Pressure-resistant corrugated board

Abstract

The utility model discloses a pressure-resistant corrugated board, which relates to the technical field of corrugated boards and comprises outer-layer paperboards, middle-layer paperboards and an inner-layer paper core, the two middle-layer paperboards are respectively positioned on two sides of the inner-layer paper core, and the outer-layer paperboards are arranged on one sides, far away from the inner-layer paper core, of the middle-layer paperboards; wherein a plurality of bending parts are arranged on the side, facing the inner-layer paper core, of the middle-layer paper board at equal intervals, the inner-layer paper core is of a wave-shaped structure, wave trough gaps are formed between adjacent wave crests of the wave-shaped structure, the inner-layer paper core is provided with a plurality of wave trough gaps, and the wave trough gaps are of approximately triangular structures, so that the rigidity of the corrugated board is effectively improved; when the corrugated board is locally pressed, the two sides of each trough gap are deformed to a certain degree, and due to the fact that the bent part of the middle-layer paper board is tightly matched with the inner-layer paper core, pressure can be evenly dispersed into the adjacent trough gaps, the middle-layer paper board and the inner-layer paper core can jointly bear force, and the corrugated board is light and resistant to pressure.

Description

Technical Field

[0001] This utility model relates to the field of corrugated cardboard technology, and in particular to a pressure-resistant corrugated cardboard. Background Technology

[0002] Corrugated cardboard is a type of board material composed of a corrugated core layer and a cover layer formed between two or more layers of cardboard. It is commonly known as "corrugated sheet", "corrugated paper", "corrugated core paper", "corrugated paper core", or "corrugated base paper". The wavy structure of the corrugated core layer forms continuous arched load-bearing units, which are arranged side by side in a row and support each other to form a triangular structure. It has good mechanical strength, can withstand a certain amount of pressure on a flat surface, and is elastic with good cushioning effect.

[0003] Chinese Patent Publication No. CN222648472U discloses a high-strength corrugated cardboard with high pressure and bending resistance, comprising an upper cardboard layer, a middle cardboard layer, a lower cardboard layer, and a corrugated core. The upper and lower cardboard layers are located on the upper and lower sides of the middle cardboard layer, respectively. The corrugated core is disposed between the upper and middle cardboard layers and between the middle and lower cardboard layers. Multiple evenly distributed pressure-resistant elastic strips are provided in the corrugated gaps of the corrugated core. Bending-resistant reinforcing ribs are provided inside both the upper and lower cardboard layers. This invention improves the pressure and bending resistance of the corrugated cardboard by adding pressure-resistant elastic strips and bending-resistant reinforcing ribs inside the cardboard, without significantly changing the thickness of the cardboard, thus improving space utilization and practicality.

[0004] The above-mentioned technology has greatly improved the pressure resistance of corrugated cardboard by adding pressure-resistant elastic strips and bending-resistant reinforcing ribs. However, the addition of different materials increases the production cost and weight of the corrugated cardboard, making it unsuitable for widespread application. Therefore, this utility model discloses a pressure-resistant corrugated cardboard to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to provide a pressure-resistant corrugated cardboard to solve the problem mentioned in the background art that the addition of different materials to traditional pressure-resistant corrugated cardboard increases the production cost and the weight of the finished product, making it unsuitable for widespread application.

[0006] To achieve the above objectives, the present invention provides the following solution to the above technical problems: a pressure-resistant corrugated cardboard, comprising an outer cardboard, a middle cardboard, and an inner core, wherein two middle cardboards are respectively located on both sides of the inner core, and an outer cardboard is provided on the side of each middle cardboard away from the inner core;

[0007] The middle layer paperboard has multiple bends equidistantly arranged on the side facing the inner paper core. The inner paper core has a wavy structure, and there are trough gaps between adjacent peaks of the wavy structure. The side of the bend away from the middle layer paperboard is in contact with the inner wall of the corresponding trough gap.

[0008] As a further embodiment of this utility model, the bent portion has an arched structure or a polygonal structure.

[0009] As a further embodiment of this utility model, a flat portion is formed on the middle layer cardboard and between the two bends.

