Method for producing linear wood

Abstract

The present application provides a method for preparing a linear wood material, comprising: twisting a wood material raw material from which lignin and hemicellulose are removed to produce a flexible linear wood material; and repeatedly passing the linear wood material through an opening of a mold to significantly improve the density of the linear wood material while keeping the shape of each cross section of the linear wood material perpendicular to the extension direction of the linear wood material fixed. The method for preparing a linear wood material of the present application solves the problem that the wood material in the prior art is not suitable for being used as a continuous fiber\wire material.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wood preparation, in particular, to a method for preparing linear wood. BACKGROUND

[0002] In recent years, natural fiber reinforced materials have developed very rapidly in the field of composite materials, and the research on wood-based fiber reinforced materials is limited, especially wood fiber reinforced materials of fiber and wire. Due to the internal pores, lignin and hemicellulose in the structure of wood, the performance of wood is poor and it is difficult to balance the high-end application of reinforced materials. On the one hand, the mechanical properties do not reach the level of reinforced materials, and on the other hand, wood is a rigid material, and its flexibility is completely different from carbon fiber and other materials. Such wood does not have the processing performance of continuous reinforced woven fabric.

[0003] At present, many studies use the most common means in wood processing field-deli lignin treatment of wood raw materials, and then combine with resin to design wood composites. However, the performance of treated wood is limited, and the main reasons are as follows:

[0004] Firstly, wood has better flexibility in high humidity state (water content at least > 20%, preferably > 50%) to facilitate the processing of composite materials.

[0005] Secondly, due to the limitation of internal structure, excessive deformation will damage the structure and cause material defects.

[0006] Therefore, the mechanical performance of wood processed by the above method is not ideal, and the humid wood is prone to shrinkage and cracking during subsequent drying process, which further affects the mechanical performance, so it is not suitable for reinforced materials.

[0007] In addition, the prior art can also treat wood raw materials by high temperature steam to make wood soft in high humidity state and improve the deformation freedom. This treatment method also causes shrinkage and cracking problems in the subsequent drying process, and the performance of the processed product is also general. In addition, some wood processing is treated by physical or chemical means, and the mechanical performance effect can be achieved by adding other materials and using high pressure mold. The disadvantage is that other materials must be added, and high pressure molding is a dangerous operation with complex operation and high cost. In addition, the processing and application of many reinforced materials need to be carried out in special protective state, such as the processing and production of carbon fiber and glass fiber, which have high requirements, because the properties of these materials themselves pose a great threat to the health of production personnel. SUMMARY

[0008] The main object of the present application is to provide a method for preparing linear wood to solve the problem that wood is not suitable for continuous fiber\wire as reinforcing material in the prior art.

[0009] In order to achieve the above object, according to one aspect of the present application, a method for preparing linear wood is provided, comprising: preparing a wood raw material from which lignin and hemicellulose are removed into linear wood; and repeatedly passing the linear wood through an opening of a mold so that the linear wood is extruded when passing through the opening until the shape of each cross section of the linear wood perpendicular to the extending direction thereof is fixed.

[0010] Further, the method for repeatedly passing the linear wood through the opening of the mold so that the linear wood is extruded when passing through the opening until the shape of each cross section of the linear wood perpendicular to the extending direction thereof is fixed comprises: repeatedly passing the linear wood through an opening in a circular shape until the shape of each cross section of the linear wood perpendicular to the extending direction thereof is circular and fixed; wherein the diameter of the opening is a target diameter D of the linear wood, the target diameter D is smaller than the diameter of the linear wood before repeatedly passing through the opening; and the difference between the density of the linear wood after repeatedly passing through the opening and the density of the wood raw material from which lignin and hemicellulose are not removed is greater than 0.1 g / cm 3 and less than 2 g / cm 3 .

[0011] Further, the method for preparing the wood raw material from which lignin and hemicellulose are removed into linear wood comprises: twisting a first end of the wood raw material in a first rotation direction and simultaneously twisting a second end of the wood raw material in a second rotation direction until the wood raw material is twisted into linear wood; or, fixing the first end of the wood raw material and twisting the second end of the wood raw material in the first rotation direction until the wood raw material is twisted into linear wood; the linear wood is in a cylindrical shape, and the shape of each cross section of the linear wood perpendicular to the extending direction thereof is circular; wherein the first end and the second end of the wood raw material are arranged in sequence along the length direction of the wood raw material, and the rotation directions of the first rotation direction and the second rotation direction are opposite.

