Composite paperboard and carton

Abstract

The invention relates to a composite paperboard and a carton. The composite paperboard comprises a paperboard and supporting core paper. The paperboards are arranged on the two opposite sides of the supporting core paper in the thickness direction of the paperboards respectively. The supporting core paper is grid paper. The supporting core paper comprises a net knot part and hollow holes. And the paperboards on the two sides are respectively connected with the net knot part for supporting the core paper. The composite paperboard provided by the embodiment of the invention is beneficial to reducing the processing cost of the composite paperboard.

Description

Technical Field

[0001] The present application relates to the field of packaging technology, and in particular to a composite paperboard and a carton. Background Art

[0002] In the related art, the composite paperboard includes two layers of paper and an intermediate paper product. An intermediate paper product is arranged between the two layers of paper. The surface paper is generally thinner and lighter. The intermediate paper product can be a paperboard material, because the existing intermediate paper products are generally thicker, heavier and harder, and mainly play a supporting and cushioning role, such as corrugated paper. The corrugated paper is wavy as a whole. Usually, a composite paperboard of 1 meter in length requires 1.5 meters in length of corrugated paper. The amount of corrugated paper is relatively large, and it also makes the weight per unit volume of the composite paperboard heavier. The intermediate paper product can also be, for example, a three-dimensional honeycomb paper with greater hardness. The three-dimensional honeycomb paper includes a plurality of honeycomb-shaped through holes. The two layers of paper cover the two openings of the through holes respectively. The three-dimensional honeycomb paper can be formed by bonding multiple pieces of hard paper materials in sequence, and a row of honeycomb-shaped through holes is formed after two adjacent pieces of paper are bonded. The processing procedure of the three-dimensional honeycomb paper itself is relatively complicated, which affects the processing cost of the composite paperboard. Summary of the invention

[0003] The embodiments of the present application provide a composite paperboard and a carton, which are beneficial to reducing the processing cost of the composite paperboard.

[0004] The embodiment of the present application provides a composite paperboard, which includes paperboard and supporting core paper. Paperboards are respectively arranged on two opposite sides of the supporting core paper along the thickness direction of the paperboard. The supporting core paper is grid paper. The supporting core paper includes a mesh knot part and hollow holes. The paperboards on both sides are respectively connected to the mesh knot part of the supporting core paper.

[0005] The supporting core paper in the composite paperboard of the embodiment of the present application is a grid paper with hollow holes. The unit volume weight of the supporting core paper itself is relatively small, which is conducive to reducing the unit volume weight of the composite paperboard, thereby helping to reduce the overall weight of the composite paperboard. The supporting core paper can support the paperboards on both sides and improve the impact resistance and extrusion resistance of the paperboards on both sides. When the paperboard is subjected to impact force or extrusion force, the force can be dispersed and buffered by the supporting core paper. The supporting core paper includes a plurality of mesh knots. A plurality of mesh knots are arranged around each hollow hole. The paperboards on both sides are respectively connected to the mesh knots of the supporting core paper. When the paperboard is subjected to impact force or extrusion force, the paperboard can transmit the force to the supporting core paper through the mesh knots, and disperse and buffer it through the supporting core paper. The supporting core paper itself has a relatively simple structure and is easy to process and shape, which is conducive to reducing the processing cost of the composite paperboard.

[0006] In some achievable embodiments, the mesh portion includes a first connecting portion and a second connecting portion. Along the thickness direction of the cardboard, the first connecting portion is close to the cardboard on one side, and the second connecting portion is close to the cardboard on the other side. One of the cardboards on both sides is connected to the first connecting portion, and the other is connected to the second connecting portion.

[0007] The first connection part and the second connection part of the net knot part are arranged at intervals. The net knot part can be connected to the paperboards on both sides at the same time through the first connection part and the second connection part. The paperboards on both sides provide support for the net knot part respectively, which is conducive to improving the connection stability and reliability of the net knot part. At the same time, the net knot part pulls the paperboards on both sides at the same time. When the paperboard is subjected to impact force or extrusion force, the paperboard can transmit the force to the supporting core paper through the net knot part, which is conducive to improving the buffering energy absorption effect.

[0008] In some achievable embodiments, the supporting core paper includes a transition connection portion, and the transition connection portion is arranged between any two adjacent knot portions, and there is a distance between the transition connection portion and the paperboard.

