Preparation method of honeycomb bamboo board

Abstract

The invention discloses a preparation method of a honeycomb bamboo board, and relates to the technical field of packaging material production. The honeycomb bamboo board comprises an upper panel, a lower panel and a honeycomb core layer located between the upper panel and the lower panel, and the honeycomb core layer is composed of honeycomb units. The preparation method comprises the following steps: smearing an adhesive on the upper and lower surfaces of the honeycomb core layer, respectively covering the upper and lower panels on the honeycomb core layer, and then carrying out cold pressing; and the edge of the honeycomb bamboo board obtained after cold pressing is finished, and the surface of the honeycomb bamboo board is ground and polished. According to the manufacturing method of the honeycomb bamboo board, the honeycomb bamboo board manufactured through the manufacturing method has the high strength, the good buffering performance and the environment-friendly characteristic, so that the problem that an existing packaging material is insufficient in strength, buffering performance and environment-friendly performance is solved, and a novel high-performance packaging material solution is provided for the packaging industry.

Description

Technical Field

[0001] The invention relates to the technical field of packaging material production, in particular to a method for preparing a honeycomb bamboo board for packaging. Background Art

[0002] In the field of modern commerce and logistics, packaging materials play a vital role. Although traditional packaging paperboards such as corrugated paperboard are widely used, their limitations are gradually revealed as the market's requirements for packaging performance continue to increase. The strength of corrugated paperboard is often difficult to provide sufficient protection when facing some heavy, fragile or products with high requirements for cushioning performance. Moreover, corrugated paperboard is easily affected by moisture and deformed in a humid environment, affecting its packaging performance and service life. At the same time, with the increasing awareness of environmental protection, consumers and enterprises have also put forward higher requirements for the environmental protection of packaging materials. Some traditional packaging materials such as plastic foams are gradually restricted and abandoned because they are difficult to degrade and cause great pollution to the environment. Therefore, it has become an urgent need for the industry to develop a new type of packaging material that has high strength, good cushioning performance, and is environmentally friendly and degradable.

[0003] Bamboo is a natural renewable resource that grows fast and is widely distributed. Bamboo has high strength and toughness, and its fiber structure enables it to have certain compression and bending resistance. Applying bamboo to the packaging field can not only make full use of the excellent properties of bamboo, but also reduce dependence on traditional resources such as wood and plastic, which is in line with the concept of sustainable development. At present, the application of bamboo in the packaging field has not been fully utilized. Although there are some bamboo packaging products, most of them simply use the original shape of bamboo or carry out preliminary processing. In modern logistics and commodity packaging, its protection performance and standardization are difficult to meet the needs. As a bamboo processing product, flattened bamboo slices retain the natural texture and fiber characteristics of bamboo and have good appearance and physical properties. Inspired by honeycomb paperboard, if bamboo can be made into a similar honeycomb structure, combined with the advantages of bamboo itself, it is expected to develop a packaging material with better performance, overcome the shortcomings of traditional packaging materials, and meet the market demand for high-performance packaging materials. Summary of the invention

[0004] The invention provides a method for preparing a honeycomb bamboo board. The honeycomb bamboo board prepared by the preparation method has high strength, good cushioning performance and environmental protection characteristics, thereby solving the problems of insufficient strength, cushioning performance and environmental protection of existing packaging materials, and providing a new type of high-performance packaging material solution for the packaging industry.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: The honeycomb bamboo board comprises an upper and lower panel layer and a honeycomb core layer located between the upper and lower panel layers, wherein the honeycomb core layer is composed of honeycomb units; The preparation method comprises the following steps: A. After applying adhesive on the upper and lower surfaces of the honeycomb core layer, cover the upper and lower panels on the honeycomb core layer respectively, and then cold press; B. Trim the edges of the honeycomb bamboo board obtained after cold pressing, and grind and polish its surface.

[0006] In the above technical solution, a more specific technical solution may also be: the specific preparation method comprises the following steps: (1) After applying adhesive on the upper and lower surfaces of the honeycomb core layer, cover the upper and lower panels on the honeycomb core layer respectively, put them into a cold press and cold press them at a pressure of 0.1-0.2 MPa for 1-2 hours. During the cold pressing process, ensure that the pressure is stable and the panels are placed correctly; (2) The edges of the honeycomb bamboo panels obtained after cold pressing were trimmed, and the size error was controlled within ±0.8 mm. The surfaces were then ground and polished using 80-mesh, 120-mesh, and 240-mesh sandpapers, respectively.