[0012] Further, the method for making the lignin and hemicellulose removed wood material into the linear wood material comprises: cutting the wood material to obtain the sheet wood material; twisting the first end of the sheet wood material in a first rotation direction and simultaneously twisting the second end of the sheet wood material in a second rotation direction until the sheet wood material is twisted into the linear wood material; or, fixing the first end of the sheet wood material and twisting the second end of the sheet wood material in the first rotation direction until the sheet wood material is twisted into the linear wood material; the linear wood material is in a cylindrical shape, and each cross section of the linear wood material perpendicular to the extension direction of the linear wood material is circular; wherein, the first end and the second end of the sheet wood material are arranged in sequence along the length direction of the sheet wood material, and the rotation directions of the first rotation direction and the second rotation direction are opposite; the method for making the lignin and hemicellulose removed wood material into the linear wood material further comprises: removing the lignin and the hemicellulose; wherein, the step of removing the lignin and the hemicellulose is arranged before or after the step of cutting the wood material to obtain the sheet wood material.

[0013] Further, the thickness of the sheet wood material is less than 50 mm; and / or, the width of the sheet wood material is less than 100 mm.

[0014] Further, the thickness of the sheet wood material is greater than or equal to 0.05 mm and less than or equal to 5 mm; and / or, the width of the sheet wood material is greater than or equal to 1 mm and less than or equal to 10 mm.

[0015] Further, the method for removing the lignin and the hemicellulose comprises: removing the lignin and the hemicellulose in the wood material by using a chemical method; and filling water into the wood material after the lignin and the hemicellulose are removed, so as to recombine the microstructure in the wood material and soften the wood material.

[0016] Further, the method for removing the lignin and the hemicellulose in the wood material by using a chemical method comprises: immersing the wood material in a strong alkali solution and heating the strong alkali solution, so as to maintain the strong alkali solution in a boiling state for a first preset time length, so as to remove the lignin and the hemicellulose; taking out the wood material in the strong alkali solution and washing the residual alkaline substances, the lignin and the hemicellulose on the wood material; and drying the wood material after the residual alkaline substances, the lignin and the hemicellulose are removed.

[0017] Further, the method for filling water into the wood material after the lignin and the hemicellulose are removed comprises: immersing the wood material after the lignin and the hemicellulose are removed by using a chemical method in pure water for a second preset time length.

[0018] Further, the method for making the linear wood material further comprises: drying the linear wood material after repeatedly passing through the opening.

[0019] According to another aspect of the present application, there is provided a preparation mold for a linear wood, which is suitable for the above-mentioned method for preparing a linear wood, and the preparation mold for a linear wood comprises a mold main body having an opening for passing the linear wood.

[0020] Further, the mold main body is provided with a tapered hole which penetrates the mold main body, and a small-diameter end of the tapered hole forms the opening.

[0021] The method for preparing a linear wood according to the present application first prepares a wood raw material from which lignin and hemicellulose are removed into a linear wood, which is easier to pass through the mold 10; then, the linear wood is repeatedly passed through the opening 11 of the mold 10 until the shape of each cross section of the linear wood perpendicular to the extending direction thereof is fixed, the linear wood is extruded when passing through the opening 11, the linear wood automatically adjusts the area position along the extending direction thereof, the density of the linear wood is uniformly distributed along the extending direction thereof, and the density of the linear wood is increased, and at the same time, a small amount of water existing in the linear wood is rapidly extruded, and the material is shaped. The method for preparing a linear wood rapidly increases the density of the linear wood by repeatedly passing the linear wood through the opening 11 of the mold 10, densifies the wood, and obtains high performance, and thus the wood is suitable for being used as a reinforcing material of continuous fiber type or wire type. The linear wood obtained by the method for preparing a linear wood according to the present application is a highly flexible linear material, and has very good mechanical tensile properties, and thus solves the problem that the wood is not suitable for being used as a reinforcing material in the prior art, and opens a new direction for processing of wood and processing of composite materials thereof. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application and are incorporated herein for a purpose of explanations and are not intended as an improper limitation to the present application. In the drawings:

[0023] Figure 1 A flow chart of one embodiment of the method for preparing a linear wood according to the present application is shown;

[0024] Figure 2 A schematic diagram of one embodiment of the preparation mold for a linear wood according to the present application is shown;

[0025] Figure 3 A schematic diagram of the linear wood obtained by twisting treatment according to the present application is shown;

[0026] Figure 4 A schematic diagram of the linear wood passing through the mold according to the present application is shown.

