Bamboo-based composite supporting plate and manufacturing method thereof

Abstract

A bamboo base frame is embedded in a supporting plate body, the bamboo base frame is of a multi-layer structure formed by laying and fixing bamboo canes, the bamboo canes in the same layer are arranged at intervals, the bamboo canes on the adjacent upper and lower layers are arranged in a staggered mode, a three-dimensional cavity is formed in the bamboo base frame, and the supporting plate body is formed by molding a thermoplastic material. The three-dimensional cavity is filled with a thermoplastic material, and a thermoplastic material layer which wraps the periphery of the bamboo base frame and permeates into the three-dimensional cavity is formed. The preparation method comprises the following steps: making bamboos into bamboo strips; the bamboo strips are made into a bamboo base frame; melting a thermoplastic material at the temperature of 200-250 DEG C, paving the thermoplastic material on the bottom and four side surfaces of the mold, putting the mold into a bamboo base frame, and paving another layer of thermoplastic material; and in the compression molding process, after the bulge is punctured, the bamboo-based composite supporting plate is obtained through cold press molding. The invention has the advantages of reasonable structure, good strength, simple manufacturing method and low manufacturing cost.

Description

Technical Field

[0001] The invention relates to the technical field of brick machine support plate manufacturing, in particular to a bamboo-based composite support plate and a manufacturing method thereof. Background Art

[0002] The brick machine pallet is a necessary tool for making bricks. When making bricks, a large exciting force will be generated on the brick machine pallet, so the brick machine pallet is required to have sufficient strength.

[0003] The original brick machine pallets are mostly made of solid wood or bamboo pieces. Due to the high temperature and humidity in the production environment during the brick making process, it is easy to cause deformation, cracking and wear of wood and bamboo. In addition, the cost of making brick machine pallets with wood and bamboo is high.

[0004] Nowadays, brick machine pallets are mostly molded from thermoplastic materials. Thermoplastic materials are easy to obtain (some recycled materials can be used). However, brick machine pallets made of thermoplastic materials lack internal support and have poor strength. The damage rate of brick machine pallets is high. In addition, the high temperature environment during the brick making process will cause the thermoplastic material to soften and deform.

[0005] In order to overcome the deformation, cracking and wear of bamboo pallets and the shortcomings of insufficient strength and high-temperature deformation of thermoplastic pallets, some manufacturers coat the surface of bamboo boards with thermosetting materials or thermoplastic materials, but they are prone to delamination and peeling, resulting in a short service life.

[0006] In order to solve the above problems, a process route is designed in which the bamboo and wood materials are first dried and then hot-pressed. This process route can effectively solve the problem of internal pressure caused by evaporation of internal moisture during hot-pressing. However, in the subsequent use of the product, new problems arise. Once the thermoplastic material on the surface of the product is cracked or damaged, the external moisture is absorbed by the dried bamboo and wood material inside, causing bulging on the surface, thereby affecting the service life. Therefore, the existing brick machine support plate and its manufacturing method need to be further improved. Summary of the invention

[0007] The purpose of the present invention is to make up for the above-mentioned deficiencies and disclose to the public a bamboo-based composite support plate with reasonable structure, good strength and long service life, and the manufacturing method thereof is simple and the manufacturing cost is low.

[0008] The technical solution of the present invention is achieved in this way: A bamboo-based composite pallet comprises a pallet body, wherein a bamboo base frame is embedded in the pallet body, wherein the bamboo base frame is a multi-layer structure formed by laying and fixing bamboo strips, wherein the bamboo strips in the same layer are arranged at intervals, and the bamboo strips in adjacent upper and lower layers are arranged in a staggered manner, so that a three-dimensional cavity is formed in the bamboo base frame, and the pallet body is molded from a thermoplastic material, wherein the thermoplastic material fills the three-dimensional cavity and forms a thermoplastic material layer which wraps around the periphery of the bamboo base frame and penetrates into the three-dimensional cavity.

