A vertical wood board and a method for manufacturing the same

Abstract

This application discloses a vertical timber board and its preparation method, including a main unit and a filling unit. The main unit comprises multiple arrayed timber segments and / or partial timber segments, the longitudinal direction of which is at an angle to the surface of the vertical timber board. The filling unit is formed by compacting a mixture of filler material and adhesive into the gaps between adjacent timber segments and bonding the timber segments and / or partial timber segments together. By using the filling unit, the gaps between timber segments, between partial timber segments, and between timber segments and partial timber segments are filled, thus ensuring that the required bonding strength is achieved with only an acceptable amount of adhesive regardless of the cross-sectional shape of the timber segments.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of artificial board, in particular to a vertical wood board with wood segments as main units; the present application also relates to a preparation method of the vertical wood board. BACKGROUND

[0002] The vertical wood board is a kind of composite board made by splicing wood segments with cross-sectional shapes of rectangle, square, regular pentagon, regular hexagon, regular octagon, etc., usually obtained by processing rotary cut wood core or small-diameter lumber into rod-shaped wood, and then splicing and bonding, with the transverse section of wood as the normal surface (wear-resistant surface). Since the transverse section in the vertical fiber direction constitutes the use surface of the vertical wood board, it has the advantages of good wear resistance, high compressive strength, high elasticity, high heat conduction efficiency, good moisture resistance and sound insulation, and can be used in both indoor and outdoor environments; it can also form various patterns by splicing different shapes of wood segments; and it has relatively strong raw material adaptability by using small-diameter lumber and intermediate-rotation lumber as raw materials.

[0003] For example, the patent CN104210013B discloses a method for manufacturing large-section hexagonal prism integrated material, which comprises the following steps: coating glue on three surfaces of wood segments with hexagonal prism and isosceles trapezoidal shape, assembling the hexagonal prism model, and gluing after three-directional pressing. The obtained integrated material can be further used by being sawed into vertical wood boards. However, vertical wood boards are rarely seen in the market, mainly because the width and length directions of the vertical wood boards are the radial directions of the wood segments, which will cause relatively large size changes due to changes in environmental temperature and humidity, resulting in problems such as delamination between adjacent wood segments. On the other hand, the shape of the wood segments used in the above method is limited to rectangular prism, square prism and hexagonal prism due to process limitations, and if other polyhedral prisms are used, larger gaps will be left between the adjacent wood segments, increasing the amount of glue applied and affecting the bonding strength.

[0004] There are few records of products and production methods of vertical wood boards spliced from cylindrical wood segments in the prior art, because the gap between adjacent wood segments is too large when splicing cylindrical wood segments, which increases the difficulty of applying glue, such as larger amount of glue and weakened bonding strength. The patent application CN113910378A discloses a method for manufacturing a net-format solid wood composite board core material from rotary cut veneer wood core, which comprises the following steps: cutting the rotary cut wood core along the axial direction, reversing the splicing, and then widening the wood core in the transverse direction. The patent application also discloses a method for cutting grooves on the wood core strip and inserting a panel into the grooves. The half-circular shape of the adjacent wood cores has a gap. The above technical solutions still do not solve the problem of splicing gap, and the process is too complicated to have the possibility of industrialization. SUMMARY

[0005] The present application aims to overcome the above technical problems, and provides a vertical wood board and a preparation method thereof.

[0006] To achieve the above-mentioned purpose, one embodiment of the present application provides a vertical wood board, comprising a main unit and a filling unit, the main unit comprises a plurality of arrayed wood segments and / or partial wood segments, the longitudinal direction of the wood segments and / or the partial wood segments is at an angle to the surface of the vertical wood board; the filling unit is a mixture of filling material and adhesive which is compacted and filled in the gap between adjacent wood segments and bonded to connect the wood segments and / or the partial wood segments.

[0007] Preferably, the longitudinal direction of the wood segments and / or the partial wood segments is at an angle of 50-90° to the surface of the vertical wood board.

[0008] Preferably, the longitudinal direction of the wood segments and / or the partial wood segments is perpendicular to the surface of the vertical wood board.

[0009] Preferably, the wood segments are cylinders, prisms, cubes or elliptical cylinders; the partial wood segments are partial cylinders, partial prisms, partial cubes or partial elliptical cylinders.