[0027] In the above drawings, the following reference signs are used:

[0028] 10: mold; 11: opening; 12: mold main body; 13: tapered hole; 20: linear wood. DETAILED DESCRIPTION

[0029] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0030] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs.

[0031] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of a feature, step, operation, device, component, and / or combination thereof.

[0032] The present application provides a method for preparing linear wood, please refer to Figure 1 , comprising: preparing a wood raw material from which lignin and hemicellulose are removed into linear wood; repeatedly passing the linear wood through the opening 11 of the mold 10 so that the linear wood is extruded when passing through the opening 11 until the shape of each cross section of the linear wood perpendicular to its extension direction is fixed.

[0033] The method for preparing linear wood of the present application first prepares a wood raw material from which lignin and hemicellulose are removed into linear wood, which is easier to pass through the mold 10; then, repeatedly passing the linear wood through the opening 11 of the mold 10 until the shape of each cross section of the linear wood perpendicular to its extension direction is fixed, the linear wood is extruded when passing through the opening 11, the linear wood will automatically adjust the area position along its extension direction, the density of the linear wood is uniformly distributed in its extension direction, and the density of the linear wood is increased, at the same time, a small amount of water existing in the linear wood is quickly extruded, and the material is shaped. The method for preparing linear wood passes the linear wood repeatedly through the opening 11 of the mold 10, the density of the linear wood is rapidly increased, the wood is densified, high performance is obtained, and thus the wood is suitable for being used as a reinforcing material of continuous fiber class\wire class.

[0034] It should be noted that the linear wood can be used as a reinforcing material of continuous fiber class\wire class, and can also be applied in other fields.

[0035] It should be noted that the linear wood is a wood structure in a linear shape, that is, a wood structure in a strip shape; in the step of preparing the wood material from which the lignin and hemicellulose are removed into the linear wood, the shape of each cross section of the linear wood perpendicular to the extension direction thereof can be a regular shape or an irregular shape, and is not limited.

[0036] In the embodiment, the method of repeatedly passing the linear wood through the opening 11 of the mold 10 to extrude the linear wood when passing through the opening 11 until the shape of each cross section of the linear wood perpendicular to the extension direction thereof is fixed includes: repeatedly passing the linear wood through the opening 11 in a circular shape until the shape of each cross section of the linear wood perpendicular to the extension direction thereof is circular and fixed; wherein the diameter of the opening 11 is the target diameter D of the linear wood, the target diameter D is smaller than the diameter of the linear wood before repeatedly passing through the opening 11; the difference between the density of the linear wood after repeatedly passing through the opening 11 and the density of the wood material from which the lignin and hemicellulose are not removed is greater than 0.1 g / cm 3 and less than 2 g / cm 3 . When the linear wood passes through the opening 11, the linear wood will automatically adjust the position along the direction of the center line, the distribution of the linear wood in each part is relatively balanced, and at the same time, a small amount of moisture in the linear wood is quickly extruded, and due to the rapid increase in the density of the linear wood in the same period, the wood is densified to obtain high performance.

[0037] Wherein the diameter of the prepared linear wood can be adjusted according to the diameter of the opening of the mold, and the difference between the actual diameter of each cross section of the linear wood after repeatedly passing through the opening 11 and the target diameter D maintains a certain inverse ratio with the size of the opening. In specific implementation, since the linear wood repeatedly passes through the circular opening 11, the shape of each cross section of the linear wood is basically the same, and the actual diameter of each cross section and the target diameter D maintains a certain difference.

[0038] In the embodiment, the method of preparing the linear wood further includes: drying the linear wood after repeatedly passing through the opening 11.

