Preparation method of bamboo-wood composite board capable of efficiently utilizing bamboos

Abstract

The invention belongs to the technical field of preparation of artificial boards, and particularly relates to a preparation method of a bamboo-wood composite board capable of efficiently utilizing bamboos. In order to solve the problem that a bamboo-wood composite board manufacturing method capable of improving the utilization rate of bamboo wood and improving the mechanical property of a product does not exist in the prior art, the invention provides a bamboo-wood composite board manufacturing method capable of efficiently utilizing the bamboo wood, which comprises the following steps: removing bamboo poles from the bamboo wood and cutting off to obtain the bamboo wood to be planed; planing to obtain bamboo slices; drying, dipping in glue, and drying for the second time to obtain glue-containing bamboo sheets; a surface layer and a bottom layer of the bamboo-wood composite board are formed by multiple layers of wood veneers, a middle layer located between the surface layer and the bottom layer is obtained by paving and assembling the glue-containing bamboo sheets obtained in the third step, and a board blank is obtained through pre-pressing; and performing hot pressing on the plate blank to obtain the bamboo-wood composite plate. The preparation method provided by the invention can be used for processing bamboo materials with different ages and medium and small diameters, does not need to remove bamboo green and tabasheer, can realize full-rod utilization, and reduces the production cost.

Description

Technical Field

[0001] The invention belongs to the technical field of artificial board preparation, and in particular relates to a method for preparing a bamboo-wood composite board with efficient utilization of bamboo materials. Background Art

[0002] At present, most bamboo materials used in the manufacture of artificial boards have the following processing methods, such as radial bamboo, chordal bamboo, rolled bamboo and bamboo chips. These different forms and processing methods play an important role in the manufacture and application of artificial boards. However, due to the poor wettability and mutual bonding properties of bamboo green and bamboo yellow, bamboo green and bamboo yellow need to be removed when processing and using bamboo, which will increase processing time and labor costs, and also reduce the comprehensive utilization rate of bamboo.

[0003] For example, in the Chinese invention patent application CN201610610423.4, a method for preparing high-performance bamboo plywood records "step (1) taking materials, selecting suitable bamboo strips, and removing the green and yellow bamboo", which clearly states that the green and yellow bamboo strips need to be removed in advance during processing. In the Chinese invention patent application CN201210206307.8, a new type of all-bamboo plywood, its manufacturing method also requires the removal of green and yellow bamboo strips. Chinese invention patent CN202210949467.5, a bamboo-fir composite oriented structural particle board and its manufacturing method, records that "the bamboo is radially peeled into bamboo shavings by changing the peeling method of bamboo shavings, and the bamboo-wood composite oriented particle board is prepared after modification to replace the bamboo curtain wood veneer assembly structural core material, ultimately improving production efficiency and reducing labor intensity. However, in the production steps, it is necessary to manually color sort the bamboo green skin, remove the bamboo green skin, and screen out unqualified bamboo shavings." It also states that the bamboo green needs to be removed in advance during processing.

[0004] There are also products in the current industry that can utilize green and yellow bamboo. For example, radial bamboo strips are made by decomposing bamboo stalks into long bamboo strips along the longitudinal diameter of the bamboo material, with green and yellow bamboo located on both sides. Although the step of removing green and yellow bamboo is omitted, the wall thickness of the bamboo material is converted into the width of the bamboo strips, making it impossible to utilize small and medium diameter bamboo, and the manufacturing cost is relatively high.

[0005] In the invention patent with application number CN201110123893.5, entitled "A method for producing bamboo particleboard with uniform density", bamboo chips with a moisture content of 10-15% and a particle size of less than 0.9 cm are used as raw materials to make bamboo particleboard. This method solves the problem of uneven density of bamboo particleboard by using finely divided materials, thereby producing bamboo particleboard with uniform density and improving the utilization rate of bamboo and the flatness of the board surface. However, since the materials used are too finely divided, the bamboo particleboard produced by this method can only be used as non-load-bearing materials such as furniture and requires more adhesives.