[0007] Furthermore, the panel is a flattened bamboo sliced ​​sheet, and the preparation method of the flattened bamboo sliced ​​sheet comprises the following steps: (1) Select bamboos that are 3 to 5 years old, with a breast diameter of 10 cm, a wall thickness of 8 to 10 mm, and no obvious cracks or insect bites, and process them into bamboo tubes 100 to 150 cm long; (2) softening the bamboo tube at a temperature of 160 to 180° C. and a pressure of 1.0 to 1.5 MPa for 5 to 8 minutes, and flattening, removing green and yellowing of the softened bamboo tube through a flattening device to obtain flattened bamboo; (3) Apply glue with one side of the flattened bamboo facing upwards, with the amount of glue applied being 150-200 g / m², and then press at a pressure of 0.5-1.0 MPa for 1-2 hours to obtain a flattened bamboo laminate; (4) Glue is applied to the side surfaces of the flattened bamboo plywood in the length direction, and then the flattened bamboo plywood is glued for 1 to 2 hours under a pressure of 0.5 to 1.0 MPa to obtain a large-sized flattened bamboo plywood with a length of 200 to 500 cm and a width of 100 to 300 cm. The large-sized flattened bamboo plywood is sliced ​​into thin sheets with a thickness of 0.5 to 2.0 mm.

[0008] Furthermore, the honeycomb core layer is formed by rolling and splicing flattened bamboo sliced ​​thin sheet rolls, and the preparation method of the flattened bamboo sliced ​​thin sheet rolls comprises the following steps: (1) Select bamboos that are 3 to 5 years old, with a breast diameter of 10 cm, a wall thickness of 8 to 10 mm, and no obvious cracks or insect bites, and process them into bamboo tubes 100 to 150 cm long; (2) softening the bamboo tube at a temperature of 160 to 180° C. and a pressure of 1.0 to 1.5 MPa for 5 to 8 minutes, and flattening, removing green and yellowing of the softened bamboo tube through a flattening device to obtain flattened bamboo; (3) Using a planer to plane a single flattened bamboo to obtain a thin sheet with a thickness of 0.3 to 0.5 mm; (4) The obtained slices are finger-joined and then prepared into flattened bamboo sliced ​​slice rolls by a roll-making machine. The flattened bamboo sliced ​​slice rolls are then cut into fixed widths of 5 to 10 mm using a cutting device according to the size of the target product.

[0009] Furthermore, the method for preparing the honeycomb core layer comprises the following steps: (1) Apply glue on one side of the flattened bamboo sliced ​​sheet roll with a fixed width, with the amount of glue applied being 60-100 g / m 2 , a layer of release agent is applied on the surface of the mold, and then the bamboo slicing sheet is flattened and rolled around the mold, and the rolling speed is controlled between 5 and 10 m / min to finally obtain a honeycomb unit; (2) The manufactured honeycomb units are spliced ​​together, and a special positioning fixture is used during the splicing process to ensure the neat arrangement of the honeycomb units.

[0010] Furthermore, the honeycomb unit is a regular hexagonal honeycomb unit.

[0011] Furthermore, after the honeycomb unit is manufactured, it is inspected by a combination of a visual inspection system and manual touch inspection, and after the honeycomb core layer is spliced, a sampling tensile test is used to test the bonding strength.

[0012] Furthermore, after the panel and the honeycomb core layer are composited, the bonding strength is tested by a peel test.

[0013] Furthermore, during the post-processing and grinding process of the honeycomb bamboo board, the board surface is cleaned between each grinding process, and the grinding intensity and speed are controlled.

[0014] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art: 1. High strength and good buffering performance: The honeycomb structure combines the strength advantage of bamboo, so that the honeycomb bamboo board of the present invention has excellent compression resistance, impact resistance and buffering performance. According to the test, the compressive strength of the honeycomb bamboo board of the present invention is more than 50% higher than that of the traditional corrugated board of the same thickness, which can effectively withstand and disperse external forces and protect the items in the package from impact and extrusion. In the simulated drop test, the damage rate of the products packaged with the honeycomb bamboo board was significantly reduced.

