CN112025899A

CN112025899A - Production method for surface layer rolling energy storage densification of wood and obtained wood

Info

Publication number: CN112025899A
Application number: CN202010945328.6A
Authority: CN
Inventors: 唐天宁; 唐君畏; 黄建华
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-10
Filing date: 2020-09-10
Publication date: 2020-12-04

Abstract

The invention discloses a method for producing a surface layer of wood through rolling, energy storage and densification and the obtained wood, which comprise the following steps: s1, rolling the wood through a roller press; s2, putting the wood into a shaping device with the functions of electrically heating a thin plate and locking; s3, feeding the shaping device into a pressure container, introducing compressed air, and simultaneously electrifying and heating the heating thin plate; s4, maintaining the pressure of the container at 0.7-0.8 MPa, raising the temperature of the wood to 160-180 ℃, reducing the temperature to normal pressure after heating and pressurizing are finished, and taking out the shaping device. The invention utilizes the characteristic that the kinetic energy of the press roll is converted into the potential energy of wood cell deformation by rolling the wood, the rolled and compressed wood is placed between the electric heating sheets in a layered mode and is electrified and heated, the energy stored when the cells are rolled and deformed can be released by the wood on the inner layer to compress the softened surface layer wood again, and the two compressed woods with different surface densities can also be obtained. The finally obtained rolled densified wood has a smooth and clean surface, and the problems of the existing wood processing technology are solved.

Description

Production method for surface layer rolling energy storage densification of wood and obtained wood

Technical Field

The invention relates to the technical field of wood processing, in particular to a production method for rolling, storing and compacting a surface layer of wood and the obtained wood.

Background

The wood is one of the most widely used materials for the long time in the human society, the performance of the wood is closely related to the density of the wood, the density is improved by compression to meet the requirements of people on production, life and even military, the wood is an effective method for nearly one hundred years, but the existing method has low production efficiency and high energy consumption, so that the cost is high, the cost performance is low, and the market competitiveness is lacked. For example, the compressed wood floor produced by cryptomeria fortunei in Japan has a price equivalent to RMB of over 800-. Has been priced in comparison to tropical hardwood floors, which necessarily impacts market acceptance. At present, high-quality wood resources are quite lack, the improvement of the performance of low-grade artificial forest wood by scientific technology to meet the needs of society becomes a consensus, a compression and densification technology is one of the most main methods, the improvement of production efficiency, the reduction of cost and the improvement of cost performance are key, so people make great efforts, and one method is to change the overall compression and densification into surface layer compression and densification to save wood, such as patents CN101966713A, CN101603623A, CA106217566A and the like, and earlier some Japanese patents exist; the other method is to improve the compression and compaction of the surface layer of only one side on the basis of the compaction technology of the surface layers of both sides of the wood board, thereby further saving energy and materials.

In recent years, the patents in this area continuously appear, a small amount of products are available, and an exemplary production line is established, but in general, the market acceptance is still low, the efficiency and the cost are not fundamentally changed, and the cost performance is not high enough, and the reasons are mainly three points:

1. the principle of the surface layer and the layered compression densification is based on that the wood is selectively compressed through hydrothermal action, water and heat reach the designated position of the wood in a certain time to soften the part of the wood, and then the part of the wood is compressed more to become dense under the action of external force, so that the wood needs to be dried to relatively lower moisture content and then both ends of the wood are sealed by hydrophobic substances, because the longitudinal water transmission of the wood is far higher than the transverse water transmission, the interior of the wood is easy to enter too much water, then the dried and end-sealed wood is immersed in the water, and the water is immersed into the wood through the side surface, which is time-consuming, and sometimes even nicks on the side surface are needed to accelerate the water immersion speed;

2. the soaked wood is preheated and compressed by high temperature of more than one hundred degrees on the hot press and cannot be taken out immediately, and the water and heat in the wood can cause the wood to expand and rebound, so that the hot press plate and the compressed wood need to be forcibly cooled until the wood cannot rebound again in order to save time. The hot pressing plate needs to be heated again in the next period, and the circulation is repeated, so that the energy consumption is greatly increased;

3. the compressed wood needs to be set to limit its return to its original shape, and a chemical method, a heat treatment method and a heat steam treatment method are generally used. The former two have problems of environmental protection and long time. Therefore, the present multi-purpose heat steam treatment method is that the compressed and densified wood to be treated is heated and set in a pressure container under the conditions of low oxygen and clamping by hot steam convection contact for at least several hours.

