CN113654305A - Bamboo filament grading circulation drying method, recombined bamboo prepared by same and application of recombined bamboo - Google Patents
Bamboo filament grading circulation drying method, recombined bamboo prepared by same and application of recombined bamboo Download PDFInfo
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- CN113654305A CN113654305A CN202110898157.0A CN202110898157A CN113654305A CN 113654305 A CN113654305 A CN 113654305A CN 202110898157 A CN202110898157 A CN 202110898157A CN 113654305 A CN113654305 A CN 113654305A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
- F26B3/04—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour circulating over or surrounding the materials or objects to be dried
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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Abstract
The invention belongs to the technical field of bamboo processing, and discloses a bamboo filament grading circulation drying method, a prepared recombined bamboo and application thereof, wherein the method comprises the steps of respectively conveying two batches of fresh bamboo filament piles A and B into a hot drying chamber and a cold drying chamber of a drying kiln, wherein the hot drying chamber and the cold drying chamber are adjacent to each other, low-humidity cold air discharged by a heat pump drying system in the hot drying chamber enters the cold drying chamber, and the cold drying quality guarantee treatment is carried out on the bamboo filament pile B in the cold drying chamber by a blower; after the bamboo filament material pile A is treated, the bamboo filament material pile A is transferred out of the hot dry chamber, and then the cold dry bamboo filament material pile B is transferred into the hot dry chamber for drying treatment; and (3) placing the fresh bamboo filament material piles to be treated in the cold drying chamber, and performing circulating treatment according to the conditions of the cold drying chamber and the hot drying chamber in sequence to realize the grading circulating drying of the bamboo filament material piles. The method shortens the drying period by 35-128%, reduces the drying energy consumption by 13-33%, has the advantages of low production energy consumption and high production efficiency, and can realize large-scale continuous production of the recombined bamboo floors.
Description
Technical Field
The invention belongs to the technical field of recombinant bamboo production and processing technology, and particularly relates to a bamboo filament grading circulating drying method, a prepared recombinant bamboo and application thereof.
Background
The recombined bamboo floor has excellent mechanical properties and green environmental protection characteristics, has the properties of water resistance, corrosion resistance and the like, is a typical low-carbon material compared with cement, steel and plastics, meets the requirements of building structures on green low-carbon materials, and opens up a wide development space for building utilization of bamboo materials. However, bamboo filaments as a biomass material contain abundant nutrients such as starch, soluble sugar and protein, and are easy to mildew during storage before drying, and the mildew of the bamboo filaments not only affects the appearance of the recombined bamboo, but also brings health risks, thereby causing economic loss and quality credit crisis to recombined bamboo production enterprises. In addition, with the aggravation of market competition of the recombined bamboo floor, the price of raw bamboo and the cost of labor are continuously improved, the production cost of recombined bamboo is reduced by exploring an efficient and energy-saving production process, the bamboo filament drying process is a key energy consumption process of most of small enterprises, the enterprises generally adopt the constant-temperature drying of the bamboo filaments at the temperature of 60-90 ℃, the drying needs 24 hours until the water content is 7-8%, the problems of long time consumption and high energy consumption of the drying process are reflected, and the large-scale production of the efficient and energy-saving recombined bamboo floor is greatly limited.
