Multi-layer corrugated board

Abstract

The utility model belongs to the technical field of corrugated boards, particularly relates to a multi-layer corrugated board, and aims to solve the problems that an existing corrugated board is simple in structure and poor in compression resistance, a plurality of holes are formed in a unique corrugated board, and water vapor is easy to accumulate in the holes to erode the corrugated board, the multi-layer corrugated board comprises a middle board and two external boards, corrugated core plates are fixedly connected between the external plates and the middle plates, the corrugated core plates are in a wave shape, a plurality of holes are formed between the corrugated core plates and the middle plates and between the corrugated core plates and the corresponding external plates, and filling columns are arranged in the holes. The corrugated board is reasonable in structural design, water vapor is guided through the trapezoidal board and the triangular board, the water vapor is absorbed through the multiple packed columns, the water vapor is prevented from being accumulated in the holes of the corrugated core board, the waterproof performance of the corrugated board is improved, the compression resistance of the corrugated board is improved through the buffer layer in the middle board, and reliability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of corrugated boards, in particular to a multi-layer corrugated board. Background Art

[0002] Corrugated cardboard is a composite material consisting of a layer of flat cardboard and two layers of corrugated cardboard. It is commonly used for packaging, transportation and storage, as well as for making cartons and cardboard packaging materials. Corrugated cardboard consists of a layer of flat cardboard and two layers of corrugated cardboard. The peaks and troughs of the corrugated cardboard form a corrugated structure. This structure gives the corrugated cardboard high rigidity and compressive strength, and it is also relatively lightweight. Corrugated cardboard has different wave patterns and thicknesses, and the appropriate type can be selected according to specific packaging needs. It is commonly used to package fragile goods, food, electronic products and other items that need protection, providing an economical and practical packaging solution.

[0003] The existing corrugated cardboard has a simple structure and poor compression resistance. In addition, there are multiple holes in the unique corrugated cardboard, which easily accumulates water vapor and corrodes the corrugated cardboard. Therefore, we propose a multi-layer corrugated cardboard to solve this problem. Utility Model Content

[0004] The purpose of the utility model is to solve the problems raised in the above background technology and to provide a multi-layer corrugated paperboard.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A multi-layer corrugated cardboard comprises an intermediate plate and two external plates, wherein a corrugated core plate is fixedly connected between the external plates and the intermediate plate, wherein the corrugated core plate is wavy, and a plurality of holes are formed between the corrugated core plate, the intermediate plate and the corresponding external plates, wherein filling columns are provided in the holes, wherein the material of the filling columns is set to be polyurethane foam, and the filling columns are fixedly connected to the corrugated core plate, wherein the external plates comprise a main plate layer and an outer plate, wherein the main plate layer and the outer plate are fixedly connected, and a buffer layer is provided in the intermediate plate.

[0007] In a preferred embodiment, the front and rear sides of the external plate are fixedly connected with trapezoidal plates, the front and rear sides of the intermediate plate are fixedly connected with triangular plates, and the two trapezoidal plates on the same side are symmetrically arranged.

[0008] In a preferred embodiment, the outer surface layer includes a coating layer and an elastic layer. The coating layer is made of polyurethane waterproof coating, and the elastic layer is woven from elastic fibers.

[0009] In a preferred embodiment, an adhesive layer is provided between the outer surface layer and the corresponding main surface layer, and the material of the adhesive layer is set to be polyurethane adhesive.

[0010] In a preferred embodiment, a cavity is provided in the buffer layer, a soft board is fixedly connected between the inner walls on both sides of the cavity, the cavity above the soft board is filled with nitrogen, and the material of the buffer layer is set to be rubber.

[0011] In a preferred embodiment, two air holes are opened on the outside of the cavity, and a connecting hole is opened on the outside of the middle plate. The connecting hole is connected to the corresponding air holes. The air holes and the connecting holes are arranged as small holes, and the air holes are located below the soft plate.