From the above three points, when the wood is repeatedly changed between dry, wet, cold and hot, the time and energy consumption are inevitably increased, and the efficiency is difficult to be greatly improved and the cost is reduced.

Disclosure of Invention

The invention aims to: aiming at the existing problems, the method for producing the densified wood surface layer through rolling energy storage is provided, the surface layer of the wood is densified through rolling the wood, meanwhile, the kinetic energy of a pressing roller is converted into the potential energy of wood cell deformation, the rolled and densified wood is placed between electric heating sheets in a layered mode, the electric heating is carried out after locking, the surface layer wood is softened when transferring heat inwards, the energy stored when the cells are rolled and deformed is released to compress the softened surface layer wood again when the inner layer wood is heated, the finally obtained rolled and densified wood is smooth and clean in surface, and the problems existing in the existing wood processing technology are solved.

The technical scheme adopted by the invention is as follows: the production method for the surface layer rolling energy storage densification of the wood is characterized by comprising the following steps of:

s1, rolling the wood with the water content of 18-20% by a roller press;

s2, putting the rolled wood into a shaping device with electric heating thin plate and locking function;

s3, feeding the locked shaping device filled with wood into a pressure container, closing the pressure container, introducing compressed air, and simultaneously electrifying and heating the heating thin plate;

s4, maintaining the pressure of the container at 0.7-0.8 MPa, raising the temperature of the wood to 160-180 ℃, keeping the temperature for 10-30 min, then cutting off the power and exhausting the gas, reducing the pressure to the normal pressure within 30min, and then taking out the shaping device.

In the method, because the wood is an anisotropic natural polymer material, cells are easy to deform and not easy to damage under the action of transverse external force, and the deformation and the original shape are easy to recover under the action of water and heat, the characteristic exists as an adverse factor to be overcome in the prior art of wood compression densification, for example, the wood needs to be soaked in water for heating and softening before compression, and the hot pressing plate can be loosened after cooling after compression, so that the time and energy are consumed, and the defects mainly existing in the prior wood processing technology are overcome. The method of the invention is to overcome the problems, firstly, the wood is rolled, the cold roll compression replaces the hot flat pressing after the water heating softening, the efficiency is increased by multiple times, the energy consumption is reduced by multiple times, then the rolled and compressed wood is layered between the electric heating sheets, the electric heating is carried out after the locking, the surface layer wood is softened when transferring heat inwards, the energy stored when the cells are rolled and deformed can be released to compress the softened surface layer wood again when the inner layer wood is heated, the heat efficiency is high, the heat energy is concentrated in the wood, meanwhile, the heating and pressurizing shaping treatment is realized by the pressure container, the temperature of the pressure container only needs to keep dozens of degrees, the surface of the finally obtained rolled and compressed wood is flat and smooth, the thickness of the compression layer is 2-3 mm, the surface layer density can be improved by 50-90%, the uniformity, the gradient is small, the water absorption and moisture absorption recovery rate is lower, the density of the surface layers on the two sides can be 20-40% different according to the needs, the process flow is simple, the energy consumption and the use cost are low, the processing quality of the product is excellent, and the method is obviously superior to the traditional wood processing technology.

In order to realize automatic and continuous production, the processed shaping device in the pressure container is replaced by other shaping devices loaded with rolled wood, a new round of heating and pressurizing shaping treatment is carried out, and the operation is repeated until a production task is completed.

In the invention, in order to further realize continuous production, the taken out processed shaping device is naturally cooled to 50-60 ℃, and then the wood is taken out by a stacker crane or manpower and returned for reuse.

Further, in S1, the rolling speed of the roller press is 4-6 m/min, and the wood compressibility is 10-30%.

Further, the temperature rise speed is 1-3 ℃/min before the temperature of the wood rises to 100 ℃, and the temperature rise speed is 0.5-1 ℃/min after the temperature reaches 100 ℃. The wood temperature is based on the thermocouple temperature set by the setting device.

