Recombined bamboo with controllable transverse arc length and radian and preparation method thereof

Abstract

The invention relates to the technical field of recombined bamboos, and discloses a recombined bamboo with controllable transverse arc length and radian and a preparation method thereof, and the preparation method comprises the following steps: 1) brooming; 2) weaving; 3) drying; (4) gum dipping; 5) drying; (6) gradient paving; (7) hot press forming is conducted, specifically, the gradient laid bamboo bundle veneers are placed in a hot press to be subjected to hot press forming; (8) cold pressing arc forming is conducted, specifically, after hot pressing is completed, the recombined bamboos are placed in an arc fixing press to be subjected to cold pressing arc fixing; the lower pressing plate is fixed, the upper pressing plate applies pressure downwards at the speed of 0.2-0.5 mm / s, the pressure is maintained to be 8-10 MPa, and the pressure is maintained for 20 min; and (9) plate unloading is conducted, specifically, after the temperature of the arc-shaped recombined bamboos is reduced to 40 DEG C or below, plate unloading is conducted from cold pressing, and the arc-shaped recombined bamboos are stacked on arc-shaped plates till the water According to the preparation method of the recombined bamboo with the controllable transverse arc length and radian, stress is concentrated in the bending direction through gradient paving and arc-shaped paving of bamboo bundle veneers; arc recombined bamboos are prepared by means of the warping phenomenon of the bamboo bundle veneers; and the transverse strength and toughness of the arc-shaped recombined bamboo are improved by adding a tough material.

Description

Technical Field

[0001] The invention relates to the technical field of recombinant bamboo, in particular to a recombinant bamboo with controllable transverse arc length and curvature and a preparation method thereof. Background Art

[0002] Reconstructed bamboo is mainly a biomass material made of bamboo bundles or bamboo bundle fiber veneers as the matrix phase and phenolic resin as the reinforcement phase, which is made by hot pressing and gluing. At present, the reconstructed bamboo boards produced are mainly flat plates, and they are required to have low warping. This type of material is mainly used in outdoor floors, container bottom plates, landscape decorations, road guardrails and other fields. However, some decorative materials, furniture components, etc. have a certain demand for curved boards. Therefore, the development of curved reconstructed bamboo is expected to meet the use needs of more scenarios, increase the added value of the product, and broaden the application field of reconstructed bamboo.

[0003] Bamboo is a natural non-homogeneous biomass material with a gradient structure. When it absorbs moisture in the natural environment, it will produce obvious warping. Although the bamboo bundles have been treated with brooming and debonding, the gradient structure has been destroyed to a certain extent, but the asymmetric structure still has warping. Therefore, during the paving process of reconstructed bamboo, it will be laid as evenly as possible to ensure the symmetry of the structure and reduce the possibility of warping. However, after being processed into reconstructed bamboo, warping will also occur, and the warping is mainly horizontal. Therefore, when using reconstructed bamboo, it will be processed into long strips to alleviate its warping behavior.

[0004] Therefore, there is a need for a reconstructed bamboo with controllable transverse arc length and curvature and a preparation method thereof. The present invention aims to prepare arc-shaped reconstructed bamboo by curtain splicing, ply structure design and curved surface forming. Curtain splicing refers to the customizable arc length by transversely weaving bamboo bundles; ply structure design refers to degrading the uniform paving in the reconstructed bamboo production line into non-uniform paving. Specifically, the bottom bamboo bundles are closely arranged, the transverse gap between the core layer and the surface bamboo bundles gradually increases, and poplar veneers are added at appropriate positions to increase the transverse strength and toughness; after hot pressing, arc-fixed cold pressing is used to release stress according to the transverse gap of the bamboo bundles to shape them, thereby obtaining arc-shaped reconstructed bamboo; the curved surface forming process refers to the bamboo bundles being evenly laid in the curved lower pressing plate, and the curvature of the upper pressing plate is consistent with that of the lower pressing plate; the hot pressing forming-cooling and pressure-maintaining shaping steps are completed in the hot press to obtain arc-shaped reconstructed bamboo. Summary of the invention