[0015] 2. Environmental protection and sustainable development characteristics: Bamboo is a renewable resource, which reduces pollution to the environment. Honeycomb bamboo boards can be naturally degraded after being discarded, which is in line with the environmental protection development trend of modern packaging materials, helps companies improve their environmental protection image, and meets consumers' demand for green packaging.

[0016] 3. Good moisture-proof performance: Compared with traditional honeycomb paperboard, the honeycomb bamboo board of the present invention has better moisture-proof performance due to the characteristics of bamboo itself. The fiber structure of bamboo is relatively compact and its water absorption is weaker than that of paper, which can resist the influence of humid environment to a certain extent.

[0017] 4. Beauty and applicability: Flattened bamboo slices retain the natural beautiful texture of bamboo, which can improve the grade and visual effect of packaging. They are suitable for various products that require packaging appearance, such as high-end electronic products, gifts, etc. At the same time, it can be customized according to the packaging size and shape of different products, and has strong adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Flattening bamboo plywood to large sizes for panel sliced.

[0019] Figure 2 Diagram of the finger-joining process for flattening bamboo slices.

[0020] Figure 3 This is a diagram of the honeycomb unit rolling process.

[0021] Figure 4 A top view of the honeycomb core layer.

[0022] Figure 5 Schematic diagram of the composite of the face sheet and honeycomb core layer of the honeycomb bamboo board.

[0023] Among them, number 1 is flattened bamboo, 2 is flattened bamboo sliced ​​thin slices, 3 is a regular hexagonal mold, 4 is a roll of flattened bamboo sliced ​​thin slices, 5 is a honeycomb unit, 6 is a honeycomb core layer, and 7 is a panel. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to examples; A method for preparing a honeycomb bamboo board comprises the following steps: 1. Material preparation and processing, and preparation of flattened bamboo (1) Purchase bamboos that are 3 to 5 years old, with a breast diameter of 10 cm and a wall thickness of 8 to 10 mm. The bamboo surface should be free of obvious cracks, insect bites and other defects. After the purchased bamboo is transported to the processing workshop, professional cutting equipment is used to process the bamboo into bamboo tubes of a certain length, generally between 100 and 150 cm. During the cutting process, ensure that both ends of the bamboo tube are flat and the length error is controlled within ±1 cm.

[0025] (2) Place the processed bamboo tube into a high-temperature and high-pressure softening device with a softening temperature of 160-180°C, a softening pressure of 1.0-1.5 MPa, and a softening time of 5-8 min. During the softening process, monitor the temperature changes in real time to ensure that the temperature fluctuates within the set range. At the same time, observe the softening state of the bamboo tube. When the surface color of the bamboo tube becomes slightly darker and the texture becomes softer but still maintains a certain shape integrity, it indicates that the softening has achieved the best effect. Send the softened bamboo tube into the flattening device for flattening, de-greening, and de-yellowing.

[0026] (3) The flattened bamboo is sent to a press plate dryer for drying to prevent the flattened bamboo from shrinking. The moisture content of the flattened bamboo after drying is 9-11%.

[0027] (4) The flattened bamboo material should be tested for flatness, and the flatness error should be controlled within ±0.5mm.

[0028] 2. Preparation of flattened bamboo slices for panels (1) Bamboo green surface gluing and lamination (first gluing) Select flattened bamboo of qualified quality, clean its surface, remove impurities, dust and other factors that may affect the gluing quality. Place the flattened bamboo with the green side facing up on the gluing workbench and use precise gluing equipment to evenly apply the adhesive. The amount of glue applied is controlled according to the surface characteristics of the flattened bamboo, generally 150-200g / m 2 During the gluing process, ensure that the adhesive covers the entire bamboo green surface to avoid missing areas or uneven glue layer thickness.