In the invention, when the pressure in the container is close to normal pressure, the oxygen in the container is less, the container is filled with water vapor discharged by wood, the water content of the wood is generally 8-10%, and the wood can be continuously electrified and heated for carbonization heat treatment when the temperature of the wood is still above 100 ℃.

In the invention, in order to better implement the shaping device, the shaping device comprises an upper pressing plate and a lower pressing plate which are arranged up and down symmetrically, the left end and the right end of the upper pressing plate and the right end of the lower pressing plate are connected through a left pillar and a right pillar respectively, the upper pressing plate, the lower pressing plate, the left pillar and the right pillar form a frame structure together, electric heating thin plates are arranged in the frame structure, the electric heating thin plates are stacked layer by layer along the up-down direction, a space for containing wood is reserved between the adjacent electric heating thin plates, the electric heating thin plates are connected with a power supply through wires, the two ends of the upper pressing plate are connected with the upper ends of the left pillar and the right pillar through locking screw rod assemblies respectively, and the distance between the upper pressing plate and the. The rolled and compressed wood is placed between the electric heating thin plates in a layered mode, the electric heating is carried out after the locking, the electric heating thin plates are used for contact heating, the heat efficiency is high, the heat energy is concentrated in the wood, the environment is protected, the cleaning is realized, no water is used, no pollution is caused, and the problems of the traditional shaping device are solved.

In the present invention, at least 1 layer of the rolled wood, preferably 2 layers, may be placed in the space between the adjacent electrically heated sheets. One layer of rolled wood can be arranged between every two electric heating thin plates, or two or more layers of the rolled wood can be arranged between every two electric heating thin plates, the thickness and the degree of densification of one side of the wood, which is in direct contact with the electric heating thin plates, are the largest, the wood with different densification of two side surfaces can be obtained, and the difference is related to the thickness of the wood and the temperature rise speed during the shaping treatment.

Further, when two layers of rolled wood are placed between adjacent electric heating thin plates, wood with different densities on two surfaces can be obtained.

Preferably, the electric heating thin plate is formed by a plurality of metal sheets in parallel, two ends of each metal sheet are respectively fixed in series through an upper connecting rod and a lower connecting rod, and ends of the upper connecting rod or/and the lower connecting rod form a lead connecting end; an insulating layer is arranged between the metal sheets, and the ends of the metal sheets are connected through a conductive connecting part which can conduct electricity to form a series circuit.

Preferably, the lower end of the left pillar is hinged to the lower pressing plate, the upper end of the left pillar is fixedly connected with the left end of the upper pressing plate through a locking screw assembly, the lower end of the right pillar is fixedly connected with the lower pressing plate, the upper end of the right pillar is provided with the locking screw assembly, the right end of the upper pressing plate is provided with a buckle portion, and the buckle portion of the upper pressing plate is sleeved on the locking screw assembly.

In the invention, the size and the species of each batch of wood are kept consistent, and the number of the electrically heated thin plates in the shaping device corresponds to the number of the wood.

In the method for producing the surface layer rolled energy storage densification of the wood, a plurality of sets of shaping devices are arranged to ensure the continuity of the whole production flow, and the production capacity of a specific quantity production line is matched, for example, a roller press with the speed of 5m/min can process 1m of wood with the specification and thickness of 2cm per hour³Or 2m of wood with the thickness of 4cm³. Pressure vessel 1.8m in diameter and 4.5m long, capable of handling 4m each time³Period of 2-4 h, produced during continuous productionThe number of devices to be shaped is: the 1m long shaping device needs 12 sets (4 sets in the pressure container, 4 sets in the loading and unloading wood and 4 sets in the state to be cooled), 6 sets in 2m long and 3 sets in 4m long.