[0010] Preferably, the filling material is a mixture of one or more of particles, chips or fibers.

[0011] Another embodiment of the present application discloses a method for the above-mentioned vertical wood board, comprising the following steps:

[0012] I. The step of assembling blanks, taking long wood segments and laying them side by side to form a long wood segment layer, and spreading the mixture to fill the gap between the long wood segments to obtain a first intermediate product;

[0013] II. The step of pre-pressing, placing the first intermediate product under a pressure of 0.8-1.3 MPa at room temperature for 0.5-2 min;

[0014] III. The step of pre-heating, heating the first intermediate product after pre-pressing to a temperature of 80-90℃;

[0015] IV. The step of pressing, applying pressure to both sides of the first intermediate product to make the mixture more compact, and bonding the mixture and the long wood segments to form a square material, wherein the temperature of pressing is 120-130℃, the pressure is 2.0-2.5 MPa, and the time is 10-15 min;

[0016] V. The step of sawing, sawing the square material at an angle to the longitudinal direction of the long wood segments to obtain the vertical wood board.

[0017] Six, drying process, the vertical wood board is dried to a moisture content of 12-14%, the internal moisture content deviation is less than 2%.

[0018] As preferred, in the process of assembling blanks, the moisture content of the long wood segments is 6-8%.

[0019] As preferred, in the process of assembling blanks, the thickness of the spread mixture is greater than the thickness of the long wood segment layer.

[0020] As preferred, in the process of assembling blanks, a second layer of long wood segment layer is laid on the first intermediate product, and then the mixture is spread again to fill the gaps between the long wood segments in the second layer of long wood segment layer to obtain a second intermediate product, and the above steps are implemented at least once to obtain a blank square material; and,

[0021] The total thickness of the spread mixture is greater than the thickness of two layers of long wood segment layer.

[0022] The long wood segments in the two layers of long wood segment layer are staggered up and down.

[0023] As preferred, in the process of pre-pressing, the pre-pressing force is applied to both sides of the blank square material; in the process of pressing, the pressing force is applied to both sides and two sides of the blank square material;

[0024] The temperature of the pressing force applied to the two sides of the blank square material is 85-95℃, and the pressure is 1.8-2.2MPa.

[0025] In summary, compared with the prior art, the beneficial effects of the present application are:

[0026] 1. By setting the filling unit, the filling unit fills the gaps between the wood segments, between the partial wood segments, and between the wood segments and the partial wood segments, so that regardless of the shape of the cross section of the wood segment, only an acceptable amount of glue is required to meet the use requirements of the bonding strength.

[0027] 2. By setting the filling unit as a mixture of filling material and adhesive and compacting, the changes of wood swelling and shrinkage can be digested and adapted to a certain extent, and the problem of glue failure caused by relatively large size changes of wood segments (partial wood segments) can be avoided.

[0028] 3. By setting the initial moisture content of the wood pieces and the partial wood pieces to a lower level, the amount of compression of the mixture in the voids is less than the mixture above or between the layers of long wood pieces in the thickness direction, and by having the wood pieces and the partial wood pieces have a lower initial moisture content, it is practically possible to keep them in a swelling trend all the time, and it is obvious that the filling unit has enough space to be compressed again to accommodate and digest the swelling amount of the wood pieces and the partial wood pieces.

[0029] 4. By making the hot-pressing process of the two webs and the two sides different in the flake pressing, the pressed board is artificially made to have a difference in the width and length directions by using the compression resilience characteristics of the wood pieces, and the defect of the prior art that the three directions of the pressed board change equally is overcome. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor under the premise of these drawings.

[0031] Figure 1 The structure schematic diagram of the vertical wood board of the embodiment 1 of the present application.

[0032] Figure 2 The structure schematic diagram of the flake board and the wood piece of the embodiment 1 of the present application.

[0033] Figure 3 The structure schematic diagram of the vertical wood board of the embodiment 2 of the present application.

[0034] Figure 4 The structure schematic diagram of the vertical wood board of the embodiment 3 of the present application.

[0035] Figure 5 The flow chart of the preparation process of the vertical wood board of the embodiment 4 of the present application.

[0036] Figure 6 The structure schematic diagram of the vertical wood board of the embodiment 5 of the present application.