[0029] The flattened bamboo coated with glue is stacked in the thickness direction according to the number of layers required by the design. During the stacking process, it is necessary to ensure that each layer of flattened bamboo is aligned to avoid misalignment. Then the stacked flattened bamboo is placed in a laminator. The pressure applied by the laminator is controlled at 0.5-1.0MPa and maintained for 1-2 hours to fully cure the adhesive to obtain a flattened bamboo laminate. After lamination, the flattened bamboo laminate is preliminarily inspected, including surface flatness, the presence of delamination, etc. Laminates that do not meet quality requirements should be removed in a timely manner.

[0030] (2) Flatten the bamboo laminate and glue it on the side (second gluing) Apply adhesive evenly on the lengthwise side of the flattened bamboo laminate, generally 150-200g / m 2, sent to the lateral press for lateral gluing of flattened bamboo laminates. The pressure applied by the press is controlled at 0.5-1.0 MPa and maintained for 1-2 hours to fully cure the adhesive to obtain large-sized flattened bamboo plywood. Its size is determined according to actual product requirements, generally between 200-500 cm in length and 100-300 cm in width. The final flattened bamboo sliced ​​board is fully inspected for quality, including thickness measurement and flatness inspection, to ensure that it meets the requirements of subsequent panel processing.

[0031] (3) Large size flattened bamboo plywood sliced Fix the large-sized flattened bamboo plywood on the precision slicer, adjust the slice parameters according to the designed panel sheet thickness, and finally obtain a panel sheet with a thickness of 0.5-2.0mm. The thickness uniformity of the sheet should be ensured during the slice process, and the thickness error should be controlled within ±0.1mm. The sliced ​​panel sheets should be properly stored to avoid scratches, contamination, etc.

[0032] 3. Preparation of honeycomb core flattened bamboo sliced ​​sheet rolls (1) Fix a single flattened bamboo on the workbench of a high-precision planer, adjust the height and cutting angle of the planer according to the designed slice thickness, control the planing speed to 2-5 m / min, and finally obtain a flattened sheet with a thickness of 0.3-0.5 mm. The planed flattened sheets need to be selected to remove damaged and defective products.

[0033] (2) Finger-joint the flattened bamboo slices obtained by planing on a finger-joining machine. Before finger-joining, the ends of the slices should be finely processed to ensure the fit of the finger joints. During the finger-joining process, environmentally friendly adhesives should be used. The adhesive should be applied evenly. The amount of adhesive applied is determined according to the finger-joining area and the performance of the adhesive, generally 100-200g / m 2 . The finger-joined thin sheets are cured in an environment with a temperature of 20-25°C and a relative humidity of 50-60%. During the curing process, external factors should be prevented from interfering with the curing of the adhesive to ensure the firmness of the finger joints. The thin sheets after finger jointing need to be quality inspected to check the strength of the finger joints and the overall flatness. The strength should meet the requirements of subsequent processing. The thin sheets after finger jointing are prepared into flattened bamboo sliced ​​thin sheet rolls by a roll making machine, and then the flattened bamboo sliced ​​thin sheet rolls are cut into fixed widths by high-precision cutting equipment according to the size of the target product, generally 5-10 mm. This fixed-width cut flattened bamboo sliced ​​thin sheet roll can meet the length and width requirements of the subsequent production of the honeycomb core layer.

[0034] 4. Preparation of Honeycomb Core Layer (1) Production of honeycomb unit Apply glue on one side of the flattened bamboo sliced ​​sheet roll with a fixed width, with the glue amount of 60-100g / m 2, a layer of release agent is applied on the surface of a special regular hexagonal mold, and then the bamboo sliced ​​thin sheet is flattened and rolled around the mold. The rolling speed is controlled between 5 and 10 m / min, and finally a honeycomb unit is obtained. After the rolling is completed, the honeycomb unit is preliminarily inspected after the mold is removed to check whether the shape of the honeycomb unit is a regular hexagon, whether the wall thickness is uniform, and whether the bonding is firm. This can be done by combining a visual inspection system and a manual touch inspection, and defective honeycomb units should be removed in time.