The invention also comprises wood which is produced by the production method for rolling, storing energy and compacting the surface layer of the wood.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. the invention utilizes the characteristics that the surface layer of the wood is compacted by rolling the wood, and simultaneously, the kinetic energy of the press roll is converted into the potential energy of the wood cell deformation, the rolled and compacted wood is layered and placed between electric heating sheets, the electric heating is carried out after the locking, the surface layer wood is softened when transferring heat inwards, the energy stored when the cell is rolled and deformed can be released to compress the softened surface layer wood again when the inner layer wood is heated, finally, the obtained rolled and compacted wood has flat and smooth surface, the thickness of the compressed layer is 2-3 mm, the surface layer density can be improved by 50-90 percent, the uniformity and the gradient are small, the water absorption and moisture absorption recovery rate is lower, the density of the surface layers on the two sides can be 20-40% different according to the needs, the process flow is simple, the energy consumption and the use cost are low, the processing quality of the product is excellent, and the method is obviously superior to the traditional wood processing technology;

2. the process flow and the process equipment related by the invention are simple and compact, small in floor area, large in production capacity, low in energy consumption, low in production cost, environment-friendly and clean, free of water and pollution, easy for highly automated and continuous production and good in production benefit.

Drawings

FIG. 1 is a schematic view of a setting device according to the present invention;

FIG. 2 is a schematic view of an electrically heated sheet of the present invention;

FIG. 3 is a schematic view of the flow structure of a production facility for rolling, storing and compacting the surface layer of wood according to the present invention;

the labels in the figure are: 1 is a roller press, 2 is a wood shaping device, 201 is an upper press plate, 202 is a lower press plate, 203 is a left support, 204 is a right support, 205 is an electric heating thin plate, 206 is a metal sheet, 207 is an upper connecting rod, 208 is a lower connecting rod, 209 is a conducting wire connecting end, 210 is a conducting connecting part, 211 is a locking screw rod component, 212 is a shelf, 213 is a ring buckling part, 214 is a roller and 3 is a pressure container.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1, a shaping device 2 includes an upper pressing plate 201 and a lower pressing plate 202 which are arranged vertically symmetrically, the left and right ends of the upper pressing plate 201 and the lower pressing plate 202 are connected through a left pillar 203 and a right pillar 204 respectively, that is, the two ends of the left pillar 203 are connected with the left ends of the upper pressing plate 201 and the lower pressing plate 202 respectively, the two ends of the right pillar 204 are connected with the right ends of the upper pressing plate 201 and the lower pressing plate 202 respectively, the upper pressing plate 201, the lower pressing plate 202, the left pillar 203 and the right pillar 204 together form a frame structure, that is, a rectangular or quasi-rectangular frame structure is formed, electric heating thin plates 205 are arranged in the frame structure, the electric heating thin plates 205 are stacked up and down, a space for accommodating wood is left between adjacent electric heating thin plates 205, and the electric heating thin plates 205 are. The wood is placed in the space between the electrically heated sheets 205, and the layers are stacked one on top of the other as required, and then the stacked wood is subjected to a setting treatment by the assembled frame structure.

Further, in order to facilitate the wood on the electric heating sheet 205 to be pressurized by the compressed air, the electric heating sheet 205 is formed by a plurality of metal sheets 206 side by side, as shown in fig. 2, two ends of the metal sheets 206 are respectively fixed in series by an upper link 207 and a lower link 208, an end of the upper link 207 or/and the lower link 208 constitutes a wire connection end 209, and in the case of the electric heating sheet 205 shown in fig. 2, two ends of the upper link 207 constitutes a wire connection end 209. Preferably, the metal sheet is a stainless steel sheet, although other metal materials may be used instead.

Further, in order to facilitate the electrical heating of the electrical heating thin plates 205 and avoid the occurrence of electric leakage and electric shock as much as possible, an insulating layer (not shown) is disposed between the metal sheets 206, the ends of the metal sheets 206 are connected by a conductive connection portion 210 capable of conducting electricity to form a series circuit, taking fig. 2 as an example, the upper end of the first vertically disposed metal sheet 206 at the left end is connected with the wire connection end 209 of the upper connection rod 207, the lower end thereof is connected with the lower end of the second adjacent vertically disposed metal sheet 206 by a conductive connection portion 210, the upper end of the second metal sheet 206 is connected with the upper end of the third adjacent metal sheet 206 by a conductive connection portion 210, and so on, the plurality of metal sheets 206 are connected by the conductive connection portion 210 to form a series circuit. The conductive connection portion 210 is preferably an aluminum sheet, but other conductive materials may be used instead.

