A multi-peak corrugated cardboard, its preparation method, and its application in packaging boxes.

Abstract

This invention provides a multi-peak corrugated cardboard, its preparation method, and its application in packaging boxes, relating to the field of packaging box technology. The multi-peak corrugated cardboard includes a multi-peak corrugated core board and an outer cardboard. The multi-peak corrugated core board includes several high-peak flutes and several low-peak flutes, which are distributed alternately. The peaks and valleys of each high-peak flute and each low-peak flute are in the same plane. The surface of the outer cardboard is bonded to the peak and valley positions of the multi-peak corrugated core board. The peaks of the high-peak flutes are higher than the peaks of the low-peak flutes. The peaks of the low-peak flutes are bonded to the surface of an intermediate cardboard. The intermediate cardboard has clearance grooves to avoid the high-peak flutes. The outer and intermediate cardboard are both larger than the multi-peak corrugated cardboard. When used to make packaging boxes, a high-performance paper packaging box with a flexible interior and a rigid exterior is formed, which has advantages such as low cost and good performance.

Description

Technical Field

[0001] This invention relates to the field of packaging box technology, and in particular to a multi-peak corrugated cardboard, its preparation method, and its application in packaging boxes. Background Technology

[0002] In the structure of corrugated cardboard, the face paper (also known as linerboard) is directly exposed and bears the functions of printing and appearance. Therefore, it has extremely high requirements for strength, flatness and printability. High-quality kraft paper or linerboard is often used. The raw materials are mostly long-fiber wood pulp, and the cost per gram is relatively high. The core paper (i.e., corrugated base paper) mainly supports the corrugated shape and provides cushioning performance. It is mostly made from recycled waste paper pulp, with shorter fibers and lower cost per gram.

[0003] Corrugated cardboard is classified into A-flute, B-flute, C-flute, E-flute, and F / G (micro-flute) based on the height and density of the corrugations (number of corrugations per unit length). Among them, A-flute has the largest corrugation height, while F / G has the smallest. According to the layer structure, it is classified into three-layer corrugated cardboard (two layers of face paper and one layer of corrugated paper are stacked together, also called single-flute), five-layer corrugated cardboard (three layers of face paper and two layers of corrugated paper are stacked together, also called double-flute), and seven-layer corrugated cardboard (four layers of face paper and three layers of corrugated paper are stacked together, also called triple-flute). Generally speaking, the more layers, the stronger the load-bearing capacity and internal protection of the packaging box.

[0004] Five-layer corrugated cardboard is commonly used for transport packaging of medium to heavy-duty goods such as home appliances, furniture, electronic products, food and beverages, and e-commerce logistics. To provide better cushioning performance, foam, air bags, or other fillers are usually filled between the packaged goods and the inner wall of the carton to mitigate the impact and shock resistance of the internal packaging during logistics transportation. Therefore, the cost of transport packaging using five-layer corrugated cardboard generally includes three layers of top paper, two layers of corrugated core, and fillers. Based on this, the present invention provides a packaging box that significantly reduces packaging costs, specifically involving improvements to the corrugated cardboard structure. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention proposes a corrugated multilayer cardboard that uses less material and has a lower cost.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a multi-peak corrugated cardboard, characterized in that the multi-peak corrugated cardboard includes a multi-peak corrugated core board and an outer cardboard. The multi-peak corrugated core board includes several high-peak flutes and several low-peak flutes, which are distributed alternately. The peaks and valleys of each high-peak flute and each low-peak flute are in the same plane. The surface of the outer cardboard is bonded to the peak and valley positions of the multi-peak corrugated core board. The peaks of the high-peak flutes are higher than the peaks of the low-peak flutes. The peaks of the low-peak flutes are bonded to the surface of an intermediate cardboard. The intermediate cardboard has a relief groove to avoid the high-peak flutes. The outer contours of both the outer cardboard and the intermediate cardboard are larger than the multi-peak corrugated cardboard.

[0007] Furthermore, it also includes an inner cardboard, the surface of which is bonded to the crest of the high-flying corrugation.

[0008] Furthermore, the inner edge of the clearance groove is bonded to the waist of the low-peak rib.

[0009] Alternatively, the inner edge of the clearance groove abuts against the waist of the low-peak rib.