[0009] Each net knot part is connected with a plurality of transition connection parts. When the paperboard is subjected to impact force or extrusion force, the paperboard can transmit the force to the net knot part, and then the net knot part can transmit the force to the transition connection part, so as to disperse and buffer the force.

[0010] In some achievable embodiments, the supporting core paper includes a plurality of paper strips, and the paper strips are interconnected to form a knotted portion, a hollow hole, and a transitional connection portion.

[0011] Multiple paper strips are connected to each other in sequence. Each paper strip forms a net knot at the connection. The paper strip has a simple structure and a relatively small weight, which is conducive to reducing the difficulty of processing and forming the supporting core paper and the overall weight.

[0012] In some achievable embodiments, the thickness of the paperboard is D1, and the thickness of the paper strip is D2, wherein D1>D2.

[0013] Compared with paper strips, the thickness of paperboard is relatively large, so the structural strength of paperboard itself is relatively high, which is conducive to making paperboard have good impact resistance, extrusion resistance and deformation resistance. Compared with paperboard, the thickness of paper strips is relatively small, so the overall weight of the supporting core paper itself is relatively light, which is conducive to the overall weight reduction of composite paperboard. At the same time, the material consumption of supporting core paper is relatively small, which is conducive to reducing processing costs.

[0014] In some feasible embodiments, the structure of the supporting core paper is as follows: multiple rows of longitudinal slots are arranged on the paper along the transverse direction of the paper, each row of longitudinal slots includes multiple longitudinal slots, and the longitudinal slots of two adjacent rows are arranged alternately. Along the transverse direction of the paper, the two ends of the paper are stretched, the longitudinal slots are torn open, and the paper between two adjacent longitudinal slots is twisted under the stretching action to form the supporting core paper.

[0015] The supporting core paper itself is generally relatively soft. The supporting core paper itself is usually used directly for packaging, and can cushion and cover products to facilitate product transportation. Therefore, the understanding of the supporting core paper by those skilled in the art is limited to directly packaging products to achieve a cushioning effect. In the embodiment of the present application, the supporting core paper is connected and matched with the paperboard to manufacture a composite paperboard, so that the composite paperboard can achieve the effects of weight reduction and pressure resistance. Therefore, as a raw material for a carton, the composite paperboard can achieve the effects of overall weight reduction and pressure resistance of the carton, can meet various performance requirements of existing cartons, and the production cost of the carton is low.

[0016] In some practicable ways, the supporting core paper is kraft paper, which has good flexibility, so that the supporting core paper has a stable structure and is not easily deformed, and has good supporting capacity. At the same time, the supporting core paper can be naturally degraded and will not cause pollution to the environment.

[0017] In some achievable embodiments, one of the two side paperboards is bonded to the first connecting portion, and the other is bonded to the second connecting portion.

[0018] The connection method between the paperboard and the net knot part of the supporting core paper is simple, which reduces the difficulty of connecting the paperboard and the net knot part of the supporting core paper.

[0019] In some embodiments, the paperboard is cardboard.

[0020] When the paperboard itself is subjected to external forces, the harder paperboard is less likely to collapse, deform or be damaged than the supporting core paper, which is beneficial to improving the impact and extrusion resistance of the composite paperboard.

[0021] Since the paperboards on both sides are relatively hard, only when a relatively large force is applied to the paperboards can the composite paperboard as a whole bend or break. Therefore, the carton made of the composite paperboard of the embodiment of the present application can maintain a structure that is not easily deformed and has good impact resistance and extrusion resistance.

[0022] In some practicable ways, the supporting core paper is a paper material and is an integrated three-dimensional structure, which is conducive to improving the overall structural strength of the supporting core paper and improving the overall energy buffering capacity of the supporting core paper. The supporting core paper can be integrally arranged between the two side paperboards and connected to the two side paperboards, reducing the difficulty of splicing and assembling the supporting core paper and the paperboards.

[0023] In some practicable ways, the number of cardboards is more than three, the number of supporting core papers is more than two, and the cardboards and supporting core papers are arranged alternately along the thickness direction of the cardboards. Cardboards are arranged on both sides of the supporting core paper.