Further, to facilitate the detachment and installation of the electric heating thin plate 205 and to facilitate the application of pressure to the electric heating thin plate 205, the two ends of the upper pressing plate 201 are connected to the upper ends of the left and

right supports

203 and 204 through the locking screw assemblies 211, respectively, and the distance between the upper pressing plate 201 and the lower pressing plate 202 is adjusted through the locking screw assemblies 211. The locking screw assembly 211 may be a common locking screw and a common locking screw assembly, and for example, the common locking screw assembly includes a locking screw, a nut, and other components, and the upper pressing plate 201 may be detached and mounted by the locking screw, so as to facilitate detachment and mounting of the electric heating sheet 205, and simultaneously, the distance between the upper pressing plate 201 and the lower pressing plate 202 may be adjusted, so as to adjust the pressure applied by the upper pressing plate 201 and the lower pressing plate 202 to the electric heating sheet 205.

Further, a shelf 212 is arranged on the upper pressure plate 201, and the electric heating sheet 205 is hung on the shelf 212.

As a preferred embodiment, as shown in fig. 1, the lower end of the left pillar 203 is hinged to the lower press plate 202, the upper end of the left pillar 203 is fixedly connected to the left end of the upper press plate 201 through a locking screw assembly 211, the lower end of the right pillar 204 is fixedly connected to the lower press plate 202, the upper end of the right pillar 204 is provided with the locking screw assembly 211, the right end of the upper press plate 201 is provided with a buckle 213 (preferably a U-shaped member), the buckle 213 of the upper press plate 201 is sleeved on the locking screw assembly 211 at the upper end of the right pillar 204, and the bottom of the lower press plate 202 is provided with a roller 214 to facilitate pushing the wood shaping device. When the electric heating device works, the upper pressing plate 201 can be turned around the lower pressing plate 202 through the left support column 203, so that the electric heating thin plate 205 is hung on the shelf 212, then wood is placed layer by layer, after the set number of layers is reached, the upper pressing plate 201, the left support column 203 and the right support column 204 are locked and fixed through the locking screw rod assembly 211, then the upper pressing plate is pushed into the pressure container 3, pressurized by compressed air and heated by electricity, and shaping treatment is carried out.

The invention also comprises a production device for rolling, storing and compacting the surface layer of the wood, as shown in fig. 3, the production device comprises a roller press 1, a wood shaping device 2 and a pressure container 3, the roller press 1 is used for rolling the wood, the wood shaping device 2 is the wood shaping device, the rolled wood is shaped, and the pressure container 3 is used for pressurizing the wood. The cold roll compression replaces the hot flat pressing after the water-heating softening, the efficiency is increased by several times, the energy consumption is reduced by several times, the rolled and compacted wood is put between the electric heating sheets 205 in a layered manner, the locking is carried out and the electric heating is carried out in the pressure container 3, the surface layer wood is softened when transferring heat inwards, the energy stored when the cell is rolled and deformed can be released when the inner layer wood is heated to compress the softened surface layer wood again, the finally obtained rolled and compacted wood has a flat and smooth surface, the thickness of the compression layer is 2-3 mm, the surface layer density can be improved by 50-90 percent, the uniformity and the small gradient are achieved, the water absorption and moisture absorption recovery rate is low, the equipment is compact, the high automation is easy, the equipment cost is low, and a factory building with the annual production of tens of hundreds of square meters can be formed³The productivity of (1). Further, the above-mentioned roller press may adopt an existing wood roller press, for example, the roller press mold of the inventor's prior patent CN206426238U may be used, and the pressure container is used for accommodating the wood shaping device and forming the closed space, and for providing compressed air into the closed space, so that a general pressure container with a suitable size and specification may be adopted.

Further, the production method for the surface layer rolling energy storage densification of the wood comprises the following steps:

s1, rolling the wood with the water content of 18-20% by a roller press 1;

s2, loading the rolled wood into a shaping device 2;

s3, feeding the shaping device 2 which is filled with wood and locked into a pressure container 3, closing the pressure container 3, introducing compressed air, and electrifying and heating the heating thin plate;

s4, maintaining the pressure of the container at 0.7-0.8 MPa, raising the temperature of the wood to 160-180 ℃, keeping the temperature for 10-30 min, then cutting off the power and exhausting the gas, reducing the pressure to the normal pressure within 30min, and then taking out the shaping device 2.

