Reconstituted bamboo board and method for manufacturing reconstituted bamboo board

Abstract

The application discloses a kind of reconstituted bamboo boards and the manufacturing method of reconstituted bamboo board.The reconstituted bamboo board according to the application is configured to be hot-pressed by two or more bamboo bundle layers stacked along the thickness direction of itself, wherein each bamboo bundle layer includes two bamboo bundle parts arranged along the length direction, and the bamboo bundle part is formed by a plurality of bamboo bundles impregnated with glue arranged in a single layer along the width direction.The two bamboo bundle parts are connected by a connecting part.The connecting part contains bamboo fibers and adhesive.The reconstituted bamboo board and the manufacturing method of reconstituted bamboo board according to the application connect the two bamboo bundle parts by using the connecting part containing bamboo fibers and adhesive, which eliminates defects such as cavities and unevenness at the connecting part (extension position), making the structure of the connecting part (extension position) dense and the appearance beautiful.Compared with directly using long bamboo bundles, the use of short bamboo bundles through the connecting part improves the utilization rate of bamboo, reduces costs and does not reduce the strength of the reconstituted bamboo board.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of reconstituted bamboo production, and particularly relates to a reconstituted bamboo board and a manufacturing method thereof. BACKGROUND

[0002] The reconstituted bamboo board has strong durability and is not easily affected by factors such as insect damage and decay, and can be used not only for structural components such as columns, beams and veranda frames, but also for ground and wall decoration. With the increasing awareness of environmental protection and sustainable development, the market prospect of the reconstituted bamboo board is becoming wider and wider. The length of the reconstituted bamboo board on the market is mostly 1860 mm, and a small amount can reach 3000 mm. The reconstituted bamboo board with a length of about 3000 mm is mostly formed by tenoning the 1860 mm long board, which will reduce the strength of the tenon joint and increase the production process and production cost. The disadvantage of using a 3000 mm long bamboo bundle to press the reconstituted bamboo board is that the utilization rate of bamboo is reduced due to the too long bamboo chips for processing the bamboo bundle, which will increase the production cost. If the reconstituted bamboo board with a length of about 3000 mm is formed by lengthening the bamboo bundle with a short size, the existing lengthening method is usually the conventional butt joint, lap joint or oblique joint, and defects such as voids and unevenness often occur at the connection part (lengthening position).

[0003] Therefore, the present application provides a reconstituted bamboo board and a manufacturing method thereof to at least partially solve the above problems. SUMMARY

[0004] A series of simplified concepts are introduced in the summary section, which will be further described in detail in the detailed description section. The summary section of the present application does not mean to attempt to limit the key features and essential technical features of the claimed technical solution, nor to determine the protection scope of the claimed technical solution.

[0005] In order to at least partially solve the above problems, the first aspect of the present application provides a reconstituted bamboo board, which is configured to be formed by hot pressing two or more bamboo bundle layers stacked along the thickness direction of the board, wherein each bamboo bundle layer comprises two bamboo bundle parts arranged along the length direction, and the bamboo bundle part is formed by a plurality of bamboo bundles impregnated with glue arranged in a single layer along the width direction.

[0006] The two bamboo bundle parts are connected by a connecting part, and the connecting part comprises bamboo fibers and adhesive.

[0007] The reconstituted bamboo board according to the present application eliminates defects such as cavities and unevenness of the connecting part (lengthening position) by lengthening two bamboo bundle parts through a connecting part containing bamboo fibers and an adhesive, so that the connecting part (lengthening position) is dense in structure and has an attractive appearance. Compared with the method of lengthening short bamboo bundles through a connecting part, the use of long bamboo bundles directly improves the utilization rate of bamboo and reduces costs without reducing the strength of the reconstituted bamboo board.

[0008] Optionally, the diameter of the bamboo fiber is smaller than the size of the glued bamboo bundle in the width direction.

[0009] Optionally,

[0010] The size of two bamboo bundle parts in one bamboo bundle layer in the length direction is different; and / or

[0011] The sum of the sizes of two bamboo bundle parts in one bamboo bundle layer in the length direction is greater than 3000mm.

[0012] Optionally, two connecting parts of adjacent two bamboo bundle layers are arranged in a staggered manner in the length direction.

[0013] Optionally, the glued bamboo bundle includes a first glued bamboo bundle, one end of the first glued bamboo bundle is configured as a flossing part, the flossing part includes continuous bamboo fibers in a dispersed state, a plurality of first glued bamboo bundles are arranged in a single layer in the width direction to form a first bamboo bundle part, the flossing parts in two first bamboo bundle parts are overlapped to form the connecting part, so that two first bamboo bundle parts form a first bamboo bundle layer.

[0014] Optionally, at least two first bamboo bundle layers are arranged in a stacked manner in the thickness direction and are hot-pressed to form the reconstituted bamboo board.

[0015] Optionally, the glued bamboo bundle includes a second glued bamboo bundle, a plurality of second glued bamboo bundles are arranged in a single layer in the width direction to form a second bamboo bundle part, two second bamboo bundle parts are arranged in a spaced manner in the length direction, and a connecting part is arranged between the two second bamboo bundle parts, so that two second bamboo bundle parts and the connecting part form a second bamboo bundle layer, and the connecting part includes a bamboo fiber filler and an adhesive.

[0016] Optionally,

[0017] At least two second bamboo bundle layers are arranged in a stacked manner in the thickness direction and are hot-pressed to form the reconstituted bamboo board; and / or

[0018] The size of the flossing part in the length direction is 20-40mm.

[0019] Optionally,

[0020] The impregnated bamboo bundle includes a second impregnated bamboo bundle, a plurality of the second impregnated bamboo bundles are arranged in a single layer along the width direction to form a second bamboo bundle part, two second bamboo bundle parts are arranged at intervals along the length direction, and a connecting part is arranged between the two second bamboo bundle parts, so that the two second bamboo bundle parts and the connecting part form a second bamboo bundle layer, and the connecting part includes bamboo fiber filler and adhesive;

[0021] The first bamboo bundle layer and the second bamboo bundle layer are alternately arranged along the thickness direction and hot-pressed to form the reconstituted bamboo board.

[0022] Optionally, the bamboo fiber filler of the connecting part is bamboo powder and / or fiber silk generated during preparation of the impregnated bamboo bundle.

