Ultra-light high-strength corrugated paperboard

Abstract

The application relates to an ultralight high-strength corrugated paperboard, and relates to the technical field of the corrugated paperboard, which comprises a paperboard body, the paperboard body comprises two support plates, the surfaces of the two support plates are attached with adhesive layers, a support grid is attached between the two adhesive layers, one end of one support plate away from the adhesive layer is fixedly connected with a first support core paper, one end of the first support core paper away from the support plate is fixedly connected with a first paperboard, and one end of the other support plate away from the adhesive layer is fixedly connected with a second support core paper. The application has the effects that the support grid, the first support core paper and the second support core paper are arranged, the compression resistance and the bending resistance of the paperboard are improved without increasing the thickness and the weight, the paperboard has high strength while keeping a relatively light weight, the transportation cost is reduced in actual logistics application, and the loss caused by package deformation or damage is reduced.

Description

Technical Field

[0001] This application relates to the technical field of corrugated cardboard, and in particular to an ultralight high-strength corrugated cardboard. Background Technology

[0002] Corrugated cardboard, as a core material in the modern packaging industry, is widely used due to its advantages such as being lightweight, recyclable, and low-cost. In recent years, with the rapid development of e-commerce and logistics industries, higher requirements have been placed on the strength, weight, and environmental performance of corrugated cardboard.

[0003] However, existing corrugated cardboard mainly increases strength by increasing the thickness of the paper layers. Increasing the thickness of the paper layers means that more materials need to be used, which not only increases manufacturing costs but also increases the overall weight of the corrugated cardboard, thereby increasing transportation energy consumption and logistics costs. Utility Model Content

[0004] The purpose of this application is to provide an ultra-lightweight and high-strength corrugated cardboard with advantages such as ultra-lightweight and high strength. This solves the problem that existing corrugated cardboard mainly increases strength by increasing the thickness of the paper layer. Increasing the thickness of the paper layer means that more materials need to be used, which not only increases the manufacturing cost, but also increases the overall weight of the corrugated cardboard, thereby increasing transportation energy consumption and logistics costs.

[0005] The ultra-lightweight high-strength corrugated cardboard provided in this application adopts the following technical solution: it includes a cardboard body, the cardboard body includes two support plates, both of the support plates are bonded with adhesive layers, a support grid is bonded between the two adhesive layers, a first support core paper is fixedly connected to the end of one support plate away from the adhesive layer, a first cardboard is fixedly connected to the end of the first support core paper away from the support plate, a second support core paper is fixedly connected to the end of the other support plate away from the adhesive layer, and a second cardboard is fixedly connected to the end of the second support core paper away from the support plate.

[0006] By adopting the above technical solution, a support grid is bonded between two support plates using an adhesive layer. This grid effectively and evenly distributes local impact force across the entire board surface, forming a stable support structure. Simultaneously, a first support core paper and a second support core paper are connected to the outer sides of the two support plates, working in conjunction with the first and second cardboard sheets as an outer protective layer. The first and second support core papers form a multi-level buffer structure. When the cardboard is impacted, the impact force is transmitted and diffused step-by-step through the first and second support core papers, preventing stress concentration in a localized area and thus improving the overall impact resistance of the cardboard, preventing deformation and breakage. Through the support grid and the arrangement of the first and second support core papers, the cardboard's compression and bending resistance are improved without increasing thickness or weight. This results in high strength while maintaining a relatively light weight, reducing transportation costs in practical logistics applications and minimizing losses caused by packaging deformation or damage.

[0007] Preferably, the end of the second paperboard away from the second support core paper is coated with a water-based abrasion-resistant coating. By adopting the above technical solution, a water-based abrasion-resistant coating is sprayed on the side of the second cardboard away from the second support core paper, so that the coating forms a protective film on the surface of the cardboard. When the items inside the packaging come into contact with and rub against the second cardboard, the wear of the items on the surface of the cardboard can be reduced, and the cardboard can be prevented from being damaged due to friction during transportation.

[0008] Preferably, the side of the first cardboard away from the first supporting core paper is coated with a polyurethane waterproof coating, the polyurethane waterproof coating being located on the outer side of the cardboard body, and a plurality of anti-collision strips arranged in a linear array are fixedly connected to the surface of the first cardboard.

[0009] By adopting the above technical solution, a waterproof membrane can be formed on the outside of the cardboard by spraying polyurethane waterproof coating on the side of the first cardboard away from the first supporting core paper. This membrane prevents rainwater and moisture from penetrating the inside of the cardboard and avoids the cardboard from softening due to moisture, which would reduce its strength. The polyurethane waterproof coating sprayed on the outside of the cardboard body can directly block rainwater and moisture from penetrating, preventing the cardboard from softening due to moisture and reducing its strength. At the same time, anti-collision strips are fixed in a straight array on the surface of the first cardboard. When the cardboard is hit by a collision or impact, the anti-collision strips will first come into contact with the external force and disperse the impact.