[0009] The measures to further optimize this technical solution are: As an improvement, the bamboo strips of the adjacent upper and lower layers are arranged vertically, which is convenient for processing.

[0010] As an improvement, the bamboo strips are arranged along the length direction or the width direction of the support plate body.

[0011] As an improvement, the bamboo strips are at an angle of 45° to the length direction of the support plate body.

[0012] As an improvement, the bamboo strips of the bamboo base frame are fixed at the intersection with binding pieces, nails and screws, which is simple to operate and convenient to process.

[0013] As an improvement, the bamboo strips of the bamboo base frame are glued and fixed at the intersections.

[0014] As an improvement, in the bamboo base frame, in the same bamboo strip layer, the interval between adjacent bamboo strips is 0.15 to 3 times the width of the bamboo strip.

[0015] As an improvement, the bamboo base frame does not expose the surface of the thermoplastic material layer. This arrangement can ensure the consistency of the surface material, so that the surface has consistent wear resistance, and can avoid wear differences caused by inconsistent materials during use.

[0016] A method for preparing a bamboo-based composite support plate comprises the following steps: Step 1: Make bamboo strips: Make bamboo strips; Step 2: Making a bamboo base frame: laying, arranging, stacking and fixing bamboo strips to make a bamboo base frame; Step 3: Preparation of thermoplastic material: heating the thermoplastic material to melt it and making it into a shape matching the mold cavity; Step 4: Laying the material: Laying the thermoplastic material on the bottom and four sides of the mold, then placing the bamboo base frame (2) into the mold to position and fix it, and laying another layer of thermoplastic material on the bamboo base frame; Step 5: Compression molding: During the process of forming the thermoplastic material layer, the temperature of the molten thermoplastic material is between 200°C and 250°C. The heat is transferred to the bamboo base frame, causing the moisture in the bamboo slices to evaporate. The thermoplastic material layer bulges due to the internal air pressure. After the bulge is punctured, the temperature of the thermoplastic material is still ≥150°C. After the bulge is punctured and vented, the pressure is maintained, the puncture marks are bonded, and the bamboo-based composite pallet is obtained by cold pressing.

[0017] As an improvement, in the step 1, the bamboo strips are subjected to mildew-proofing and carbonization treatments.

[0018] The advantages of the present invention compared with the prior art are: The bamboo-based composite pallet of the present invention has a reasonable structure and adopts a bamboo base frame and a thermoplastic material to form a composite structure. The bamboo base frame is used as the internal base frame of the pallet, and the base frame is made of bamboo material, so the manufacturing cost is low. In addition, the bamboo base frame adopts a multi-layer structure and forms a three-dimensional cavity. The three-dimensional cavity is used to make the thermoplastic material and the bamboo base frame better "fused" together, thereby improving the bonding force between the two, thereby increasing the strength of the pallet.

[0019] The manufacturing method of the bamboo-based composite support plate of the present invention releases the internal pressure by puncturing the bulge during the molding process, so that the molding can be completed smoothly, eliminating the step of drying the bamboo material in the previous process, and the manufacturing method is simple; the cold pressing process is adopted during molding, which reduces the equipment requirements, can greatly reduce the production cost and the investment in production equipment, and thus achieves the purpose of reducing the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a cross-sectional structural diagram of the first embodiment of the present invention; Figure 2 is a three-dimensional structural diagram of the first embodiment of the present invention; Figure 3 is a three-dimensional structural diagram of a bamboo base frame according to a first embodiment of the present invention; Figure 4 yes Figure 3 Enlarged view of part A in the middle; Figure 5 is a three-dimensional structural diagram of a bamboo base frame according to a second embodiment of the present invention; Figure 6 yes Figure 5 Enlarged view of middle part B; Figure 7 It is a cross-sectional structural diagram of the bamboo base frame according to the third embodiment of the present invention.

