Corrugated board with honeycomb structure

Abstract

The utility model relates to the technical field of corrugated boards, in particular to a corrugated board with a honeycomb structure, which mainly solves the problems of low longitudinal compressive strength and poor buffering performance of a honeycomb paperboard in the prior art, and comprises a corrugated board body which comprises a surface layer, a middle layer and a bottom layer, the surface layer comprises a first surface layer, a second surface layer with a wave structure and a third surface layer with a wave structure, the second surface layer is provided with a second wave crest and a second wave trough, the third surface layer is provided with a third wave crest and a third wave trough, the lower surface of the second wave trough is compositely connected with the upper surface of the third wave trough, and the amplitude of the second wave crest is larger than that of the third wave crest; a plurality of grooves are concavely formed in the upper surface of the middle layer, the upper surface of the middle layer is in composite connection with the lower surface of the third surface layer, the third troughs are embedded in the grooves, and the upper surface of the bottom layer is in composite connection with the lower surface of the middle layer.

Description

Technical Field

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

[0002] Honeycomb paperboard is made based on the principle of honeycomb structure in nature. It is a new type of sandwich structure environmentally friendly and energy-saving material made by bonding corrugated paper into numerous hollow three-dimensional regular hexagons to form a whole load-bearing component - the paper core, and then bonding face paper to both sides of the core. For example, Chinese patent application No. 201220356442.6 discloses a honeycomb paperboard, which includes a paper core and face paper pasted on both sides of the paper core. The paper core is made of multiple hollow hexagonal prisms bonded together, with the sides of adjacent hexagonal prisms bonded together. The thickness of the paper core is 0.28 to 0.80 cm.

[0003] The aforementioned honeycomb paperboard uses a single-pore honeycomb core and a planar surface layer structure, which results in insufficient longitudinal compressive strength, typically below 10 MPa, and its cushioning performance is limited by the uniform honeycomb structure. Utility Model Content

[0004] Therefore, in view of the above problems, this utility model provides a corrugated cardboard with a honeycomb structure, which mainly solves the problems of low longitudinal compressive strength and poor cushioning performance of honeycomb cardboard in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A honeycomb corrugated cardboard includes a plate-shaped corrugated cardboard body with a transverse direction extending along its length, a longitudinal direction extending along its width, and a vertical direction extending along its height. The corrugated cardboard body includes a top layer, an intermediate layer, and a bottom layer. The top layer includes a first top layer, a second top layer with a wavy structure, and a third top layer with a wavy structure. The first, second, and third top layers are sequentially connected from top to bottom. The second top layer has a second peak and a second trough, and the third top layer has a third peak and a third trough. The lower surface of the second trough is connected to the upper surface of the third trough. The amplitude of the second peak is greater than the amplitude of the third peak, creating a buffer space between the second and third peaks. The intermediate layer is a honeycomb structure consisting of a plurality of hexagonal paper core units arranged in a honeycomb pattern. The upper surface of the intermediate layer has several recesses. The upper surface of the intermediate layer is connected to the lower surface of the third top layer, and the third trough is embedded in the recesses. The upper surface of the bottom layer is connected to the lower surface of the intermediate layer.

[0007] Furthermore, the intermediate layer includes a first honeycomb layer and a second honeycomb layer. The lower surface of the first honeycomb layer is bonded to the upper surface of the second honeycomb layer through an adhesive layer. The vertical thickness of the first honeycomb layer is 5mm to 12mm larger than that of the second honeycomb layer.

[0008] Furthermore, the pore size of the paper core of the first honeycomb layer is 6mm to 12mm.

[0009] Furthermore, the pore size of the paper core of the second honeycomb layer is 15mm to 25mm.

[0010] Furthermore, the bottom surface has an extension extending outward from its perimeter, which covers the side of the corrugated cardboard body. The four corners of the corrugated cardboard body are connected by corner wrapping to two adjacent extensions, the upper surface of the top layer, and the lower surface of the bottom layer.

[0011] Furthermore, the upper surface of the surface layer is coated with a waterproof membrane.

[0012] By adopting the aforementioned technical solution, the beneficial effects of this utility model are as follows: The corrugated cardboard with this honeycomb structure is composited with a first, second, and third surface layer. The difference in amplitude between the second and third surface layers creates a gradient buffer space, improving the efficiency of impact energy absorption and thus enhancing longitudinal compressive strength and buffering performance. Furthermore, the groove in the middle layer and the embedded third trough enhance interlayer shear strength, preventing peeling between the honeycomb core and the corrugated layer interface. The interlayer peel strength can reach 3.5–4.2 N / mm². 2 . Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present utility model;

[0014] Figure 2 This is a cross-sectional structural diagram of the corrugated cardboard body in an embodiment of this utility model;

[0015] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle. Detailed Implementation

[0016] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0017] The embodiment of this utility model is as follows:

[0018] refer to Figure 1 , Figure 2 and Figure 3As shown, a honeycomb corrugated cardboard includes a corrugated cardboard body 1 with a plate-like structure. The corrugated cardboard body 1 has a transverse direction extending along the length direction, a longitudinal direction extending along the width direction, and a vertical direction extending along the height direction. The corrugated cardboard body 1 includes a face layer 11, an intermediate layer 12, and a bottom layer 13. The face layer 11 includes a first face layer 111, a second face layer 112 with a wavy structure, and a third face layer 113 with a wavy structure. The first face layer 111, the second face layer 112, and the third face layer 113 are sequentially connected from top to bottom. The second face layer 112 has a second peak 101 and a second trough 102. The third face layer 113 has a third peak 201 and a third trough 202. The lower surface of the second trough 102 is compositely connected to the upper surface of the third trough 202. The amplitude of the second peak 101 is greater than that of the third peak 201, so that a buffer space 100 is formed between the second peak 101 and the third peak 201. The intermediate layer 12 is a honeycomb structure in which multiple hexagonal paper core units are arranged. The upper surface of the intermediate layer 12 is recessed with a number of grooves 2. The upper surface of the intermediate layer 12 is compositely connected to the lower surface of the third surface layer 113, and the third trough 202 is embedded in the groove 2. The upper surface of the bottom layer 13 is compositely connected to the lower surface of the intermediate layer 12. The upper surface of the surface layer 11 is compositely covered with a waterproof membrane 14.

[0019] This honeycomb corrugated cardboard is constructed by combining a first surface layer 111, a second surface layer 112, and a third surface layer 113. The difference in amplitude between the second surface layer 112 and the third surface layer 113 creates a gradient buffer space, improving the efficiency of impact energy absorption and thus enhancing longitudinal compressive strength and cushioning performance. Furthermore, the groove 2 in the middle layer 12 and the embedded engagement of the third trough 202 enhance interlayer shear strength, preventing delamination between the honeycomb core and the corrugated layer interface. The interlayer peel strength can reach 3.5–4.2 N / mm². 2 .

[0020] Furthermore, the intermediate layer 12 includes a first honeycomb layer 121 and a second honeycomb layer 122. The lower surface of the first honeycomb layer 121 is bonded to the upper surface of the second honeycomb layer 122 via an adhesive layer 3. The vertical thickness of the first honeycomb layer 121 is 5mm to 12mm larger than that of the second honeycomb layer 122, preferably 8mm. Through the gradient design of the double honeycomb structure layers, stress is gradually transmitted in the vertical direction, and the longitudinal compressive strength is improved by 40% to 60% compared to a single-layer honeycomb structure. The pore size of the paper core of the first honeycomb layer 121 is 6mm to 12mm, preferably 7mm, which increases the honeycomb wall density per unit area and achieves a lateral bending stiffness of 1200 to 1500 N·m. 2Suitable for heavy-duty packaging scenarios, the paper core of the second honeycomb layer 122 has a pore size of 15mm to 25mm, preferably 18mm. The paper core of the second honeycomb layer is filled with polyurethane foam particles, which improves the resilience coefficient and can absorb more than 80% of the impact energy from drops.

[0021] Furthermore, an extension 4 extends outward from the periphery of the bottom surface 13. The extension 4 covers the side of the corrugated cardboard body 1. The four corners of the corrugated cardboard body 1 are connected by corner protectors 5, which cover and connect two adjacent extensions 4, the upper surface of the top layer 11 and the lower surface of the bottom layer 13. The L-shaped composite covering of the extension 4 and the corner protectors 5 improves the tear resistance of the edges and corners, and the corner protectors also improve the lateral impact force.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A corrugated paperboard of honeycomb structure, characterized by: The corrugated paperboard body in a plate structure comprises a transverse direction extending along a length direction, a longitudinal direction extending along a width direction, and a vertical direction extending along a height direction, and comprises a face layer, an intermediate layer, and a bottom layer. The face layer comprises a first face layer, a second face layer in a wave structure, and a third face layer in a wave structure, which are sequentially connected from top to bottom. The second face layer has second wave crests and second wave troughs, and the third face layer has third wave crests and third wave troughs. The lower surface of the second wave trough is connected with the upper surface of the third wave trough, the amplitude of the second wave crest is greater than that of the third wave crest, so that a buffer space is formed between the second wave crest and the third wave crest. The intermediate layer is a honeycomb structure with a plurality of hexagonal paper core units arranged and distributed. The upper surface of the intermediate layer is concave with a plurality of grooves, and the upper surface of the intermediate layer is connected with the lower surface of the third face layer, and the third wave trough is embedded in the groove. The upper surface of the bottom layer is connected with the lower surface of the intermediate layer.

2. The corrugated paperboard of claim 1, wherein: The intermediate layer comprises a first honeycomb layer and a second honeycomb layer, the lower surface of the first honeycomb layer is connected with the upper surface of the second honeycomb layer by a glue layer, and the vertical thickness of the first honeycomb layer is 5-12 mm greater than that of the second honeycomb layer.

3. The corrugated paperboard of claim 2, wherein: The aperture of the paper core of the first honeycomb layer is 6-12 mm.

4. The corrugated paperboard of claim 2, wherein: The aperture of the paper core of the second honeycomb layer is 15-25 mm.

5. The corrugated paperboard of any one of claims 1 to 4, wherein: The bottom layer has an extension outwardly extending along a periphery, the extension is wrapped on the side surface of the corrugated paperboard body, and the four corners of the corrugated paperboard body are connected with adjacent two extensions, the upper surface of the face layer, and the lower surface of the bottom layer by corner wrapping.

6. The corrugated paperboard of claim 5, wherein: The upper surface of the face layer is compounded with a waterproof film.

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