[0010] As a further embodiment of this utility model, a first adhesive portion is provided at the contact area between the flat portion and the outer cardboard.

[0011] As a further embodiment of this utility model, a second adhesive portion is provided at the contact area between the bent portion and the trough gap.

[0012] As a further embodiment of this utility model, a third adhesive portion is provided between the crest portion and the planar portion of the inner paper core.

[0013] As a further embodiment of this utility model, a waterproof layer is provided on the side of the outer cardboard away from the middle cardboard and the inner core.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This utility model discloses a pressure-resistant corrugated cardboard. The inner core has multiple trough gaps, and the cross-section of each trough gap is nearly triangular, which effectively improves the rigidity of the corrugated cardboard. When the corrugated cardboard is locally compressed, a certain degree of deformation occurs on both sides of the trough gap. Since the bending part of the middle cardboard is closely matched with the inner core, the pressure can be evenly distributed to the adjacent trough gaps, so that the middle cardboard and the inner core can share the load, making the corrugated cardboard lightweight and pressure-resistant.

[0016] This utility model discloses a pressure-resistant corrugated cardboard with an arched structure at the bend. When pressure is applied to the top of the arched structure, the force is transmitted to both sides along the curve of the arch and eventually distributed to the support point. This is more conducive to evenly distributing the pressure to adjacent load-bearing units. Furthermore, the arched structure has good recovery ability within its elastic range. When subjected to external force, the arched structure will undergo elastic deformation, and when the external force is removed, the arched structure can return to its original shape. This not only gives the corrugated cardboard good cushioning ability, but also allows it to return to its original shape after the load is removed, resulting in good pressure resistance. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] Figure 1 This is a perspective view of Embodiment 1 of the pressure-resistant corrugated cardboard of this utility model;

[0019] Figure 2 This is a side view of Embodiment 1 of the pressure-resistant corrugated cardboard of this utility model;

[0020] Figure 3 This utility model provides a pressure-resistant corrugated cardboard attachment Figure 2 Enlarged view of the structure at point A in the image;

[0021] Figure 4 This utility model provides a pressure-resistant corrugated cardboard attachment Figure 2 Enlarged view of the structure at point B in the image;

[0022] Figure 5 This is a structural diagram of the middle layer paperboard and inner core paperboard combination in Embodiment 1 of the pressure-resistant corrugated cardboard of this utility model;

[0023] Figure 6 This is a side view of Embodiment 2 of the pressure-resistant corrugated cardboard of this utility model.

[0024] The attached diagram lists the components represented by each number as follows:

[0025] 1. Outer paperboard; 2. Middle paperboard; 21. Bending section; 22. Flat section; 3. Inner paper core; 31. Corrugation gap; 4. First adhesive section; 5. Second adhesive section; 6. Third adhesive section. Detailed Implementation

[0026] The present invention will be further described below with reference to the embodiments.

[0027] Example 1, please refer to Figure 1-6 This utility model provides a pressure-resistant corrugated cardboard, including an outer cardboard 1, a middle cardboard 2 and an inner core 3. The two middle cardboards 2 are respectively located on both sides of the inner core 3, and the outer cardboard 1 is provided on the side of the middle cardboard 2 away from the inner core 3.

[0028] Specifically, the outer paperboard 1, the middle paperboard 2, and the inner paper core 3 are all made of paper. The outer paperboard 1 can be kraft paper, the middle paperboard 2 can be white cardboard, and the inner paper core 3 can be polyurethane (PU) coated paper.

[0029] Furthermore, the middle paperboard 2 is provided with a plurality of bends 21 at equal intervals on the side facing the inner paper core 3. The inner paper core 3 has a wavy structure, and a trough gap 31 is provided between adjacent peaks of the wavy structure. The side of the bend away from the middle paperboard contacts the inner wall of the corresponding trough gap. The bend 21 has an arched structure.

[0030] Specifically, the bending part 21 is an arched structure. When pressure is applied to the top of the arched structure, the force will be transmitted to both sides along the curve of the arch and eventually distributed to the support point. This is more conducive to distributing the pressure to the entire structure. Moreover, the arched structure has good recovery ability within the elastic range. When subjected to external force, the arched structure will undergo elastic deformation. When the external force is removed, the arched structure can return to its original shape. This not only gives the corrugated cardboard good cushioning ability, but also allows the corrugated cardboard to return to its initial shape after the load is removed, resulting in good pressure resistance.