[0037] Figure 7 The flow chart of the preparation process of the vertical wood board of the embodiment 5 of the present application.

[0038] Figure 8 The structure schematic diagram of the vertical wood board of the embodiment 7 of the present application.

[0039] Figure 9 The sawing mode schematic diagram of the sawing process of the embodiment 7 of the present application.

[0040] In the figure: 100, vertical wood board, 200, shaving board, 101, wood segment, 102, partial wood segment, 103, filling unit, 104, assembly hole, 105, first veneer, 106, second veneer. DETAILED DESCRIPTION

[0041] In order to make the person skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application. Embodiment 1

[0042] Referring to Figure 1 A vertical wood board 100 shown in the figure includes a main unit and a filling unit 103. The main unit includes a plurality of wood segments 101 and partial wood segments 102 arranged in an array, and the longitudinal direction L0 of the wood segments 101 and the partial wood segments 102 is parallel to each other and forms an angle with the surface of the vertical wood board 100. The longitudinal direction of the wood segment 101 or the partial wood segment 102 refers to the longitudinal direction in the three directions of wood, that is, the height direction formed in the growth of the tree. The filling unit 103 is a composite pressing material formed by compactly pressing a mixture of filling material and adhesive, which fills the gap between adjacent wood segments 101 and partial wood segments 102 and bonds the wood segments 101, the partial wood segments 102, and the wood segments 101 and the partial wood segments 102.

[0043] Through the above structure, by the arrangement of the filling unit 103, and the filling unit 103 being a mixture of filling material and adhesive, no matter what shape the cross section of the wood segment 101 is, only an acceptable amount of adhesive needs to be used to meet the bonding strength requirement. The reason is that the filling unit 103 fills the gap between the wood segments 101, the partial wood segments 102, and the wood segments 101 and the partial wood segments 102. At the same time, the filling unit 103 formed by compactly pressing the mixture can be regarded as a whole, and the filling unit 103 actually bonds the wood segments 101 and / or the partial wood segments 102. Thus, the amount of adhesive used to bond the wood segments 101 and / or the partial wood segments 102 can be greatly reduced, and the bonding strength is ensured.

[0044] Further, the filling material in the filling unit 103 has certain elasticity after being compacted and bonded by the adhesive film, so as to be able to digest the change of the wood piece 101 caused by wet expansion and dry shrinkage to a certain extent. When the wood piece 101 expands in a humid environment, the filling unit 103 can be further extruded to adapt to the expansion of the wood piece 101; when the wood piece 101 shrinks in a dry environment, the filling unit 103 can expand to a certain size to adapt to the shrinkage of the wood piece 101. Of course, the size expansion of the filling unit 103 in the dry environment is the compression rebound after the pressure disappears or decreases, rather than the size change caused by wet expansion and dry shrinkage.

[0045] Specifically, the wood piece 101 in the embodiment is a short wood piece of a five-prism body, and the partial wood piece 102 is a short wood piece of a five-prism body of the same shape and size as the wood piece 101, which is formed by cutting parallel to the fiber direction, so as to cut a part of the complete wood piece to make the size of the wood plank 100 meet the design requirements. Of course, the wood piece 101 can also be other prism bodies, such as a cube, a six-prism body or an eight-prism body, and the partial wood piece 102 is a partial cube, a partial six-prism body or a partial eight-prism body. At the same time, those skilled in the art should know that the cutting is to obtain the wood plank 100 of a size that meets the production needs, so the wood plank 100 obtained can also be all wood pieces 101 or all partial wood pieces 102.

[0046] The longitudinal direction of the wood piece 101 and the partial wood piece 102 is perpendicular to the surface of the wood plank 100, in other words, the longitudinal direction of the wood piece 101 and the partial wood piece 102 constitutes the thickness of the wood plank 100. The plurality of wood pieces 101 are vertically placed and arranged in a rectangular array. In the embodiment, even a gap is intentionally reserved between adjacent wood pieces 101, and the filling unit 103 bonds the adjacent wood pieces 101 and fills the gap between the adjacent wood pieces 101 to obtain the rough material of the wood plank 100. The wood plank 100 of a size that meets the requirements is obtained by cutting. During the cutting process, a part of the wood pieces 101 become the partial wood pieces 102. The intentionally reserved gap can provide space for the expansion and morphological change of the wood piece 101. The filling unit 103 filled in the gap forms a flat surface of the wood plank 100 and provides elastic restriction for the change of the wood piece 101.