At present, few research reports on the drying aspect of bamboo filaments at home and abroad are reported, the bamboo filament drying method mainly aims at the material property of bamboo, and the drying efficiency and the energy consumption are rarely related. In 2016, Chinese patent CN105666623A discloses a drying method of recombinant bamboo filaments, which comprises the following concrete steps: and (3) transferring the bundled bamboo filaments into a sodium bicarbonate solution or a sodium hydroxide solution with the pH value of 9-13 and the mass fraction of 10% for dipping treatment for 1.5-2 h, then naturally dehydrating for 25-40 min, carbonizing for 2.5-4.5 h under the conditions of 130-170 ℃ and the pressure of 2.7-4.5 MPa, and finally drying at 60-70 ℃ until the water content of the bamboo filaments is 6-12%. The method can solve the problems that the existing recombined bamboo filament has long drying period, is easy to mildew and the like, however, the method also has the problems that the drying process is complicated, the reduction of production energy consumption is not facilitated, and the like. 2019, chinese patent CN110940152A discloses a microwave rapid and continuous drying method for bamboo, which comprises the following concrete steps: after the bamboo product processing raw material with the water content of 60-120% is subjected to the working procedures of defibering, wire drawing and the like, the bamboo product processing raw material is dried under the conditions of 10-200 kW of microwave power, 915MHz or 2450MHz of microwave source frequency and 1-10 m/min of microwave processing speed until the water content is 20-40%, and after the balance processing, the water content of the bamboo product is reduced to 8-15% through a drying kiln process or an air drying mode. Although the method effectively shortens the drying time of the bamboo wood, for most of tiny enterprises, the cost of obtaining production equipment is high, and the problem of fermentation and mildew during storage of the bamboo filaments before drying cannot be solved, so the method has defects. In order to avoid the phenomenon of mildew during the storage of the bamboo filaments, improve the production efficiency of the recombined bamboo and reduce the drying energy consumption, the improvement of the bamboo filament drying process is urgently needed.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention firstly provides a bamboo filament grading and circulating drying method, which can realize the quality-guaranteeing and grading drying of the bamboo filaments with fermentation resistance, mildew resistance, rapid drying and low energy consumption.
The invention also provides a method for processing the bamboo filaments into recombined bamboo.
The invention further provides an application of the recombinant bamboo.
The purpose of the invention is realized by the following technical scheme:
a bamboo filament grading circulation drying method specifically comprises the following specific steps:
s1, conveying two batches of fresh bamboo filament piles A and B into a hot drying chamber and a cold drying chamber of a drying kiln respectively, wherein the hot drying chamber and the cold drying chamber are adjacent to each other, a heat pump drying system is arranged in the hot drying chamber, an air feeder is arranged in the cold drying chamber, the distance between the bamboo filament piles A and the inner wall of the hot drying chamber in the hot drying chamber is 0.2-0.3 m, the hot air temperature of the hot drying chamber is set to be 85-95 ℃, the air speed of a circulating fan is set to be 3-4.99 m/s, drying is carried out until the water content is 20-25%, then adjusting the hot air temperature of the hot drying chamber to be 75-85 ℃, the air speed of the circulating fan to be 2-2.99 m/s, carrying out secondary drying treatment on the bamboo filament piles A until the water content is 7-10%, and transferring the bamboo filament piles out of the hot drying chamber;
s2, low-humidity cold air discharged by a heat pump drying system in the hot dry chamber enters a cold dry chamber, and a blower is used for carrying out cold dry quality guarantee treatment on the bamboo filament material pile B in the cold dry chamber; the temperature of the low-humidity cold air is 5-8 ℃ lower than the room temperature, and the relative humidity is 30-40%; the air speed of the air feeder is 5-8 m/s, so that the air speed distribution deviation of each area in the drying chamber is less than 0.5m/s, and the bamboo filament material pile B is dried until the water content is 40-45%;
s3, after the bamboo filament material pile A is processed in the step S1, transferring the bamboo filament material pile A out of the hot dry chamber, and then transferring the cold dry bamboo filament material pile B processed in the step S2 into the hot dry chamber for drying;
s4, placing the fresh bamboo filament material piles to be processed in a cold drying chamber, firstly processing according to the conditions of the step S2, transferring to a hot drying chamber, then processing according to the conditions of the step S1, and sequentially performing circulation processing to realize the grading circulation drying of the bamboo filament material piles.
Preferably, in step S1, the cold drying chamber has a length × width × height (3.8-4.6) mx (2.6-3.6) m, and the hot drying chamber has a length × width × height (3.5-4.5) mx (2.5-3.5) m.
Preferably, the bamboo filament in step S1 is one or more of moso bamboo, green tangerine orange peel bamboo or arrowhead bamboo.
Preferably, the temperature of the hot wind in the step S1 is 90 ℃ and the temperature of the hot wind in the step S2 is 80 ℃.