[0005] The object of the present invention is to provide a reconstructed bamboo with controllable transverse arc length and arc and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a method for preparing reconstructed bamboo with controllable lateral arc length and arc, comprising the following steps:

[0007] 1) Bamboo strips are treated to remove green and yellow parts, and then soft bamboo bundles are obtained after bamboo strips are treated to remove green and yellow parts;

[0008] 2) Weaving: The bamboo bundles are woven by a weaving machine. During the weaving process, the lateral gaps of the bamboo bundles are controlled. The bamboo bundles can be divided into tightly arranged bamboo bundles veneers, which are recorded as Class A, relatively tightly arranged bamboo bundles veneers, which are recorded as Class B, relatively loosely arranged bamboo bundles veneers, which are recorded as Class C, and loosely arranged bamboo bundles veneers, which are recorded as Class D. The length of the bamboo bundle veneer is 2400 mm, and the width can be woven according to the needs;

[0009] 3) Drying: Dry the A, B, C, and D bamboo bundle veneers to control the moisture content to 10-15%;

[0010] 4) Dipping in glue: The dried bamboo veneer is placed in a glue pool for dipping in glue. The solid content of the glue pool is about 20%, and the glue liquid is a phenolic resin adhesive;

[0011] 5) Drying: Dry the bamboo veneer after dipping, and control the moisture content to 10-15%;

[0012] 6) Gradient paving: The specific method of gradient paving of bamboo bundle veneer is that the A-type bamboo bundle veneer is placed at the bottom layer, and the core layer to the surface layer of bamboo bundle veneer are B, C, and D types in sequence, showing a gradient distribution from compact to loose; Since the transverse strength of bamboo bundle veneer is weak, it can be improved by adding toughness material at appropriate positions;

[0013] 7) Hot pressing: placing the gradient paved bamboo bundle veneer in a hot press for hot pressing;

[0014] 8) Cold pressing to form an arc: After the hot pressing is completed, the reconstructed bamboo is placed in an arc-fixing press for cold pressing and arc-fixing; the lower pressing plate is fixed, and the upper pressing plate applies pressure downward at a rate of 0.2-0.5 mm / s, and the direction of the pressure is consistent with the direction of moisture absorption and warping of the reconstructed bamboo; after the upper and lower pressing plates are tightly attached to the reconstructed bamboo, continue to apply pressure, maintain the pressure at 8-10 MPa, and maintain the pressure for 20 minutes; during the pressure-maintaining process, cool water is introduced for cooling treatment;

[0015] 9) Unloading boards: After the curved reconstructed bamboo is cooled to below 40℃, the boards are unloaded from the cold press and stacked on curved boards to achieve a balanced moisture content.

[0016] Furthermore, the gap between the bamboo bundles of the closely arranged bamboo bundle veneer is 0-1 mm.

[0017] Furthermore, the gap between the bamboo bundles of the relatively closely arranged bamboo bundle veneer is 1-3 mm.

[0018] Furthermore, the gap between the bamboo bundles of the relatively loosely arranged bamboo bundle veneer is 3-6 mm.

[0019] Furthermore, the gap between the bamboo bundles of the loosely arranged bamboo bundle veneer is 6-10 mm.

[0020] The present invention also provides a recombinant bamboo obtained by the preparation method of the recombinant bamboo with controllable transverse arc length and curvature described in the above technical solution, wherein the curvature range of the recombinant bamboo is 0-1 rad.