[0047] The filler material in filler unit 103 is one or a mixture of granules, chips, or fibers. The selection of the filler material is mainly based on the type of wood segment 101. When the wood segment 101 is rod-shaped wood processed from small-diameter timber, a material with relatively high elasticity or compression recovery should be selected, such as wood shavings. When the wood segment 101 is rotary-cut wood core material, a material with relatively low elasticity or compression recovery can be selected, such as wood-plastic composite particles. Alternatively, two or three filler materials can be selected and mixed according to the characteristics of the tree species. In this embodiment, the selected filler material is wood chips, specifically C-type wood shavings, with a size of (0.8~1.2)cm × (5~7)cm × (0.01~0.03) (width × length × thickness).

[0048] The vertical timber board 100 of this application is prepared by the following process.

[0049] First, select a specific particleboard 200. The specific particleboard 200 refers to a particleboard that uses C-type wood shavings and whose shavings are (0.8~1.2)cm×(5~7)cm×(0.01~0.03)cm (width×length×thickness). The particleboard 200 has dimensions of 122cm×244cm×2cm (width×length×thickness).

[0050] Subsequently, referring to Figure 2 As shown, long wood segments are produced. Rotary-cut wood core material is processed into long, pentahedral wood segments using a rod-shaped processing device. The cross-sectional shape of each long wood segment is a regular pentagon inscribed in a circle with a radius of 5 cm. These long wood segments are then sawn into wood segments 101 with a length equal to the thickness of the particleboard. In this embodiment, the length of wood segment 101 is 2 cm. Simultaneously, the substrate for the vertical wood board is produced. Multiple arrays of assembly holes 104 are made along the width and length of the particleboard 200 using methods such as punching, wire cutting, and drilling. The assembly holes 104 are through holes, and their cross-sectional shape is the same as that of the wood segments 101, allowing the wood segments 101 to be inserted into them and forming a gap fit of approximately 0.05–0.08 mm.

[0051] Afterwards, the wood segments 101 are inserted into the assembly holes 104 after being coated with adhesive on five of their six faces. The adhesive used is a mixture of white glue and hot melt adhesive powder, with a mass ratio of 1:1. The purpose of using the mixed adhesive is to glue the wood segments 101 and the assembly holes 104 while filling the gap between them. At the same time, during the heat curing process, the hot melt adhesive powder in the mixed adhesive melts and flows to uniformly fill the gap, and after cooling, a certain toughness of the adhesive layer is formed, so that the mixed adhesive forms an adhesive layer that can buffer the effects of the wet expansion and dry shrinkage of the wood segments 101 on the base plate of the shiplap 100, making the structure of the shiplap 100 more stable. Therefore, the remaining part of the particle board 200 after the hole is opened, and the adhesive layer of the mixed adhesive together form the filling unit 103 of the present embodiment.

[0052] Afterwards, the particle board with the wood segments 101 inserted is placed in a hot press to heat cure the mixed adhesive at a hot pressing temperature of 155-165°C to obtain the rough material of the shiplap.

[0053] Finally, the rough material of the shiplap is sawn into shiplap 100 of the required size and specification. Example 2

[0054] The difference between Example 2 and Example 1 is that, as shown in Figure 3 the base plate of the shiplap with the assembly holes 104 is placed on the first veneer 105 coated with adhesive on one side, then the wood segments 101 coated with mixed adhesive are inserted into the assembly holes 104, and finally the adhesive is heat cured to glue the wood segments 101 and the inner wall of the assembly holes 104, the base plate of the shiplap and the first veneer 105, and the bottom surface of the wood segments 101 and the first veneer 105. The first veneer 105 is a 2-5mm thick veneer of a man-made board or a rotary cut or sliced veneer, and the adhesive coated on its surface is a phenol formaldehyde resin adhesive or other existing hot melt adhesive. Example 3