Preferably, the bamboo filament pile in steps S1 to S4 has a length × width × height (1.4 to 2) mx (0.9 to 1.5) mx (2.1 to 3.1) m; the bamboo filament material pile is stacked with bamboo filaments layer by using partition bars with the thickness of 15-25 mm.
Preferably, the initial water content of the bamboo filaments in the steps S1, S2 and S4 is 60-90%.
Preferably, the room temperature in step S3 is ≧ 12 ℃.
The recombined bamboo is processed by the bamboo filaments prepared by the method.
Preferably, the density of the recombined bamboo is 1.05-1.2 g/cm3The static bending strength is 140-160 MPa, the water absorption width expansion rate is less than or equal to 3%, and the water absorption thickness expansion rate is less than or equal to 10%.
The recombined bamboo is applied to the field of floor, furniture or wall decoration.
The method fully utilizes the low-humidity cold air discharged by the drying system to carry out cold drying and quality guarantee on the fresh bamboo, effectively avoids the fermentation and mildewing phenomena of the fresh bamboo in the storage process, ensures the quality of the fresh bamboo in the storage process, ensures the mechanical strength of the bamboo, and overcomes the defect that the waste gas of the existing drying equipment is wasted in a large amount; the bamboo wood is dried in a grading manner according to the water content, compared with the drying at the constant temperature of 60-100 ℃, the drying period can be shortened by 35-128%, the drying energy consumption is reduced by 13-33%, and the method has the advantages of low production energy consumption, high production efficiency and capability of realizing large-scale continuous production of the recombined bamboo floor. The recombined bamboo prepared from the bamboo filaments by adopting the grading drying technology has higher density, strength and water resistance, and all performances meet the requirements of relevant standards.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention fully utilizes the low-humidity cold air discharged by the evaporator in the heat pump drying system during drying to carry out cold drying quality-guaranteeing treatment on the bamboo filaments with high water content, the cold drying chamber does not need to be provided with a kiln door and is of an open structure, so as to ensure that the moisture evaporated from the bamboo filaments is blown away quickly by high air speed, keep the lower humidity of the cold drying chamber, fully recycle the gas discharged by the drying system to guarantee quality and dry while ensuring that the bamboo filaments are not fermented and mildewed before drying, and provide possibility for enterprises to produce high-quality products and realize high-efficiency utilization of energy. After the bamboo filaments are subjected to cold drying and quality preservation, the fermentation and mildew prevention capability is greatly improved, so that the appearance quality and the product safety of the recombined bamboo are ensured.
2. The invention utilizes the drying kiln moisture content grading drying technology to carry out targeted quick drying on the free water and the combined water in the bamboo filaments, adopts different drying temperatures and wind speeds according to different moisture properties in the bamboo, realizes the high-efficiency energy-saving drying of the bamboo filaments on the premise of not influencing the subsequent production process and the finished product performance of the recombined bamboo, overcomes the technical problems of complex drying process, long drying period and high energy consumption, can realize continuous production, and has good economic benefit.
3. The density of the recombined bamboo prepared by the invention is 1.05-1.2 g/cm3The static bending strength is 140-160 MPa, the water absorption width expansion rate is less than or equal to 3%, the water absorption thickness expansion rate is less than or equal to 10%, and the water absorption composite material can be applied to the fields of floor, furniture or wall decoration and the like.
Drawings
Fig. 1 is a schematic top view of a bamboo filament quality-keeping grading drying kiln according to the present invention.
Fig. 2 is a schematic structural view of stacking of bamboo filaments in a feeding car.
Fig. 3 is a schematic top view of the layout of the bamboo filament drying plant of the present invention.
FIG. 4 is a graph showing the comparison of the drying rate and the energy consumption for treating bamboo filaments by using the two manners of fractional drying and constant temperature drying in example 1.
Detailed Description
The present invention will now be described in detail with reference to specific embodiments, illustrative examples and descriptions of the present invention are provided to explain the present invention without limiting the present invention thereto.