[0021] Compared with the prior art, the invention has the following beneficial effects: the preparation method of the controllable transverse arc length and curvature reconstructed bamboo concentrates stress in the bending direction by gradient paving and arc paving of bamboo bundle veneers; arc-shaped reconstructed bamboo is prepared by utilizing the warping phenomenon of bamboo bundle veneers themselves; the transverse strength and toughness of the arc-shaped reconstructed bamboo are increased by adding tough materials (poplar veneer, glass fiber, etc.); arc-shaped reconstructed bamboo of different thicknesses and curvatures can be designed; and large-sized arc-shaped reconstructed bamboo can be produced;

[0022] The recombinant bamboo produced based on the preparation method of recombinant bamboo with controllable transverse arc length and curvature is an one-piece arc-shaped recombinant bamboo material. Compared with traditional flat recombinant bamboo, it has exclusive application fields, such as arc-shaped exterior wall panels, arc-shaped curved furniture, arc-shaped curved panels, arc-shaped decorative panels, etc. The arc-shaped recombinant bamboo can be customized according to demand with an arc range of 0-1rad, and has better integrity and strength than spliced ​​arc panels. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0024] Figure 1 This is the ABCD bamboo bundle veneer type diagram of the present invention;

[0025] Figure 2 This is a schematic diagram of the bamboo bundle veneer paving of the present invention;

[0026] Figure 3 This is a schematic diagram of the cold-pressed arc setting of the present invention;

[0027] Figure 4 This is a schematic diagram of stacking of the present invention;

[0028] Figure 5 It is a schematic diagram of arc paving of the present invention. DETAILED DESCRIPTION

[0029] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Embodiment 1

[0033] See also Figure 1-4 The present invention provides a technical solution: a method for preparing reconstructed bamboo with controllable lateral arc length and arc, comprising the following steps:

[0034] 1) Bamboo strips are treated to remove green and yellow parts, and then soft bamboo bundles are obtained after bamboo strips are treated to remove green and yellow parts;

[0035] 2) Weaving: The bamboo bundles are woven by a weaving machine. During the weaving process, the lateral gaps between the bamboo bundles are controlled. The bamboo bundles can be divided into single boards with tightly arranged bamboo bundles (the gap between the bamboo bundles is 0-1mm, recorded as Class A), single boards with relatively tightly arranged bamboo bundles (the gap between the bamboo bundles is 1-3mm, recorded as Class B), single boards with relatively loosely arranged bamboo bundles (the gap between the bamboo bundles is 3-6mm, recorded as Class C) and single boards with loosely arranged bamboo bundles (the gap between the bamboo bundles is 6-10mm, recorded as Class D). Figure 1 As shown; the length of the bamboo bundle veneer is 2400mm, and the width can be woven according to needs;

[0036] 3) Drying: Dry the A, B, C, and D bamboo bundle veneers to control the moisture content to 10-15%;

[0037] 4) Dipping in glue: The dried bamboo veneer is placed in a glue pool for dipping in glue. The solid content of the glue pool is about 20%, and the glue liquid is a phenolic resin adhesive;

[0038] 5) Drying: Dry the bamboo veneer after dipping, and control the moisture content to 10-15%;

[0039] 6) Gradient paving: The schematic diagram of the gradient paving of bamboo bundle veneer is as shown in the attached Figure 2 As shown in the figure, the bamboo veneer of type A is laid on the bottom layer, and the bamboo veneers from the core layer to the surface layer are of type B, C, and D, showing a gradient distribution from compact to loose. Since the transverse strength of the bamboo veneer is weak, it can be improved by adding tough materials at appropriate positions.

[0040] 7) Hot pressing: placing the gradient paved bamboo bundle veneer in a hot press for hot pressing;

[0041] 8) Cold pressing to form an arc: After the hot pressing is completed, the reconstructed bamboo is placed in an arc-fixing press for cold pressing to form an arc, as shown in the attached Figure 3 As shown in the figure; the lower pressing plate is fixed, and the upper pressing plate applies pressure downward at a rate of 0.2-0.5mm / s, and the direction of the pressure is consistent with the direction of moisture absorption and warping of the reconstructed bamboo; after the upper and lower pressing plates are tightly fitted with the reconstructed bamboo, continue to apply pressure, maintain the pressure at 8-10MPa, and maintain the pressure for 20 minutes; during the pressure maintenance process, cooling water is introduced for cooling treatment;

[0042] 9) Unloading: After the curved reconstructed bamboo drops below 40℃, unload the boards from the cold press and stack them on the curved boards until the moisture content is balanced. The stacking diagram is shown in the attached figure. Figure 4 shown.