[0055] The difference between Example 3 and Example 2 is that, as shown in Figure 4As shown, first, the base plate of the vertical wood board material with the assembly hole 104 is placed on the first single board 105 coated with adhesive on the surface, then the wood section 101 coated with mixed adhesive is inserted into the assembly hole 104, and then the second single board 106 coated with adhesive is covered on the blank of the vertical wood board material, and finally the adhesive is cured by hot pressing to glue the wood section 101 and the inner wall of the assembly hole 104, the base plate of the vertical wood board material and the first single board 105 and the second single board 106, and the bottom surface of the wood section 101 and the first single board 105 and the second single board 106. The second single board 106 is a single board of a man-made board with a thickness of 2-5 mm or a rotary cut or sliced single board, and the adhesive coated on the surface thereof is a phenolic resin adhesive or other hot melt adhesive of the prior art. Example 4

[0056] Example 4 is different from Example 1 in that, with reference to Figure 5 As shown, the vertical wood board material 100 is prepared by the following process steps.

[0057] Step one, the process of assembling blanks: taking the long wood sections 110 of regular pentagonal shape, laying them side by side on the continuous conveyor with baffles to form a layer of long wood sections, and spreading the mixture to fill the gaps between the long wood sections 110 to obtain a first intermediate product. The cross-sectional shape of the long wood section 110 is a regular pentagon inscribed in a circle with a radius of 5 cm, and the length of the long wood section 110 is 2 m. The shape of the long wood section 110 falling on the conveyor is not limited, only the length direction needs to be parallel to the conveying direction, but under the action of gravity, one of its planes will be in contact with the conveyor. The mixture is a mixture of shavings and mixed adhesive, i.e. shavings after mixing with adhesive. In order to enable the mixture to be compressed, the thickness of the mixture after spreading should be greater than the thickness of the layer of long wood sections. In this embodiment, the natural thickness of the mixture after spreading is 1.5 times the thickness of the layer of long wood sections.

[0058] Step two, the process of pre-pressing: the first intermediate product is pre-pressed by multiple groups of pressure rollers, the temperature of the pressure rollers is room temperature, the pressure is 0.9-1.0 MPa, and the multiple groups of pressure rollers can provide a continuous pressure of 0.5 min to the first intermediate product. The process of pre-pressing can promote the uniform distribution of the mixture in the gaps between adjacent long wood sections 110.

[0059] Step three, the process of pre-heating: the first intermediate product after pre-pressing is passed through a microwave heat tunnel, the internal temperature of the microwave heat tunnel is 84±2℃, and the temperature of the first intermediate product after leaving the microwave heat tunnel reaches 82±2℃.

[0060] Step 4, Pressing Process: Under conditions of confinement on both sides, pressure is applied to both sides of the first intermediate product to obtain square material 120. This pressure is provided by multiple sets of hot rollers at a temperature of 125±2℃ and a pressure of 2.2~2.3MPa. The multiple sets of hot rollers can provide continuous pressure to the first intermediate product for 10 minutes. Under this pressure, the mixture is compressed to form filling units 103. However, the density of the filling units 103 is not uniform in the thickness direction (pressure direction of the hot rollers) of the square material 120. Specifically, since the long wood segments 110 of the rotary-cut wood core have relatively high strength and are difficult to crush by the pressure of 2.2~2.3MPa, the long wood segments 110 provide a certain degree of protection for the mixture in the voids. Therefore, the mixture in the voids is also compressed, but the amount of compression is less than that of the mixture above the long wood segment layer in terms of thickness.

[0061] Step 5, Sawing process: Sawing the square piece 120 in a cutting direction perpendicular to the longitudinal direction of the long wood segment 110 to obtain the vertical wood board 100.

[0062] Step 6, Drying process: Dry the vertical wood boards to a moisture content of 12-14%, with an internal moisture content deviation of less than 2%. Example 5

[0063] The difference between Example 5 and Example 1 is that, referring to... Figure 6 As shown, the wood segment 101 is cylindrical in shape and is made from small-diameter timber processed by a rod mill. The filling unit 103 is a wood product formed by pressing wood fibers with a mixed adhesive. Meanwhile, referring to… Figure 7 As shown, the vertical wood board 100 is prepared through the following process steps.