[0031] Furthermore, a flat portion 22 is formed on the middle layer cardboard 2 and between the two bends 21;

[0032] Specifically, the flat portion 22 is located between the two bent portions 21, serving as a connection and transition. This design makes the middle cardboard 2 structurally more stable, better able to withstand and distribute pressure, and the flat portion 22 provides a foundation for bonding the outer cardboard 1.

[0033] Furthermore, a first adhesive portion 4 is provided at the contact point between the flat portion 22 and the outer cardboard 1;

[0034] A second adhesive portion 5 is provided at the contact point between the bending portion 21 and the trough gap 31; a third adhesive portion 6 is provided between the crest portion of the inner paper core 3 and the flat portion 22.

[0035] Specifically, by setting the first adhesive part 4, the second adhesive part 5 and the third adhesive part 6, the outer paperboard 1, the middle paperboard 2 and the inner paper core 3 can be bonded and fixed into an integrated structure, ensuring the stability and compressive strength of the overall structure. The adhesive material can be a high-strength adhesive, such as polyvinyl acetate emulsion glue (white glue) or hot melt glue.

[0036] Furthermore, a waterproof layer is provided on the side of the outer cardboard 1 that is away from the middle cardboard 2 and the inner paper core 3;

[0037] Specifically, the waterproof layer can be a polyethylene film layer. The waterproof layer can effectively prevent moisture from penetrating into the interior of the corrugated cardboard, avoiding problems such as reduced cardboard strength and softening of the paper core caused by a humid environment, thereby extending the service life of the corrugated cardboard. It can also prevent external moisture from contacting the contents of the package, preventing the contents from getting damp and damaged. It is especially suitable for packaging food, electronic products and other items with high moisture-proof requirements.

[0038] Example 2 differs from Example 1 in that the bent portion 21 has a polygonal structure;

[0039] In this embodiment, the inner core 3 has multiple trough gaps 31, and the trough gaps 31 are all nearly triangular in shape, which effectively improves the rigidity of the corrugated cardboard. When the corrugated cardboard is locally compressed, the two sides of the trough gaps 31 will deform to a certain extent. Since the bending part 21 of the middle cardboard 2 is closely matched with the inner core 3, the pressure can be evenly distributed to the adjacent trough gaps 31, so that the middle cardboard 2 and the inner core 3 can bear the load together, making the corrugated cardboard lightweight and pressure resistant.

Claims

1. A pressure-resistant corrugated paperboard comprising an outer paperboard (1), a middle paperboard (2), and an inner paper core (3), characterized in that, The two middle paperboards (2) are located on both sides of the inner paper core (3), and the middle paperboards (2) are provided with outer paperboards (1) on the side away from the inner paper core (3). The middle layer paperboard (2) has multiple bends (21) equidistantly arranged on the side facing the inner core (3). The inner core (3) has a wavy structure, and a trough gap (31) is provided between adjacent peaks of the wavy structure. The side of the bend (21) away from the middle layer paperboard (2) is in contact with the inner wall of the corresponding trough gap (31). The bend (21) has an arched structure or a polygonal structure. A flat part (22) is formed on the middle layer paperboard (2) between two bends (21).

2. The pressure-resistant corrugated cardboard according to claim 1, characterized in that: The contact area between the flat part (22) and the outer cardboard (1) is provided with a first adhesive part (4).

3. A pressure-resistant corrugated paperboard according to claim 1, characterized in that: A second adhesive part (5) is provided at the contact point between the bent part (21) and the trough gap (31).

4. The pressure-resistant corrugated paperboard according to claim 1, wherein: A third adhesive portion (6) is provided between the crest portion and the flat portion (22) of the inner paper core (3).

5. A pressure-resistant corrugated paperboard according to claim 1, characterized in that: The outer cardboard (1) is provided with a waterproof layer on the side away from the middle cardboard (2) and the inner core (3).

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