[0043] Embodiment 2

[0044] See also Figure 5 The present invention provides a technical solution: a method for preparing reconstructed bamboo with controllable lateral arc length and arc, comprising the following steps:

[0045] 1)-5) Steps are the same as method 1;

[0046] 6) Arc paving: Complete the arc paving of bamboo bundles on the arc bottom plate. The paving diagram is as shown in the attached figure. Figure 5 As shown, the same type of bamboo bundle veneer can be used for paving, or different types of bamboo bundle veneer can be used for paving; toughness material can also be added to increase the lateral strength;

[0047] 7) Hot pressing and cold pressing integrated molding: the bottom plate with bamboo bundle veneer is sent to the arc hot press for hot pressing. After the hot pressing is completed, cooling water is introduced for cold pressing;

[0048] 8) Unloading boards: After the temperature of the curved reconstructed bamboo drops below 40°C, the boards are unloaded and stacked on curved boards to achieve a balanced moisture content.

[0049] Case 1

[0050] Manufacturing process of 6mm small arc reconstructed bamboo Based on the first embodiment, the following steps can be used to manufacture 6mm small arc reconstructed bamboo.

[0051] 1) Bamboo strips are treated to remove green and yellow parts, and then soft bamboo bundles are obtained after bamboo strips are treated to remove green and yellow parts;

[0052] 2) Weaving: Use a weaving machine to weave the bamboo bundles to weave A, B, and C type bamboo bundle veneers.

[0053] 3) Drying: Dry the A, B, C bamboo veneers and poplar veneers to control the moisture content to 10-15%;

[0054] 4) Dipping in glue: placing the dried A, B, C type bamboo veneer and poplar veneer in a glue pool for dipping in glue, the solid content of the glue pool is about 20%, and the glue liquid is a phenolic resin adhesive;

[0055] 5) Drying: Dry the A, B, C bamboo veneers and poplar veneers after dipping, and control the moisture content to 10-15%;

[0056] 6) Gradient paving: 6 layers are used, the first layer is poplar veneer paved in transverse grain, the second to fourth layers are A, B, C type bamboo bundle veneer paved in sequence along the grain, the fifth layer is glass fiber, and the sixth layer is poplar veneer paved in transverse grain.

[0057] 7) Hot pressing: The gradient paving bamboo bundle veneer is placed in a hot press for hot pressing. The hot pressing temperature is 135°C-145°C, the hot pressing time is 1mm / min, the pressure is 19MPa, and the thickness is controlled by a thickness gauge.

[0058] 8) Cold pressing to form an arc: After the hot pressing is completed, the reconstructed bamboo is placed in an arc-fixing press for cold pressing to fix the arc. The lower pressing plate is fixed, and the upper pressing plate applies pressure downward at a rate of 0.5mm / s. The direction of pressure application is opposite to the direction of moisture absorption and warping of the reconstructed bamboo. After the upper and lower pressing plates are tightly attached to the reconstructed bamboo, continue to apply pressure, maintain the pressure at 8-10MPa, and maintain the pressure for 20 minutes. Cooling water is introduced during the pressure-maintaining process for cooling treatment.

[0059] 9) Unloading boards: After the curved reconstructed bamboo is cooled to below 40℃, the boards are unloaded from the cold press and stacked onto curved boards of corresponding curvatures to achieve a balanced moisture content.

[0060] The specific data are shown in the following table:

[0061]

[0062] Case 2

[0063] Manufacturing process of 12 mm small arc reconstructed bamboo. Based on the first embodiment, the following steps can be used to manufacture 12 mm small arc reconstructed bamboo.

[0064] 1) Bamboo strips are treated to remove green and yellow parts, and then soft bamboo bundles are obtained after bamboo strips are treated to remove green and yellow parts;

[0065] 2) Weaving: Use a weaving machine to weave the bamboo bundles to weave A, B, C, and D bamboo bundle veneers.