[0023] The second aspect of the present application provides a manufacturing method of a reconstituted bamboo board, for preparing a reconstituted bamboo board, the manufacturing method of the reconstituted bamboo board comprising:

[0024] A bamboo piece defibrating step of defibrating bamboo pieces into bamboo bundles of a predetermined size;

[0025] A carbonization and drying step of carbonizing the bamboo bundles through a steam carbonization process and then drying;

[0026] An impregnation step of impregnating the bamboo bundles after carbonization and drying with adhesive;

[0027] An adhesive drying step of drying the carbonized bamboo bundles impregnated with adhesive to obtain impregnated bamboo bundles;

[0028] A bamboo bundle layer board arranging step of arranging the impregnated bamboo bundles in a single layer along the width direction to form a bamboo bundle part, and arranging two bamboo bundle parts along the length direction and connecting them into a bamboo bundle layer through a connecting part, wherein the connecting part contains bamboo fiber and adhesive;

[0029] A board blank pressing step of stacking and arranging at least two bamboo bundle layers along the thickness direction and hot-pressing to form the reconstituted bamboo board.

[0030] According to the manufacturing method of the reconstituted bamboo board of the present application, the impregnated bamboo bundles are arranged to form a bamboo bundle part, and two bamboo bundle parts are connected through a connecting part containing bamboo fiber and adhesive, which eliminates defects such as cavities and unevenness of the connecting part, makes the structure of the connecting part (connection position) dense, improves the appearance, improves the utilization rate of bamboo, reduces the cost and does not reduce the strength of the reconstituted bamboo board.

[0031] Optionally, the diameter of the bamboo fiber is smaller than the size of the impregnated bamboo bundle along the width direction.

[0032] Optionally,

[0033] The size of the two bamboo bundle parts in one bamboo bundle layer along the length direction is different; and / or

[0034] The sum of the sizes of two of the bamboo bundle portions in one of the bamboo bundle layers along the length direction is greater than 3000 mm.

[0035] Optionally, the bamboo bundle layer arranging step further comprises: staggered arrangement of the two connecting portions of two adjacent bamboo bundle layers along the length direction.

[0036] Optionally,

[0037] The carbonization drying step and the bamboo piece disintegration step further comprise a splitting step of splitting one end of the bamboo bundle of the predetermined size to form a split portion of dispersed continuous bamboo fibers.

[0038] The split bamboo bundle after the splitting step is subjected to the glue dipping step and the adhesive drying step to form a first glued bamboo bundle.

[0039] The bamboo bundle layer arranging step further comprises: arranging the first glued bamboo bundle in a single layer along the width direction to form a first bamboo bundle portion, and connecting two first bamboo bundle portions through the connecting portion to form a first bamboo bundle layer, wherein the split portions of the two first bamboo bundle portions overlap to form the connecting portion.

[0040] Optionally,

[0041] The bamboo bundle layer arranging step further comprises: arranging the first glued bamboo bundle in a single layer along the width direction to form a first bamboo bundle portion, and connecting two first bamboo bundle portions through the connecting portion to form a first bamboo bundle layer, wherein the split portions of the two first bamboo bundle portions overlap to form the connecting portion.

[0042] The size of the split portion in the splitting step along the length direction is 20-40 mm.

[0043] Optionally,

[0044] The bamboo bundle of the predetermined size is sequentially subjected to the carbonization drying step, the glue dipping step, and the adhesive drying step to form a second glued bamboo bundle.

[0045] The bamboo bundle layer arranging step further comprises: arranging the second glued bamboo bundle in a single layer along the width direction to form a second bamboo bundle portion, and connecting two second bamboo bundle portions through the connecting portion to form a second bamboo bundle layer, wherein the connecting portion is filled with bamboo fiber filler and adhesive between the two second bamboo bundle portions.

[0046] Optionally, the bamboo bundle layer arranging step further comprises: arranging the second glued bamboo bundle in a single layer along the width direction to form a second bamboo bundle portion, and connecting two second bamboo bundle portions through the connecting portion to form a second bamboo bundle layer, wherein the connecting portion is filled with bamboo fiber filler and adhesive between the two second bamboo bundle portions.

[0047] Optionally,

[0048] The bamboo bundle of the predetermined size is sequentially subjected to the carbonization drying step, the glue dipping step and the glue drying step to form a second bamboo bundle of the glue dipping;

[0049] The bamboo bundle layer arranging step further comprises: arranging the second bamboo bundle in a single layer along the width direction to form a second bamboo bundle part, and connecting two second bamboo bundle parts through the connecting part to form a second bamboo bundle layer, wherein the connecting part is filled with bamboo fiber filler and glue.

[0050] The plate blank pressing step further comprises: alternately arranging the first bamboo bundle layer and the second bamboo bundle layer along the thickness direction and hot pressing to form the reconstituted bamboo board.

[0051] Optionally, the bamboo fiber filler of the connecting part is bamboo powder and / or fiber silk generated in at least one of the bamboo chip defibrating step, the carbonization drying step and the glue drying step.

[0052] Optionally, the method further comprises, before the bamboo chip defibrating step:

[0053] The cutting step: cutting the bamboo to obtain bamboo tubes of a predetermined length; and

[0054] The flaking step: flaking the bamboo tubes to obtain bamboo chips of a predetermined width.

[0055] Optionally,

[0056] In the carbonization drying step, the pressure of the carbonization steam is 0.25-0.35 MPa, the carbonization time is 60-180 minutes, the drying temperature is 60-100℃, and the end point of drying is that the water content is reduced to less than or equal to 10%;

[0057] In the glue dipping step, the glue dipping time is 10-30 minutes;

[0058] In the glue drying step, the drying temperature is 50-70℃, and the end point of drying is that the water content is 8%-15%;

[0059] In the plate blank pressing step, the pressing pressure is 21-26 MPa, the pressure holding temperature is 135-145℃, and the pressure holding time is 30-60 minutes. BRIEF DESCRIPTION OF DRAWINGS

[0060] The following drawings of the present application are hereby incorporated into this application as part of the present application for the purpose of understanding the present application. The embodiments of the present application and the description thereof shown in the drawings are used to explain the principles of the present application.