[0012] The beneficial effects of the utility model are:

[0013] The utility model has a reasonable structural design. It guides water vapor through the arrangement of trapezoidal plates and triangular plates, absorbs water vapor through multiple filling columns, prevents water vapor from accumulating in the holes of the corrugated core board, improves the waterproof performance of the corrugated board, and improves the compressive performance of the corrugated board through the arrangement of the buffer layer in the middle board, and has high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the three-dimensional structure of a multi-layer corrugated cardboard proposed in the utility model;

[0015] Figure 2 for Figure 1 A partial enlarged view of part A;

[0016] Figure 3 This is a front view structural diagram of a multi-layer corrugated cardboard proposed in the present invention;

[0017] Figure 4 This is a schematic structural diagram of an external board of a multi-layer corrugated cardboard proposed in the present invention;

[0018] Figure 5 This is a schematic structural diagram of a middle board of a multi-layer corrugated cardboard proposed by the present invention.

[0019] In the figure: 1. Middle board; 2. External board; 3. Corrugated core board; 4. Filling column; 5. Main board layer; 6. Coating layer; 7. Elastic layer; 8. Viscous layer; 9. Trapezoidal board; 10. Triangular board; 11. Buffer layer; 12. Soft board; 13. Air hole. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] Reference Figure 1-5 A multi-layer corrugated cardboard includes a middle plate 1 and two external plates 2. A corrugated core plate 3 is fixedly connected between the external plates 2 and the middle plate 1. The corrugated core plate 3 is wavy. A plurality of holes are formed between the corrugated core plate 3 and the middle plate 1 and the corresponding external plates 2. Filling columns 4 are arranged in the holes. The material of the filling columns 4 is set to polyurethane foam. The filling columns 4 are fixedly connected to the corrugated core plate 3. The external plates 2 include a main board layer 5 and an outer layer. The main board layer 5 and the outer layer are fixedly connected. A buffer layer 11 is arranged in the middle plate 1.

[0022] In the present invention, trapezoidal plates 9 are fixedly connected to the front and rear sides of the external plate 2, and triangular plates 10 are fixedly connected to the front and rear sides of the middle plate 1. The two trapezoidal plates 9 on the same side are symmetrically arranged. Through the arrangement of the trapezoidal plates 9 and the triangular plates 10, water vapor is more easily drawn into the corrugated core board 3, and thus absorbed by multiple filling columns 4.

[0023] In the present invention, the outer layer includes a coating layer 6 and an elastic layer 7. The material of the coating layer 6 is set to be a polyurethane waterproof coating, and the elastic layer 7 is woven from elastic fibers. The polyurethane waterproof coating can form a dense waterproof film, which effectively prevents moisture from penetrating into the external plate 2. The elastic fibers improve the tear resistance of the external plate 2.

[0024] In the present invention, an adhesive layer 8 is provided between the outer surface layer and the corresponding main surface layer 5 . The material of the adhesive layer 8 is set as polyurethane adhesive. The adhesive layer 8 enables the outer surface layer and the main surface layer 5 to be tightly connected.

[0025] In the present invention, a cavity is provided in the buffer layer 11 , and a soft board 12 is fixedly connected between the inner walls on both sides of the cavity. The cavity above the soft board 12 is filled with nitrogen, and the material of the buffer layer 11 is set to rubber.

[0026] It should be noted that by opening a cavity in the buffer layer 11, injecting nitrogen into the cavity can enhance the support and pressure resistance. After nitrogen is injected into the buffer layer 11, the nitrogen will fill the cavity, increasing the internal pressure of the buffer layer 11. This increased internal pressure will make the buffer layer 11 have better support and pressure resistance. When the buffer layer 11 is subjected to external pressure, the internal nitrogen-filled cavity will generate a reaction force, thereby reducing the impact of external pressure on the buffer layer 11.