[0021] The names of the reference numerals in the accompanying drawings of the present invention are: The support plate body 1, the bamboo base frame 2, the three-dimensional cavity 2a, the bamboo strips 3, and the thermoplastic material layer 4. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below in conjunction with the accompanying drawings: The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be used for other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0023] Those skilled in the art should understand that, in the disclosure of the present invention, the directions or positions indicated by the terms "longitudinal", "lateral", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, which are only simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the above terms should not be understood as limitations on the present invention.

[0024] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0025] Embodiment 1, as Figures 1 to 4 As shown, a bamboo-based composite pallet includes a pallet body 1, wherein the pallet body 1 is embedded with a bamboo base frame 2, wherein the bamboo base frame 2 is a multi-layer structure formed by laying and fixing bamboo strips 3, wherein the bamboo strips 3 in the same layer are arranged at intervals, and the bamboo strips 3 in adjacent upper and lower layers are arranged in an alternating manner, so that a three-dimensional cavity 2a is formed in the bamboo base frame 2, and the pallet body 1 is molded from a thermoplastic material, and the thermoplastic material fills the three-dimensional cavity 2a and forms a thermoplastic material layer 4 wrapped around the periphery of the bamboo base frame 2 and penetrating into the three-dimensional cavity 2a.

[0026] In this embodiment, the bamboo base frame 2 is provided with three layers, the first and third layers of bamboo strips 3 are arranged along the length direction of the pallet body 1, the second layer of bamboo strips 3 are arranged along the width direction of the pallet body 1, the bamboo strips 3 in the same layer are arranged in parallel, and the bamboo strips 3 in adjacent upper and lower layers are perpendicular to each other.

[0027] The bamboo strips 3 of the bamboo base frame 2 are fixed at the intersection with binding pieces, nails or screws. The binding pieces can be steel wires, iron wires, cable ties, etc. The above fixing structure is easy to operate and has low manufacturing cost.

[0028] The bamboo strips 3 are fixed to form the bamboo base frame 2, so that in the subsequent molding process, the structure of the bamboo base frame 2 can remain stable and prevent the bamboo strips 3 from moving away from the set position. When making the bamboo base frame 2, the bamboo strips 3 can also be fixed by gluing at the intersection to form the bamboo base frame 2.

[0029] In the bamboo base frame 2, in the same bamboo strip layer, the interval between adjacent bamboo strips 3 is 1.5 to 2 times the width of the bamboo strip 3. In the same bamboo strip layer, the bamboo strips of adjacent bamboo strips 3 are arranged in opposite directions; in other words, the bamboo strip of one bamboo strip 3 is arranged downward, and the bamboo strip of the adjacent bamboo strip 3 is arranged upward. Bamboo is composed of bamboo green, bamboo flesh, and bamboo yellow from the outside to the inside. Since there is a difference in shrinkage rate between bamboo green and bamboo yellow, when the bamboo is heated, due to the large shrinkage rate of bamboo yellow and the small shrinkage rate of bamboo green, an inward pulling force will be generated, causing the bamboo to bend in the direction of bamboo yellow. By staggering the bamboo strips 3, the bending forces of adjacent bamboo strips 3 can offset each other, so that the stability and strength of the bamboo base frame 2 are better.

[0030] According to the size specifications of the brick machine support plate, the thickness of the bamboo strips 3 can be set to 4-20 mm, and the bamboo base frame 2 is provided with 2-8 layers of bamboo strips.

[0031] like Figure 2 As shown, the bamboo base frame 2 does not expose the surface of the thermoplastic material layer 4. Such an arrangement can ensure the consistency of the surface material, so that the surface has consistent wear resistance, and the wear difference caused by inconsistent materials can be avoided during use.

[0032] Embodiment 2, as Figures 5 and 6 As shown, the support plate structure in this embodiment is similar to that in the first embodiment, except that, in this embodiment, the bamboo strips 3 are at an angle of 45° to the length direction of the support plate body 1 .