[0006] In summary, the prior art cannot satisfy the need for a method for manufacturing a bamboo-wood composite board that can both improve the utilization rate of bamboo materials and improve the mechanical properties of the product. Summary of the invention

[0007] The purpose of the present invention is to solve the above problems and provide a method for preparing a bamboo-wood composite board with efficient utilization of bamboo materials.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A method for preparing a bamboo-wood composite board with efficient bamboo utilization comprises the following steps:

[0010] Step 1: Remove bamboo branches from the bamboo and cut it into pieces to obtain bamboo to be planed;

[0011] Step 2: using a planer to plan the bamboo material to be planed obtained in step 1 along the end surface direction of the bamboo material to obtain a bamboo slice in a ring or arc shape;

[0012] Step 3: drying the bamboo slices obtained in step 2 and then dipping them in glue, and then drying them again after dipping them in glue to obtain glue-containing bamboo slices;

[0013] Step 4: Use multiple layers of wood veneer to form the surface layer and bottom layer of the bamboo-wood composite board, and the middle layer between the surface layer and the bottom layer is the glue-containing bamboo sheet prepared in step 3, which is pre-pressed after paving and assembling to obtain a slab;

[0014] Step 5: hot-press the slab to obtain a bamboo-wood composite board.

[0015] In the above-mentioned method for preparing a bamboo-wood composite board with efficient utilization of bamboo, in the step 2, the planing angle of the planer for planing the bamboo to be planed is 60-85 degrees, and the planing angle is the angle of the wedge-shaped planer itself (i.e. Figure 1 The angle β in the planer and the angle between the inner side of the planer and the bamboo surface (i.e. Figure 1 The sum of the angles α).

[0016] In the above-mentioned method for preparing a bamboo-wood composite board with efficient utilization of bamboo materials, the planing angle of the bamboo material to be planed by the planer is 65 degrees.

[0017] In the above-mentioned method for preparing a bamboo-wood composite board with efficient utilization of bamboo materials, the planing angle of the bamboo material to be planed by the planer is 80 degrees.

[0018] In the above-mentioned method for preparing a bamboo-wood composite board with efficient utilization of bamboo materials, the thickness of the bamboo slices prepared in step 2 is 0.5-1.5 mm.

[0019] In the above-mentioned method for preparing a bamboo-wood composite board with efficient utilization of bamboo materials, the amount of the dipping glue in step 3 is 7-15% of the total weight of the bamboo slices after drying.

[0020] In the above-mentioned method for preparing a bamboo-wood composite board with efficient utilization of bamboo materials, the moisture content of the glue-containing bamboo slices obtained after secondary drying in step three is 6-12%.

[0021] In the above-mentioned method for preparing a bamboo-wood composite board with efficient utilization of bamboo materials, the surface layer and the bottom layer in step four are symmetrically composed of 2-5 layers of wood veneers; or the surface layer is composed of woven bamboo mats and 1-4 layers of wood veneers, and the bottom layer is composed of 2-5 layers of wood veneers.

[0022] In the above-mentioned method for preparing a bamboo-wood composite board with efficient utilization of bamboo materials, in step 4, the thickness of the surface layer and the bottom layer is 5-10 mm, the thickness of the middle layer is 5-45 mm, and the total thickness is 10-55 mm.

[0023] In the above-mentioned method for preparing a bamboo-wood composite board with efficient utilization of bamboo materials, the hot pressing temperature in step five is 130-150° C., the hot pressing pressure is 2.5-5.0 MPa, and the hot pressing time is 1.0-1.2 min / mm of the total thickness.

[0024] Compared with the prior art, the advantages of the present invention are:

[0025] 1. The preparation method provided by the present invention is not picky about the bamboo age, and can process and use bamboo of medium and small diameter grades. It is not necessary to remove green bamboo and yellow bamboo, and the whole bamboo can be utilized, thus reducing the production cost.