[0066] 3) Drying: Dry the A, B, C, D bamboo veneers and poplar veneers to control the moisture content to 10-15%;

[0067] 4) Dipping in glue: placing the dried A, B, C, D bamboo veneers and poplar veneers in a glue pool for dipping in glue, the solid content of the glue pool is about 20%, and the glue liquid is a phenolic resin adhesive;

[0068] 5) Drying: Dry the A, B, C, D bamboo veneers and poplar veneers after dipping, and control the moisture content to 10-15%;

[0069] 6) Gradient paving: 14 layers are used for paving. The 1st and 3rd layers are poplar veneer paved with the horizontal grain, the 2nd and 4th layers are poplar veneer paved with the grain, the 5th to 10th layers are A, A, B, B, C, D type bamboo bundle veneer paved with the grain in sequence, and the 11th to 14th layers are the same as the 1st to 4th layers.

[0070] 7) Hot pressing: The gradient paving bamboo bundle veneer is placed in a hot press for hot pressing. The hot pressing temperature is 135°C-145°C, the hot pressing time is 1mm / min, the pressure is 19MPa, and the thickness is controlled by a thickness gauge.

[0071] 8) Cold pressing to form an arc: After the hot pressing is completed, the reconstructed bamboo is placed in an arc-fixing press for cold pressing to form an arc. The lower pressing plate is fixed, and the upper pressing plate applies pressure downward at a rate of 0.2 mm / s. The direction of pressure application is opposite to the direction of moisture absorption and warping of the reconstructed bamboo.

[0072] After close fitting, continue to apply pressure, maintain the pressure at 8-10MPa, and maintain the pressure for 20 minutes. During the pressure maintenance process, cool water is introduced to reduce the temperature.

[0073] 9) Unloading boards: After the curved reconstructed bamboo is cooled to below 40℃, the boards are unloaded from the cold press and stacked onto curved boards of corresponding curvatures to achieve a balanced moisture content.

[0074] The specific data are shown in the following table:

[0075]

[0076] Case 3

[0077] Manufacturing process of 6mm small arc reconstructed bamboo Based on the second embodiment, the following steps can be used to manufacture 6mm small arc reconstructed bamboo.

[0078] 1) Bamboo strips are treated to remove green and yellow parts, and then soft bamboo bundles are obtained after bamboo strips are treated to remove green and yellow parts;

[0079] 2) Weaving: Use a weaving machine to weave the bamboo bundles to weave A, B, C, and D bamboo bundle veneers.

[0080] 3) Drying: Dry the A, B, C, D bamboo veneers and poplar veneers to control the moisture content to 10-15%;

[0081] 4) Dipping in glue: placing the dried A, B, C, D bamboo veneers and poplar veneers in a glue pool for dipping in glue, the solid content of the glue pool is about 20%, and the glue liquid is a phenolic resin adhesive;

[0082] 5) Drying: Dry the A, B, C, D bamboo veneers and poplar veneers after dipping, and control the moisture content to 10-15%;

[0083] 6) Curved paving: Six layers of paving are used on the curved board (radian is 0.6rad). The first layer is poplar veneer paved in the horizontal direction. The second to fifth layers are A, B, C, D type bamboo bundle veneers paved along the grain in sequence. The sixth layer is poplar veneer paved in the horizontal direction.

[0084] 7) Hot pressing and cold pressing integrated molding: The bottom plate with bamboo veneer paved is sent to the arc hot press machine (radian is 0.6rad) for hot pressing. After the hot pressing is completed, cooling water is introduced for cold pressing. The hot pressing temperature is 135℃-145℃, the hot pressing time is 1mm / min, the pressure is 19MPa, and the thickness is controlled by a thickness gauge. The cold pressing pressure is 8MPa and the cold pressing time is 20min.

[0085] 8) Unloading: After the curved reconstructed bamboo board drops below 40℃, it is unloaded and stacked on curved boards of corresponding curvature to achieve equilibrium moisture content.

[0086] The specific data are shown in the following table:

[0087]

[0088] Case 4

[0089] Manufacturing process of 12 mm small arc reconstructed bamboo. Based on the second embodiment, the following steps can be used to manufacture 12 mm small arc reconstructed bamboo.