[0039] Specifically, the method of drying the linear wood after repeatedly passing through the opening 11 includes: placing the linear wood after repeatedly passing through the opening 11 into an oven for a fourth preset time until drying; wherein the fourth preset time is greater than or equal to 20 min, and the oven temperature is set to be greater than or equal to 30℃ and less than or equal to 100℃. In addition, the drying of the linear wood can also be completed by natural drying.

[0040] In the embodiment, the method for making the wood material with lignin and hemicellulose removed into the linear wood material includes: twisting a first end of the wood material in a first rotation direction, and simultaneously twisting a second end of the wood material in a second rotation direction, until the wood material is twisted into the linear wood material 20; or, fixing the first end of the wood material, and twisting the second end of the wood material in the first rotation direction, until the wood material is twisted into the linear wood material; as shown in the figure, the linear wood material 20 is in a cylindrical shape, and each cross section of the linear wood material 30 perpendicular to the extension direction thereof is circular; wherein the first end and the second end of the wood material are arranged in sequence along the length direction of the wood material, and the rotation directions of the first rotation direction and the second rotation direction are opposite. This step is the reason why the wood material can finally be formed into a linear shape and dried to be soft and woven into cloth. Figure 3

[0041] Specifically, the method for making the wood material with lignin and hemicellulose removed into the linear wood material includes: cutting the wood material to obtain a sheet-shaped wood material; twisting a first end of the sheet-shaped wood material in a first rotation direction, and simultaneously twisting a second end of the sheet-shaped wood material in a second rotation direction, until the sheet-shaped wood material is twisted into the linear wood material; or, fixing the first end of the sheet-shaped wood material, and twisting the second end of the sheet-shaped wood material in the first rotation direction, until the sheet-shaped wood material is twisted into the linear wood material; the linear wood material is in a cylindrical shape, and each cross section of the linear wood material perpendicular to the extension direction thereof is circular; wherein the first end and the second end of the sheet-shaped wood material are arranged in sequence along the length direction of the sheet-shaped wood material, and the rotation directions of the first rotation direction and the second rotation direction are opposite; the method for making the wood material with lignin and hemicellulose removed into the linear wood material further includes: removing lignin and hemicellulose; wherein the step of removing lignin and hemicellulose is arranged before or after the step of cutting the wood material to obtain the sheet-shaped wood material. It should be noted that the length direction of the sheet-shaped wood material is the extension direction of the linear wood material.

[0042] In specific implementation, the sheet-shaped wood material is made into the cylindrical linear wood material by using this method, which is beneficial to the wood material passing through the opening 11 to be extruded to achieve the effect of fixed shape. It should be noted that the sheet-shaped wood material is changed into the linear wood material with a three-dimensional shape by other ways, which can be included in the step of making the wood material with lignin and hemicellulose removed into the linear wood material. In the embodiment, the thickness of the sheet-shaped wood material is less than 50 mm; and / or, the width of the sheet-shaped wood material is less than 100 mm. Wherein, the sheet-shaped wood material is in a rectangular shape.

[0043] In specific implementation, the thickness and the width of the sheet-shaped wood material can determine the final size of the linear wood material. By setting the thickness of the sheet-shaped wood material to be less than 50 mm and the width to be less than 100 mm, the use of the mold 10 can be avoided, and the instability of the mechanical performance strength of the final linear wood material can be avoided.

[0044] ​Optionally, the thickness of the sheet-shaped wood is greater than or equal to 0.05 mm and less than or equal to 5 mm; and / or, the width of the sheet-shaped wood is greater than or equal to 1 mm and less than or equal to 10 mm. Such further limitation on the thickness and width of the sheet-shaped wood will improve the mechanical strength of the linear-shaped wood produced finally.

[0045] Optionally, the thickness of the sheet-shaped wood is greater than or equal to 0.2 mm and less than or equal to 0.4 mm; and / or, the width of the sheet-shaped wood is greater than or equal to 6 mm and less than or equal to 10 mm. Such further limitation on the thickness and width of the sheet-shaped wood will improve the mechanical strength of the linear-shaped wood produced finally.

[0046] Optionally, the thickness of the sheet-shaped wood is equal to 0.2 mm, or 0.3 mm, or 0.4 mm; and the width of the sheet-shaped wood is equal to 8 mm, or 6 mm, or 10 mm. Wherein, the length of the sheet-shaped wood is not limited.