[0010] Preferably, the first supporting core paper is wavy and the second paperboard is trapezoidal.

[0011] By adopting the above technical solution, the first supporting core paper is designed with a wavy bending structure. When the paperboard is under pressure, the wavy convex and concave shapes can use the structural toughness to buffer the impact force and avoid excessive local stress leading to damage. At the same time, the second supporting core paper is set with a trapezoidal bending shape. The trapezoidal structure itself has better stability and can further help to disperse the impact force on the paperboard. The cooperation between the first and second supporting core papers can improve the compression resistance and bending resistance of the paperboard while maintaining its lightness, making it better suited for various packaging scenarios.

[0012] Preferably, the first support core paper is fixedly bonded between the support plate and the first cardboard using starch adhesive, and the second support core paper is fixedly bonded between another support plate and the second cardboard using starch adhesive.

[0013] By adopting the above technical solution, the first support core paper is fixed between the support plate and the first cardboard using starch adhesive. At the same time, the second support core paper is bonded between another support plate and the second cardboard using starch adhesive. The starch adhesive can tightly adhere to the paper substrate, allowing the first and second support core papers to adhere between the first cardboard, the second cardboard, and the support plate, forming a solid overall structure and preventing interlayer detachment during transportation or use.

[0014] Preferably, the water-based abrasion-resistant coating is located on the inner side of the cardboard body.

[0015] By adopting the above technical solution, water-based abrasion-resistant coating is sprayed onto the inner side of the cardboard body, allowing it to directly contact the items inside the packaging, resisting the wear caused by friction of the items, and preventing damage to the inner side of the cardboard.

[0016] Preferably, the two adhesive layers are modified waterborne polyurethane adhesives, and both the first and second paperboards are high-strength kraft paper.

[0017] By adopting the above technical solution and selecting modified water-based polyurethane adhesive as the bonding layer, its good bonding performance allows the support plate and the support grid to be bonded more tightly and firmly, making it less likely to delaminate or separate, thus ensuring the stability of the middle support structure of the cardboard. At the same time, the first and second cardboards are made of high-strength kraft paper, which has high toughness and load-bearing capacity. As the outer layer of the cardboard, it can further improve the overall tear resistance of the cardboard body.

[0018] Preferably, the support mesh is made of glass fiber material.

[0019] By adopting the above technical solution and using glass fiber material to make the support grid, the inherent strength and light weight of the material are utilized to form a stable central support structure without significantly increasing the overall weight of the cardboard. Combined with the support plates on both sides and the support core paper, the overall strength of the cardboard is further improved.

[0020] In summary, this application includes at least one of the following beneficial technical effects: This ultra-lightweight, high-strength corrugated cardboard utilizes a modified water-based polyurethane adhesive to bond a support grid made of glass fiber between two support boards. This is combined with a corrugated first support core and a trapezoidally bent second support core, which are then bonded to the first and second cardboard sheets using starch adhesive. This multi-level support and cushioning structure evenly distributes external forces, preventing localized stress concentration and subsequent damage. It enhances compression and impact resistance without significantly increasing weight or thickness, achieving both lightweight and high strength. Furthermore, a water-based abrasion-resistant coating on the inside of the cardboard resists friction wear, while a polyurethane waterproof coating on the outside prevents moisture intrusion. Combined with anti-collision strips on the surface of the first cardboard, these strips further cushion impacts, providing comprehensive protection against abrasion, moisture, and impact. This makes it suitable for various scenarios such as logistics transportation and packaging of various goods, reducing packaging damage and transportation losses. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this application; Figure 2 This is a schematic diagram of the intermediate support layer structure of this application. Figure 3 This is a schematic diagram of the core paper structure of this application; Figure 4 This is a cross-sectional view of the overall structure of this application; Figure 5 This is a schematic diagram of the second cardboard structure of this application.

[0022] In the picture: 1. Cardboard body; 2. Water-based abrasion-resistant coating; 3. Polyurethane waterproof coating; 4. Anti-collision strip; 101. Support plate; 102. Adhesive layer; 103. Support grid; 104. First support core paper; 105. First cardboard; 106. Second support core paper; 107. Second cardboard. Detailed Implementation

[0023] The following is in conjunction with the appendix Figure 1 -Appendix Figure 5 This application will be described in further detail below.