[0024] The way in which multiple paperboards and multiple supporting core papers are stacked on each other makes the composite paperboard have relatively more layers, which can help improve the overall structural strength of the composite paperboard, so as to improve the pressure resistance and impact deformation resistance of the composite paperboard itself.

[0025] In some practicable embodiments, more than two supporting core papers are arranged between two adjacent paperboards, and the more than two supporting core papers are stacked along the thickness direction of the paperboards.

[0026] By arranging more than two supporting core papers between two adjacent paperboards, when the paperboard is subjected to impact force or extrusion force, the force can be dispersed and buffered by multiple supporting core papers, which is beneficial to improving the overall impact resistance of the composite paperboard.

[0027] The embodiment of the present application provides a carton, which includes the composite paperboard as described in the above embodiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0029] Figure 1 This is a schematic diagram of the structure of a composite paperboard according to an embodiment of the present application;

[0030] Figure 2 is a schematic diagram of the exploded structure of a composite paperboard according to an embodiment of the present application;

[0031] Figure 3 It is a partial structural schematic diagram of a composite paperboard according to an embodiment of the present application;

[0032] Figure 4 yes Figure 3 A schematic diagram of the local structure of the composite paperboard viewed from above along the thickness direction;

[0033] Figure 5 yes Figure 2 The enlarged schematic diagram of the M in the middle;

[0034] Figure 6 This is a schematic diagram of the structural forming process of the support core paper according to an embodiment of the present application;

[0035] Figure 7 This is a schematic diagram of the structure of a composite paperboard according to an embodiment of the present application;

[0036] Figure 8 It is a schematic structural diagram of a composite paperboard according to an embodiment of the present application.

[0037] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale.

[0038] Description of reference numerals:

[0039] 10. Composite paperboard;

[0040] 20. Cardboard;

[0041] 30, supporting core paper; 301, paper strip; 31, netting part; 311, first connecting part; 312, second connecting part; 32, hollow hole; 33, transition connecting part;

[0042] 100. Paper;

[0043] 110, longitudinal slot;

[0044] X, thickness direction;

[0045] O. Axial. DETAILED DESCRIPTION

[0046] The following detailed description and drawings of the embodiments of the present application are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0047] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0048] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0049] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0050] Figure 1 The structure of the composite paperboard 10 is schematically shown. Figure 2 The exploded structure of the composite paperboard 10 is schematically shown. Figure 3 The partial structure of the composite paperboard 10 is schematically shown. Figure 4 Schematically displayed Figure 3 The local structure of the composite paperboard 10 when viewed from above along the thickness direction X. Figure 5 Schematically displayed Figure 2 The enlarged picture of M in the middle. Figures 1 to 5 The embodiments of the present application are described.

[0051] See also Figures 1 to 4 As shown, the embodiment of the present application provides a composite paperboard 10, which includes a paperboard 20 and a supporting core paper 30. Along the thickness direction X of the paperboard 20, paperboards 20 are respectively arranged on two opposite sides of the supporting core paper 30. The supporting core paper 30 is a mesh paper. The supporting core paper 30 includes a mesh portion 31 and a hollow hole 32. The paperboards 20 on both sides are respectively connected to the mesh portion 31 of the supporting core paper 30.

[0052] The supporting core paper 30 in the composite paperboard 10 of the embodiment of the present application is a grid paper with hollow holes 32. The unit volume weight of the supporting core paper 30 itself is relatively small, which is conducive to reducing the unit volume weight of the composite paperboard 10, thereby helping to reduce the overall weight of the composite paperboard 10. The supporting core paper 30 can support the paperboards 20 on both sides, and improve the impact resistance and extrusion resistance of the paperboards 20 on both sides. When the paperboard 20 is subjected to impact force or extrusion force, the force can be dispersed and buffered by the supporting core paper 30. The supporting core paper 30 includes a plurality of mesh knots 31. A plurality of mesh knots 31 are arranged around each hollow hole 32. The paperboards 20 on both sides are respectively connected to the mesh knots 31 of the supporting core paper 30. When the paperboard 20 is subjected to impact force or extrusion force, the paperboard 20 can transmit the force to the supporting core paper 30 through the mesh knots 31, and disperse and buffer it through the supporting core paper 30. The supporting core paper 30 itself has a relatively simple structure and is easy to process and shape, which is conducive to reducing the processing cost of the composite paperboard 10.

