A wooden multi-layer profile and preparation method thereof

Abstract

The present application discloses a multi-layered wooden profile and a method for preparing the same, comprising at least a top panel, a core panel, and a bottom panel adhesively connected to each other. The core panel comprises a plurality of curved core panel strips wavy across their width; the curved core panel strips are vertically arranged, their width constituting the thickness of the core panel; and the plurality of curved core panel strips are arranged transversely and extend to form the width of the core panel. The core panel in this technical solution utilizes core panel strips that have become wavy due to drying shrinkage, thereby fully utilizing drying waste, saving material, and requiring lower drying quality, thereby shortening drying time and reducing drying energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of wooden profile preparation technology, and more specifically, to a wooden multi-layer profile; the present invention also relates to a method for preparing the wooden multi-layer profile. Background Art

[0002] Some multi-layered wood profiles include at least one surface panel, at least one bottom panel, and a core panel. For example, a three-layered wood profile includes a surface panel, a bottom panel, and a core panel. The core panel is made from a series of closely arranged core panel strips. These strips are often made from fast-growing veneer that is further cut into strips.

[0003] For example, the utility model patent with the publication number CN206987292U in the Chinese patent database and the name "A three-layer composite wood floor" discloses a structure including a base plate, processed corner square panels, and a floor panel. Among them, the processed corner square panels are assembled from several small corner square panels. This technical solution can make better use of scrap waste.

[0004] For example, the utility model patent with announcement number CN202559654U and name "Three-layer solid wood flooring with wooden strips on all sides and horizontal core material" discloses a structure including a surface board, a core board and a back board, wherein the core board is composed of wooden strips with edge banding on both sides, wooden strips with edge banding at both ends and horizontal wooden strips in the middle. This technical solution has relatively good dimensional stability and can be used in geothermal environments.

[0005] However, the core layer of the first prior art mentioned above is made of scraps, and the size and structure of the scraps vary greatly, which is not conducive to large-scale mass production. Therefore, in order to achieve mass production of wooden profiles with three-layer or multi-layer structures in the prior art, the dried veneer is often directly sawed into strips and then re-glued into core boards, such as the technical solution of the second prior art mentioned above. Although the above solution can achieve mass production, on the one hand, since the core board strips are blocked by the surface board and the bottom board, the beauty of their shape is relatively small from a practical point of view. On the other hand, it is difficult to dry the fast-growing veneer to keep it flat. Generally speaking, a relatively soft drying base needs to be used, but this will consume relatively long drying time and drying energy. Even if a soft base is used for drying, there will still be a certain amount of veneer that cannot be used in the preparation of multi-layer profiles of the prior art due to drying shrinkage, thus resulting in waste.

[0006] Based on this, the prior art lacks a structure of a wooden multi-layer profile that can utilize dried veneer of fast-growing wood that produces shrinkage. Summary of the Invention

[0007] The present application provides a wooden multi-layer profile and also provides a method for preparing the wooden multi-layer profile.

[0008] In one aspect of the present application, a wooden multi-layer profile is provided, comprising at least a surface panel, a core panel and a bottom panel that are glued to each other, wherein the core panel comprises a plurality of curved core panel strips that are wavy on their surface; the curved core panel strips are vertically arranged, and their width constitutes the thickness of the core panel; a plurality of the curved core panel strips are arranged and extended transversely to constitute the width of the core panel.

[0009] In some embodiments, the thickness of the surface panel is 3-20 mm, and the thickness of the curved core strip is 2-5 mm.

[0010] In some embodiments, the core panel further comprises straight core panel strips, which are arranged vertically and whose width constitutes the thickness of the core panel.

[0011] In some embodiments, the curved core strips are spaced apart from two adjacent straight core strips, and the curved core strips are partially abutted against the straight core strips and are adhesively connected at the abutment.

[0012] In some embodiments, the core panel includes a first curved core panel strip and a second curved core panel strip, wherein the first curved core panel strip is wavy along its width direction and the second curved core panel strip is wavy along its length direction.

[0013] In some embodiments, the first curved core panel strips and the second curved core panel strips are alternately arranged, partially abutted against each other, and are adhesively connected at the abutting points.

[0014] In some embodiments, the wood fibers of the first curved core strip and the second curved core strip are perpendicular to each other.