[0026] 2. The bamboo thin slice obtained by planing along the end face direction of the bamboo material of the present invention has bamboo flesh in the middle, and bamboo yellow and bamboo green are located on the inner and outer sides of the bamboo thin slice, thereby avoiding the problem of poor wettability of bamboo green and bamboo yellow of the bamboo material itself and poor mutual gluing performance. The gluing interface of the middle layer of the bamboo-wood composite board is the bamboo flesh surface with bamboo fiber ducts, which has high hardness and strong ability of bamboo fiber ducts to impregnate and absorb glue, thus forming glue nails that are easy to glue and have high strength. The bamboo-wood composite board manufactured using the bamboo thin slice has high mechanical strength index and good gluing performance.

[0027] 3. The present invention finds that by adjusting the planing angle during planing, the width of the bamboo slices can be made different, and the final bamboo-wood composite board exhibits different bonding strengths, and provides a planing angle selection range for producing a bamboo-wood composite board with stronger bonding strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the planing process of the present invention;

[0029] Figure 2 It is a schematic diagram of the structure of the annular bamboo slice;

[0030] Figure 3 It is a schematic diagram of the structure of an arc-shaped bamboo sheet;

[0031] In the figure: bamboo material to be planed 1, planer 2, annular bamboo slices 3, arc-shaped bamboo slices 4, yellow bamboo side 5, green bamboo side 6, bamboo flesh 7, and bamboo fiber duct 8. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0033] Example 1

[0034] This embodiment provides a method for preparing a bamboo-wood composite board with high efficiency of bamboo material utilization. Figure 1-3 As shown, the following steps are included:

[0035] Step 1: Remove bamboo branches from the bamboo and cut it into pieces to obtain bamboo material 1 to be planed;

[0036] Step 2: Plane the bamboo material to be planed in step 1 along the end surface of the bamboo material using a planer 2, with a planing angle of 85 degrees, to obtain a bamboo sheet in the shape of a ring or arc, with a thickness of 1.2-1.5 mm. Figure 2 As shown, the arc-shaped bamboo sheet 4 is as shown in Figure 3 As shown, the inner side is the yellow bamboo side 5, the outer side is the green bamboo side 6, and the middle is the bamboo flesh 7 with bamboo fiber ducts 8;

[0037] Step 3: drying the bamboo slices obtained in step 2 and then dipping them in glue, wherein the dipping amount is 15% of the total weight of the dried bamboo slices, and then performing secondary drying after dipping to obtain glue-containing bamboo slices, wherein the moisture content of the glue-containing bamboo slices is 12%;

[0038] Step 4: Use multiple layers of wood veneer to form the surface layer and bottom layer of the bamboo-wood composite board. The middle layer between the surface layer and the bottom layer is the glue-containing bamboo sheet prepared in step 3. After paving and assembling, pre-pressing is performed to obtain a slab, wherein the thickness of the surface layer and the bottom layer is 10 mm, the thickness of the middle layer is 45 mm, and the total thickness is 55 mm;

[0039] Step 5: hot pressing the slab to obtain a bamboo-wood composite board, the hot pressing temperature is 150° C., the hot pressing pressure is 5.0 MPa, and the hot pressing time is 66 min.

[0040] Example 2

[0041] This embodiment provides a method for preparing a bamboo-wood composite board with high efficiency of bamboo material utilization. Figure 1-3 As shown, the following steps are included:

[0042] Step 1: Remove bamboo branches from the bamboo and cut it into pieces to obtain bamboo material 1 to be planed;

[0043] Step 2: Plane the bamboo material to be planed in step 1 along the end surface of the bamboo material using a planer 2, with a planing angle of 60 degrees, to obtain a bamboo sheet in the shape of a ring or arc, with a thickness of 0.5-0.8 mm. Figure 2 As shown, the arc-shaped bamboo sheet 4 is as shown in Figure 3 As shown, the inner side is the yellow bamboo side 5, the outer side is the green bamboo side 6, and the middle is the bamboo flesh 7 with bamboo fiber ducts 8;