[0064] Step 1, the process of assembling the blank: 10 long wood pieces 110 are taken, the cross-sectional shape of the long wood piece 110 is a circle with a radius of 5 cm, and the length of the long wood piece 110 is 2 m. On a continuous conveyor with baffles on both sides, the first layer of long wood piece layers is laid side by side to form a first intermediate product by filling the gaps between the long wood pieces 110 with a mixture. The mixture is a mixture of wood fibers and mixed adhesive, i.e. wood fibers after mixing with glue, and the fiber length of the wood fibers is 2-3 mm. Then, the second layer of long wood piece layers is laid side by side on the first intermediate product, and the mixture is again spread to fill the gaps between the long wood pieces 110 in the second layer of long wood piece layers to obtain a second intermediate product. The above process is repeated to stack a blank square material with 10 layers of long wood piece layers. In order to enable the mixture to be compressed, the thickness of the spread mixture should be greater than the thickness of the long wood piece layer, and the distance from the surface of the natural mixture layer formed by the mixture spread to the surface of the long wood piece layer is 10% of the thickness of the long wood piece layer, and the distance from the surface of the natural mixture layer formed by the mixture spread to the surface of the tenth layer of long wood piece layers is 30% of the thickness of the tenth layer of long wood piece layers. The shape of the long wood piece 110 falling on the conveyor is not limited, only the length direction parallel to the conveying direction is required, and under the action of gravity, the long wood pieces 110 in the upper and lower long wood piece layers are staggered.

[0065] Step 2, the process of pre-pressing: the blank square material is pre-pressed by multiple groups of pressure rollers under the condition of being limited on both sides, the temperature of the pressure rollers is normal temperature, the pressure is 1.1-1.2 MPa, and the multiple groups of pressure rollers can provide a continuous pressure of 1.5 min to the blank square material. The process of pre-pressing can promote the uniform distribution of the mixture in the gaps between adjacent long wood pieces 110.

[0066] Step 3, the process of preheating: the pre-pressed blank square material passes through a microwave heat tunnel, the internal temperature of the microwave heat tunnel is 90±2℃, and the temperature of the blank square material after leaving the microwave heat tunnel reaches 85±2℃.

[0067] Step 4, the process of pressing: pressure is applied to both the width and the sides of the blank square material to obtain a square material 120, and the pressure is provided by a molding machine. The temperature of the upper and lower hot plates of the molding machine is 125±2℃, and the pressure is 2.2-2.3 MPa. The temperature of the two hot plates on both sides of the molding machine is 90±2℃, and the pressure is 1.9-2.0 MPa. The pressing time is 10 min. In the process of pressing, in addition to the mixture being compressed to be densified, the long wood pieces 110 are also crushed due to the relatively loose material and are compressed.

[0068] The purpose of using different processes for pressing the two widths and the two sides in the pressing process is to reduce the compression amount in the width direction of the square material 120. The above-mentioned beneficial effects and their implementation methods will be explained in detail below by taking the production of floor boards as an example. The width and length directions of the square material of the prior art do not have differences, i.e., the size change rates in the width and length directions are the same, and the size change rates and compression rebound rates in the width and length directions of the vertical wood board 100 produced according to the method of Embodiment 1 or using the four-way isothermal pressing process are the same, and the size change rates and compression rebound rates in the width and length directions of the floor board pieces obtained by cutting the board are also the same. In actual installation, taking a square paving environment as an example, since there are more floor board pieces in the width direction of the paving, the width direction of the paving has more installation gaps, and there are very few floor board pieces in the length direction of the paving, and accordingly there are only very few installation gaps, but the installation gaps in the width direction and the length direction are actually equal. Because too large will affect the aesthetics, and too small will not be enough to play the role of reserving expansion space. At this time, the cumulative size changes that will occur in the width direction and the length direction of the paving are the same, so the cumulative size changes in the width direction are digested by a large number of installation gaps and do not cause obvious large gaps or arching problems, but the only two or three installation gaps in the length direction are not enough to digest the cumulative size changes, and therefore, after the floor board pieces shrink, there will be a larger gap in the length direction, or after swelling, arching will occur. This is a common problem in the field of wood flooring, especially in the field of laminate flooring.