[0033] Specifically, in this embodiment, the bamboo frame 2 is provided with 3 layers, and the bamboo strips 3 are arranged obliquely, wherein the bamboo strips 3 of the first and third layers are inclined to the right at an angle of 45° along the length direction of the pallet body 1, and the bamboo strips 3 of the second layer are inclined to the left at an angle of 45° along the length direction of the pallet body 1. Similarly, the bamboo strips 3 in the same layer are arranged in parallel, and the bamboo strips 3 of adjacent upper and lower layers are perpendicular to each other.

[0034] Embodiment three, as Figure 7As shown, as an extension, the bamboo strips 3 of some layers can be arranged longitudinally. Preferably, the bamboo strips 3 of adjacent layers have different bamboo strips in different directions. For odd-numbered layers, the bamboo strips 3 are arranged transversely, that is, the bamboo strips face upward or downward, and for even-numbered layers, the bamboo strips 3 are arranged longitudinally, that is, the bamboo strips face left or right. Since the brick machine support plate mainly bears longitudinal loads, the bamboo strips 3 arranged longitudinally at intervals can further improve the bearing capacity and increase the service life of the brick machine support plate. In this embodiment, a total of 3 layers of bamboo strips are arranged, wherein the bamboo strips 3 of the middle layer are arranged longitudinally, and two bamboo strips 3 are combined to form a group, and in the same group, the bamboo strips are arranged inwards.

[0035] The bamboo-based composite support plate of the present invention has a reasonable structure, and adopts a bamboo base frame (bamboo material) and a thermoplastic material to form a composite structure. Under the premise of ensuring strength, the manufacturing cost can be reduced. Among them, the bamboo material is used to make the base frame, which is convenient to obtain and has a low manufacturing cost. The bamboo base frame 2 adopts a multi-layer structure and forms a three-dimensional cavity 2a. The three-dimensional cavity 2a is used to make the thermoplastic material and the bamboo base frame 2 better "combine" together, thereby improving the bonding force between the two, thereby increasing the strength of the support plate. The outer layer of the support plate is composed of a thermoplastic material, which has good strength and good wear resistance, and is suitable for use as a brick machine support plate.

[0036] The above-mentioned thermoplastic materials are PP, PE and the like.

[0037] A method for preparing a bamboo-based composite support plate comprises the following steps: Step 1, making bamboo strips 3: making bamboo strips 3; and performing mildew-proofing and carbonization treatment on the bamboo strips 3. In this embodiment, the mildew-proofing treatment is performed by spraying mildew-proofing agent on the bamboo strips 3, and the mildew-proofed bamboo strips are sent to a carbonization furnace for carbonization treatment.

[0038] Step 2: Making a bamboo base frame 2: Lay, arrange, stack and fix the bamboo strips 3 to make a bamboo base frame 2.

[0039] Step 3: Preparation of thermoplastic materials: Heat the thermoplastic materials to melt them and make them into a shape that matches the mold cavity. Thermoplastic materials can be heated by extruder heating, laminator heating, mixer heating, etc.

[0040] Step 4: Laying the material: Lay the thermoplastic material on the bottom and four sides of the mold, then put the bamboo base frame 2 into the mold to position and fix it, and lay another layer of thermoplastic material on the bamboo base frame 2.

[0041] Step 5, compression molding. During the process of forming the thermoplastic material layer, the temperature of the molten thermoplastic material is between 200°C and 250°C. The heat is transferred to the bamboo base frame 2, so that the water in the bamboo piece evaporates. The thermoplastic material layer is bulged by the internal air pressure. After the bulge is punctured, the temperature of the thermoplastic material is still ≥150°C. After the bulge is punctured and exhausted, the pressure is maintained, the puncture marks are bonded, and the bamboo-based composite pallet is obtained by cold pressing. When the temperature is 200°C-250°C, the thermoplastic material is in a molten state and has fluidity. Under the pressure of the molding, the fluidity of the material itself will naturally fill the void formed by the puncture of the bulge to ensure the integrity of the cost surface. During the molding process, the molding machine does not need to be heated, and a cold pressing process can be used.