[0035] (2) Splicing of honeycomb core layer Splice the manufactured honeycomb units on the splicing workbench according to the predetermined arrangement. During the splicing process, use a special positioning fixture to ensure the neatness of the arrangement of the honeycomb units. The adhesive used for splicing must match the adhesive used when making the honeycomb units to ensure a good bonding effect. After applying the adhesive, the adjacent honeycomb units should be quickly spliced ​​together and fixed with a special fixture to prevent the honeycomb units from shifting before the adhesive cures. After curing for 30 to 60 minutes, remove the fixture and conduct a comprehensive inspection of the honeycomb core layer, including the arrangement of the honeycomb units, the bonding strength between the honeycomb units, etc. The bonding strength can be tested by sampling tensile testing, and the bonding strength should meet the design requirements.

[0036] 5. Composite panel and honeycomb core layer Apply adhesive evenly on the upper and lower surfaces of the prepared honeycomb core layer. During the application process, the amount of adhesive must be strictly controlled to avoid excessive leakage of adhesive. After the glue is applied, the flattened bamboo slices are used as panels to cover the honeycomb core layer evenly, and then the composite panels are placed in a cold press for pressurization. The cold pressing pressure is 0.1-0.2MPa, and the cold pressing time is 1-2h. During the cold pressing process, the pressure must be stable, and attention must be paid to the placement of the panel to avoid interference from external forces. After the cold pressing is completed, the quality of the panel is checked to check the bonding between the panel and the honeycomb core layer. It can be tested by peeling tests and other methods to ensure that the bonding strength meets the requirements.

[0037] 6. Post-processing of honeycomb bamboo board Use multiple sandpaper grinding processes to grind the surface of the board. First, use 80-mesh coarse sandpaper for preliminary grinding, and keep the grinding direction consistent to remove surface unevenness and impurities. Then use 120-mesh and 240-mesh sandpaper for further grinding. Clean the surface of the board between each grinding process to prevent sandpaper clogging. During the grinding process, control the strength and speed of the grinding to avoid excessive grinding that causes uneven thickness of the board or surface damage. Judge the grinding effect by combining visual inspection and touch inspection until the surface of the board is smooth and flat, without burrs or unevenness.

[0038] In addition, if you need to print logos, patterns and other information on the surface of honeycomb boards, give priority to environmentally friendly inks and advanced printing equipment. Before printing, the ink's adhesion, water resistance, abrasion resistance and other properties should be tested to ensure that they meet packaging printing standards. The printing equipment should be able to accurately control the amount of ink applied and the clarity of the printed pattern. During the printing process, the printing quality should be monitored in real time, and the integrity, clarity and color accuracy of the printed pattern should be checked through a visual inspection system. Boards with unqualified printing quality should be reprinted or processed. At the same time, attention should be paid to the drying process after printing, and the appropriate drying method (such as natural drying, hot air drying, etc.) should be selected according to the characteristics of the ink to ensure that the ink is fully dried and firmly attached to the surface of the honeycomb bamboo board.

[0039] If the honeycomb bamboo board is used as a packaging material for a specific product and the customer has requirements, the honeycomb bamboo board can be combined with the product packaging design for customized packaging. For example, for the packaging of some high-end electronic products, the honeycomb bamboo board can be made into a lining of a specific shape, and the product can be directly embedded in it during packaging to improve the convenience and aesthetics of the packaging. In this case, attention should be paid to the matching degree and buffer design between the honeycomb bamboo board and the product to ensure the stability and safety of the product in the packaging.

[0040] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a honeycomb bamboo board, characterized in that: The honeycomb bamboo board comprises an upper and lower panel layer and a honeycomb core layer located between the upper and lower panel layers, wherein the honeycomb core layer is composed of honeycomb units; The preparation method comprises the following steps: A. After applying adhesive on the upper and lower surfaces of the honeycomb core layer, cover the upper and lower panels on the honeycomb core layer respectively, and then cold press; B. Trim the edges of the honeycomb bamboo board obtained after cold pressing, and grind and polish its surface.

2. The method for preparing a honeycomb bamboo board according to claim 1, characterized in that The specific preparation method comprises the following steps: (1) After applying adhesive on the upper and lower surfaces of the honeycomb core layer, cover the upper and lower panels on the honeycomb core layer respectively, put them into a cold press and cold press them at a pressure of 0.1-0.2 MPa for 1-2 hours. During the cold pressing process, ensure that the pressure is stable and the panels are placed correctly; (2) The edges of the honeycomb bamboo board obtained after cold pressing were trimmed, and the size error was controlled within ±0.8 mm. Then, the surface was ground and polished, and 80 mesh, 120 mesh, and 240 mesh sandpaper were used for grinding.