[0061] In the drawings:

[0062] Figure 1A perspective view of a first bamboo bundle layer in a reconstituted bamboo board according to a preferred embodiment of the present application;

[0063] Figure 2 A perspective view of a second bamboo bundle layer in a reconstituted bamboo board according to another preferred embodiment of the present application; and

[0064] Figure 3 A laminated structure of the first bamboo bundle layer and the second bamboo bundle layer in a reconstituted bamboo board according to yet another preferred embodiment of the present application.

[0065] BRIEF DESCRIPTION OF DRAWINGS

[0066] 111: connecting portion

[0067] 112: first bamboo bundle layer

[0068] 113: first bamboo bundle portion

[0069] 114: second bamboo bundle layer

[0070] 115: second bamboo bundle portion DETAILED DESCRIPTION

[0071] In the following description, numerous specific details are given to provide a thorough understanding of the application. However, it will be apparent that the application can be practiced without one or more of the specific details. In other instances, well-known structures are not described in order not to obscure the related aspects of the application.

[0072] For the purposes of this application, the term "bamboo" is used to refer to a plant of the genus Bambusa, Dendrocalamus, Dendrocalamopsis, Melocanna, and Semiarundinaria. For a complete understanding of the present application, reference is made to the following detailed description taken in conjunction with the accompanying drawings.

[0073] It is to be understood that the terms used herein are merely descriptive, but are not intended to restrict the present application. The singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be understood that the terms "comprise" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. The terms "upper," "lower," "front," "rear," "left," "right," and similar terms are used for explanation only and not limiting purposes.

[0074] The ordinal numbers such as "first" and "second" cited in the present invention are merely identifiers and do not have any other meaning, such as a specific order, etc. Moreover, for example, the term "first component" does not imply, by itself, the existence of a "second component", and the term "second component" does not imply, by itself, the existence of a "first component".

[0075] Hereinafter, a specific embodiment of the present invention will be described in more detail with reference to the accompanying drawings, which show a representative embodiment of the present invention and are not intended to limit the present invention.

[0076] Reference Figures 1-3 A reconstituted bamboo board according to the first aspect of the present invention is shown.

[0077] Reference Figure 1 The reconstituted bamboo board is configured to be hot-pressed from two or more bamboo bundle layers stacked along a thickness direction thereof, wherein each bamboo bundle layer comprises two bamboo bundle portions arranged along a length direction, and each bamboo bundle portion is formed by a single layer of a plurality of impregnated bamboo bundles arranged along a width direction. The two bamboo bundle portions are connected by a connecting portion 111 containing bamboo fibers and an adhesive.

[0078] According to the reconstituted bamboo board of the present invention, by using the connecting portion 111 containing bamboo fibers and an adhesive to connect the two bamboo bundle portions, the defects such as cavities and unevenness at the connecting portion (the lengthening position) are eliminated, so that the connecting portion (the lengthening position) has a dense structure and an attractive appearance. Compared with the use of long bamboo bundles, the use of short bamboo bundles lengthened by the connecting portion improves the utilization rate of bamboo and reduces the cost without reducing the strength of the reconstituted bamboo board.

[0079] It should be noted that the "width direction" is the arrangement direction of the impregnated bamboo bundles, the "length direction" is the length direction of the bamboo bundles in the bamboo bundle portion, which is consistent with the length direction of the bamboo and the length direction of the bamboo chips. The "thickness direction" is the thickness direction of the reconstituted bamboo board, i.e., the stacking direction of the bamboo bundle layers. The "width direction" is perpendicular to the "length direction" and the "thickness direction".

[0080] The number of stacked layers of the bamboo bundle layers is related to the thickness of the reconstituted bamboo board required, which can be adjusted according to actual needs.

[0081] Optionally, the diameter of the bamboo fibers is smaller than the size of the impregnated bamboo bundles along the width direction. The diameter of the bamboo fibers is smaller, so that the structure of the connecting portion 111 (the lengthening position) is more dense, the appearance is attractive, and the strength is large.

[0082] Preferably, the two connecting portions 111 of the two adjacent bamboo bundle layers are arranged in a staggered manner along the length direction.

[0083] The lengths of the two bamboo bundles in one bamboo bundle layer can be different. The sum of the lengths of the two bamboo bundles in one bamboo bundle layer along the length direction can be greater than 3000 mm, thereby meeting the market demand for reconstituted bamboo boards with a length of about 3000 mm. For example, the length of the long bamboo bundle is 1930 mm, the length of the short bamboo bundle is 1230 mm, the long bamboo bundle and the short bamboo bundle in the two adjacent bamboo bundle layers in the thickness direction are arranged in opposite directions along the length direction, specifically, for example, the first bamboo bundle layer uses the long bamboo bundle at the end close to the butt of the blank, and uses the short bamboo bundle at the end close to the non-butt of the blank, then the second bamboo bundle layer adjacent to the first bamboo layer uses the short bamboo bundle at the end close to the butt of the blank, and uses the long bamboo bundle at the end close to the non-butt of the blank, the long bamboo bundle and the short bamboo bundle in the third bamboo bundle layer are arranged in the same way as the first bamboo bundle layer, the long bamboo bundle and the short bamboo bundle in the fourth bamboo bundle layer are arranged in the same way as the second bamboo bundle layer, and so on. In this way, two specifications of bamboo bundles can be conveniently used to realize the staggered arrangement of the two connecting parts 111 of the two adjacent bamboo bundle layers along the length direction.

[0084] In some embodiments, the lengths of the two bamboo bundles in one bamboo bundle layer can be the same. At this time, the lengths of the two bamboo bundles in its adjacent bamboo bundle layer can be different, thereby realizing the staggered arrangement of the two connecting parts 111 in the two adjacent bamboo bundle layers along the length direction.