[0024] Example 1: An ultralight high-strength corrugated cardboard, referring to... Figure 1 , Figure 2 and Figure 3 The system includes a cardboard body 1, which includes two support plates 101. Each support plate 101 has an adhesive layer 102 bonded to its surface, and a support grid 103 is bonded between the two adhesive layers 102. By bonding the support grid 103 between the two support plates 101 using the adhesive layers 102, the grid effectively and evenly distributes localized impact forces across the entire board surface, forming a stable support structure. A first support core paper 104 is fixedly connected to the end of one support plate 101 away from the adhesive layer 102. The first support core paper 104 is used to buffer impact forces through its own structure. A first cardboard 105 is fixedly connected to the end of the first support core paper 104 away from the support plate 101. The other support plate 101... A second support core paper 106 is fixedly connected to the end away from the adhesive layer 102. The second support core paper 106 is used to improve the stability of the cardboard body 1. A second cardboard 107 is fixedly connected to the end of the second support core paper 106 away from the support plate 101. The first support core paper 104 and the second support core paper 106 form a multi-level buffer structure. When the cardboard is impacted, the impact force is transmitted and diffused to the entire cardboard through the first support core paper 104 and the second support core paper 106, avoiding stress concentration in a local area of ​​the cardboard, thereby improving the overall impact resistance of the cardboard and preventing deformation and breakage of the cardboard. The compression resistance and bending resistance of the cardboard are improved without increasing the thickness and weight.

[0025] Example 2: An ultralight high-strength corrugated cardboard, referring to... Figure 3 , Figure 4 and Figure 5 The end of the second cardboard 107 away from the second supporting core paper 106 is sprayed with a water-based abrasion-resistant coating 2. By spraying the water-based abrasion-resistant coating 2 on the side of the second cardboard 107 away from the second supporting core paper 106, a protective film is formed on the surface of the cardboard. When the items inside the packaging come into contact with and rub against the second cardboard 107, the wear on the surface of the cardboard can be reduced, and the cardboard can be prevented from being damaged due to friction during transportation. The side of the first cardboard 105 away from the first supporting core paper 104 is sprayed with a polyurethane waterproof coating 3. The polyurethane waterproof coating 3 is located on the outside of the cardboard body 1. Multiple [other components] are fixedly connected to the surface of the first cardboard 105. The anti-collision strips 4 arranged in a linear array form a waterproof membrane on the outer side of the first cardboard 105 away from the first supporting core paperboard 104 by spraying polyurethane waterproof coating 3. This membrane prevents rainwater and moisture from penetrating the cardboard and avoids it from softening due to moisture, which would reduce its strength. The polyurethane waterproof coating 3, sprayed on the outer side of the cardboard body 1, directly blocks rainwater and moisture from penetrating, preventing the cardboard from softening due to moisture and reducing its strength. Simultaneously, the anti-collision strips 4, fixed in a linear array on the surface of the first cardboard 105, ensure that when the cardboard is subjected to collision or impact, the anti-collision strips 4 first contact the external force and disperse the impact. Reference Figure 1 , Figure 3 and Figure 4 The first support core 104 is designed with a wavy bend, and the second support core 106 is designed with a trapezoidal bend. By designing the first support core 104 with a wavy bend structure, when the cardboard is subjected to pressure, the wavy convex and concave shapes can utilize the structural toughness to buffer the impact force, preventing excessive local stress from causing damage. At the same time, setting the second support core 106 with a trapezoidal bend shape, the trapezoidal structure itself has better stability, which can further help to disperse the impact force on the cardboard. The cooperation between the first support core 104 and the second support core 106 allows the cardboard to maintain its lightweight while improving its compression resistance and bending resistance, better adapting to various packaging scenarios. The first support core 104 is made of starch. The first support core 104 is fixed between the support plate 101 and the first cardboard 105 using adhesive, and the second support core 106 is fixed between the other support plate 101 and the second cardboard 107 using starch adhesive. The first support core 104 is fixed between the support plate 101 and the first cardboard 105 using starch adhesive, while the second support core 106 is fixed between the other support plate 101 and the second cardboard 107 using starch adhesive. The starch adhesive tightly adheres to the paper substrate, ensuring that the first and second support cores 104 and 106 are bonded between the first cardboard 105, the second cardboard 107, and the support plate 101, forming a robust overall structure and preventing interlayer detachment during transportation or use. Reference Figure 1 , Figure 2 and Figure 4 The water-based abrasion-resistant coating 2 is located on the inner side of the cardboard body 1. By spraying the water-based abrasion-resistant coating 2 onto the inner side of the cardboard body 1, it can directly contact the items inside the packaging, resisting wear caused by friction and preventing damage to the inner side of the cardboard. The two adhesive layers 102 are modified water-based polyurethane adhesives. The first cardboard 105 and the second cardboard 107 are both high-strength kraft paper. By using modified water-based polyurethane adhesives as adhesive layers 102, their good adhesion performance allows the support plate 101 and the support grid 103 to adhere more tightly and firmly, making it less prone to delamination and separation, thus ensuring the support of the cardboard in the middle. The structure is stable. The first cardboard 105 and the second cardboard 107 are made of high-strength kraft paper. High-strength kraft paper has high toughness and load-bearing capacity. As the outer layer of the cardboard, it can further improve the overall tear resistance of the cardboard body 1. The support grid 103 is made of glass fiber material. By using glass fiber material to make the support grid 103, the inherent characteristics of the material itself are strong and lightweight. The support grid 103 forms a stable middle support structure without significantly increasing the overall weight of the cardboard. Together with the support plates 101 on both sides and the support core paper, it further improves the overall strength of the cardboard.