[0090] 1) Bamboo strips are treated to remove green and yellow parts, and then soft bamboo bundles are obtained after bamboo strips are treated to remove green and yellow parts;

[0091] 2) Weaving: Use a weaving machine to weave the bamboo bundles to weave A, B, C, and D bamboo bundle veneers.

[0092] 3) Drying: Dry the A, B, C, D bamboo veneers and poplar veneers to control the moisture content to 10-15%;

[0093] 4) Dipping in glue: placing the dried A, B, C, D bamboo veneers and poplar veneers in a glue pool for dipping in glue, the solid content of the glue pool is about 20%, and the glue liquid is a phenolic resin adhesive;

[0094] 5) Drying: Dry the A, B, C, D bamboo veneers and poplar veneers after dipping, and control the moisture content to 10-15%;

[0095] 6) Curved paving: 14 layers are used for curved panels (radian is 0.3rad). The 1st and 3rd layers are poplar veneer paved with the horizontal grain, the 2nd and 4th layers are poplar veneer paved with the grain, the 5th to 10th layers are A, A, B, B, C, D type bamboo bundle veneer paved with the grain in sequence, and the 11th to 14th layers are the same as the 1st to 4th layers.

[0096] 7) Hot pressing and cold pressing integrated molding: The bottom plate with bamboo veneer paved is sent to the arc hot press machine (radian is 0.3rad) for hot pressing. After the hot pressing is completed, cooling water is introduced for cold pressing. The hot pressing temperature is 135℃-145℃, the hot pressing time is 1mm / min, the pressure is 19MPa, and the thickness is controlled by a thickness gauge. The cold pressing pressure is 8MPa and the cold pressing time is 20min.

[0097] 8) Unloading boards: After the curved reconstructed bamboo drops below 40°C, the boards are unloaded and stacked on curved boards of corresponding curvatures to achieve a balanced moisture content.

[0098] The specific data are shown in the following table:

[0099]

[0100] Case 5

[0101] Manufacturing process of 6mm large arc reconstructed bamboo Based on the second embodiment, the following steps can be used to manufacture 6mm large arc reconstructed bamboo.

[0102] 1) Bamboo strips are treated to remove green and yellow parts, and then soft bamboo bundles are obtained after bamboo strips are treated to remove green and yellow parts;

[0103] 2) Weaving: Use a weaving machine to weave the bamboo bundles to weave A, B, and D type bamboo bundle veneers.

[0104] 3) Drying: Dry the A, B, D bamboo veneers and poplar veneers to control the moisture content to 10-15%;

[0105] 4) Dipping in glue: placing the dried A, B, D type bamboo veneer and poplar veneer in a glue pool for dipping in glue, the solid content of the glue pool is about 20%, and the glue liquid is a phenolic resin adhesive;

[0106] 5) Drying: Dry the A, B, D bamboo veneers and poplar veneers after dipping, and control the moisture content to 10-15%;

[0107] 6) Arc paving: 7 layers of paving are used on the arc board (radian is 1.0rad). The first layer is poplar veneer paved with the horizontal grain, the second layer is poplar veneer paved with the grain, the third to fifth layers are A, B, C, D type bamboo bundle veneer paved with the grain in sequence, and the sixth and seventh layers are consistent with the first and second layers.

[0108] 7) Hot pressing and cold pressing integrated molding: The bottom plate with bamboo veneer paved is sent to the arc hot press machine (arc is 1.0rad) for hot pressing. After the hot pressing is completed, cooling water is introduced for cold pressing. The hot pressing temperature is 135℃-145℃, the hot pressing time is 1mm / min, the pressure is 19MPa, and the thickness is controlled by a thickness gauge. The cold pressing pressure is 8MPa and the cold pressing time is 20min.

[0109] 8) Unloading boards: After the curved reconstructed bamboo drops below 40°C, the boards are unloaded and stacked on curved boards of corresponding curvatures to achieve a balanced moisture content.

[0110] The specific data are shown in the following table:

[0111]

[0112] Case 6

[0113] Manufacturing process of 12 mm large arc reconstructed bamboo. Based on the second embodiment, the following steps can be used to manufacture 12 mm large arc reconstructed bamboo.