[0044] Step 3: drying the bamboo slices obtained in step 2 and then dipping them in glue, wherein the dipping amount is 7% of the total weight of the dried bamboo slices, and then performing secondary drying after dipping to obtain glue-containing bamboo slices, wherein the moisture content of the glue-containing bamboo slices is 6%;

[0045] Step 4: Use multiple layers of wood veneers to form the surface layer and bottom layer of the bamboo-wood composite board. The middle layer between the surface layer and the bottom layer is the glue-containing bamboo sheet prepared in step 3. After paving and assembly, pre-pressing is performed to obtain a slab. The surface layer and the bottom layer are symmetrically formed of two layers of wood veneers. The thickness of the surface layer and the bottom layer is 5 mm, the thickness of the middle layer is 5 mm, and the total thickness is 10 mm.

[0046] Step 5: hot pressing the slab to obtain a bamboo-wood composite board, the hot pressing temperature is 130° C., the hot pressing pressure is 2.5 MPa, and the hot pressing time is 10 min.

[0047] Example 3

[0048] This embodiment provides a method for preparing a bamboo-wood composite board with high efficiency of bamboo material utilization. Figure 1-3 As shown, the following steps are included:

[0049] Step 1: Remove bamboo branches from the bamboo and cut it into pieces to obtain bamboo material 1 to be planed;

[0050] Step 2: Plane the bamboo material to be planed in step 1 along the end surface of the bamboo material using a planer 2, with a planing angle of 80 degrees, to obtain a bamboo sheet in the shape of a ring or arc, with a thickness of 0.8-1.0 mm. Figure 2 As shown, the arc-shaped bamboo sheet 4 is as shown in Figure 3 As shown, the inner side is the yellow bamboo side 5, the outer side is the green bamboo side 6, and the middle is the bamboo flesh 7 with bamboo fiber ducts 8;

[0051] Step 3: drying the bamboo slices obtained in step 2 and then dipping them in glue, wherein the dipping amount is 10% of the total weight of the dried bamboo slices, and then performing secondary drying after dipping to obtain glue-containing bamboo slices, wherein the moisture content of the glue-containing bamboo slices is 10%;

[0052] Step 4: Use multiple layers of wood veneer to form the surface layer and bottom layer of the bamboo-wood composite board. The middle layer between the surface layer and the bottom layer is the glue-containing bamboo sheet prepared in step 3. After paving and assembly, pre-pressing is performed to obtain a slab, wherein the surface layer is composed of woven bamboo mats and 4 layers of wood veneer, and the bottom layer is composed of 5 layers of wood veneer. The thickness of the surface layer and the bottom layer is 10 mm, the thickness of the middle layer is 15 mm, and the total thickness is 25 mm.

[0053] Step 5: hot pressing the slab to obtain a bamboo-wood composite board, the hot pressing temperature is 140° C., the hot pressing pressure is 3.8 MPa, and the hot pressing time is 27.5 min.

[0054] Example 4

[0055] This embodiment provides a method for preparing a bamboo-wood composite board with high efficiency of bamboo material utilization. Figure 1-3 As shown, the following steps are included:

[0056] Step 1: Remove bamboo branches from the bamboo and cut it into pieces to obtain bamboo material 1 to be planed;

[0057] Step 2: Plane the bamboo material to be planed in step 1 along the end surface of the bamboo material using a planer 2, with a planing angle of 65 degrees, to obtain a bamboo sheet in the shape of a ring or arc, with a thickness of 0.8-1.0 mm. Figure 2 As shown, the arc-shaped bamboo sheet 4 is as shown in Figure 3 As shown, the inner side is the yellow bamboo side 5, the outer side is the green bamboo side 6, and the middle is the bamboo flesh 7 with bamboo fiber ducts 8;

