High-strength light environment-friendly corrugated board

Abstract

The utility model relates to the technical field of paperboards, in particular to a high-strength light-weight environment-friendly corrugated board, which mainly solves the problem that the high strength and the light weight of the corrugated board in the prior art cannot be achieved at the same time, and comprises a corrugated board body, and the corrugated board body comprises a surface layer, an inner layer, a first compression-resistant layer and a second compression-resistant layer. The lower surface of the first compression-resistant layer is compounded with the upper surface of the inner layer through a first glue layer, the lower surface of the second compression-resistant layer is compounded with the upper surface of the first compression-resistant layer through a second glue layer, and the lower surface of the surface layer is compounded with the upper surface of the second compression-resistant layer through a third glue layer; the first compression-resistant layer and the second compression-resistant layer each comprise a plurality of compression-resistant units, each compression-resistant unit is of a honeycomb structure formed by transversely arranging hexagonal paper cores, every two adjacent compression-resistant units are compositely connected through a connecting piece of a wave structure, and the compression-resistant units and the connecting pieces are distributed in a staggered mode in the longitudinal direction.

Description

Technical Field

[0001] This utility model relates to the field of cardboard technology, and in particular to a high-strength, lightweight, and environmentally friendly corrugated cardboard. Background Technology

[0002] Corrugated paper is a sheet-like material made by bonding linerboard and corrugated paper formed by corrugating rollers. Corrugated paper has been invented and used for more than 100 years. It has advantages such as low cost, light weight, easy processing, high strength, excellent printability, and convenient storage and transportation. More than 80% of corrugated paper can be recycled. Corrugated paper can be used for packaging food or digital products. It is relatively environmentally friendly and widely used. In particular, corrugated paper composite boards can be used to make lightweight partitions, sound insulation boards, heat insulation boards, furniture, and disposable beach tables for export.

[0003] However, corrugated cardboard is made by bonding at least one layer of corrugated paper and one layer of linerboard. In order to reduce the cost of use, most corrugated cardboard only has one layer of corrugated paper inside, which makes the structure of the corrugated cardboard weak and results in poor pressure resistance. Increasing the number of corrugated paper layers will increase the weight of the corrugated cardboard. Utility Model Content

[0004] Therefore, in view of the above problems, this utility model provides a high-strength, lightweight, and environmentally friendly corrugated cardboard, which mainly solves the problem that high strength and lightweight are mutually exclusive in the existing technology of corrugated cardboard.

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

[0006] A high-strength, lightweight, and environmentally friendly corrugated cardboard includes a corrugated cardboard body. The corrugated cardboard body has a transverse direction extending along its length and a longitudinal direction extending along its width. The corrugated cardboard body includes a face layer, an inner layer, a first compression-resistant layer, and a second compression-resistant layer. The lower surface of the first compression-resistant layer is bonded to the upper surface of the inner layer through a first adhesive layer. The lower surface of the second compression-resistant layer is bonded to the upper surface of the first compression-resistant layer through a second adhesive layer. The lower surface of the face layer is bonded to the upper surface of the second compression-resistant layer through a third adhesive layer.

[0007] The first and second compression-resistant layers each include a plurality of compression-resistant units. The compression-resistant units are honeycomb structures formed by horizontally arranging hexagonal paper cores. Adjacent compression-resistant units are connected by a wave-shaped connecting piece, so that the compression-resistant units and the connecting piece are staggered along the longitudinal direction.

[0008] Furthermore, the orthographic projection of the connecting piece on the first compression layer does not coincide with the orthographic projection of the connecting piece on the second compression layer.

[0009] Furthermore, the orthographic projection of the compression-resistant unit on the first compression-resistant layer partially overlaps with the orthographic projection of the compression-resistant unit on the second compression-resistant layer, and the overlap rate is 20% to 35%.

[0010] Furthermore, the height of the first compression-resistant layer is 2.2mm to 3.2mm, and the number of paper cores in the compression-resistant unit of the first compression-resistant layer is 50±2 per 30cm.

[0011] Furthermore, the height of the second compression-resistant layer is 3.6mm to 4.5mm, and the number of paper cores in the compression-resistant unit of the second compression-resistant layer is 34±2 per 30cm.

[0012] By adopting the aforementioned technical solution, the beneficial effects of this utility model are as follows: This high-strength, lightweight, and environmentally friendly corrugated cardboard, through the setting of a double compression-resistant structure with alternating distribution of compression-resistant units with honeycomb structures and corrugated connecting pieces, forms a continuous stress transmission path in the longitudinal direction, enabling the hexagonal honeycomb structure to provide uniform stress distribution in the transverse direction, thereby improving the planar compression strength compared to the traditional single-corrugated structure; furthermore, the corrugated connecting pieces generate elastic deformation space in the longitudinal direction, absorbing impact energy and increasing the edge crush strength by more than 30%; at the same time, the alternating distribution of honeycomb units and corrugated pieces forms a topology-optimized structure, reducing the amount of core paper used by 18% to 22% under the same strength, thus achieving lightweighting. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the corrugated cardboard body along the vertical direction in an embodiment of this utility model;

[0014] Figure 2 This is a cross-sectional view of the corrugated cardboard body along the horizontal direction in an embodiment of this utility model. Detailed Implementation

[0015] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0016] The embodiment of this utility model is as follows:

[0017] refer to Figure 1 and Figure 2As shown, a high-strength, lightweight, and environmentally friendly corrugated cardboard includes a corrugated cardboard body 1. The corrugated cardboard body 1 has a transverse direction extending along its length and a longitudinal direction extending along its width. The corrugated cardboard body 1 includes a face layer 11, an inner layer 12, a first compression-resistant layer 13, and a second compression-resistant layer 14. The lower surface of the first compression-resistant layer 13 is bonded to the upper surface of the inner layer 12 via a first adhesive layer 15. The lower surface of the second compression-resistant layer 14 is bonded to the upper surface of the first compression-resistant layer 13 via a second adhesive layer 16. The lower surface of the face layer 11 is bonded to the upper surface of the second compression-resistant layer 14 via a third adhesive layer 17. Both the first compression-resistant layer 13 and the second compression-resistant layer 14 include a plurality of compression-resistant units 101. The compression-resistant units 101 are honeycomb structures formed by transversely arranged hexagonal paper cores. Adjacent compression-resistant units 101 are bonded together by a corrugated connecting piece 102, such that the compression-resistant units 101 and the connecting piece 102 are staggered along the longitudinal direction.