[0015] Another aspect of the present application provides a method for preparing the aforementioned wooden multi-layer profile, comprising the following steps:

[0016] (a) a material preparation step, preparing the surface plate, the core plate, and the bottom plate in no particular order;

[0017] (b) applying glue on both surfaces of the core plate;

[0018] (c) a pressing step of placing the surface plate and the bottom plate on and below the core plate, respectively, and curing the adhesive under pressure to produce the wooden multi-layer profile;

[0019] The preparation of the core plate includes the following steps:

[0020] (i) drying a veneer of a fast-growing wood to obtain a dry curved veneer in a wavy shape;

[0021] (ii) after gluing both sides of the dried curved veneers, stacking a plurality of the dried curved veneers in a manner such that the wood fiber directions of two adjacent layers of the dried curved veneers are crisscrossed to obtain a blank block; or stacking a plurality of the dried curved veneers with a dried straight veneer in a manner such that the wood fiber directions of the dried curved veneers and the dried straight veneer are crisscrossed to obtain the blank block;

[0022] (iii) contacting the surface and bottom of the block with a pressing plate under pressure or without pressure, and solidifying the block under hot pressing or cold pressing to obtain the block;

[0023] (iv) cutting the square material to obtain the core board.

[0024] In some embodiments, in step (i), the veneer of the fast-growing wood is rapidly dried to obtain a dried veneer, wherein the dried veneer has a wave shape extending perpendicularly or at an acute angle to the direction of the wood fibers due to shrinkage.

[0025] In some embodiments, in step (i), the fast-growing wood veneer is placed between hot pressing plates with wavy surfaces for drying to obtain a dried veneer, wherein the dried veneer has a wavy shape due to deformation caused by hot pressing.

[0026] In some embodiments, in step (i), the moisture content of the dried curved veneer is 8-10%.

[0027] In some embodiments, in step (c), the pressing step is performed by a hot pressing process; wherein, the moisture content of the surface plate and the bottom plate is 8-10%, the temperature of the hot pressing plate is raised to 180-240°C, and pressurization is applied after preheating for 2-7s / mm, with a pressure of 3.5-4.0MPa and a compression rate of 1-5%, and the pressure is maintained for 30-60s after reaching the set compression rate.

[0028] In summary, compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. The core board of the technical solution of the present application is composed of curved core board strips, and there are gaps between the curved core board strips instead of being tightly spliced. Therefore, on one hand, it can reduce the weight of the wooden multi-layer profile of the technical solution of the present application, and is a lightweight material. On the other hand, since the curved core board strips are vertically arranged to support the surface board and the bottom board, they have relatively good mechanical strength.

[0030] 2. Furthermore, the thermal insulation effect of the wooden multi-layer profile of the applied technical solution is improved by the gaps between the core strips.

[0031] 3. Furthermore, in some embodiments of the present application, core strips that have formed waves due to drying shrinkage are utilized, so that drying waste can be fully utilized and materials can be saved; at the same time, the drying quality requirements for the dried veneer used to prepare the core strips are relatively low, so the drying time can be shortened and the drying energy consumption can be reduced.

[0032] 4. The preparation method of the technical solution of the present application, through the method of step (c), can cause the surface of the surface plate and / or bottom plate that contacts the core plate strip to undergo a slight densification and compression, and cause the gluing surface of the core plate strip to undergo a slight densification and compression, thereby obtaining a relatively flat gluing surface and improving the gluing strength; at the same time, the gluing surface of the surface plate and / or bottom plate can be made wavy to alleviate the traces of the core plate strip printed on the surface of the surface plate and / or bottom plate due to the deformation of the core plate strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0034] Figure 1 This is a schematic diagram of the process flow for preparing the core board of Example 1 of the present application.

[0035] Figure 2 This is a schematic structural diagram of the wooden multi-layer profile of Example 1 of the present application.

[0036] Figure 3 This is a schematic structural diagram of the assembled square material of Example 4 of the present application.

[0037] Figure 4 This is a schematic structural diagram of the wooden multi-layer profile of Example 4 of the present application.

[0038] Figure 5 This is a schematic structural diagram of the wooden multi-layer profile of Example 6 of the present application.

[0039] Figure 6 for Figure 5 A partial enlarged view of the .