[0058] Step 3: drying the bamboo slices obtained in step 2 and then dipping them in glue, wherein the dipping amount is 10% of the total weight of the dried bamboo slices, and then performing secondary drying after dipping to obtain glue-containing bamboo slices, wherein the moisture content of the glue-containing bamboo slices is 10%;

[0059] Step 4: Use multiple layers of wood veneers to form the surface layer and bottom layer of the bamboo-wood composite board. The middle layer between the surface layer and the bottom layer is the glue-containing bamboo sheet prepared in step 3. After paving and assembly, the slab is pre-pressed. The surface layer and the bottom layer are symmetrically composed of 3 layers of wood veneers. The thickness of the surface layer and the bottom layer is 6 mm, the thickness of the middle layer is 36 mm, and the total thickness is 42 mm.

[0060] Step 5: hot pressing the slab to obtain a bamboo-wood composite board, the hot pressing temperature is 140° C., the hot pressing pressure is 3.8 MPa, and the hot pressing time is 46.2 min.

[0061] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0062] Although the terms such as bamboo material to be planed 1, planer 2, annular bamboo slice 3, arc-shaped bamboo slice 4, yellow side of bamboo 5, green side of bamboo 6, bamboo flesh 7, bamboo fiber conduit 8 are used more frequently in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A method for preparing a bamboo-wood composite board with efficient utilization of bamboo materials, characterized in that: The following steps are involved: Step 1: Remove bamboo branches from the bamboo and cut it into pieces to obtain bamboo to be planed; Step 2: using a planer to plan the bamboo material to be planed obtained in step 1 along the end surface direction of the bamboo material to obtain a bamboo slice in a ring or arc shape; Step 3: drying the bamboo slices obtained in step 2 and then dipping them in glue, and then drying them again after dipping them in glue to obtain glue-containing bamboo slices; Step 4: Use multiple layers of wood veneer to form the surface layer and bottom layer of the bamboo-wood composite board, and the middle layer between the surface layer and the bottom layer is the glue-containing bamboo sheet prepared in step 3, which is pre-pressed after paving and assembling to obtain a slab; Step 5: hot-press the slab to obtain a bamboo-wood composite board.

2. The method for preparing a bamboo-wood composite board with efficient bamboo utilization according to claim 1, characterized in that: In the step 2, the planing angle of the planer on the bamboo material to be planed is 60-85 degrees.

3. The method for preparing a bamboo-wood composite board with high-efficiency utilization of bamboo materials as claimed in claim 1, characterized in that: The thickness of the bamboo slices prepared in step 2 is 0.5-1.5 mm.

4. The method for preparing a bamboo-wood composite board with high-efficiency utilization of bamboo materials as claimed in claim 1, characterized in that: The amount of the dipping glue in the step 3 is 7-15% of the total weight of the bamboo slices after drying.

5. The method for preparing a bamboo-wood composite board with high-efficiency utilization of bamboo materials as claimed in claim 1, characterized in that: The moisture content of the glue-containing bamboo slices obtained after secondary drying in step 3 is 6-12%.

6. The method for preparing a bamboo-wood composite board with high-efficiency utilization of bamboo materials as claimed in claim 1, characterized in that: The surface layer and the bottom layer in step 4 are symmetrically composed of 2-5 layers of wooden veneers; or the surface layer is composed of woven bamboo mats and 1-4 layers of wooden veneers, and the bottom layer is composed of 2-5 layers of wooden veneers.

7. The method for preparing a bamboo-wood composite board with high-efficiency utilization of bamboo materials as claimed in claim 1, characterized in that: In the step 4, the thickness of the surface layer and the bottom layer is 5-10 mm, the thickness of the middle layer is 5-45 mm, and the total thickness is 10-55 mm.

8. The method for preparing a bamboo-wood composite board with high-efficiency utilization of bamboo materials as claimed in claim 1, characterized in that: The hot pressing temperature in step 5 is 130-150° C., the hot pressing pressure is 2.5-5.0 MPa, and the hot pressing time is 1.0-1.2 min / mm of the total thickness.

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