[0114] 1) Bamboo strips are treated to remove green and yellow parts, and then soft bamboo bundles are obtained after bamboo strips are treated to remove green and yellow parts;

[0115] 2) Weaving: Use a weaving machine to weave the bamboo bundles to weave A, B, and D type bamboo bundle veneers.

[0116] 3) Drying: Dry the A, B, D bamboo veneers and poplar veneers to control the moisture content to 10-15%;

[0117] 4) Dipping in glue: placing the dried A, B, D type bamboo veneer and poplar veneer in a glue pool for dipping in glue, the solid content of the glue pool is about 20%, and the glue liquid is a phenolic resin adhesive;

[0118] 5) Drying: Dry the A, B, D bamboo veneers and poplar veneers after dipping, and control the moisture content to 10-15%;

[0119] 6) Arc paving: 14 layers are used on the arc board (radian is 1.0rad). The 1st, 3rd and 5th layers are poplar veneer paved with the horizontal grain, the 2nd and 4th layers are poplar veneer paved with the grain, the 6th to 9th layers are A, B, C, D type bamboo bundle veneer paved with the grain in sequence, and the 10th to 14th layers are the same as the 1st to 5th layers.

[0120] 7) Hot pressing and cold pressing integrated molding: The bottom plate with bamboo veneer paved is sent to the arc hot press machine (arc is 1.0rad) for hot pressing. After the hot pressing is completed, cooling water is introduced for cold pressing. The hot pressing temperature is 135℃-145℃, the hot pressing time is 1mm / min, the pressure is 19MPa, and the thickness is controlled by a thickness gauge. The cold pressing pressure is 8MPa and the cold pressing time is 20min.

[0121] 8) Unloading boards: After the curved reconstructed bamboo drops below 40°C, the boards are unloaded and stacked on curved boards of corresponding curvatures to achieve a balanced moisture content.

[0122] The specific data are shown in the following table:

[0123]

[0124] Case 7

[0125] Manufacturing process of 6mm large arc ultra-long arc reconstructed bamboo. Based on the second embodiment, the following steps can be used to manufacture 6mm large arc ultra-long arc reconstructed bamboo.

[0126] 1) Bamboo strips are treated to remove green and yellow parts, and then soft bamboo bundles are obtained after bamboo strips are treated to remove green and yellow parts;

[0127] 2) Weaving: Use a weaving machine to weave the bamboo bundles to weave A, B, and D type bamboo bundle veneers, and the size of the bamboo bundle veneer is 1200mm×2400mm (length×width).

[0128] 3) Drying: Dry the A, B, D bamboo veneers and poplar veneers to control the moisture content to 10-15%;

[0129] 4) Dipping in glue: placing the dried A, B, D type bamboo veneer and poplar veneer in a glue pool for dipping in glue, the solid content of the glue pool is about 20%, and the glue liquid is a phenolic resin adhesive;

[0130] 5) Drying: Dry the A, B, D bamboo veneers and poplar veneers after dipping, and control the moisture content to 10-15%;

[0131] 6) Arc paving: 8 layers are used on the arc board (radian is 1.0rad). The first layer is poplar veneer paved with the horizontal grain, the second layer is poplar veneer paved with the grain, the third layer is glass fiber, the 4th to 6th layers are A, B, C type bamboo bundle veneer paved with the grain in sequence, and the 7th and 8th layers are consistent with the 1st and 2nd layers.

[0132] 7) Hot pressing and cold pressing integrated molding: The bottom plate with bamboo veneer paved is sent to the arc hot press machine (arc is 1.0rad) for hot pressing. After the hot pressing is completed, cooling water is introduced for cold pressing. The hot pressing temperature is 135℃-145℃, the hot pressing time is 1mm / min, the pressure is 19MPa, and the thickness is controlled by a thickness gauge. The cold pressing pressure is 8MPa and the cold pressing time is 20min.