[0040] In the figure: 100, surface plate, 200, core plate, 300, bottom plate, 210, veneer, 220, dried curved veneer, 230, assembled square material, 250, dried straight veneer, 201, first curved core plate strip, 202, second curved core plate strip, 203, curved core plate strip, 204, straight core plate strip, 301, first compression layer, 302, second compression layer. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application. Example 1

[0042] A method for preparing a wooden multi-layer profile, which mainly comprises the following steps:

[0043] (a) In the step of preparing materials, the surface plate 100, the core plate 200 and the bottom plate 300 are prepared in no particular order;

[0044] (b) applying glue on both surfaces of the core board 200;

[0045] (c) A pressing step in which the surface plate 100 and the bottom plate 300 are placed on and below the core plate 200, respectively, and the adhesive is cured under pressure to produce a wooden multi-layer profile.

[0046] Specifically, the surface plate 100 and the bottom plate 300 are both 6 mm thick fir wood boards, which are dried to a moisture content of 8-10% according to the existing drying method. The moisture content deviation in the surface plate 100 and the bottom plate 300 is less than 1%, and the surface flatness is less than 0.2 mm / m.

[0047] The core board 200 is made of a plurality of 3mm thick fast-growing wood (fir) veneers 210, referring to Figure 1 As shown, its preparation process specifically includes the following steps:

[0048] (i) The veneer 210 obtained by rotary cutting or sawing is placed between hot pressing plates with wavy surfaces, where both the upper pressing plate and the lower pressing plate are hot pressing plates. During the hot pressing process, the veneer 210 is dried to a moisture content of 8-10% and has a wavy shape that is the same as the wavy surface shape of the hot pressing plates, thereby obtaining a dried curved veneer 220.

[0049] (ii) After applying glue to both sides of the dried, curved veneer sheets 220, multiple layers of dried, curved veneer sheets 220 are stacked in a manner such that the wood fibers of adjacent layers of dried, curved veneer sheets 220 are crisscrossed to form a blank block 230. Because the dried, curved veneer sheets 220 have a wavy shape, the adhesive is preferably applied only to the wavy protrusions of the dried, curved veneer sheets 220 using a roller coating method. During roller coating, the dried, curved veneer sheets 220 are slightly pressed down 2-3 mm to facilitate adequate application of the adhesive. Subsequently, 40 layers of dried, curved veneer sheets 220 are stacked in a crisscross pattern to form a blank block 230.

[0050] (iii) The pressing plate contacts the top and bottom surfaces of the assembled square material 230 without pressure. Slight pressure is also acceptable, but the weight of the dried, bent single sheet 220 is primarily used to maintain the shape of the assembled square material 230 until the adhesive cures and the assembled square material 230 reaches a certain strength. Curing is performed under hot or cold pressing conditions to obtain the square material. The curing temperature depends on the type of adhesive used. In this embodiment, a phenolic resin adhesive is used, so a pressing plate temperature of 180°C is used to cure the adhesive in the assembled square material 230.

[0051] (iv) Cutting the square material to obtain the core board 200. A frame saw or a multi-blade saw can be used. The square material is placed on the cutting table of the saw machine, and the band saw blade or saw blade is perpendicular to the angle of the table. The core board 200 is sawed at this cutting angle. After cutting, the thickness of the square material constitutes the width of the core board 200, and the cutting width constitutes the thickness of the core board 200. In this embodiment, the cutting width is 12 mm. The length of the square material is still the length of the core board 200.

[0052] In step (c), since the surface of the core board 200 is not a flat and dense surface, it is advisable to apply the adhesive to the upper and lower surfaces of the core board 200 by roller coating, using white glue; then place the bottom plate 300 on the lower plate of the press, align the core board 200 and place it on the bottom plate 300, and align the surface plate 100 and place it on the core board 200; finally, press down the upper plate, both the upper and lower plates are cold plates, the upper plate pressure is 1.5MPa, and it is maintained for 35 minutes.

[0053] By the above method, we can obtain Figure 2 The illustrated wood multi-layer profile includes a top panel 100, a core panel 200, and a bottom panel 300 that are glued together. Specifically, the core panel 200 includes a first curved core panel strip 201 and a second curved core panel strip 202. The first curved core panel strip 201 is wavy along its width, and the second curved core panel strip 202 is wavy along its length. First, because the square lumber is obtained by gluing and pressing, the first curved core panel strips 201 and the second curved core panel strips 202 are alternately arranged, partially abutting each other, and glued together at the abutting points. Second, because the veneers 210 are stacked in a crisscross pattern during assembly, the wood fibers of the first curved core panel strips 201 and the second curved core panel strips 202 run perpendicular to each other. Third, because the core panel 200 is obtained by cutting the square lumber, the first curved core panel strips 201 and the second curved core panel strips 202 in the core panel 200 are both arranged vertically.