[0053] In some possible implementations, see Figure 5As shown, the web portion 31 supporting the core paper 30 includes a first connection portion 311 and a second connection portion 312. Along the thickness direction X of the paperboard 20, the first connection portion 311 is close to the paperboard 20 on one side, and the second connection portion 312 is close to the paperboard 20 on the other side. One of the paperboards 20 on both sides is connected to the first connection portion 311, and the other is connected to the second connection portion 312.

[0054] The mesh part 31 is inclined. The first connection part 311 and the second connection part 312 of the mesh part 31 are arranged at intervals. The mesh part 31 can be connected to the paperboards 20 on both sides at the same time through the first connection part 311 and the second connection part 312. The paperboards 20 on both sides provide support for the mesh part 31 respectively, which is conducive to improving the connection stability and reliability of the mesh part 31. At the same time, the mesh part 31 pulls the paperboards 20 on both sides at the same time. When the paperboard 20 is subjected to impact force or extrusion force, the paperboard 20 can transmit the force to the supporting core paper 30 through the mesh part 31, which is conducive to improving the buffering energy absorption effect.

[0055] For some examples, see Figure 4 and Figure 5 As shown, the supporting core paper 30 includes a transition connection portion 33. The transition connection portion 33 is arranged between any two adjacent knot portions 31. There is a distance between the transition connection portion 33 and the paperboard 20.

[0056] The transition connection part 33 and the paperboard 20 may be in a non-connected state. The transition connection part 33 may be in a suspended state. Each mesh part 31 is connected to a plurality of transition connection parts 33. When the paperboard 20 is subjected to impact force or extrusion force, the paperboard 20 can transmit the force to the mesh part 31, and then the mesh part 31 can transmit the force to the transition connection part 33, thereby dispersing and buffering the force.

[0057] Exemplarily, four mesh parts 31 may be arranged around one hollow hole 32. One mesh part 31 may be connected to four transition connection parts 33.

[0058] Exemplarily, there is a gap between the transition connecting portion 33 and the paperboard 20. Different hollow holes 32 can be connected through the gap.

[0059] For some examples, see Figure 3 and Figure 5 As shown, the supporting core paper 30 includes a plurality of paper strips 301. The paper strips 301 are connected to each other to form a net knot portion 31, a hollow hole 32 and a transition connection portion 33.

[0060] The plurality of paper strips 301 are connected to each other in sequence. Each paper strip 301 forms a net knot 31 at the connection. The paper strip 301 has a simple structure and a relatively small weight, which is conducive to reducing the difficulty of processing and forming the supporting core paper 30 and the overall weight.

[0061] In some practicable embodiments, the thickness of the paperboard 20 itself is D1, and the thickness of the paper strip 301 itself is D2, wherein D1>D2.

[0062] Compared with the paper strip 301, the thickness of the paperboard 20 itself is relatively large, so the structural strength of the paperboard 20 itself is relatively high, which is conducive to making the paperboard 20 have good impact resistance, extrusion resistance, and deformation resistance. Compared with the paperboard 20, the thickness of the paper strip 301 itself is relatively small, so that the overall weight of the supporting core paper 30 itself is relatively light, which is conducive to reducing the overall weight of the composite paperboard 10. At the same time, the material consumption of the supporting core paper 30 is relatively small, which is conducive to reducing the processing cost.

[0063] In some examples, the thickness of the paperboard 20 and the thickness of the paper strip 301 satisfy: 7D2≥D1≥5D2. The thickness of each paper strip 301 can be equal, which is conducive to ensuring that the bearing performance and structural strength of each paper strip 301 are consistent.

[0064] In some examples, the supporting core paper 30 is a paper material and is an integrally formed three-dimensional structure. The thickness of the net knot portion 31 itself is the same as the thickness of the paper strip 301 itself.

[0065] In some examples, the thickness D2 of the paper strip 301 itself may range from 0.1 mm to 0.3 mm. The thickness D1 of the paperboard 20 itself may range from 0.5 mm to 2 mm. For example, the thickness D1 of the paperboard 20 itself may range from 1 mm, 1.5 mm, or 2 mm.