[0010] A processing method for multi-peak corrugated cardboard, characterized by the following steps: a) preheating and humidifying the base paper used to make the multi-peak corrugated core board, and then pressing it into a wavy structure with alternating high and low peak flutes; b) applying glue evenly to the flute valleys of the low and high peak flutes, and then bonding it to the surface of the outer cardboard; c) taking the middle cardboard and cutting it to form clearance grooves; d) applying glue evenly to the flute peaks of the high peak flutes, and then bonding it to the surface of the inner cardboard to form a four-layer composite packaging cardboard; e) drying and shaping the composite packaging cardboard to obtain multi-peak corrugated cardboard.

[0011] As an application, the resulting multi-peaked corrugated cardboard is used to make packaging boxes, with the outer cardboard located on the outer side of the packaging box.

[0012] Furthermore, a three-layer corrugated cardboard, consisting of a multi-peak corrugated cardboard, an outer cardboard, and an inner cardboard, is used to make packaging boxes whose inner sides require cushioning support. The high peaks extending beyond the inner cardboard form a flexible support structure for the contents of the packaging box, while the outer cardboard is located on the outer side of the packaging box, forming a packaging box with external rigidity and internal flexibility.

[0013] Furthermore, a four-layer corrugated cardboard, consisting of a multi-peaked corrugated cardboard, an outer cardboard, a middle cardboard, and an inner cardboard, is used to make packaging boxes. The outer cardboard is located on the outer side of the packaging box, and the inner cardboard is located on the inner side of the packaging box. This structure creates a packaging box with greater external compressive strength than internal compressive strength, and both the inner and outer surfaces are flat. It also has a box structure that effectively resists external pressure and effectively cushions the contents internally.

[0014] The above methods for making packaging boxes use the same corrugated paper as traditional corrugated paper. The production process is the same: through cutting, folding, etc., cardboard parts such as flaps, ends, sides, and joints are formed, resulting in packaging boxes with internal hexahedrons or internal cylinders.

[0015] In this design, the corrugation density between the outer cardboard and the middle board is relatively high, and the middle board and the waist of the peak flutes also form abutment and adhesion, resulting in dense support. In contrast, the inner cardboard and the middle board are only supported by the peak flutes, and the spacing between the peak flutes is relatively large. Therefore, the corrugated cardboard packaging box produced by this design is a "soft inside and rigid outside" structural design, which can effectively balance protection and stability. It can prevent damage to goods during transportation and ensure that the stacked items can withstand pressure without collapsing. It is a multi-layer composite structure that differs from existing technologies.

[0016] In addition, the cost of corrugated cardboard obtained by this solution is lower, especially the material cost. Obviously, in this solution, whether it is a three-layer structure or a four-layer structure, there is only one corrugated core board, which reduces the material used of the corrugated core board, and the material used of the middle layer is also reduced due to the slotting.

[0017] Similarly, two low-peak flutes can be set on multi-peak corrugated cardboard. These two low-peak flutes have a height difference, so there are two middle cardboards. Depending on the application scenario and the characteristics of the contents, two-peak flutes, three-peak flutes, four-peak flutes, etc. can be selected. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the layer structure of multi-peak corrugated cardboard.

[0019] Figure 2 This is a schematic diagram of the composite process of two low-peak corrugated sheets.

[0020] Figure 3 An unfolded diagram of a packaging box made from multi-peaked corrugated cardboard.

[0021] Figure 4 This is a schematic diagram of a three-layer multi-peak corrugated cardboard composite (with only one low-peak flute).

[0022] Figure 5 This is a schematic diagram of a four-layer multi-peak corrugated cardboard composite (with only one low-peak flute).

[0023] Figure 6 This is a schematic diagram of the structure of the middle cardboard.

[0024] Figure 7 This is a schematic diagram of a molding die for a multi-peak corrugated core board.