[0054] Due to the aforementioned structure, the dried, curved veneer 220 of this embodiment is wavy in shape. Therefore, even after lamination and pressing, gaps remain between adjacent layers. This results in gaps between the curved core strips 201 and 202, rather than being tightly joined. This reduces the weight of the multi-layered wood profile of this embodiment, making it lightweight. Furthermore, because the curved core strips 201 and 202 are vertically arranged to support the top panel 100 and bottom panel 300, the profile has relatively good mechanical strength. Furthermore, the gaps between the curved core strips 201 and 202 provide the multi-layered wood profile of this embodiment with relatively good thermal insulation. Example 2

[0055] The difference between Example 2 and Example 1 is that the material used for the surface panel 100, core panel 200, and bottom panel 300 is poplar wood, and the surface panel 100 and bottom panel 300 are both 15 mm thick poplar wood veneers; the core panel 200 is prepared using a 4 mm thick poplar wood veneer 210, and the thickness of the core panel 200 is 15 mm. Example 3

[0056] The difference between Example 3 and Example 1 is that the material used for the surface panel 100, core panel 200, and bottom panel 300 is poplar wood, and the surface panel 100 and bottom panel 300 are both 10 mm thick poplar wood veneers; the core panel 200 is prepared using a 3 mm thick poplar wood veneer 210, and the thickness of the core panel 200 is 20 mm. Example 4

[0057] The difference between Example 4 and Example 1 is that 20 pieces of veneers 210 are taken and dried according to the same method as Example 1 to obtain dried curved veneers 220, and another 21 pieces of veneers 210 are taken and hot-pressed to obtain dried straight veneers 250. The moisture content of both after drying is 8-10%.

[0058] The dry curved veneer 220 and the dry straight veneer 250 are stacked in a crisscross manner so that the wood fiber direction is crisscrossed to obtain the blank block 230. The dry curved veneer 220 is coated with adhesive only on the wavy protrusions of the dry curved veneer 220 by roller coating. The dry straight veneer 250 can be coated with adhesive in a normal manner. Of course, it is also possible to apply glue only to the dry curved veneer 220. Then, 20 layers of dry curved veneer 220 and 21 layers of dry straight veneer 250 are stacked and crisscrossed to obtain a reference Figure 3 The assembled square material 230 is shown.

[0059] Since both the dried curved veneer 220 and the dried straight veneer 250 are used, the structure of the wooden multilayer profile obtained by the process of Example 4 is similar to that of the embodiment 4. Figure 4As shown, the core panel 200 includes wavy curved core panel strips 203 and straight core panel strips 204. The curved core panel strips 203 and straight core panel strips 204 are both arranged vertically, and their widths constitute the thickness of the core panel 200. Because the dried curved veneer sheets 220 and the dried straight veneer sheets 250 are alternately stacked when preparing the assembled square material 230, the curved core panel strips 203 space between two adjacent straight core panel strips 204, and the curved core panel strips 203 and the straight core panel strips 204 partially abut against each other and are adhesively connected at the abutting points. Example 5

[0060] The difference between Example 5 and Example 1 is that the material used for the surface panel 100, the core panel 200, and the bottom panel 300 is eucalyptus, and the surface panel 100 and the bottom panel 300 are both 10 mm thick eucalyptus veneer; the core panel 200 is prepared using a 3 mm thick eucalyptus veneer 210, and the thickness of the core panel 200 is 20 mm.

[0061] The core board 200 is made of multiple 4 mm thick eucalyptus veneers 210. The preparation process specifically includes the following steps:

[0062] (i) The sliced ​​veneer 210 is rapidly dried to obtain a dried, curved veneer 220. There are many methods for rapid drying, such as placing the veneer 210 in a drying kiln or other indoor environment and drying it at 60°C / 70% RH to a moisture content of 8-10%. Because a relatively hard drying base is used, the drying speed is extremely fast. As the moisture content rapidly decreases, the veneer 210 undergoes a certain degree of shrinkage. As a result, the dried veneer 210 has a wavy shape that extends perpendicular to or at an acute angle to the direction of its wood fibers. Those skilled in the art will appreciate that the specific shape of the wavy shape, such as the curvature and the angle with the wood fiber direction, varies depending on factors such as the initial moisture content of the wet eucalyptus wood and the cutting position of the veneer 210. However, it is clear that the veneer 210 obtained after drying is a dried, shrunken veneer, resulting in a dried, curved veneer 220. Of course, the dried curved veneer 220 of this embodiment is obviously different from the dried curved veneer 220 obtained by the means of Example 1. The wave shape of the dried curved veneer 220 of this embodiment may be irregular, and only has a rough wave shape.