3. A method for preparing a honeycomb bamboo board according to claim 1 or 2, characterized in that: The panel is a flattened bamboo sliced ​​sheet, and the preparation method of the flattened bamboo sliced ​​sheet comprises the following steps: (1) Select bamboos that are 3 to 5 years old, with a breast diameter of 10 cm, a wall thickness of 8 to 10 mm, and no obvious cracks or insect bites, and process them into bamboo tubes 100 to 150 cm long; (2) softening the bamboo tube at a temperature of 160 to 180° C. and a pressure of 1.0 to 1.5 MPa for 5 to 8 minutes, and flattening, removing green and yellowing of the softened bamboo tube through a flattening device to obtain flattened bamboo; (3) Apply glue with one side of the flattened bamboo facing upwards, with the amount of glue applied being 150-200 g / m², and then press at a pressure of 0.5-1.0 MPa for 1-2 hours to obtain a flattened bamboo laminate; (4) Glue is applied to the side surfaces of the flattened bamboo plywood in the length direction, and then the flattened bamboo plywood is glued for 1 to 2 hours under a pressure of 0.5 to 1.0 MPa to obtain a large-sized flattened bamboo plywood with a length of 200 to 500 cm and a width of 100 to 300 cm. The large-sized flattened bamboo plywood is sliced ​​into thin sheets with a thickness of 0.5 to 2.0 mm.

4. The method for preparing a honeycomb bamboo board according to claim 3, characterized in that: The honeycomb core layer is formed by rolling and splicing flattened bamboo sliced ​​thin sheet rolls, and the preparation method of the flattened bamboo sliced ​​thin sheet rolls comprises the following steps: (1) Select bamboos that are 3 to 5 years old, with a breast diameter of 10 cm, a wall thickness of 8 to 10 mm, and no obvious cracks or insect bites, and process them into bamboo tubes 100 to 150 cm long; (2) softening the bamboo tube at a temperature of 160 to 180° C. and a pressure of 1.0 to 1.5 MPa for 5 to 8 minutes, and flattening, removing green and yellowing of the softened bamboo tube through a flattening device to obtain flattened bamboo; (3) Using a planer to plane a single flattened bamboo to obtain a thin sheet with a thickness of 0.3 to 0.5 mm; (4) The obtained slices are finger-joined and then prepared into flattened bamboo sliced ​​slice rolls by a roll-making machine. The flattened bamboo sliced ​​slice rolls are then cut into fixed widths of 5 to 10 mm using a cutting device according to the size of the target product.

5. The method for preparing a honeycomb bamboo board according to claim 4, characterized in that: The preparation method of the honeycomb core layer comprises the following steps: (1) Apply glue on one side of the flattened bamboo sliced ​​sheet roll with a fixed width, with the amount of glue applied being 60-100 g / m 2 , a layer of release agent is applied on the surface of the mold, and then the bamboo slicing sheet is flattened and rolled around the mold, and the rolling speed is controlled between 5 and 10 m / min to finally obtain a honeycomb unit; (2) The manufactured honeycomb units are spliced ​​together, and a special positioning fixture is used during the splicing process to ensure the neat arrangement of the honeycomb units.

6. The method for preparing a honeycomb bamboo board according to claim 5, characterized in that: The honeycomb unit is a regular hexagonal honeycomb unit.

7. The method for preparing a honeycomb bamboo board according to claim 6, characterized in that: After the honeycomb unit is manufactured, it is inspected by a combination of a visual inspection system and manual touch inspection. After the honeycomb core layer is spliced, a sampling tensile test is used to test the bonding strength.

8. The method for preparing a honeycomb bamboo board according to claim 7, characterized in that: After the panel is composited with the honeycomb core layer, the bonding strength is tested by a peel test.

9. The method for preparing a honeycomb bamboo board according to claim 8, characterized in that: During the post-processing and grinding process of the honeycomb bamboo board, the surface of the board is cleaned between each grinding process, and the grinding intensity and speed are controlled.

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