[0069] In this embodiment, the compression of the square material 120 is partly achieved by a larger compression in the thickness direction of the blank square material, so that the compression in the thickness direction of the square material 120 is larger than that in the width direction. Specifically, the compression in the thickness direction of the square material 120 is larger than that in the width direction of the long wood piece 110 in the square material 120, so as to affect the compression resilience of the square material 120 as a whole, i.e. the compression resilience in the thickness direction of the square material 120 is larger than that in the width direction. After cutting, the thickness and width directions of the square material 120 are converted into the width and length directions of the vertical wood board 100. Thus, although the moisture expansion and shrinkage rates of the wood piece 101 or the partial wood piece 102 and the filling unit 103 are the same in the width and length directions, the compression resilience of the wood piece 101 or the partial wood piece 102 is different in the width and length directions, so that the dimensional change rates of the vertical wood board 100 in the width and length directions are no longer the same, and the vertical wood board 100 has differences in the width and length directions. At this time, the direction corresponding to the thickness direction of the square material 120 is defined as the width direction of the vertical wood board 100, and the direction corresponding to the width direction of the square material 120 is defined as the length direction of the vertical wood board 100, so as to take the directions as the direction reference. The cut floor board can have a relatively good dimensional stability in the length direction by sacrificing the dimensional stability in the width direction to a certain extent. In other words, the dimensional change rate and the compression resilience of the floor board in the length direction are smaller than those in the width direction, so as to reduce the cumulative dimensional change in the length direction. The pressed board is artificially made to have differences in the width and length directions by using the compression resilience characteristics of the wood piece 101, so as to overcome the defect that the dimensional changes in the three directions of the pressed board of the prior art are equal.

[0070] Step five, sawing process: the square material 120 is sawed in a cutting direction perpendicular to the longitudinal direction of the long wood piece 110, so as to obtain the vertical wood board 100.

[0071] Step six, drying process: the vertical wood board 100 is dried to a moisture content of 12-14%, and the internal moisture content deviation is less than 2%. Example 6

[0072] The difference between Example 6 and Example 5 is that, in the assembly process, the moisture content of the long wood segments 110 is 6-8%, the initial moisture content of the filler material (wood fiber) is 10-12%, and the moisture content after mixing with glue is 14-16%. Therefore, in the final drying process, the filler unit 103 basically does not undergo any dimensional changes, while the wood segments 101 and some wood segments 102 are in a tendency to expand or actually undergo a certain amount of expansion, thereby enabling the wood segments 101 and some wood segments 102 to be more tightly bonded in the assembly holes 104. On the other hand, regardless of whether the long wood segment 110 is crushed, the long wood segment 110 provides a certain degree of protection for the mixture in the gap. Therefore, although the mixture in the gap will also be compressed, the amount of compression is less than that of the mixture above or between the long wood segment layers in the thickness direction. At this time, if the wood segment 101 and part of the wood segment 102 are actually always in a tendency to expand, then obviously the filling unit 103 has enough space to be compressed again to accommodate and absorb the expansion of the wood segment 101 and part of the wood segment 102. Example 7

[0073] The difference between Example 7 and Example 6 is that, referring to... Figure 8 As shown, the longitudinal direction L0 of wood segments 101 and some wood segments 102 forms an angle of 60±5° with the surface of the vertical wood board 100. Specifically, the angle formed between the longitudinal direction L0 and the surface of the vertical wood board 100 is directional. Specifically, the plane formed by the axial directions of multiple wood segments 101 or some wood segments 102 arranged along the length of the vertical wood board 100 is perpendicular to the surface of the vertical wood board 100, and the plane formed by the axial directions of multiple wood segments 101 or some wood segments 102 arranged along the width of the vertical wood board 100 forms an angle of 60°±5° with the surface of the vertical wood board 100. Meanwhile, because wood segments 101 or some wood segments 102 have inter-wood differences, even if the boards are assembled in the same way, the angle between wood segments 101 or some wood segments 102 and the surface of the vertical wood board 100 obtained after angled sawing will differ; an error within 5° is acceptable.

[0074] Reference Figure 9 As shown, the vertical wood board 100 in this embodiment is obtained by sawing at a 30° angle to the side of the square wood board 120.

[0075] In this embodiment, the dimensional change of the vertical wood board 100 in the length direction is the vector sum of the dimensional changes of the longitudinal and transverse dimensions of the wood segment 101, so the dimensional change rate of the vertical wood board 100 in the length direction can be further reduced.