[0047] Preferably, the thickness of the sheet-shaped wood is equal to 0.2 mm, and the width of the sheet-shaped wood is equal to 8 mm.

[0048] In the embodiment, the method for removing lignin and hemicellulose includes: removing lignin and hemicellulose in the wood raw material by using a chemical method; and filling water into the wood raw material after removing lignin and hemicellulose, so as to recombine the microstructure in the wood raw material and soften the wood raw material. After removing lignin and hemicellulose and filling water by using the method, the wood can be used as a material for preparing linear-shaped wood; wherein, the recombination of the microstructure is a prerequisite for repeatedly passing the linear-shaped wood through the opening 11 of the mold 10 to densify the wood, and the softening of the wood is a prerequisite for twisting the wood raw material to form the linear-shaped wood.

[0049] It should be noted that when the wood raw material is cut into sheet-shaped wood first and then the sheet-shaped wood is removed of lignin and hemicellulose, the sheet-shaped wood is also removed of lignin and hemicellulose by using the above method.

[0050] In the embodiment, the method for removing lignin and hemicellulose in the wood raw material by using a chemical method includes: immersing the wood raw material into a strong alkali solution and heating the strong alkali solution, so as to maintain the strong alkali solution in a boiling state for a first preset time length, so as to remove lignin and hemicellulose; taking out the wood raw material in the strong alkali solution and washing the wood raw material to remove residual alkaline substances, lignin and hemicellulose; and drying the wood raw material after removing the residual alkaline substances, lignin and hemicellulose. In specific implementation, lignin and hemicellulose in the wood raw material or the sheet-shaped wood are removed by using a chemical method, so as to improve the mechanical properties of the wood.

[0051] Specifically, the strong alkali solution is an alkaline solution with a PH value greater than 10.

[0052] Optionally, the strong alkali solution is a solution with a ratio of 0.2M-5M sodium hydroxide and 0.05M-1M sodium sulfite in water; wherein M is the volume molar concentration. It should be noted that the solution ratio can be adjusted, and the basic component can also be used with other chemicals.

[0053] Specifically, the first preset time length is greater than 2h. Optionally, the first preset time length is 48h.

[0054] In specific implementation, after the wood raw material in the strong alkali solution is taken out, and the residual basic substances, lignin and hemicellulose on the wood raw material are washed, the wood raw material can be immersed in water for more than 1min, preferably 1h; after the residual basic substances, lignin and hemicellulose on the wood raw material are removed, the wood raw material is placed in an oven for drying, and the temperature in the oven can be set to 40-80℃ until the wood raw material is completely dried.

[0055] In other embodiments, after the residual basic substances, lignin and hemicellulose on the wood raw material are removed, the wood raw material can be dried at room temperature for more than 24h.

[0056] In other embodiments, the method for washing the residual basic substances, lignin and hemicellulose on the wood raw material can also be ultrasonic cleaning, and the number of times of washing can be adjusted.

[0057] In this embodiment, the method for filling water into the wood raw material from which lignin and hemicellulose are removed includes: immersing the wood raw material from which lignin and hemicellulose are removed by a chemical method in pure water for a second preset time length.

[0058] Specifically, the second preset time length is greater than 1min. Preferably, the second preset time length is 5min.

[0059] The application also provides a preparation mold for linear wood, please refer to Figure 2 and Figure 4 The preparation mold for linear wood is suitable for the preparation method of linear wood in the above embodiments, and the preparation mold for linear wood includes a mold body 12, and the mold body 12 has an opening 11 for passing the linear wood. In specific implementation, the linear wood is extruded when passing through the opening 11, so that the mechanical properties of the linear wood are improved.

[0060] In this embodiment, the mold body 12 is provided with a tapered hole 13, the tapered hole 13 penetrates through the mold body 12, and the small-diameter end of the tapered hole 13 forms the opening 11.

[0061] In specific implementation, the taper hole 13 is arranged to make the linear wood gradually deform from entering the taper hole 13 to the opening 11, and finally the same shape as the opening 11, avoiding the linear wood directly passing through the opening 11 and causing severe deformation to damage the linear wood.