[0027] Furthermore, nitrogen is an inert gas and does not react chemically with other substances. Therefore, it can maintain stability in the buffer layer 11. The temperature expansion coefficient of nitrogen is low, so after it is filled into the buffer layer 11, the buffer layer 11 will not expand due to the increase in temperature at high temperatures, thereby preventing the intermediate plate 1 from being damaged.

[0028] In the present invention, two air holes 13 are provided on the outside of the cavity, and a connecting hole is provided on the outside of the middle plate 1. The connecting hole is connected to the corresponding air hole 13. The air holes 13 and the connecting holes are arranged as small holes. The air holes 13 are located below the soft plate 12. Through the arrangement of the soft plate 12 and the space below the cavity, the nitrogen in the cavity has a certain expansion space, thereby preventing the middle plate 1 from expanding and being damaged when the buffer layer 11 is heated.

[0029] The working principle of the present invention is as follows: the corrugated core material is the wavy part of the corrugated cardboard. The corrugated structure in the corrugated core material usually contains many gaps and holes. Water vapor easily accumulates in these holes, causing damage to the corrugated cardboard from the inside. The setting of the filling column 4 plays a role in supporting and absorbing water vapor, preventing the corrugated cardboard from being damaged in a humid environment. When it is dry and the temperature is high, the water vapor in the filling column 4 evaporates out, and the compressive performance of the corrugated cardboard is improved through the buffer layer 11 set in the middle plate 1. The nitrogen in the buffer layer 11 will fill the cavity, increasing the internal pressure of the buffer layer 11, so that the buffer layer 11 has better support and compressive performance. When the buffer layer 11 is subjected to external pressure, the cavity filled with nitrogen inside will generate a reaction force, thereby reducing the influence of the external pressure on the buffer layer 11.

[0030] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A multi-layer corrugated cardboard, characterized in that: The invention comprises an intermediate plate (1) and two external plates (2), wherein a corrugated core plate (3) is fixedly connected between the external plates (2) and the intermediate plate (1), wherein the corrugated core plate (3) is wavy, and a plurality of holes are formed between the corrugated core plate (3), the intermediate plate (1) and the corresponding external plates (2), wherein filling columns (4) are arranged in the holes, wherein the material of the filling columns (4) is set to polyurethane foam, and the filling columns (4) are fixedly connected to the corrugated core plate (3), wherein the external plates (2) comprise a main plate layer (5) and an outer layer, wherein the main plate layer (5) and the outer layer are fixedly connected, and wherein a buffer layer (11) is arranged in the intermediate plate (1).

2. The multi-layer corrugated paperboard according to claim 1, characterized in that: The front and rear sides of the external plate (2) are both fixedly connected to a trapezoidal plate (9), the front and rear sides of the intermediate plate (1) are both fixedly connected to a triangular plate (10), and the two trapezoidal plates (9) on the same side are symmetrically arranged.

3. The multi-layer corrugated paperboard according to claim 1, characterized in that: The outer surface layer comprises a coating layer (6) and an elastic layer (7); the coating layer (6) is made of a polyurethane waterproof coating, and the elastic layer (7) is woven from elastic fibers.

4. The multi-layer corrugated paperboard according to claim 1, characterized in that: An adhesive layer (8) is provided between the outer surface layer and the corresponding main surface layer (5), and the material of the adhesive layer (8) is set to be polyurethane adhesive.

5. The multi-layer corrugated paperboard according to claim 1, characterized in that: A cavity is provided in the buffer layer (11), a soft plate (12) is fixedly connected between the inner walls on both sides of the cavity, the cavity above the soft plate (12) is filled with nitrogen, and the material of the buffer layer (11) is set to be rubber.

6. The multi-layer corrugated paperboard according to claim 5, characterized in that: Two air holes (13) are provided on the outside of the cavity, and a connecting hole is provided on the outside of the intermediate plate (1), the connecting hole being connected to the corresponding air hole (13), the air hole (13) and the connecting hole being arranged as fine holes, and the air hole (13) being located below the soft plate (12).

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