Example 1
The invention relates to a bamboo filament quality-keeping grading drying kiln, which comprises a bamboo filament cold drying chamber and a bamboo filament hot drying chamber connected with the cold drying chamber, wherein the size of the bamboo filament cold drying chamber is 3.8-4.6 m in length, 2.6-3.6 m in width and 2.6-3.6 m in height, the size of the bamboo filament hot drying chamber is 3.5-4.5 m in width and 2.5-3.5 m in height, and a blower 21 is arranged in the bamboo filament cold drying chamber; a heat pump drying system 15 is installed on one side of the bamboo filament hot drying chamber to achieve high-low temperature grading drying, an evaporator 13 in the heat pump drying system 15 is communicated with the cold drying chamber to achieve low-temperature air drying and quality guaranteeing of bamboo filaments in the cold drying chamber, and the cold drying chamber is an open space on one side; four corners in the bamboo filament hot dry chamber are provided with guide plates 11 for uniformly distributing gas, a hanging gate 14 is fixed on one side of the bamboo filament hot dry chamber, a heat pump drying system 15 of the hot dry chamber is connected to a drain pipe 12, the arrow direction is the air flow direction, and the bamboo filaments are conveyed to a drying kiln by a feeding cart.
The invention adopts the drying kiln to carry out grading circulating drying on the bamboo filaments, and the method comprises the following specific steps:
(1) primary drying: using a parting strip with the thickness of 15mm, piling up the moso bamboo filaments with the sizes of 500(L) multiplied by 110(W) multiplied by 10(T) mm and the average water content of 75 percent on a feeding car layer by layer, and transporting to a hot drying chamber. The bamboo filament pile has length of 1.5m, width of 1.1m, height of 2.7m, and distance of 0.3m from the inner wall of the hot drying chamber. The hot air temperature of a heat pump drying system in the hot drying chamber is adjusted to 90 ℃, the air speed of a circulating fan is adjusted to 3.5m/s, and drying is carried out for 1.5 h.
(2) Secondary drying: when the moisture content of the bamboo filaments in the hot drying chamber is reduced to 22%, the hot air temperature of the heat pump drying system is adjusted to 80 ℃, the air speed of the circulating fan is adjusted to 2.5m/s, the bamboo filaments are dried until the moisture content of the bamboo filaments is reduced to 8%, the secondary drying time is 1.1h, and the bamboo filaments are conveyed out of the hot drying chamber.
(3) And (3) cold drying and quality guaranteeing: using a 15mm thick parting strip, stacking a second batch of moso bamboo filaments with the dimensions of 500(L) multiplied by 110(W) multiplied by 10(T) mm and the average water content of 75% on a feeding car layer by layer, and pushing the moso bamboo filaments into a cold drying chamber, wherein the specification of the bamboo filament stack is 1.5m long, 1.1m wide and 2.7m high. The room temperature was 18 ℃. The temperature of low-humidity cold air discharged into the cold drying chamber by a heat pump drying system in the hot drying chamber is 12 ℃, the relative humidity is 34%, the air speed of an air feeder is adjusted to be 6m/s, and the air speed distribution deviation of each area is less than 0.5 m/s. And (5) carrying out cold drying on the bamboo filaments until the water content is 42%, wherein the cold drying time is 2.6 h. And (3) after the secondary drying of the first batch of bamboo filaments in the step (2) is finished, pushing the cold-dried bamboo filaments to a hot drying chamber from a feeding car to sequentially perform primary drying and secondary drying treatment.
(4) And (3) treating the bamboo filaments of the second and later batches according to the steps (3), (1) and (2) to obtain dried bamboo filaments, wherein the moisture content of the bamboo filaments is 7-10%. The average drying rate and total energy consumption of each batch of bamboo filaments in the hot drying chamber were recorded.