[0063] Then, the wooden multilayer profile of this embodiment prepared in the same manner as in Example 1 has the same Figure 2 The structure is roughly the same, but the wave shape of the first curved core strip 201 and the second curved core strip 202 is irregular, and only has a legal wave shape.

[0064] In particular, the core panel 200 of this embodiment utilizes curved core strips 201, 202 that have become corrugated due to drying shrinkage. This fully utilizes drying waste, conserving wood materials, reducing production and manufacturing costs, and achieving high-value-added utilization of wood waste. Furthermore, the drying quality requirements for the veneer 210 used to make the curved core strips 201, 202 are relatively low, thereby shortening drying time and reducing drying energy consumption. Example 6

[0065] Example 6 differs from Example 1 in that both the top panel 100 and the bottom panel 300 are 3 mm thick poplar veneers, dried using conventional methods to a moisture content of 8-10%. The moisture content within the poplar veneer varies less than 1%, and the flatness of the poplar veneer is less than 0.2 mm / m. The core panel 200 is made of multiple 2 mm thick poplar veneers 210, and has a thickness of 12 mm.

[0066] In particular, in step (c), a hot press is used to perform the pressing step. First, the temperature of the hot press plate is raised to 200°C. Then, the assembled three-layer structure is placed on the hot press. The upper and lower press plates are closed and contact the three-layer structure without pressure, and then preheated for 90 seconds. Then, pressure is applied at 3.5 MPa until the upper press plate contacts the thickness gauge. The compression rate at this point is 3%. After reaching the set compression rate, the pressure is maintained for 50 seconds. Then, the pressure is maintained for 30 minutes. At this time, there is no need to continue to supply heat to the hot press plate. In other words, the press plate is in a cooling state. Finally, the pressure is released to obtain the wooden multi-layer profile of this embodiment.

[0067] Reference Figure 5 、 Figure 6 As shown, since the three-layer structure of this embodiment is implemented through a hot pressing process and a preheating period of a certain length is set, the parts of the surface plate 100 and the bottom plate 300 that are in contact with the first curved core plate strip 201 and the second curved core plate strip 202 are slightly compressed to form a first compression layer 301, and the parts of the first curved core plate strip 201 and the second curved core plate strip 202 that are in contact with the surface plate 100 and the bottom plate 300 are slightly compressed to form a second compression layer 302.

[0068] Specifically, the three-layer structural profile of the core board made of curtain-like wood core strips is to avoid the shape of the core layer's wood core strips being printed on the surface board 100. For example, the utility model patent with the announcement number CN205577343U in the Chinese patent database and the name "A Three-layer Solid Wood Composite Floor" discloses: The core board of the three-layer solid wood composite floor is generally made of small wooden strips spliced ​​together. There are differences in material, density, etc. between each small wooden strip, and the size of the assembly gap between adjacent wooden strips is inconsistent, resulting in the core board being unable to effectively release stress after absorbing moisture, causing height differences between the core board strips, and then appearing as "wave patterns" perpendicular to the length direction of the floor on the board surface, affecting the service life of the floor. For this reason, the existing technology often uses a relatively thick surface board 100, which on one hand increases the requirements for the material of the surface board 100, and on the other hand also increases the drying requirements of the surface board 100.

[0069] However, the inventors found that in addition to the wavy lines on the surface caused by the gaps between the core strips, the main factor is that the moisture in the adhesive migrates to the surface when the adhesive cures, and is reflected on the surface due to the lower thickness of the surface panel, thus forming watermarks on the surface.