[0025] Illustrations: 1. Multi-peak corrugated core board; 2. Outer cardboard; 3. Low-peak flute; 4. Middle cardboard; 5. Inner cardboard; 6. Clearance groove; 7. High-peak flute. Detailed Implementation

[0026] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0027] like Figure 1 , Figure 4 and Figure 6 As shown, the multi-peak corrugated cardboard includes a multi-peak corrugated core board 1 and an outer cardboard 2. The multi-peak corrugated core board 1 includes several high-peak flutes 7 and several low-peak flutes 3, which are distributed alternately. The peaks and valleys of each high-peak flute 7 and each low-peak flute 3 are in the same plane. The surface of the outer cardboard 2 is bonded to the peak and valley positions of the multi-peak corrugated core board 1. The peaks of the high-peak flutes 7 are higher than the peaks of the low-peak flutes 3. The peaks of the low-peak flutes 3 are bonded to the surface of an intermediate cardboard 4. The intermediate cardboard 4 has a relief groove 6 to avoid the high-peak flutes 7. The outer contours of the outer cardboard 2 and the intermediate cardboard 4 are larger than the multi-peak corrugated cardboard. The inner edge of the relief groove 6 is bonded to the waist of the low-peak flutes 3, or the inner edge of the relief groove 6 can abut against the waist of the low-peak flutes 3.

[0028] like Figure 5 As shown, it also includes an inner cardboard 5, the surface of which is bonded to the crest of the high-flute 7. The bonding described above is done with adhesive.

[0029] The processing method of multi-peak corrugated cardboard includes the following steps: a) The base paper used to make multi-peak corrugated core board 1 is preheated and humidified, and then pressed into a wavy structure with alternating peak flutes 7 and low flutes 3; b) Glue is evenly applied to the flute valleys of low flutes 3 and peak flutes 7, and then bonded to the surface of the outer cardboard 2; c) Take the middle cardboard 4 and cut it to form a relief groove 6; d) Glue is evenly applied to the flute peaks of peak flutes 7, and then bonded to the surface of the inner cardboard 5 to form a four-layer composite packaging cardboard; e) The composite packaging cardboard is dried and shaped to obtain multi-peak corrugated cardboard.

[0030] As an application, the multi-peak corrugated cardboard is made into a packaging box, with the outer cardboard 2 located on the outer side of the packaging box. The three-layer corrugated cardboard formed by the multi-peak corrugated cardboard, the outer cardboard 2, and the middle cardboard 4 is used to make packaging boxes whose inner side requires cushioning support. The high peaks 7 extending beyond the middle board form a flexible support structure for the contents of the packaging box. The outer cardboard 2 is located on the outer side of the packaging box, forming a packaging box with external rigidity and internal flexibility.

[0031] A four-layer corrugated cardboard, consisting of multi-peaked corrugated cardboard, an outer cardboard 2, a middle cardboard 4, and an inner cardboard 5, is used to make packaging boxes. The outer cardboard 2 is located on the outer side of the packaging box, and the inner cardboard 5 is located on the inner side of the packaging box. This structure creates a packaging box with greater external compressive strength than internal compressive strength, and both the inner and outer surfaces are flat. It also has a box structure that effectively resists external pressure and effectively cushions the contents inside.

[0032] The above methods for making packaging boxes use the same corrugated paper as traditional corrugated paper. The production process is the same: through cutting, folding, etc., cardboard parts such as flaps, ends, sides, and joints are formed, resulting in packaging boxes with internal hexahedrons or internal cylinders.

[0033] In this design, the corrugation density between the outer cardboard 2 and the middle board is relatively high, and the middle board and the waist of the peak flute 7 also form abutment and adhesion, resulting in dense support. In contrast, the inner cardboard 5 and the middle board are only supported by the peak flute 7, and the spacing between the peak flutes 7 is relatively large. Therefore, the corrugated cardboard packaging box produced by this design is a "soft inside and rigid outside" structural design, which can effectively balance protection and stability. It can prevent damage to goods during transportation and ensure that the stacked items can withstand pressure without collapsing. It is a multi-layer composite structure that differs from existing technologies.

[0034] In addition, the cost of corrugated cardboard obtained by this solution is lower, especially the material cost. Obviously, in this solution, whether it is a three-layer structure or a four-layer structure, there is only one corrugated core board, which reduces the material used of the corrugated core board, and the material used of the middle layer is also reduced due to the slotting.

[0035] Similarly, two low-peak flutes 3 can be set on multi-peak corrugated cardboard, and these two low-peak flutes 3 have a height difference, such as... Figure 2 and Figure 3 As shown, there are two intermediate cardboard pieces 4. Two-peaked, three-peaked, and four-peaked corrugations can also be selected based on the application scenario and the characteristics of the built-in components.