[0085] With reference to Figure 1 , the impregnated bamboo bundle can include a first impregnated bamboo bundle, one end of the first impregnated bamboo bundle is configured as a flocked portion, the flocked portion includes continuous bamboo fibers in a dispersed state, a plurality of first impregnated bamboo bundles are arranged in a single layer along the width direction to form a first bamboo bundle 113, and the flocked portions in the two first bamboo bundles 113 are overlapped to form a connecting part 111, so that the two first bamboo bundles 113 form a first bamboo bundle layer 112. Specifically, the connecting part 111 includes two parts, which are the respective flocked portions in the two first bamboo bundles 113, and the continuous bamboo fibers in the dispersed state in the two different first bamboo bundles 113 are overlapped with each other, thereby being lengthened in the manner that the respective flocked portions in the two first bamboo bundles 113 are overlapped, the connecting part 111 has a dense structure, stable connection, high strength, less adhesive, and is environmentally friendly. The lengths of the two first bamboo bundles 113 in the same bamboo bundle layer can be the same or different. Preferably, the length of the flocked portion along the length direction is 20-40 mm, and the flocked portions in the two first bamboo bundles 113 can be completely overlapped along the length direction, and the connecting part 111 formed at this time can have a length of 20-40 mm along the length direction.

[0086] It can be understood that in some embodiments not shown, three or more first impregnated bamboo bundles need to be connected in the length direction, the first impregnated bamboo bundle in the middle can be configured as a whisked portion at both ends. Alternatively, at least two first bamboo bundle layers 112 are arranged in a stacked manner in the thickness direction and are hot-pressed to form a reconstituted bamboo board. In this way, the lengthening is carried out in a lap joint manner, the formed reconstituted bamboo board is connected stably, has great strength, an attractive appearance, less adhesive, and is environmentally friendly.

[0087] Reference Figure 2 In some embodiments, the impregnated bamboo bundle can include a second impregnated bamboo bundle, a plurality of second impregnated bamboo bundles are arranged in a single layer in the width direction to form a second bamboo bundle part 115, two second bamboo bundle parts 115 are arranged in the length direction, and a connecting part 111 is arranged between the two second bamboo bundle parts 115, so that the two second bamboo bundle parts 115 and the connecting part 111 form a second bamboo bundle layer 114, and the connecting part 111 includes a bamboo fiber filler and an adhesive. Specifically, the two second bamboo bundle parts 115 are butt-jointed, and the gap between the two butt-jointed ends is filled with a bamboo fiber filler and an adhesive to obtain the connecting part 111. In this way, the two second bamboo bundle parts 115 are lengthened in a butt-jointed manner, the connecting part 111 has a dense structure, is connected stably, has great strength, can utilize waste bamboo fibers, saves materials, and reduces waste.

[0088] The connecting part 111 formed by butt-jointing the two second bamboo bundle parts 115 and filling the gap between the two butt-jointed ends with a bamboo fiber filler and an adhesive can have a length of 0-20 mm in the length direction. Alternatively, at least two second bamboo bundle layers 114 are arranged in a stacked manner in the thickness direction and are hot-pressed to form a reconstituted bamboo board. In this way, the lengthening is carried out in a butt-jointed manner, the formed reconstituted bamboo board is connected stably, has great strength, an attractive appearance, saves materials, and reduces waste.

[0089] Reference Figure 3 In some embodiments, the impregnated bamboo bundle includes a second impregnated bamboo bundle, a plurality of second impregnated bamboo bundles are arranged in a single layer in the width direction to form a second bamboo bundle part 115, two second bamboo bundle parts 115 are arranged in the length direction, and a connecting part 111 is arranged between the two second bamboo bundle parts 115, so that the two second bamboo bundle parts 115 and the connecting part 111 form a second bamboo bundle layer 114, and the connecting part 111 includes a bamboo fiber filler and an adhesive. The first bamboo bundle layer 112 and the second bamboo bundle layer 114 are arranged in an alternating manner in the thickness direction and are hot-pressed to form a reconstituted bamboo board. In other words, the connecting methods of lap jointing and butt-jointing are used simultaneously, in the two adjacent bamboo bundle layers, one is a bamboo bundle layer formed by lap jointing two first bamboo bundle parts 113, and the other is a bamboo bundle layer formed by butt-jointing two second bamboo bundle parts 115, which can combine the advantages of the two connecting methods and provide a new technical solution and technical concept for the reconstituted bamboo board.

[0090] Optionally, the bamboo fiber filler of the connecting part 111 can be bamboo powder and / or fiber filaments generated during the preparation of the second impregnated bamboo bundle. In this way, the bamboo fiber waste, i.e. bamboo powder and / or fiber filaments, generated during the manufacturing process of the reconstituted bamboo board is directly utilized as the bamboo fiber filler of the connecting part 111 of the bamboo bundle layer produced in the butt joint manner, which cooperates with the adhesive to form the connecting part 111 of the bamboo bundle layer connected in the butt joint manner. Of course, if necessary and / or desired, the bamboo fiber filler of the connecting part 111 can be bamboo powder and / or fiber filaments generated during the preparation of the first impregnated bamboo bundle, or other required bamboo powder and / or fiber filaments generated during other production processes.

[0091] The second aspect of the present application provides a manufacturing method of a reconstituted bamboo board for preparing a reconstituted bamboo board. The manufacturing method of the reconstituted bamboo board comprises:

[0092] A bamboo strip defibrating step of defibrating the bamboo strips into bamboo bundles of a predetermined size;

[0093] A carbonization and drying step of carbonizing the bamboo bundles through a steam carbonization process and then drying the carbonized bamboo bundles;

[0094] An impregnation step of impregnating the carbonized and dried bamboo bundles with an adhesive;

[0095] An adhesive drying step of drying the carbonized bamboo bundles impregnated with the adhesive to obtain impregnated bamboo bundles;

[0096] A bamboo bundle layer panelizing step of arranging the impregnated bamboo bundles in a single layer along the width direction to form bamboo bundle parts, and arranging two bamboo bundle parts along the length direction and connecting them into a bamboo bundle layer through connecting parts 111, wherein the connecting parts 111 comprise bamboo fibers and adhesive;

[0097] A board blank pressing step of arranging and hot pressing at least two bamboo bundle layers in a stacked arrangement along the thickness direction to form a reconstituted bamboo board.

[0098] The manufacturing method of the reconstituted bamboo board according to the present application arranges the impregnated bamboo bundles to form bamboo bundle parts, and connects two bamboo bundle parts by using connecting parts comprising bamboo fibers and adhesive, thereby eliminating defects such as cavities and unevenness of the connecting parts, making the connecting parts (connection positions) structurally dense and aesthetically pleasing. Compared with directly using long bamboo bundles, the method of connecting short bamboo bundles through connecting parts improves the utilization rate of bamboo, reduces costs, and does not reduce the strength of the reconstituted bamboo board.