[0133] 8) Unloading boards: After the curved reconstructed bamboo drops below 40°C, the boards are unloaded and stacked on curved boards of corresponding curvatures to achieve a balanced moisture content.

[0134] The specific data are shown in the following table:

[0135]

[0136] In summary, the reconstructed bamboo produced based on the method described in the present invention is an integrally formed arc-shaped reconstructed bamboo material. The arc-shaped reconstructed bamboo can be customized according to demand with an arc range of 0-1rad. Compared with the arc-shaped boards spliced ​​together, it has better integrity and strength.

[0137] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing reconstructed bamboo with controllable transverse arc length and curvature, characterized in that: The following steps are involved: 1) Bamboo strips are treated to remove green and yellow parts, and then soft bamboo bundles are obtained after bamboo strips are treated to remove green and yellow parts; 2) Weaving: The bamboo bundles are woven by a weaving machine. During the weaving process, the lateral gaps of the bamboo bundles are controlled. The bamboo bundles can be divided into tightly arranged bamboo bundles veneers, which are recorded as Class A, relatively tightly arranged bamboo bundles veneers, which are recorded as Class B, relatively loosely arranged bamboo bundles veneers, which are recorded as Class C, and loosely arranged bamboo bundles veneers, which are recorded as Class D. The length of the bamboo bundle veneer is 2400 mm, and the width can be woven according to the needs; 3) Drying: Dry the A, B, C, and D bamboo bundle veneers to control the moisture content to 10-15%; 4) Dipping in glue: The dried bamboo veneer is placed in a glue pool for dipping in glue. The solid content of the glue pool is about 20%, and the glue liquid is a phenolic resin adhesive; 5) Drying: Dry the bamboo veneer after dipping, and control the moisture content to 10-15%; 6) Gradient paving: The specific method of gradient paving of bamboo bundle veneer is that the A-type bamboo bundle veneer is placed at the bottom layer, and the core layer to the surface layer of bamboo bundle veneer are B, C, and D types in sequence, showing a gradient distribution from compact to loose; Since the transverse strength of bamboo bundle veneer is weak, it can be improved by adding toughness material at appropriate positions; 7) Hot pressing: placing the gradient paved bamboo bundle veneer in a hot press for hot pressing; 8) Cold pressing to form an arc: After the hot pressing is completed, the reconstructed bamboo is placed in an arc-fixing press for cold pressing and arc-fixing; the lower pressing plate is fixed, and the upper pressing plate applies pressure downward at a rate of 0.2-0.5 mm / s, and the direction of the pressure is consistent with the direction of moisture absorption and warping of the reconstructed bamboo; after the upper and lower pressing plates are tightly attached to the reconstructed bamboo, continue to apply pressure, maintain the pressure at 8-10 MPa, and maintain the pressure for 20 minutes; during the pressure-maintaining process, cool water is introduced for cooling treatment; 9) Unloading boards: After the curved reconstructed bamboo is cooled to below 40℃, the boards are unloaded from the cold press and stacked on curved boards to achieve a balanced moisture content.

2. The method for preparing a reconstructed bamboo with controllable transverse arc length and arc according to claim 1, characterized in that: The gap between the bamboo bundles of the closely arranged bamboo bundle veneer is 0-1 mm.

3. The method for preparing a reconstructed bamboo with controllable transverse arc length and arc according to claim 1, characterized in that: The gap between the bamboo bundles of the relatively closely arranged bamboo bundle veneer is 1-3 mm.

4. The method for preparing a reconstructed bamboo with controllable transverse arc length and arc according to claim 1, characterized in that: The gap between the bamboo bundles of the relatively loosely arranged bamboo bundle veneer is 3-6 mm.

5. The method for preparing reconstructed bamboo with controllable transverse arc length and arc according to claim 1, characterized in that: The gap between the bamboo bundles of the loosely arranged bamboo bundle veneer is 6-10 mm.

6. The recombinant bamboo obtained by the method for preparing recombinant bamboo with controllable transverse arc length and curvature according to any one of claims 1 to 5, wherein the curvature range of the recombinant bamboo is 0-1 rad.

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