[0036] It should be noted that the multi-peak corrugated core board 1 in this type of multi-peak corrugated cardboard can be formed by thermoforming with a mold or by roller pressing. Under the conditions of humidity and temperature, it is similar to the traditional single-peak corrugated core board, except that the teeth on the two rollers need to be adapted to the multi-peak structure. To avoid jamming of the two rollers, the height difference between the low-peak flute 3 and the high-peak flute 7 should not be too high. If the height difference is too large, thermoforming is required through a non-continuous feeding mold, including a bottom mold and a top mold. The bottom mold is flat, and its surface has a corrugated multi-peak structure. The top mold has a slightly curved surface, and its outer surface also has a corrugated structure adapted to the multi-peak structure. The base paper is placed on the bottom mold, and the middle of the top mold is pressed down and tilted back and forth slightly with the curvature to achieve thermoforming. Figure 7 As shown.

[0037] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A multi-peak corrugated cardboard, characterized in that, The multi-peak corrugated cardboard includes a multi-peak corrugated core board (1) and an outer cardboard (2). The multi-peak corrugated core board (1) includes several high peak flutes (7) and several low peak flutes (3). The high peak flutes (7) and low peak flutes (3) are distributed alternately. The peaks and valleys of each high peak flute (7) and each low peak flute (3) are in the same plane. The surface of the outer cardboard (2) is bonded to the peak and valley positions of the multi-peak corrugated core board (1). The peaks of the high peak flutes (7) are higher than the peaks of the low peak flutes (3). The peaks of the low peak flutes (3) are bonded to the surface of an intermediate cardboard (4). An avoidance groove (6) is provided on the intermediate cardboard (4) to avoid the high peak flutes (7). The outer contours of the outer cardboard (2) and the intermediate cardboard (4) are both larger than the multi-peak corrugated cardboard.

2. The multi-peak corrugated cardboard according to claim 1, characterized in that, It also includes an inner cardboard (5), the surface of which is bonded to the peak position of the high-flying corrugation (7).

3. The multi-peak corrugated cardboard according to claim 1, characterized in that, The inner edge of the clearance groove (6) is bonded to the waist of the low peak rib (3).

4. The multi-peak corrugated cardboard according to claim 1, characterized in that, The inner edge of the clearance groove (6) abuts against the waist of the low peak rib (3).

5. A method for preparing multi-peak corrugated cardboard as described in any one of claims 1 to 4, characterized in that, The process includes the following steps: a) The base paper used to make the multi-peak corrugated core board (1) is preheated and humidified and then pressed into a wavy structure with alternating peak flutes (7) and low flutes (3); b) Glue is applied evenly to the flute valleys of the low flutes (3) and peak flutes (7), and then it is bonded to the surface of the outer cardboard (2); c) Take the middle cardboard (4) and cut it to form a relief groove (6); d) Glue is applied evenly to the flute peaks of the peak flutes (7), and then it is bonded to the surface of the inner cardboard (5) to form a four-layer composite packaging cardboard; e) The composite packaging cardboard is dried and shaped to obtain the multi-peak corrugated cardboard.

6. An application of multi-peak corrugated cardboard, characterized in that, The multi-peak corrugated cardboard of any one of claims 1 to 5 is used to make a packaging box, with the outer cardboard (2) located on the outer side of the packaging box.

7. The application of the multi-peak corrugated cardboard according to claim 6, characterized in that, The three-layer corrugated cardboard formed by the multi-peak corrugated cardboard, the outer cardboard (2) and the middle cardboard (4) is used to make packaging boxes that require cushioning support on the inner side of the box. The high peaks (7) that extend beyond the middle board form a flexible support structure for the contents of the packaging box. The outer cardboard (2) is located on the outer side of the packaging box, forming a packaging box with external rigidity and internal flexibility.

8. The application of the multi-peak corrugated cardboard according to claim 6, characterized in that, Four-layer corrugated cardboard, consisting of multi-peak corrugated cardboard, outer cardboard (2), middle cardboard (4) and inner cardboard (5), is used to make packaging boxes. The outer cardboard (2) is located on the outer side of the packaging box, and the inner cardboard (5) is located on the inner side of the packaging box.

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