[0066] In some achievable ways, Figure 6 The structure forming process of the supporting core paper 30 is schematically shown. Figure 6 As shown, the structure of the supporting core paper 30 is as follows: along the transverse direction of the paper 100, a plurality of rows of longitudinal slots 110 are arranged on the paper 100, each row of longitudinal slots 110 includes a plurality of longitudinal slots 110, and the longitudinal slots 110 of two adjacent rows are arranged alternately. Along the transverse direction of the paper 100, the two ends of the paper 100 are stretched, the longitudinal slots 110 are torn open, and the paper 100 between two adjacent longitudinal slots 110 is twisted under the stretching action to form a supporting core paper 30 with a three-dimensional structure.

[0067] The supporting core paper 30 itself is generally relatively soft. The supporting core paper 30 itself is usually used directly for packaging, and can cushion and cover products for easy transportation of products. Therefore, the understanding of the supporting core paper 30 by those skilled in the art is limited to directly packaging products to achieve a cushioning effect. In the embodiment of the present application, the supporting core paper 30 is connected and matched with the paperboard 20 to manufacture the composite paperboard 10, so that the composite paperboard 10 can achieve the effects of weight reduction and pressure resistance. Therefore, as a raw material for a carton, the composite paperboard 10 can achieve the effects of overall weight reduction and pressure resistance of the carton, can meet various performance requirements of existing cartons, and the production cost of the carton is low.

[0068] In some examples, the paper 100 may be, but is not limited to, kraft paper. The thickness of the paper 100 itself may be equal to the thickness D2 of the paper strip 301 in the formed support core paper 30 .

[0069] In some practicable ways, the support core paper 30 is kraft paper. The support core paper 30 itself has good flexibility, so that the support core paper 30 itself has a stable structure and is not easily deformed, and has good supporting capacity. At the same time, the support core paper 30 can be naturally degraded and will not cause pollution to the environment.

[0070] For some examples, see Figure 5 As shown, there is an angle V between the transition connection part and the mesh part, for example, 110°≤V≤160°. Different angles V result in different bending degrees between the transition connection part 33 and the mesh part 31, so that the supporting functions that can be played are also different. Too large or too small bending degrees may cause the transition connection part 33 to lose its supporting capacity. In practice, the size of the angle V can be adjusted according to actual needs.

[0071] In some examples, the paperboard 20 is a hard paperboard. The elastic modulus of the paperboard 20 is greater than the elastic modulus of the supporting core paper 30.

[0072] The grid-shaped support core paper 30 itself is flexible. When the paperboard 20 is subjected to external forces, the support core paper 30 is relatively easy to be compressed and deformed relative to the paperboard 20, so as to effectively disperse and buffer the external forces. When the paperboard 20 itself is subjected to external forces, the relatively hard paperboard 20 is less likely to collapse, deform or be damaged relative to the support core paper 30, which is beneficial to improving the impact resistance and extrusion resistance of the composite paperboard 10.

[0073] Since the paperboards 20 on both sides are relatively hard, the composite paperboard 10 can be bent or broken as a whole only when a relatively large force is applied to the paperboard 20. Therefore, the carton made of the composite paperboard 10 of the embodiment of the present application can maintain a structure that is not easily deformed and has good impact resistance and extrusion resistance.

[0074] In some achievable methods, the support core paper 30 is a paper material and is an integrally formed three-dimensional structure, which is conducive to improving the overall structural strength of the support core paper 30 and improving the overall energy buffering capacity of the support core paper 30. The support core paper 30 can be disposed as a whole between the two side paperboards 20 and connected to the two side paperboards 20, reducing the difficulty of splicing and assembling the support core paper 30 and the paperboard 20.

[0075] In some examples, the support core paper 30 includes a paper strip 301. After the support core paper 30 is processed and formed, the paper strip 301 is formed at the same time. The integrally formed structure between each paper strip 301 can make the mesh part 31 itself an integral structure. If each paper strip 301 is a mutually spliced ​​structure, the paper strip 301 overlaps in the mesh part 31, increasing the thickness of the mesh part 31. At the same time, a connecting structure (such as glue) needs to be provided in the mesh part 31 to connect the paper strip 301, which increases the difficulty of processing and forming the support core paper 30. In addition, when the composite paperboard 10 is transported, stored or used, the paper strip 301 may be disconnected in the mesh part 31, resulting in the possibility of connection failure. In the embodiment of the present application, the support core paper 30 is integrally formed, which is conducive to solving the above technical problems. The thickness at the mesh part 31 is relatively small, and at the same time, the paper strip 301 is stably connected in the mesh part 31 and is not easy to be disconnected.