[0070] Based on this, the applicant adopts thermosetting adhesive and uses a hot pressing process. In particular, preheating is set before pressing, so the moisture in the surface panel 100 first migrates to the glue layer, and due to the barrier of the glue layer, it stays on the bonding surface of the surface panel 100 and the glue layer, thereby increasing the moisture content of the thickness layer near the bonding surface; at the same time, since the glue layer also has the function of blocking temperature, the moisture in the glue layer migrates to the bonding surface of the curved core panel strips 201, 202 and the glue layer under the action of its own weight, thereby increasing the moisture content of the thickness layer near the bonding surface, and when the preheating time arrives, the temperature of the thickness layer near the bonding surface of the curved core panel strips 201, 202 also reaches above 180°C; finally, when the press applies pressure, in the three-layer structure, the thickness layer near the bonding surface of the surface panel 100 and the thickness layer near the bonding surface of the curved core panel strips 201, 202 have the highest moisture content and soften first, thereby causing a slight densification compression at these two locations to form compression layers 301, 302. The curing and compression of the adhesive on the bottom plate 300 is similar. As a result, (1) a relatively flat bonding surface can be obtained, thereby improving the bonding strength; (2) because the moisture in the adhesive only migrates toward the curved core strips 201, 202 and does not migrate toward the surface plate 100, the problem of watermarks on the surface can be more effectively avoided, thereby enabling the use of relatively thin materials for the preparation of the surface plate 100, such as 3-4 mm thick boards; (3) the bonding surfaces of the surface plate 100, the bottom plate 300, and the core plate 200 can be made wavy, thereby alleviating the mark of the core strips on the surface of the surface plate 100 and the bottom plate 300 due to the deformation of the curved core strips 201, 202. Example 7

[0071] The difference between Example 7 and Example 6 is that the assembled square material 230 is assembled by alternately stacking dried curved veneers 220 and dried straight veneers 250, so the core panel 200 includes curved core panel strips 203 and straight core panel strips 204.

[0072] The product properties of the wooden multi-layer profiles of Examples 1 to 7 are shown in Table 1.

[0073] Table 1. Product properties of wooden multilayer profiles of Examples 1 to 7

[0074] Group Moisture content Static bending strength elastic modulus Surface flatness Example 1 8-10% 34.0MPa 5125MPa 3mm / m Example 2 8-10% 42.0MPa 5500MPa 3mm / m Example 3 8-10% 36.0MPa 4800MPa 3.5mm / m Example 4 8-10% 31.0MPa 4500MPa 3.5mm / m Example 5 8-10% 40.0MPa 5350MPa 3mm / m Example 6 8-10% 30.0MPa 4150MPa 5.5mm / m Example 7 8-10% 30.0MPa 4050MPa 5.5mm / m

[0075] The above description is intended to be illustrative and not limiting. Many embodiments and applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the appended claims and the full scope of equivalents to which such claims are entitled. For the purpose of completeness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein from the preceding claims is not a disclaimer of such subject matter, nor should it be considered that the applicants did not consider such subject matter to be part of the disclosed subject matter.

Claims

1. A wooden multi-layer profile, comprising at least a surface plate, a core plate and a bottom plate connected to each other by adhesive bonding, characterized in that: The core board includes a plurality of curved core board strips with a wave shape on its width; the curved core board strips are arranged vertically, and their width constitutes the thickness of the core board; the plurality of curved core board strips are arranged and extended transversely to constitute the width of the core board; The method for preparing the wooden multi-layer profile comprises the following steps: (a) preparing materials, preparing the surface plate, the core plate, and the bottom plate in no particular order, wherein the thickness of the surface plate is 3-4 mm; (b) applying glue on both surfaces of the core plate; (c) a pressing step of placing the surface plate and the bottom plate on and below the core plate, respectively, and curing the adhesive under pressure to produce the wooden multi-layer profile; The preparation of the core plate includes the following steps: (i) drying a veneer of a fast-growing wood to obtain a dry curved veneer in a wavy shape; (ii) after gluing both sides of the dried curved veneers, stacking a plurality of the dried curved veneers in a manner such that the wood fiber directions of two adjacent layers of the dried curved veneers are crisscrossed to obtain a blank block; or stacking a plurality of the dried curved veneers with a dried straight veneer in a manner such that the wood fiber directions of the dried curved veneers and the dried straight veneer are crisscrossed to obtain the blank block; (iii) contacting the surface and bottom of the assembled blank under pressure or no pressure with a pressing plate, and solidifying the blank under hot pressing or cold pressing to obtain the blank; (iv) cutting the square material to obtain the core plate; In step (i), the moisture content of the dried curved veneer is 8-10%; In step (c), the pressing step is implemented by a hot pressing process; wherein, the moisture content of the surface plate and the bottom plate is 8-10%, the temperature of the hot pressing plate is raised to 180-240°C, and pressurized after preheating for 2-7s / mm, with a pressure of 3.5-4.0MPa and a compression rate of 1-5%. After reaching the set compression rate, the pressure is maintained for 30-60s; then, the pressure is maintained for 30min, and the heat supply to the hot pressing plate is stopped; finally, the pressure is released to obtain the wooden multi-layer profile.

Images