[0018] This high-strength, lightweight, and environmentally friendly corrugated cardboard features a double compression-resistant structure with alternating honeycomb-structured compression-resistant units 101 and corrugated connecting pieces 102. This creates a continuous stress transfer path in the longitudinal direction, allowing the hexagonal honeycomb structure to provide uniform stress distribution in the transverse direction, thus improving planar compression strength compared to traditional single-corrugated structures. Furthermore, the corrugated connecting pieces 102 generate elastic deformation space in the longitudinal direction, absorbing impact energy and increasing edge crush strength by more than 30%. Simultaneously, the alternating distribution of honeycomb units and corrugated pieces forms a topology-optimized structure, reducing core paper usage by 18% to 22% while maintaining the same strength, achieving lightweighting.

[0019] Furthermore, the orthographic projection of the connecting piece 102 on the first compressive layer 13 does not coincide with the orthographic projection of the connecting piece 102 on the second compressive layer 14. Through the staggered projection design of the two connecting pieces 102, a three-dimensional support network is formed, avoiding stress superposition in the vertical direction and increasing the puncture resistance by 25%. It also enhances the interlayer shear force dispersion ability, and the interlayer peel strength is ≥220N / m as tested by GB / T 22894. The staggered layout reduces the overlapping area of ​​materials, reducing the overall basis weight by 12-15g / m. 2 .

[0020] Furthermore, the orthographic projection of the compression-resistant unit 101 on the first compression-resistant layer 13 partially overlaps with the orthographic projection of the compression-resistant unit 101 on the second compression-resistant layer 14, and the overlap rate is 20% to 35%, preferably 25%, and more preferably 28%. By limiting the unit projection overlap rate to 20%-35%, it is ensured that the upper and lower honeycomb structures form a local three-point support system, and the optimal flat compression strength reaches 640kPa. The area of ​​the overlapping region is precisely controlled to avoid stress concentration caused by full overlap, and the drop test breakage rate is reduced by 42%. The partial overlap design increases the longitudinal bending stiffness to 1.8 times that of traditional corrugated cardboard.

[0021] In this embodiment, the height of the first compression-resistant layer 13 is 2.2mm to 3.2mm, preferably 2.5mm. The number of paper cores in the compression-resistant units 101 of the first compression-resistant layer 13 is 50±2 per 30cm. The first compression-resistant layer 13 adopts a high-density honeycomb structure with a height of 2.2 to 3.2mm and 50±2 per 30cm, which enhances the surface rigidity. Furthermore, the precise size matches the surface stress distribution, reducing surface depression deformation by up to 55%. The thinner height design keeps the weight ratio of this layer at 28% to 32%, balancing the overall weight distribution. The height of the second compression-resistant layer 14 is 3.6mm to 4.5mm, preferably 4.2mm. The number of paper cores in the compression-resistant units 101 of the second compression-resistant layer 14 is 34±2 per 30cm. By increasing the honeycomb units, the buffering performance is improved, and a gradient density distribution is formed with the first compression-resistant layer 13, resulting in a longitudinal compression resilience rate ≥82%.

[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 high-strength, lightweight, environmentally friendly corrugated paperboard, characterized by: The corrugated board body has a transverse direction extending along the length direction thereof and a longitudinal direction extending along the width direction thereof, and comprises a face layer, a back layer, a first compression-resistant layer and a second compression-resistant layer, a lower surface of the first compression-resistant layer is compounded with an upper surface of the back layer through a first glue layer, a lower surface of the second compression-resistant layer is compounded with an upper surface of the first compression-resistant layer through a second glue layer, and a lower surface of the face layer is compounded with an upper surface of the second compression-resistant layer through a third glue layer; The first compression-resistant layer and the second compression-resistant layer each comprise a plurality of compression-resistant units in a honeycomb structure formed by transverse arrangement of paper cores in a hexagonal shape, and adjacent two compression-resistant units are connected in a wave structure.

2. The high-strength, lightweight, and eco-friendly corrugated paperboard according to claim 1, characterized by: The orthographic projection of the connecting pieces on the first compression-resistant layer does not coincide with the orthographic projection of the connecting pieces on the second compression-resistant layer.

3. The high-strength, lightweight, and eco-friendly corrugated paperboard according to claim 2, characterized by: The orthographic projection of the compression-resistant units on the first compression-resistant layer partially coincides with the orthographic projection of the compression-resistant units on the second compression-resistant layer, and the coincidence rate is 20% to 35%.

4. The high-strength, lightweight, environmentally friendly corrugated paperboard of any one of claims 1 to 3, wherein: The height dimension of the first compression-resistant layer is 2.2 mm to 3.2 mm, and the number of paper cores of the compression-resistant units of the first compression-resistant layer is 50±2 per 30 cm.

5. The high-strength, lightweight, environmentally friendly corrugated paperboard of any one of claims 1 to 3, wherein: The height dimension of the second compression-resistant layer is 3.6 mm to 4.5 mm, and the number of paper cores of the compression-resistant units of the second compression-resistant layer is 34±2 per 30 cm.

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