[0076] In some possible implementations, see Figure 5 As shown, the paperboards 20 on both sides do not block the hollow holes 32. The axial direction O of the hollow holes 32 is different from the thickness direction X of the paperboard 20. The axial direction O of the hollow holes 32 and the thickness direction X of the paperboard 20 form an angle.

[0077] For some examples, see Figure 5 As shown, the angle K between the axial direction O of the hollow hole 32 and the thickness direction X of the paperboard 20 is, for example, 50°≤K≤85°. Exemplarily, the angle K between the axial direction O of the hollow hole 32 and the thickness direction X of the paperboard 20 is equal to 55°, 60°, 70° or 80°. Too large or too small an angle K may result in insufficient support capacity of the supporting core paper 30. In practice, the size of the angle K can be adjusted according to actual needs.

[0078] In some examples, the support core paper 30 includes a paper strip 301. Too large or too small an angle K may result in insufficient support capacity of the paper strip 301. In practice, the size of the angle K can be adjusted according to actual needs.

[0079] In some achievable ways, Figure 7 The structure of the composite paperboard 10 is schematically shown. Figure 7As shown, the number of paperboards 20 is more than three. The number of supporting core paper 30 is more than two. Along the thickness direction X of the paperboard 20, the paperboards 20 and the supporting core paper 30 are arranged alternately. A supporting core paper 30 is arranged between two adjacent paperboards 20. Paperboards 20 are arranged on both sides of the supporting core paper 30.

[0080] The stacking of multiple paperboards 20 and multiple supporting core papers 30 makes the composite paperboard 10 have relatively more layers, which can help improve the overall structural strength of the composite paperboard 10 and improve the pressure resistance and impact deformation resistance of the composite paperboard 10 itself.

[0081] In some practicable ways, the two side paperboards 20 are arranged parallel to each other. The thickness of the paperboard 20 itself is D1. Along the thickness direction X of the paperboard 20, the vertical distance between the paperboards 20 on both sides of the supporting core paper 30 is D3. Wherein, D3>D1.

[0082] The maximum thickness of the supporting core paper 30 as a whole can be equal to the vertical spacing D3 between the paperboards 20 on both sides of the supporting core paper 30. A relatively thick supporting core paper 30 can be set between the paperboards 20 on both sides to ensure that the supporting core paper 30 has good supporting performance and deformation buffering performance. At the same time, the overall thickness of the composite paperboard 10 can be adjusted by flexibly selecting a supporting core paper 30 of appropriate thickness according to product requirements. Since the supporting core paper 30 itself is relatively light in weight, the method of adjusting the overall thickness of the composite paperboard 10 by the thickness of the supporting core paper 30 is not likely to cause the overall weight of the composite paperboard 10 to increase significantly.

[0083] In some examples, the thickness of the paperboard 20 itself is D1, and the vertical distance between the paperboards 20 on both sides of the supporting core paper 30 is D3, wherein 6D1≥D3≥4D1.

[0084] Exemplarily, the thickness D1 of the paperboard 20 itself ranges from 0.5 mm to 2 mm. For example, the thickness D1 of the paperboard 20 itself can be 1 mm, 1.5 mm, or 2 mm. The vertical spacing D3 between the paperboards 20 on both sides of the supporting core paper 30 can range from 2 mm to 12 mm. For example, the vertical spacing D3 between the paperboards 20 on both sides can be 4 mm, 7 mm, or 9 mm.

[0085] In some achievable ways, the two side paperboards 20 are respectively bonded to the net knot part 31 of the supporting core paper 30. The connection method of the paperboard 20 and the net knot part 31 of the supporting core paper 30 is simple, which reduces the difficulty of connecting the paperboard 20 and the net knot part 31 of the supporting core paper 30.

[0086] In some examples, adhesive glue or double-sided tape is provided on the paperboard 20 , and then the paperboard 20 and the supporting core paper 30 are bonded to form the composite paperboard 10 .

[0087] In some examples, one of the two side paperboards 20 is bonded to the first connection portion 311 , and the other is bonded to the second connection portion 312 .