[0062] In specific implementation, the linear wood prepared by the preparation method of the linear wood has the tensile strength and Young's modulus of the linear wood as shown in the following table:

[0063]

[0064] Therefore, the tensile properties of the linear wood treated by the preparation method of the linear wood are greatly improved. The tensile strength of the linden wood is 40-80 MPa, and the Young's modulus is 1-2.5 GPa. After treatment, the tensile strength is greater than 280 MPa, and the Young's modulus is greater than 20 GPa. Different woods treated by the preparation method have a tensile strength greater than or equal to 280 MPa and less than or equal to 700 MPa, and a Young's modulus greater than or equal to 20 GPa and less than or equal to 50 GPa.

[0065] The application has the following innovations:

[0066] The preparation method of the application can be used to prepare wood wire with greatly improved mechanical properties and good processing performance under drying: preparation of raw material size, chemical removal of lignin and hemicellulose, water filling, wire preparation, and drying modification through the die 10; using the die 10 with a controlled caliber to improve the diameter size stability of the linear wood and enhance the density of the wood; the wood treated by this preparation method has a large deformation freedom and high mechanical properties, and can withstand high-frequency bending, greatly expanding the processing and application range.

[0067] In specific implementation, the wood material with lignin and hemicellulose removed is twisted into flexible linear wood; the linear wood is repeatedly passed through the opening of the mold so that the density of the linear wood is significantly improved, and the shape of each cross section of the linear wood perpendicular to the extension direction of the linear wood is kept fixed. The linear wood manufactured by the application has the following advantages: the linear wood manufactured by the application has very high deformation freedom in daily environment without operation in extreme environment and can be processed for two or more times; the linear wood manufactured by the application has very high deformation freedom under operation in dry extreme environment, and the material itself has very good mechanical properties; the linear wood manufactured by the application is 100% pure wood without addition of any other material component, and can reach a very high material performance level through the processing mode provided by the application; the linear wood manufactured by the application is 100% pure wood without any other material, which is completely environmentally friendly and safe.

[0068] From the above description, it can be seen that the above-mentioned embodiments of the application achieve the following technical effects:

[0069] The preparation method of the linear wood of the application first prepares the wood material with lignin and hemicellulose removed into linear wood, which is easier to pass through the mold 10; then, the linear wood is repeatedly passed through the opening 11 of the mold 10 until the shape of each cross section of the linear wood perpendicular to the extension direction of the linear wood is kept fixed. When the linear wood passes through the opening 11, the linear wood is extruded and automatically adjusts the area position along the extension direction of the linear wood, the density of the linear wood is uniformly distributed in the extension direction of the linear wood, and the density of the linear wood is increased. At the same time, a small amount of water in the linear wood is quickly extruded, and the material is shaped. The preparation method of the linear wood passes the linear wood through the opening 11 of the mold 10 repeatedly, rapidly increases the density of the linear wood, densifies the wood, obtains high performance, and further makes the wood suitable for being used as a reinforcing material of continuous fiber type \ wire type.

[0070] It should be noted that the terms "first", "second", and the like in the specification and claims of the application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0071] For purposes of the description hereinafter, spatial or directional terms, for example, "above", "below", "upper", "lower", and the like, can be used, and relate to the device as illustrated in the figures. However, it is to be understood that no device or feature described herein is limited to the position shown in the figures and can be oriented in other directions, for example, rotated 90 degrees or at other orientations, and that the spatial and directional terms used herein are in reference to the positions of the devices or features shown in the figures and are made only for purposes of illustration. There is no intention in the use of such spatial or directional terms to limit the subject technology.

[0072] The foregoing is merely illustrative of the principles of this application and various modifications can be made by those skilled in the art without departing from the scope and spirit of the application. Any such modifications are intended to be included within the scope of the application.