[0042] The manufacturing method of the present invention releases the internal pressure by puncturing the bulge during the molding process, so that the molding can be completed smoothly, and the step of drying the bamboo material in the previous process is omitted, and the manufacturing method is simple; and cold pressing is adopted, which reduces the equipment requirements, can greatly reduce the production cost and the investment in production equipment, and thus achieves the purpose of reducing the production cost.

[0043] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A bamboo-based composite support plate, comprising a support plate body (1), characterized in that: The support plate body (1) is embedded with a bamboo base frame (2), and the bamboo base frame (2) is a multi-layer structure formed by laying and fixing bamboo strips (3). The bamboo strips (3) in the same layer are arranged at intervals, and the bamboo strips (3) in adjacent upper and lower layers are arranged in a staggered manner, so that a three-dimensional cavity (2a) is formed in the bamboo base frame (2). The support plate body (1) is molded from a thermoplastic material, and the thermoplastic material fills the three-dimensional cavity (2a) and forms a thermoplastic material layer (4) that wraps around the outer periphery of the bamboo base frame (2) and penetrates into the three-dimensional cavity (2a).

2. The bamboo-based composite support plate according to claim 1, characterized in that: The bamboo strips (3) of the adjacent upper and lower layers are arranged vertically.

3. The bamboo-based composite support plate according to claim 2, characterized in that: The bamboo strips (3) are arranged along the length direction or the width direction of the support plate body (1).

4. The bamboo-based composite support plate according to claim 2, characterized in that: The bamboo strips (3) are at an angle of 45° with respect to the length direction of the support plate body (1).

5. A bamboo-based composite support plate according to claim 3 or 4, characterized in that: The bamboo strips (3) of the bamboo base frame (2) are fixed at the intersections by means of binding pieces, nails or screws.

6. A bamboo-based composite support plate according to claim 3 or 4, characterized in that: The bamboo strips (3) of the bamboo base frame (2) are glued and fixed at the intersection.

7. A bamboo-based composite support plate according to claim 3 or 4, characterized in that: In the bamboo base frame (2), in the same bamboo strip layer, the interval between adjacent bamboo strips (3) is 0.15 to 3 times the width of the bamboo strip (3).

8. The bamboo-based composite support plate according to claim 7, characterized in that: The bamboo base frame (2) does not expose the surface of the thermoplastic material layer (4).

9. The method for preparing a bamboo-based composite support plate according to claim 1, characterized in that: The following steps are involved: Step 1, making bamboo strips (3): making bamboo strips (3); Step 2, making a bamboo base frame (2): laying out, arranging, stacking and fixing bamboo strips (3) to make a bamboo base frame (2); Step 3: Preparation of thermoplastic material: heating and melting the thermoplastic material and making it into a shape matching the mold cavity; Step 4: Laying the material: Laying the thermoplastic material on the bottom and four sides of the mold, then placing the bamboo base frame (2) into the mold to position and fix it, and laying another layer of thermoplastic material on the bamboo base frame (2); Step 5, compression molding: Compression molding: In the process of forming the thermoplastic material layer, the temperature of the molten thermoplastic material is between 200°C and 250°C, and the heat is transferred to the bamboo base frame (2), so that the water in the bamboo slices evaporates, and the thermoplastic material layer bulges due to the internal air pressure. After the bulge is punctured, the temperature of the thermoplastic material is still ≥150°C. After the bulge is punctured and the air is exhausted, the pressure is maintained, the puncture marks are bonded, and the bamboo-based composite pallet is obtained by cold pressing.

10. The method for preparing a bamboo-based composite support plate according to claim 9, characterized in that: In the step 1, the bamboo strips (3) are subjected to mildew-proofing and carbonization treatments.

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