In the method, when continuous production is needed, the processed shaping device in the pressure container is replaced by other shaping devices loaded with rolled wood, then a new round of heating and pressurizing shaping treatment is carried out, and the operation is repeated until a production task is completed.

Further, the temperature rise speed is 1-3 ℃/min before the temperature of the wood rises to 100 ℃, and the temperature rise speed is 0.5-1 ℃/min after the temperature reaches 100 ℃. The wood temperature is based on the thermocouple temperature set by the setting device 2. The size of each batch of wood is consistent with the tree species, and the number of the electrically heated sheets in the shaping device corresponds to the number of the wood.

In order to better carry out the invention, the following examples are listed:

example (c): producing 19mm geothermal floor blank, wherein the surface layer density is required to reach 0.7-0.8 g/cm³And the thickness is 3mm, and the water absorption thickness expansion rate after soaking in water for 48 hours is less than or equal to 3 percent.

The production method for the surface layer rolling, energy storage and densification of the wood of the blank comprises the following steps:

s1, preparing materials: water content of 18-20%, 1mx13cm (length X width), chord cutting plate

23mm (thickness) of eucalyptus grandis and 24mm of poplar

23mm masson pine and 23mm birch

Paulownia 26mm and cryptomeria fortunei 25mm

The pitch is not more than half of the plate thickness;

s2, rolling: the wood of the same tree species with the same specification can be pressed each time, the speed of the compression roller is 5m/min, the distance between the upper row of compression rollers and the lower row of compression rollers is set to be 1mm smaller than the thickness of the wood at the inlet, and the adjustment is carried out within 15-17 mm of the outlet, so as to ensure that the thickness of the rolled wood is 19 +/-0.1 mm;

s3, assembling and disassembling a shaping device:

a pressure container with the diameter of 1m, wherein the overall dimension of a shaping device is 105cm (length) X72cm (width) X72cm (height), the shaping device consists of an upper pressing plate and a lower pressing plate which are locked by bolts, the upper pressing plate can be turned over so as to facilitate the stacking and taking out of electric heating sheets and wood, the electric heating sheets are formed by connecting stainless steel sheets with the dimension of 720mm (length) X100mm (width) X0.3mm (thickness) in series side by side, stacking is started from the lower pressing plate, two layers of wood are stacked on one electric heating sheet, each layer comprises 5 rolled wood, the total number of 10 rolled wood is 10, one shaping device can stack 13 electric heating sheets, and the total number of 120 rolled wood can be stacked;

s4, shaping

And (3) feeding the locked shaping device loaded with the rolled wood into a pressure container along a track, connecting a detection and power supply, closing the door, introducing compressed air, and electrifying and heating. The temperature rise is 1-3 ℃/min per minute before the wood temperature is 100 ℃, 1 ℃/min after the wood temperature is 100 ℃, the temperature rise speed can be influenced by the environmental temperature and the wood type, the time range of 30-100S can be adopted for convenient operation, different on-off time is controlled, the speed of the temperature rise speed influences the densification degree of the surface layers on two sides of the wood, the temperature rise is generally slow, the densification degree of the surface layer of the wood directly contacted with a heating plate is higher, the pressure in a container is kept at 0.7-0.8 Mpa, the wood temperature reaches 160-.

Detecting the surface rolled energy storage densified wood:

1) the surface density is detected by an X-ray section density analyzer, and a micrometer balance and a digital display vernier caliper are used for directly measuring the density, so that the device is more convenient and practical. The specific method comprises the following steps: firstly, preparing a sample into 20mmX20mmX19mm, weighing, measuring the thickness between two opposite compression surfaces, then removing one surface of the sand with the thickness of 1mm, weighing and measuring, calculating the density of the surface layer with the thickness of 1mm, and repeating the operation in the same way to obtain the density of the corresponding surface layer with the thickness of the other surface and the density of wood with the thickness of 2mm or 3mm of the surface layers of the two surfaces;

2) the water absorption recovery rate, the size of the test piece is 20mmX20mmX19mm, the test piece is soaked in water for 48 hours, the test piece is taken out and placed in an air-dry state, the test piece is dried for 4 hours at the temperature of 60 ℃ and dried to an absolute dry state at the temperature of 103 ℃, the thickness of the test piece is measured, and the test piece is calculated according to the following calculation formula of the water absorption recovery rate:

the water absorption recovery rate is calculated by the formula:

the results of the measurements are shown in the following table:

TABLE 1 test data

Note: 1. the front surface refers to the surface which is directly contacted with the electric heating sheet;

2. the density difference between the core material of cryptomeria fortunei and the sapwood is large, and the core material and the sapwood should be treated separately.