Claims

1. A method for preparing linear wood, characterized in that, include: Wood raw materials from which lignin and hemicellulose are removed are made into linear wood; The linear timber is repeatedly passed through the opening (11) of the mold (10) so that the linear timber is compressed as it passes through the opening (11) until the shape of each section of the linear timber perpendicular to its extension direction remains fixed. Methods for producing linear wood from wood raw materials by removing lignin and hemicellulose include: The wood raw material is cut to obtain sheet wood; the first end of the sheet wood is twisted along a first rotation direction, and the second end of the sheet wood is twisted along a second rotation direction, until the sheet wood is twisted into the thread wood; or, the first end of the sheet wood is fixed, and the second end of the sheet wood is twisted along the first rotation direction, until the sheet wood is twisted into the thread wood; wherein the first end and the second end of the sheet wood are arranged sequentially along the length direction of the sheet wood. or, The first end of the wood material is twisted along a first rotation direction, and the second end of the wood material is twisted along a second rotation direction until the wood material is twisted into the linear wood; or, the first end of the wood material is fixed, and the second end of the wood material is twisted along the first rotation direction until the wood material is twisted into the linear wood; wherein the first end and the second end of the wood material are arranged sequentially along the length direction of the wood material. The linear timber is cylindrical, and each cross-section of the linear timber perpendicular to its extension direction is circular. The first rotation direction and the second rotation direction are opposite in direction.

2. The method for preparing linear wood according to claim 1, characterized in that, The method of repeatedly passing the linear timber through the opening (11) of the mold (10) to compress the linear timber as it passes through the opening (11) until the shape of each cross-section of the linear timber perpendicular to its extension direction remains fixed includes: The linear timber is repeatedly passed through the circular opening (11) until the shape of each cross section of the linear timber perpendicular to its extension direction is circular and remains fixed. Wherein, the diameter of the opening (11) is the target diameter D of the linear wood, and the target diameter D is smaller than the diameter of the linear wood before it repeatedly passes through the opening (11); the difference between the density of the linear wood after repeatedly passing through the opening (11) and the density of the wood raw material without removing the lignin and hemicellulose is greater than 0.1 g / cm³. 3 And less than 2g / cm 3 .

3. The method for preparing linear wood according to claim 1, characterized in that, A method for producing filamentous wood from wood raw materials with lignin and hemicellulose removed further includes: removing the lignin and hemicellulose; wherein the step of removing the lignin and hemicellulose is performed before or after the step of cutting the wood raw materials to obtain sheet wood.

4. The method for preparing linear wood according to claim 3, characterized in that, The thickness of the sheet wood is less than 50 mm; and / or, The width of the sheet wood is less than 100 mm.

5. The method for preparing linear wood according to claim 3, characterized in that, The thickness of the sheet wood is greater than or equal to 0.05 mm and less than or equal to 5 mm; and / or, The width of the sheet wood is greater than or equal to 1 mm and less than or equal to 10 mm.

6. The method for preparing linear wood according to any one of claims 1 to 5, characterized in that, The method for removing the lignin and the hemicellulose includes: The lignin and hemicellulose in the wood raw material are removed by chemical methods; The wood material after the lignin and hemicellulose have been removed is filled with water to reorganize the microstructure in the wood material and soften the wood material.

7. The method for preparing linear wood according to claim 6, characterized in that, Methods for removing lignin and hemicellulose from the wood raw material using chemical methods include: The wood raw material is immersed in a strong alkaline solution and the strong alkaline solution is heated to keep the strong alkaline solution in a boiling state for a first preset time to remove the lignin and the hemicellulose. Remove the wood material from the strong alkaline solution and wash away any residual alkaline substances, lignin, and hemicellulose from the wood material; The wood raw material, after removing residual alkaline substances, lignin, and hemicellulose, is dried.

8. The method for preparing linear wood according to claim 6, characterized in that, A method for filling the wood raw material after removing the lignin and hemicellulose with water includes: The wood raw material, from which lignin and hemicellulose have been removed by chemical methods, is immersed in pure water for a second preset time.

9. The method for preparing linear wood according to any one of claims 1 to 5, characterized in that, The method for preparing the linear timber further includes drying the linear timber after it has been repeatedly passed through the opening (11).

10. A mold for preparing linear wood, characterized in that, The method for preparing linear timber according to any one of claims 1 to 9, wherein the die for preparing linear timber comprises a die body (12) having an opening (11) for allowing the linear timber to pass through.

11. The mold for preparing linear wood according to claim 10, characterized in that, The mold body (12) is provided with a tapered hole (13), which penetrates the mold body (12), and the small diameter end of the tapered hole (13) forms the opening (11).

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