[0099] The reconstituted bamboo board manufactured by the manufacturing method of the reconstituted bamboo board according to the present application comprises all the features and effects of the reconstituted bamboo board according to the present application.

[0100] The following three specific embodiments are exemplarily given to help understand the present application.

[0101] First Embodiment

[0102] Reference Figure 1 The manufacturing method of the reconstituted bamboo board can comprise:

[0103] A cutting step of cutting the bamboo culms to obtain bamboo culms of a predetermined length, for example, the predetermined length can be 1230-1930mm;

[0104] A slicing step of slicing the bamboo culms to obtain bamboo slices of a predetermined width, for example, the predetermined width can be 20-40mm;

[0105] A defibration step of defibrating the bamboo slices into bamboo bundles of a predetermined size, for example, the predetermined size can be 1-4mm in diameter;

[0106] A carbonization and drying step of carbonizing the bamboo bundles through a steam carbonization process and then drying, wherein the pressure of the carbonization steam is 0.25-0.35MPa, the carbonization time is 60-180 minutes, the drying temperature is 60-100℃, and the end point of the drying is that the water content is reduced to less than or equal to 10%;

[0107] A glue dipping step of dipping the carbonized and dried bamboo bundles in a glue, wherein the glue can be a phenolic resin glue, the glue dipping time can be 10-30 minutes, and the specific gravity of the glue can be 1.085-1.1;

[0108] A glue drying step of drying the carbonized bamboo bundles dipped in the glue to obtain glue-dipped bamboo bundles, wherein the drying temperature is 50-70℃, and the end point of the drying is that the water content is 8%-15%;

[0109] A bamboo bundle layer arranging step of arranging the glue-dipped bamboo bundles in a single layer along the width direction to form bamboo bundle parts, and arranging two bamboo bundle parts along the length direction and connecting them into a bamboo bundle layer through connecting parts 111, wherein the connecting parts 111 contain bamboo fibers and glue;

[0110] A board blank pressing step of arranging at least two bamboo bundle layers in a laminated arrangement along the thickness direction and hot pressing to form a reconstituted bamboo board, wherein the pressing pressure is 21-26MPa, the holding pressure temperature is 135-145℃, and the holding pressure time is 30-60 minutes.

[0111] In the first embodiment, there is also a whisking step between the carbonization and drying step and the bamboo slice defibration step, which whisks and thins one end of the bamboo bundle of the predetermined size, so that the whisked part forms continuous bamboo fibers in a dispersed state. The whisked bamboo bundle is subjected to the glue dipping step and the glue drying step to form a first glue-dipped bamboo bundle. The bamboo bundle layer arranging step further comprises arranging the first glue-dipped bamboo bundle in a single layer along the width direction to form a first bamboo bundle part 113, and connecting two first bamboo bundle parts 113 into a first bamboo bundle layer 112 through connecting parts 111, wherein the whisked parts in the two first bamboo bundle parts 113 overlap to form the connecting parts 111.

[0112] Preferably, the size of the frayed portion along the length direction is 20-40 mm, the frayed portions in the two first bamboo bundle portions 113 can be completely overlapped along the length direction, and the size of the formed connecting portion 111 along the length direction can be 20-40 mm.

[0113] It can be understood that in some unshown embodiments, in the case of needing to connect three or more first impregnated bamboo bundles along the length direction, the first impregnated bamboo bundle in the middle can be pressed thin at both ends to form the frayed portions in a dispersed state.

[0114] The blank pressing step specifically includes: stacking and hot-pressing at least two first bamboo bundle layers 112 along the thickness direction to form a reconstituted bamboo board. In this way, the lengthening is performed in an overlapping manner, the formed reconstituted bamboo board is stable in connection, high in strength, and beautiful in appearance, and the material is saved and the waste is reduced.

[0115] The fraying process makes the disintegrated bamboo bundle into continuous bamboo fibers in a dispersed state, and the diameter of the continuous bamboo fibers formed by fraying is generally smaller than that of the disintegrated bamboo bundle. The connecting portion 111 includes two parts, i.e., the respective frayed portions in the two first bamboo bundle portions 113, and the dispersed state continuous bamboo fibers in the two different first bamboo bundle portions 113 are overlapped with each other, thereby lengthening in the overlapping manner of the respective frayed portions in the two first bamboo bundle portions 113, eliminating defects such as cavities and unevenness at the connecting portion 111 (lengthening position), and the connecting portion 111 is dense in structure, stable in connection, high in strength, low in adhesive consumption, and environmentally friendly.

[0116] The bamboo bundle layer arranging step and the bamboo mat pressing step more specifically include: manufacturing a first bamboo bundle layer 112 of a first layer, using a first bamboo bundle part 113 (a long bamboo bundle part, for example, 1930 mm in length) subjected to a shaving and thinning treatment near the end of the bamboo mat at the head, using a first bamboo bundle part 113 (a short bamboo bundle part, for example, 1230 mm in length) subjected to a shaving and thinning treatment at the end of the bamboo mat away from the head, and connecting the two first bamboo bundle parts 113 in a length direction by overlapping the shaved parts of the two first bamboo bundle parts 113 to form a connecting part 111, the length of the overlapping of the two first bamboo bundle parts 113 being, for example, 20-40 mm, in other words, the connecting part 111 of the first layer can have a length of 20-40 mm in the length direction. Manufacturing a first bamboo bundle layer 112 of a second layer, using a first bamboo bundle part 113 (a short bamboo bundle part, for example, 1230 mm in length) subjected to a shaving and thinning treatment near the end of the bamboo mat at the head, using a first bamboo bundle part 113 (a long bamboo bundle part, for example, 1930 mm in length) subjected to a shaving and thinning treatment at the end of the bamboo mat away from the head, and connecting the two first bamboo bundle parts 113 in a length direction by overlapping the shaved parts of the two first bamboo bundle parts 113 to form a connecting part 111, the length of the overlapping of the two first bamboo bundle parts 113 being, for example, 20-40 mm, in other words, the connecting part 111 of the second layer can have a length of 20-40 mm in the length direction. Alternately arranging the first bamboo bundle layer 112 of the first layer and the first bamboo bundle layer 112 of the second layer in a thickness direction and hot-pressing to form a bamboo board. The number of layers of the first bamboo bundle layer 112 can be an odd number or an even number, and the actual total number of layers can be adjusted according to actual requirements (for example, the volume and density requirements of the bamboo mat).