[0088] In some achievable ways, Figure 8 The structure of the composite paperboard 10 is schematically shown. Figure 8 As shown, more than two supporting core papers 30 are arranged between two adjacent paperboards 20. Along the thickness direction X of the paperboard 20, more than two supporting core papers 30 are stacked. Each supporting core paper 30 between two adjacent paperboards 20 is connected to each other. Among each supporting core paper 30, the two supporting core papers 30 close to the outermost sides are respectively connected to the paperboards 20 on both sides.

[0089] By disposing more than two supporting core papers 30 between two adjacent paperboards 20 , when the paperboard 20 is subjected to impact force or extrusion force, the force can be dispersed and buffered by the multiple supporting core papers 30 , which is beneficial to improving the overall impact resistance of the composite paperboard 10 .

[0090] In some examples, along the thickness direction X of the paperboard 20, adjacent support core papers 30 may be connected by respective knotted parts 31. For example, adjacent support core papers 30 may be connected by bonding respective knotted parts 31.

[0091] The composite paperboard 10 of the embodiment of the present application can at least be used to replace the existing corrugated paperboard. On the basis of meeting the required performance requirements, the material cost is lower and it is more suitable for the trend of environmental protection and weight reduction.

[0092] The present application also provides a carton, which includes the composite paperboard 10 of the above embodiment. According to the size and style of the carton, the composite paperboard 10 is folded and connected to form a carton that meets product requirements.

[0093] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A composite paperboard, characterized in that: include: Paperboard and supporting core paper; Along the thickness direction of the paperboard, the paperboards are respectively arranged on opposite sides of the supporting core paper, the supporting core paper is grid paper, the supporting core paper includes a mesh part and hollow holes, and the paperboards on both sides are respectively connected to the mesh part of the supporting core paper.

2. The composite paperboard according to claim 1, characterized in that: The net-knotted portion includes a first connecting portion and a second connecting portion. Along the thickness direction of the paperboard, the first connecting portion is close to the paperboard on one side, and the second connecting portion is close to the paperboard on the other side. One of the paperboards on both sides is connected to the first connecting portion, and the other is connected to the second connecting portion.

3. The composite paperboard according to claim 2, characterized in that: The supporting core paper comprises a transition connection part, and the transition connection part is arranged between any two adjacent mesh knot parts, and there is a distance between the transition connection part and the paperboard.

4. The composite paperboard according to claim 3, characterized in that: The supporting core paper includes a plurality of paper strips, and the paper strips are interconnected to form the mesh portion, the hollow holes and the transition connection portion.

5. The composite paperboard according to claim 4, characterized in that: The thickness of the paperboard is D1, and the thickness of the paper strip is D2, wherein D1>D2.

6. The composite paperboard according to claim 3, characterized in that: The structure of the supporting core paper is as follows: along the transverse direction of the paper, a plurality of rows of longitudinal slots are arranged on the paper, each row of the longitudinal slots includes a plurality of longitudinal slots, and the longitudinal slots of two adjacent rows are arranged alternately, and along the transverse direction of the paper, the two ends of the paper are stretched, the longitudinal slots are torn, and the paper between two adjacent longitudinal slots is twisted under the stretching action to form the supporting core paper.

7. The composite paperboard according to claim 4 or 6, characterized in that: The supporting core paper is kraft paper.

8. The composite paperboard according to any one of claims 2 to 7, characterized in that: One of the paperboards on both sides is bonded to the first connecting portion, and the other is bonded to the second connecting portion.

9. The composite paperboard according to any one of claims 1 to 8, characterized in that: The paperboard is hardboard.

10. The composite paperboard according to any one of claims 1 to 9, characterized in that: The supporting core paper is made of paper material and is an integrally formed three-dimensional structure.

11. The composite paperboard according to any one of claims 1 to 10, characterized in that: The number of the paperboards is more than three, the number of the supporting core papers is more than two, and along the thickness direction of the paperboards, the paperboards and the supporting core papers are arranged alternately; and / or, More than two supporting core papers are arranged between two adjacent paperboards, and along the thickness direction of the paperboard, the more than two supporting core papers are stacked.

12. A carton, characterized in that: The composite paperboard comprises the composite paperboard according to any one of claims 1 to 11.

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