The dried bamboo filaments are made into the recombined bamboo with the size of 500mm multiplied by 440mm multiplied by 25mm through processes of gum dipping, drying after gum dipping, assembly hot pressing and the like. The recombined bamboo is cut into standard test pieces with the dimension specification of 50mm multiplied by 25mm and 450mm multiplied by 50mm multiplied by 25mm, and the standard test pieces are used for measuring the water resistance, the static bending strength and the elastic modulus. And a dynamic moisture adsorption instrument (DVS intrinsic, Surface Management Systems, United Kingdom) and a Fourier transform infrared spectrometer (Spectrum 100, Science, China) were used to measure the dynamic moisture adsorption characteristics of the bamboo bundle and the chemical composition of the recombined bamboo, respectively. And (3) soaking the dried bamboo filaments in phenolic resin, controlling the gum dipping amount to be 10-12%, drying the bamboo filaments after gum dipping at 70 ℃ until the water content is 12-14%, then carrying out manual assembly on the obtained blank, and carrying out hot pressing on the blank at 140 ℃ to obtain the recombined bamboo. The density of the recombined bamboo is 1.05-1.2 g/cm3The static bending strength is 140-160 MPa, the water absorption width expansion rate is less than or equal to 3%, and the water absorption thickness expansion rate is less than or equal to 10%.
The results show that: the bamboo filament adopts the speed of grading drying and constant temperature drying and the energy consumption contrast condition: in the process of reducing the water content of the bamboo bundles to 8%, the grading drying speed is between 80 and 90 ℃ and is 16.5%/h, the drying speed is improved by 128% compared with the lowest value of 60 ℃, the total energy consumption is lowest and is 331 kW.h/t, and the total energy consumption is reduced by 33% compared with the highest value of 60 ℃. The water resistance of the recombinant bamboo can reach the relevant standard of the outdoor recombinant bamboo floor of GB/T30364-2013 recombinant bamboo floor, namely the water absorption width expansion rate of the test sample is less than 3%, the water absorption thickness expansion rate is less than 10%, the water absorption width expansion rate is determined that the test sample reaches the excellent product grade, and the water absorption thickness expansion rate is determined that the test sample reaches the qualified product grade. The static bending strength of the recombined bamboo meets the superior product index of a structural laminated veneer lumber of GB/T20241-2006 'laminated single-layer lumber' of 67.5MPa, and the elastic modulus reaches the 140E grade of the structural laminated veneer lumber. The treatment process adopted by the invention has little influence on the equilibrium water content of the impregnated bamboo bundles in the normal-temperature storage process, does not influence the aging process of drying after the glue, and has no obvious influence on the chemical components of the recombined bamboo.
Fig. 2 is a schematic structural view of stacking of bamboo filaments in a feeding car. As shown in FIG. 2, the bamboo filaments are selected from bamboo such as Phyllostachys pubescens, Phyllostachys viridis or Sagittaria sagittifolia. The specification of the bamboo filament pile is length, width and height (1.4-2) mx (0.9-1.5) mx (2.1-3.1) m; the bamboo filaments are stacked layer by layer on a feeding trolley by using partition bars with the thickness of 15-25 mm. Fig. 3 is a schematic top view of the layout of the bamboo filament drying workshop for recombined bamboo. As can be seen from fig. 3, the cold dry chamber and the hot dry chamber are communicated through the evaporator 13, and the number of the cold dry chamber and the hot dry chamber can be increased or decreased according to the drying requirement of the enterprise. FIG. 4 is a graph showing the comparison of drying rate and energy consumption in the manner of treating bamboo filaments by using the fractional drying and the constant temperature drying in example 1. Wherein, (a) is the drying speed of the grading drying and the constant-temperature drying, and (b) is the drying energy consumption of the grading drying and the constant-temperature drying; the stripe column is graded drying, and the blank column is constant temperature drying. As can be seen from FIG. 4, the drying speed of the fractional drying is 16.5%/h at 80-90 deg.C, which is increased by 128% compared with the lowest drying speed of 60 deg.C, and the total energy consumption is 331kW · h/t at the lowest, which is reduced by 33% compared with the highest total energy consumption of 60 deg.C, indicating that the fractional drying speed is higher and the total energy consumption is the lowest.
