 40-50%; and (4) when the temperature in the heat treatment box is reduced to 80-100 ℃, closing the heat source, naturally cooling to room temperature, then opening the kiln, and taking out the veneer.
2. Preparation of composite floor base material
A composite floor base material comprises a panel, a core plate and a bottom plate which are arranged from top to bottom in sequence. The panel is a high-temperature carbonized solid wood board, the core board is composed of a whole fiberboard, and the bottom board is a high-temperature carbonized solid wood veneer;
respectively carbonizing the panel, the core board and the bottom board, then respectively applying thermosetting adhesives and then overlapping in a staggered manner; placing into a hot press for gluing, wherein the hot pressing temperature is 120 ℃, the hot pressing pressure is 12MPa, and the hot pressing time is 25 min; and cooling, sanding to a fixed thickness, processing burrs after gluing and molding, and cutting into a specified size to obtain the composite floor base material.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (10)
1. A preparation process of a carbonized fiber board comprises the steps of carbonized wood fiber preparation → mixed material sizing → drying → paving and forming → hot pressing → cooling → sanding → inspection and sorting → packaging and warehousing, and is characterized in that:
in the preparation step of the carbonized wood fiber, after the wood raw material is cleaned, peeled, impurity-removed, dried and sliced, wood chips are carbonized in a carbonization kiln, the temperature in the carbonization kiln is increased from room temperature to 100-120 ℃ at the speed of 30-50 ℃/h, and the temperature is kept for 1-3 h; raising the temperature in the kiln to 160-220 ℃ at the speed of 40-50 ℃/h, keeping the temperature for 1-3 h, then lowering the temperature in the kiln to 120 ℃ at the speed of 20 ℃/h, closing a heat source, opening a kiln door, naturally cooling to room temperature, and taking out the wood chips; and putting the carbonized wood chips into a high-speed crusher to be ground into carbonized wood fiber powder.
2. The process for producing a carbon fiber sheet according to claim 1, wherein: in the preparation step of the carbonized wood fiber, the temperature in the kiln is increased from room temperature to 105 ℃ at the speed of 30-50 ℃/h, and the temperature is kept for 1.5 h; and then raising the temperature in the kiln to 180 ℃ at the speed of 40-50 ℃/h, and keeping the temperature for 1.5 h.
3. The process for producing a carbon fiber sheet according to claim 1, wherein: in the step of preparing the carbonized wood fiber, the humidity in the kiln is kept at 100 percent.
4. The process for producing a carbon fiber sheet according to claim 1, wherein: in the step of mixing and sizing, mixing the prepared carbonized wood fiber powder with common wood fiber in a proportion of 1: 9-9: 1, the adhesive is uniformly mixed, and the adhesive application amount of the thermosetting adhesive is 80-150 kg/m3。
5. The process for producing a carbon fiber sheet according to claim 1, wherein: the thermosetting adhesive comprises one or more of urea-formaldehyde resin, phenolic resin, isocyanate resin, lignin adhesive and soybean protein adhesive.
6. The utility model provides a carbonization laminate flooring substrate, is panel (1), core (3) and bottom plate (5) from last to being extremely down in proper order, its characterized in that: the panel (1) is a high-temperature carbonized solid wood board, the core board (3) is a carbonized fiber board prepared by the method according to any one of claims 1 to 5, the bottom board (5) is a high-temperature carbonized solid wood single board, the panel (1), the core board (3) and the bottom board (5) are laminated and stacked and are formed by bonding and curing glue layers, the lamination includes staggered or non-staggered stacking, and preferably staggered stacking, and the thickness of the carbonized composite floor base material is 6-18 mm, and preferably 12 mm.
7. The carbonized composite floor substrate of claim 6, wherein: the thickness of panel (1) is 1 ~ 3mm, preferred thickness 3 mm.
8. The carbonized composite floor substrate of claim 6, wherein: the thickness of the bottom plate (5) is 1-2 mm, and the preferable thickness is 1 mm.
9. The carbonized composite floor substrate of claim 6, wherein: the panel (1) is prepared by a carbonization preparation method which comprises ten working procedures of cutting → drying → stacking → entering a kiln → preheating → high-temperature drying → heating → carbonizing → cooling → discharging from the kiln; wherein the content of the first and second substances,
in the preheating step, the temperature in the kiln is increased from room temperature to 70-80 ℃ at the speed of 5-10 ℃/h, and the temperature is kept for 1-2 h;
in the drying step, the temperature in the kiln is raised to 100-105 ℃, and the temperature is kept for 1-2 h;
in the temperature rising step, the temperature in the kiln is raised to 120-140 ℃ at the temperature rising speed of 10-15 ℃/h, and the humidity in the kiln is kept at 100%;
in the carbonization step, gradually increasing the temperature to 160-200 ℃ at the speed of 3-5 ℃/h, and keeping the temperature for 1-3 h, wherein the humidity in the kiln is kept at 100%;
in the cooling step, the temperature in the kiln is cooled at 3-5 ℃/h when the temperature is above 120 ℃, the temperature in the kiln is cooled at 5-10 ℃/h when the temperature is below 120 ℃, steam is sprayed into the kiln every 30min, and the humidity in the kiln is reduced from 100% to 40-50%; when the temperature in the heat treatment box is reduced to 80-100 ℃, the heat source is closed, and the kiln is opened after the temperature is naturally reduced to room temperature.
10. The carbonized composite floor substrate of claim 6, wherein: the preparation method of the soleplate (5) and the carbonization thereof comprises
Cutting → drying → stacking → entering a kiln → preheating → high-temperature drying → heating → carbonizing → cooling → leaving the kiln for ten processes; wherein the content of the first and second substances,
in the preheating step, the temperature in the kiln is increased from room temperature to 70-80 ℃ at a speed of 15-20 ℃/h, and the temperature is kept for 0.5-1 h;
in the drying step, the heat preservation time is 0.5-1 h;
in the temperature rising step, the temperature in the kiln is raised to 120-140 ℃ at the temperature rising speed of 20-30 ℃/h;
in the carbonization step, gradually increasing the temperature to 160-180 ℃ at a speed of 10-15 ℃/h, and keeping the temperature for 1-2 h;
in the cooling step, when the temperature in the kiln is above 120 ℃, cooling is carried out at a speed of 5-10 ℃/h, when the temperature in the kiln is below 120 ℃, cooling is carried out at a speed of 10-15 ℃/h, water vapor is sprayed into the kiln every 30min, and the humidity in the kiln is reduced from 100% to 40-50%; when the temperature in the heat treatment box is reduced to 80-100 ℃, the heat source is closed, and the kiln is opened after the temperature is naturally reduced to room temperature.
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