[0117] The diameter of the bamboo fiber can be smaller than the size of the bamboo bundle in the width direction. The diameter of the bamboo fiber is small, and thus the connecting part 111 (the lengthening position) has a dense structure, an attractive appearance, and high strength.

[0118] Preferably, the bamboo bundle layer arranging step can further include: arranging the two connecting parts 111 of the two adjacent first bamboo bundle layers 112 in a length direction in a staggered manner.

[0119] In the first embodiment, the two first bamboo bundle parts 113 in the same bamboo bundle layer can have different sizes in the length direction. The sum of the sizes of the two bamboo bundle parts in the same bamboo bundle layer in the length direction can be greater than 3000 mm, thereby meeting the market demand for the reconstituted bamboo board with a length of about 3000 mm. For example, the length of the long bamboo bundle part is 1930 mm, and the length of the short bamboo bundle part is 1230 mm. The long bamboo bundle part and the short bamboo bundle part in the two adjacent bamboo bundle layers in the thickness direction are arranged in opposite ways in the length direction. Specifically, for example, the first bamboo bundle layer uses the long bamboo bundle part near the head end of the blank and uses the short bamboo bundle part near the non-head end of the blank. The second bamboo bundle layer adjacent to the first bamboo bundle layer uses the short bamboo bundle part near the head end of the blank and uses the long bamboo bundle part near the non-head end of the blank. The long bamboo bundle part and the short bamboo bundle part in the third bamboo bundle layer are arranged in the same way as in the first bamboo bundle layer. The long bamboo bundle part and the short bamboo bundle part in the fourth bamboo bundle layer are arranged in the same way as in the second bamboo bundle layer. This is repeated. In this way, two specifications of bamboo bundle parts can be conveniently used to arrange the two connecting parts 111 of the two adjacent bamboo bundle layers in the length direction.

[0120] Alternatively, the lengths of the two first bamboo bundle parts 113 in one bamboo bundle layer can be the same. At this time, the lengths of the two first bamboo bundle parts 113 in the adjacent bamboo bundle layer can be different, thereby achieving the arrangement of the two connecting parts 111 in the two adjacent first bamboo bundle layers 112 in the length direction.

[0121] Second embodiment

[0122] Reference Figure 2 In the second embodiment, the difference from the first embodiment is that there is no carbonization drying step between the carbonization drying step and the bamboo chip disintegration step.

[0123] The bamboo bundle with a predetermined size is sequentially subjected to the carbonization drying step, the glue dipping step, and the adhesive drying step to form a second dipped bamboo bundle. The bamboo bundle layer arrangement step further includes arranging the second dipped bamboo bundle in a single layer in the width direction to form a second bamboo bundle part 115 and connecting two second bamboo bundle parts 115 into a second bamboo bundle layer 114 through a connecting part 111, wherein the connecting part 111 is formed by filling the bamboo fiber filler and the adhesive between the two second bamboo bundle parts 115. The blank pressing step can further include arranging at least two second bamboo bundle layers 114 in the thickness direction and hot pressing to form a reconstituted bamboo board. Specifically, the two second bamboo bundle parts 115 are butt jointed, and the gap between the two butt jointed ends is filled with the bamboo fiber filler and the adhesive to obtain the connecting part 111. In this way, the two second bamboo bundle parts 115 are connected in this butt jointed manner, and the defects such as the hollow, unevenness, etc. of the connecting part 111 (the connected position) are eliminated. The connecting part 111 has a dense structure, stable connection, and high strength. The waste bamboo fiber can be used to save materials and reduce waste.

[0124] Two second bamboo bundle parts 115 are butted together, the gap between the two butted ends is filled with bamboo fiber filler and adhesive, and the connecting part 111 formed along the length direction can have a size of 0-20 mm.

[0125] At least two second bamboo bundle layers 114 are arranged in a stacking manner along the thickness direction and are hot-pressed to form a reconstituted bamboo board. In this way, the lengthening is performed in a butted manner, the reconstituted bamboo board formed is stable in connection, has great strength, an attractive appearance, saves materials, and reduces waste. The hot-pressing can be hot-pressing or high-frequency heating hot-pressing.

[0126] The bamboo bundle layer arranging step and the board blank pressing step more specifically include: manufacturing a first layer of second bamboo bundle layers 114, using normally defibrated second bamboo bundle parts 115 (long bamboo bundle parts, for example, 1930 mm in length) near the head end of the board blank, using normally defibrated second bamboo bundle parts 115 (short bamboo bundle parts, for example, 1230 mm in length) at the non-head end of the board blank, the two lengths of second bamboo bundle parts 115 are lengthened in a butted manner, the gap between the two butted ends can have a size of 0-20 mm in the length direction, in other words, the connecting part 111 of the first layer can have a size of 0-20 mm in the length direction. Manufacturing a second layer of second bamboo bundle layers 114, using normally defibrated second bamboo bundle parts 115 (short bamboo bundle parts, for example, 1230 mm in length) near the head end of the board blank, using normally defibrated second bamboo bundle parts 115 (long bamboo bundle parts, for example, 1930 mm in length) at the non-head end of the board blank, the two lengths of second bamboo bundle parts 115 are lengthened in a butted manner, the gap between the two butted ends of the two lengths of second bamboo bundle parts 115 can have a size of 0-20 mm in the length direction, in other words, the connecting part 111 of the second layer can have a size of 0-20 mm in the length direction. The first layer of second bamboo bundle layers 114 and the second layer of second bamboo bundle layers 114 are arranged in an alternating manner along the thickness direction and are hot-pressed to form a reconstituted bamboo board. The number of layers of second bamboo bundle layers 114 can be an odd number of layers or an even number of layers, and the actual total number of layers can be adjusted according to actual requirements (for example, the volume and density requirements of the board blank).