The method fully utilizes the low-humidity cold air discharged by the drying system to carry out cold drying and quality guarantee on the fresh bamboo, effectively avoids the fermentation and mildewing phenomena of the fresh bamboo in the storage process, ensures the quality of the fresh bamboo in the storage process, ensures the mechanical strength of the bamboo, and overcomes the defect that the waste gas of the existing drying equipment is wasted in a large amount; the bamboo wood is dried in a grading manner according to the water content, compared with the drying at the constant temperature of 60-100 ℃, the drying period can be shortened by 35-128%, the drying energy consumption is reduced by 13-33%, and the method has the advantages of low production energy consumption, high production efficiency and capability of realizing large-scale continuous production of the recombined bamboo floor.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A bamboo filament grading circulation drying method is characterized by comprising the following specific steps:
s1, conveying two batches of fresh bamboo filament piles A and B into a hot drying chamber and a cold drying chamber of a drying kiln respectively, wherein the hot drying chamber and the cold drying chamber are adjacent to each other, a heat pump drying system is arranged in the hot drying chamber, an air feeder is arranged in the cold drying chamber, the distance between the bamboo filament piles A and the inner wall of the hot drying chamber in the hot drying chamber is 0.2-0.3 m, the hot air temperature of the hot drying chamber is set to be 85-95 ℃, the air speed of a circulating fan is set to be 3-4.99 m/s, drying is carried out until the water content is 20-25%, then adjusting the hot air temperature of the hot drying chamber to be 75-85 ℃, the air speed of the circulating fan to be 2-2.99 m/s, carrying out secondary drying treatment on the bamboo filament piles A until the water content is 7-10%, and transferring the bamboo filament piles out of the hot drying chamber;
s2, low-humidity cold air discharged by a heat pump drying system in the hot dry chamber enters a cold dry chamber, and a blower is used for carrying out cold dry quality guarantee treatment on the bamboo filament material pile B in the cold dry chamber; the temperature of the low-humidity cold air is 5-8 ℃ lower than the room temperature, and the relative humidity is 30-40%; the air speed of the air feeder is 5-8 m/s, so that the air speed distribution deviation of each area in the drying chamber is less than 0.5m/s, and the bamboo filament material pile B is dried until the water content is 40-45%;
s3, after the bamboo filament material pile A is processed in the step S1, transferring the bamboo filament material pile A out of the hot dry chamber, and then transferring the cold dry bamboo filament material pile B processed in the step S2 into the hot dry chamber for drying;
s4, placing the fresh bamboo filament material piles to be processed in a cold drying chamber, firstly processing according to the conditions of the step S2, transferring to a hot drying chamber, then processing according to the conditions of the step S1, and sequentially performing circulation processing to realize the grading circulation drying of the bamboo filament material piles.
2. The bamboo filament grading circulation drying method according to claim 1, wherein the cold drying chamber has a length × width × height (3.8-4.6) mx (2.6-3.6) m, and the hot drying chamber has a length × width × height (3.5-4.5) mx (2.5-3.5) m in step S1.
3. The method of claim 1, wherein the bamboo filaments obtained in step S1 are selected from one or more of moso bamboo, green tangerine orange peel bamboo and arrowhead bamboo.
4. The bamboo filament classifying and circulating drying method according to claim 1, wherein the temperature of the hot wind in the step S1 is 90 ℃ and the temperature of the hot wind in the step S2 is 80 ℃.
5. The method for drying bamboo filaments by stages and circulation according to claim 1, wherein the size of the bamboo filament pile in steps S1 to S4 is (1.4 to 2) mx (0.9 to 1.5) mx (2.1 to 3.1) m; the bamboo filament material pile is stacked with bamboo filaments layer by using partition bars with the thickness of 15-25 mm.
6. The bamboo filament classifying and circulating drying method according to claim 3, wherein the initial moisture content of the bamboo filaments in the steps S1, S2 and S4 is 60-90%.
7. The bamboo filament grading circulation drying method according to claim 3, wherein the room temperature in step S3 is 12 ℃ or higher.
8. A reconstituted bamboo, characterized in that it is processed from bamboo filaments obtained by the method of any one of claims 1 to 7.
9. The reconstituted bamboo according to claim 8, wherein the reconstituted bamboo has a density of 1.05-1.2 g/cm3The static bending strength is 140-160 MPa, the water absorption width expansion rate is less than or equal to 3%, and the water absorption thickness expansion rate is less than or equal to 10%.
10. Use of the reconstituted bamboo according to claim 8 or 9 in the field of floor, furniture or wall finishing.
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