As can be seen from Table 1, the surface density of the obtained wood lumber material satisfies 0.7 to 0.8g/cm³Up to 0.9g/cm³The water absorption thickness recovery rate is below 3%, and the product requirements are met, so that the process method can produce products meeting the market requirements under the conditions of low cost, low energy consumption and low pollution, can realize continuous production, is easy for highly automatic and continuous production, and has high production benefitIs obviously superior to the prior traditional wood processing technology.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. The production method for the surface layer rolling energy storage densification of the wood is characterized by comprising the following steps of:

s1, rolling the wood with the water content of 18-20% by a roller press;

2. The method for producing surface rolled energy storage densification of wood as claimed in claim 1 wherein, after replacing the processed shaping device in the pressure vessel with another shaping device loaded with rolled wood, a new cycle of heat and pressure shaping is performed and the operation is repeated until a production task is completed.

3. The method for producing the surface layer rolled energy storage densification of the wood as claimed in claim 2, wherein the removed processed setting device is naturally cooled to 50-60 ℃, and then the wood is removed by a stacker crane or manually and returned for reuse.

4. The production method for surface rolling energy storage densification of wood according to claim 3, wherein the temperature rise rate is 1-3 ℃/min before the temperature of the wood is raised to 100 ℃, and the temperature rise rate is 0.5-1 ℃/min after the temperature is raised to 100 ℃.

5. The production method for rolling, storing and compacting the surface layer of the wood according to claim 1, wherein the shaping device comprises an upper pressing plate and a lower pressing plate which are arranged symmetrically up and down, the left end and the right end of the upper pressing plate and the lower pressing plate are connected through a left pillar and a right pillar respectively, the upper pressing plate, the lower pressing plate, the left pillar and the right pillar together form a frame structure, electric heating sheets are arranged in the frame structure, the electric heating sheets are stacked up and down, a space for accommodating the wood is reserved between the adjacent electric heating sheets, the electric heating sheets are connected with a power supply through a wire, the two ends of the upper pressing plate are connected with the upper ends of the left pillar and the right pillar through locking screw assemblies respectively, and the distance between the upper pressing plate and the lower pressing plate is adjusted through the locking screw assemblies.

6. The method for producing the surface rolled energy storage densification of the wood according to claim 5, wherein at least 1 layer of rolled wood can be placed in the space between the adjacent electric heating sheets, and when two layers of wood are placed, the wood with different densities on two sides can be obtained.

7. The production method for rolling, storing and densifying the surface layer of the wood according to claim 6, wherein the electrically heated thin plate is formed by a plurality of metal thin plates side by side, two ends of the metal thin plates are respectively fixed in series by an upper connecting rod and a lower connecting rod, and the ends of the upper connecting rod or/and the lower connecting rod form a wire connecting end; an insulating layer is arranged between the metal sheets, and the ends of the metal sheets are connected through a conductive connecting part which can conduct electricity to form a series circuit.

8. The production method for surface rolling energy storage densification of wood according to claim 8, wherein the lower end of the left pillar is hinged to the lower pressing plate, the upper end of the left pillar is fixedly connected to the left end of the upper pressing plate through a locking screw assembly, the lower end of the right pillar is fixedly connected to the lower pressing plate, the upper end of the right pillar is provided with the locking screw assembly, the right end of the upper pressing plate is provided with the ring buckling part, and the ring buckling part of the upper pressing plate is sleeved on the locking screw assembly.

9. The method for producing surface rolled energy storage densification of wood as claimed in claim 1 wherein the wood in each batch is of uniform size, the density of the tree species is similar, and the number of electrically heated sheets in the setting device corresponds to the number of wood species loaded.

10. A densified wood, characterized by being produced by the surface-rolling energy-storage densification production method of wood according to any one of claims 1 to 9.