[0026] The implementation principle of this application embodiment is as follows: The cardboard body 1 is based on two support plates 101, with a support grid 103 made of glass fiber bonded in the middle through an adhesive layer 102 of modified water-based polyurethane adhesive. Due to the strong and lightweight nature of glass fiber, localized stress can be evenly distributed throughout the entire cardboard body 1, avoiding structural deformation or damage caused by stress concentration at a single point. The outer sides of the two support plates 101 are respectively fixed with starch adhesive to a wavy first support core paper 104 and a trapezoidal bent second support core paper 106. When subjected to pressure or impact, the wavy structure utilizes its own toughness to achieve elastic cushioning, while the trapezoidal structure enhances the bending resistance of the cardboard body 1 due to its increased stability. The two work together to form a multi-level cushioning system, allowing the cardboard to possess excellent compression resistance without increasing its thickness or weight. For impact resistance, the first cardboard 105 and the second cardboard 107 are made of high-strength kraft paper as the outer layer. With their good toughness, they provide basic protection for the cardboard body 1. Combined with the strong bonding effect of modified water-based polyurethane adhesive and starch adhesive, they ensure that the structure of each layer is tightly bonded, avoiding delamination or separation during transportation or use, and ensuring the stability of the cardboard body 1. At the same time, the water-based abrasion-resistant coating 2 on the inside of the cardboard comes into direct contact with the contents of the packaging and is used to resist the friction of objects on the inside of the cardboard. The polyurethane waterproof coating 3 on the outside forms a waterproof film to block the intrusion of external moisture and prevent the cardboard body 1 from becoming damp and soft. The anti-collision strip 4 on the surface of the first cardboard 105 first contacts the external force and disperses the impact energy when a collision occurs, so that the cardboard reduces packaging damage and loss of goods in logistics transportation, product packaging and other scenarios.

Claims

1. A type of ultralight high-strength corrugated cardboard, comprising a cardboard body (1), characterized in that: The cardboard body (1) includes two support plates (101), each of which has an adhesive layer (102) attached to its surface. A support grid (103) is attached between the two adhesive layers (102). A first support core paper (104) is fixedly connected to one end of one support plate (101) away from the adhesive layer (102). A first cardboard (105) is fixedly connected to one end of the first support core paper (104) away from the support plate (101). A second support core paper (106) is fixedly connected to one end of the other support plate (101) away from the adhesive layer (102). A second cardboard (107) is fixedly connected to one end of the second support core paper (106) away from the support plate (101).

2. The ultralight high-strength corrugated cardboard according to claim 1, characterized in that: The end of the second cardboard (107) away from the second support core paper (106) is sprayed with a water-based abrasion-resistant coating (2).

3. The ultralight high-strength corrugated cardboard according to claim 1, characterized in that: The first cardboard (105) is coated with polyurethane waterproof coating (3) on the side away from the first support core paper (104). The polyurethane waterproof coating (3) is located on the outside of the cardboard body (1). A plurality of anti-collision strips (4) arranged in a straight line array are fixedly connected to the surface of the first cardboard (105).

4. The ultralight high-strength corrugated cardboard according to claim 1, characterized in that: The first support core paper (104) is wavy and the second support core paper (106) is trapezoidal.

5. The ultralight high-strength corrugated cardboard according to claim 1, characterized in that: The first support core paper (104) is fixedly bonded between the support plate (101) and the first cardboard (105) by starch adhesive, and the second support core paper (106) is fixedly bonded between another support plate (101) and the second cardboard (107) by starch adhesive.

6. The ultralight high-strength corrugated cardboard according to claim 2, characterized in that: The water-based abrasion-resistant coating (2) is located on the inside of the cardboard body (1).

7. The ultralight high-strength corrugated cardboard according to claim 1, characterized in that: The two adhesive layers (102) are modified waterborne polyurethane adhesives, and the first paperboard (105) and the second paperboard (107) are both high-strength kraft paper.

8. The ultralight high-strength corrugated cardboard according to claim 1, characterized in that: The support grid (103) is made of glass fiber.

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