[0076] The product performance of the vertical wood boards 100 of Examples 1 to 7 is shown in the following table. The control group is a hexahedral vertical wood board made according to the technical solution disclosed in the Chinese invention patent with publication number CN104210013B.

[0077] Table 1. Product performance parameter table of the vertical wood boards 100 of Examples 1 to 7

[0078]

[0079] The foregoing description is for purposes of illustration only and is not intended to be limiting. Numerous implementations and variations thereof will become apparent to those skilled in the art in light of the foregoing description. The scope of the teachings thus includes not only the described examples, but also other examples and their equivalents without departing from the spirit or essential characteristics thereof. The only true limitation being set forth by the claims as they are interpreted in light of the prior art. For the purposes of this patent, all articles, patents, and references, including publications, manuscripts, reports, brochures, books, articles, computer programs, web postings, and databases, referenced herein are hereby incorporated by reference in their entireties. The omission of any aspect of the subject matter disclosed herein from any claim does not preclude that aspect from being claimed in any other claim that depends from the same base claim.

Claims

1. A vertical wood board, characterized by, The vertical wood board comprises a body unit and a filling unit, the body unit comprises a plurality of wood segments and / or partial wood segments arranged in an array, the longitudinal direction of the wood segments and / or the partial wood segments is at an angle with the surface of the vertical wood board; the filling unit is a mixture of filling material and adhesive, which is compacted and filled into the gaps between the adjacent wood segments and / or the partial wood segments and bonds the wood segments and / or the partial wood segments. The vertical wood board is prepared by the following method: I. A blank assembling process, long wood segments are taken and laid side by side to form a long wood segment layer, and the mixture is spread to fill the gaps between the long wood segments to obtain a first intermediate product; II. A pre-compaction process, the first intermediate product is pre- compacted under a pressure of 0.8-1.3 MPa at room temperature for 0.5-2 min; III. A pre-heating process, the temperature of the first intermediate product after pre-compaction is raised to 80-90℃; IV. A compaction process, pressure is applied to both sides of the first intermediate product to make the mixture more compact, and the mixture is bonded with the long wood segments to form a square material, wherein the compaction temperature is 120-130℃, the compaction pressure is 2.0-2.5 MPa, and the compaction time is 10-15 min; V. A sawing process, the square material is sawed in a cutting direction at an angle with the longitudinal direction of the long wood segments to obtain the vertical wood board; VI. A drying process, the vertical wood board is dried to a moisture content of 12-14%, and the internal moisture content deviation is less than 2%.

2. The vertical wood board according to claim 1, wherein The longitudinal direction of the wood segments and / or the partial wood segments is at an angle of 50-90° with the surface of the vertical wood board.

3. The vertical wood board according to claim 2, wherein The longitudinal direction of the wood segments and / or the partial wood segments is perpendicular to the surface of the vertical wood board.

4. The vertical wood board according to claim 1, wherein The wood segments are cylinders, prisms, cubes or elliptical cylinders; the partial wood segments are partial cylinders, partial prisms, partial cubes or partial elliptical cylinders.

5. The vertical wood board according to claim 1, wherein The filling material is a mixture of one or more of particles, chips or fibers.

6. The vertical wood board according to claim 1, wherein In the blank assembling process, the moisture content of the long wood segments is 6-8%.

7. The vertical wood board according to claim 1, wherein In the blank assembling process, the thickness of the spread mixture is greater than the thickness of the long wood segment layer.

8. The vertical wood board according to claim 1 or 7, wherein In the blank assembling process, a second layer of long wood segment layer is laid on the first intermediate product, and then the mixture is spread again to fill the gaps between the long wood segments in the second layer of long wood segment layer to obtain a second intermediate product, and the above steps are repeated at least once to obtain a green square material; and, The total thickness of the spread mixture is greater than the thickness of the two layers of long wood segment layer. The long wood segments in the two layers of long wood segment layer are staggered.

9. The vertical wood board according to claim 8, wherein In the pre-compaction process, the pre-compaction force is applied to both sides of the green square material; in the compaction process, the compaction force is applied to both sides and both sides of the green square material; The temperature of the compaction force applied to both sides of the green square material is 85-95℃, and the pressure is 1.8-2.2 MPa.

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