[0127] Optionally, the bamboo fiber filler of the connecting portion 111 can be bamboo powder and / or fiber filaments generated during the preparation of the second impregnated bamboo bundle, for example, can be bamboo powder and / or fiber filaments generated in at least one of a bamboo sheet defibrating step, a carbonization drying step, and a glue drying step. Thus, the bamboo bundle layer produced in a butt joint manner directly utilizes bamboo fiber waste, i.e., bamboo powder and / or fiber filaments, generated during the manufacturing process of the reconstituted bamboo board, as the bamboo fiber filler of the connecting portion 111, which cooperates with the glue to form the connecting portion 111 of the bamboo bundle layer connected in a butt joint manner. Of course, if necessary and / or desired, the bamboo fiber filler of the connecting portion 111 can also be other required bamboo powder and / or fiber filaments generated during production.

[0128] The remaining unexplained parts in the second embodiment refer to the description in the first embodiment and the drawings, and for the sake of brevity will not be described and / or illustrated in detail.

[0129] Third embodiment

[0130] Reference Figure 3 In the third embodiment, unlike the first embodiment, the bamboo bundle of the predetermined size is sequentially subjected to a carbonization drying step, an impregnation step, and a glue drying step to form a second impregnated bamboo bundle. The bamboo bundle layer arranging step further includes arranging the second impregnated bamboo bundle in a single layer along the width direction to form a second bamboo bundle portion 115, and connecting two second bamboo bundle portions 115 into a second bamboo bundle layer 114 through a connecting portion 111, wherein the connecting portion 111 is filled with bamboo fiber filler and glue between the two second bamboo bundle portions 115. The board blank pressing step further includes alternately arranging the first bamboo bundle layer 112 and the second bamboo bundle layer 114 along the thickness direction and hot pressing to form a reconstituted bamboo board.

[0131] The bamboo bundle layer arranging step and the bamboo bundle pressing step more specifically include: manufacturing the second bamboo bundle layer 114 of the first layer, using the second bamboo bundle part 115 (long bamboo bundle part, for example, 1930mm in length) of normal defibration without fluffing and thinning treatment near the one end of the bamboo bundle body close to the head, using the second bamboo bundle part 115 (short bamboo bundle part, for example, 1230mm in length) of normal defibration without fluffing and thinning treatment at the other end of the bamboo bundle body far from the head, and connecting the two kinds of second bamboo bundle parts 115 in a butt joint manner, and filling the gap between the two butt joint ends with bamboo fiber filler and adhesive to obtain the connecting part 111. The gap between the two butt joint ends of the two kinds of second bamboo bundle parts 115 in the length direction can be, for example, 0-20mm, in other words, the connecting part 111 of the first layer in the length direction can be 0-20mm. Manufacturing the first bamboo bundle layer 112 of the second layer, using the first bamboo bundle part 113 (short bamboo bundle part, for example, 1230mm in length) of fluffing and thinning treatment near the one end of the bamboo bundle body close to the head, using the first bamboo bundle part 113 (long bamboo bundle part, for example, 1930mm in length) of fluffing and thinning treatment at the other end of the bamboo bundle body far from the head, and connecting the two kinds of first bamboo bundle parts 113 in an overlapping manner, wherein the fluffed parts of the two first bamboo bundle parts 113 are overlapped to form the connecting part 111, and the length of the overlapping of the two kinds of bamboo bundles is, for example, 20-40mm, in other words, the connecting part 111 of the second layer in the length direction can be 20-40mm. Arranging the second bamboo bundle layer 114 of the first layer and the first bamboo bundle layer 112 of the second layer alternately in the thickness direction and hot-pressing to form the reconstituted bamboo board. The total number of bamboo bundle layers in the reconstituted bamboo board can be an odd number or an even number, and the actual total number can be adjusted according to actual needs (for example, the volume and density requirements of the bamboo bundle body).

[0132] The structure of the second bamboo bundle layer 114 of the first layer and the structure of the first bamboo bundle layer 112 of the second layer can be alternated.

[0133] The third embodiment simultaneously uses the connecting methods of overlapping and butt joint, one of the two adjacent bamboo bundle layers is the first bamboo bundle layer 112 formed by overlapping two first bamboo bundle parts 113, and the other is the second bamboo bundle layer 114 formed by butt joining two second bamboo bundle parts 115, which can comprehensively utilize the advantages of the two connecting methods and provide a new technical solution and technical concept for the reconstituted bamboo board.

[0134] Optionally, the bamboo fiber filler of the connecting portion 111 can be bamboo powder and / or fiber filaments generated during the preparation of the first impregnated bamboo bundle and / or the second impregnated bamboo bundle, for example, can be bamboo powder and / or fiber filaments generated in at least one of the bamboo sheet defibrillation step, the carbonization drying step, and the adhesive drying step. Thus, the bamboo bundle layer produced in the butt joint manner directly utilizes the bamboo fiber waste, i.e., bamboo powder and / or fiber filaments, generated during the manufacturing process of the reconstituted bamboo board as the bamboo fiber filler of the connecting portion 111, which cooperates with the adhesive to form the connecting portion 111 of the bamboo bundle layer extended in the butt joint manner. Of course, if necessary and / or desired, the bamboo fiber filler of the connecting portion 111 can also be other required bamboo powder and / or fiber filaments generated during production.

[0135] The remaining unexplained parts in the third embodiment refer to the description in the first embodiment and the drawings, and for the sake of brevity will not be described and / or illustrated in detail.

[0136] Unless otherwise defined, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", or "includes" and / or "including" when used herein, specify the presence of stated features, integers, steps, operations, elements, and / or components but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. As used herein, the term "about" when used in reference to a particular recited numerical value, means that the value can vary from the recited value by no more than 1%, 2%, 5%, or 10%. As used herein, the term "consisting essentially of" means that the composition can include additional components that do not materially affect the essential characteristics of the composition. As used herein, the term "consisting of means that the composition includes only the recited components.

[0137] The present application has been described through the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and illustration, and are not intended to limit the present application to the described embodiments. Furthermore, those skilled in the art can understand that the present application is not limited to the above embodiments, and more various modifications and changes can be made according to the teachings of the present application, which all fall within the scope of the present application claimed. The scope of protection of the present application is defined by the attached claims and their equivalent scope.

Claims

1. A reconstituted bamboo board, characterized in that, The reconstituted bamboo board is formed by hot pressing two or more layers of bamboo bundles stacked along its own thickness direction. Each layer of the bamboo bundle includes two bamboo bundles arranged along the length direction. The bamboo bundles are formed by multiple resin-impregnated bamboo bundles arranged in a single layer along the width direction. The two bamboo bundles are connected by a connecting part, which includes bamboo fibers and adhesive, wherein the diameter of the bamboo fibers is smaller than the dimension of the glue-impregnated bamboo bundle along the width direction; The resin-impregnated bamboo bundle includes a first resin-impregnated bamboo bundle, one end of which is constructed as a broom-like portion. The broom-like portion includes continuous bamboo fibers in a dispersed state. Multiple first resin-impregnated bamboo bundles are arranged in a single layer along the width direction to form a first bamboo bundle section. The broom-like portions of two first bamboo bundle sections arranged along the length direction overlap to form the connecting portion, so that the two first bamboo bundle sections form a first bamboo bundle layer. The resin-impregnated bamboo bundles include second resin-impregnated bamboo bundles. Multiple second resin-impregnated bamboo bundles are arranged in a single layer along the width direction to form a second bamboo bundle section. Two second bamboo bundle sections are arranged at intervals along the length direction, and a connecting part is provided between the two second bamboo bundle sections. The two second bamboo bundle sections are joined together so that the two second bamboo bundle sections and the connecting part form a second bamboo bundle layer. The connecting part includes bamboo fiber filler and adhesive. The bamboo fiber filler of the connecting part is bamboo fiber waste generated during the manufacturing process of the reconstituted bamboo board.

2. The reconstituted bamboo board according to claim 1, characterized in that, The two bamboo bundle portions in one of the bamboo bundle layers have different dimensions along the length direction; and / or The sum of the dimensions of the two bamboo bundle portions in one of the bamboo bundle layers along the length direction is greater than 3000 mm.

3. The reconstituted bamboo board according to claim 2, characterized in that, The two connecting portions of two adjacent bamboo bundle layers are staggered along the length direction.

4. The reconstituted bamboo board according to claim 1, characterized in that, The broom-like portion has a length dimension of 20-40 mm.

5. The reconstituted bamboo board according to claim 1, characterized in that, The first bamboo bundle layer and the second bamboo bundle layer are alternately arranged along the thickness direction and hot-pressed to form the reconstituted bamboo board.

6. A method for manufacturing reconstituted bamboo board, used to prepare the reconstituted bamboo board according to any one of claims 1 to 5, characterized in that, The manufacturing method of the reconstituted bamboo board includes: The bamboo strip splitting step involves splitting the bamboo strips into bundles of predetermined size; The carbonization and drying step involves carbonizing the bamboo bundles through a steam carbonization process and then drying them. The impregnation step involves impregnating the carbonized and dried bamboo bundles with an adhesive. The adhesive drying step involves drying the carbonized bamboo bundles impregnated with the adhesive to obtain the adhesive-impregnated bamboo bundles. In the bamboo bundle layering step, the resin-impregnated bamboo bundles are arranged in a single layer along the width direction to form a bamboo bundle section, and two bamboo bundle sections are arranged along the length direction and connected by a connecting part to form a bamboo bundle layer, wherein the connecting part contains bamboo fiber and adhesive. The second resin-impregnated bamboo bundles are arranged in a single layer along the width direction to form a second bamboo bundle section, and two second bamboo bundle sections are connected by the connecting part to form a second bamboo bundle layer, wherein bamboo fiber filler and adhesive are filled between the two second bamboo bundle sections to form the connecting part. In the board pressing step, the first bamboo bundle layer and the second bamboo bundle layer are alternately arranged along the thickness direction and hot-pressed to form the reconstituted bamboo board; The carbonization and drying step and the bamboo strip thinning step are further divided into a broom-forming step, in which one end of the bamboo bundle of the predetermined size is broom-forming and thinned so that the broom-forming part forms a continuous bamboo fiber in a dispersed state; the broom-forming bamboo bundle is then subjected to the impregnation step and the adhesive drying step to form a first impregnated bamboo bundle. The bamboo bundles of the predetermined size are sequentially subjected to the carbonization and drying step, the resin impregnation step, and the adhesive drying step to form a second resin-impregnated bamboo bundle; The bamboo bundle layering step further includes: arranging the first resin-impregnated bamboo bundles in a single layer along the width direction to form a first bamboo bundle section, and connecting two first bamboo bundle sections through the connecting part to form a first bamboo bundle layer, wherein the broom-like portions of the two first bamboo bundle sections overlap to form the connecting part. The second impregnated bamboo bundles are arranged in a single layer along the width direction to form a second bamboo bundle section, and two second bamboo bundle sections are connected by the connecting part to form a second bamboo bundle layer. The connecting part is formed by filling the space between the two second bamboo bundle sections with bamboo fiber filler and adhesive. The bamboo fiber filler in the connecting part is bamboo fiber waste generated during the manufacturing process of the reconstituted bamboo board.

7. The method for manufacturing reconstituted bamboo boards according to claim 6, characterized in that, The bamboo fiber filler in the connecting part of the second bamboo bundle layer is bamboo powder and / or fiber filaments produced in at least one of the bamboo strip disintegration step, the carbonization and drying step, and the adhesive drying step.

8. The method for manufacturing reconstituted bamboo board according to claim 6, characterized in that, The process also includes the following steps before the bamboo strip thinning step: Cutting steps: Cut the bamboo into sections to obtain bamboo tubes of the desired length; and The bamboo tube is split open to obtain bamboo strips of a predetermined width.

9. The method for manufacturing reconstituted bamboo boards according to claim 6, characterized in that, In the carbonization and drying step, the pressure of the carbonization steam is 0.25-0.35 MPa, the carbonization time is 60-180 minutes, the drying temperature is 60-100℃, and the drying endpoint is when the moisture content drops to less than or equal to 10%. In the impregnation step, the impregnation time is 10-30 minutes; In the adhesive drying step, the drying temperature is 50-70℃, and the drying endpoint is when the moisture content is between 8% and 15%. In the slab pressing step, the pressing pressure is 21-26 MPa, the holding temperature is 135-145℃, and the holding time is 30-60 minutes.

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