Bending-resistant composite corrugated paperboard

Abstract

This utility model discloses a bending-resistant composite corrugated cardboard, comprising a first corrugated core layer, a second corrugated core layer disposed on the upper end of the first corrugated core layer, and a reinforcing layer sandwiched between the first and second corrugated core layers. U-shaped paper-plastic composite strips are disposed around the outer four rings of the first, second, and reinforcing core layers. The first corrugated core layer includes high-grammage kraft paper, with a waterproof coating disposed on the upper end of the high-grammage kraft paper. Several corrugated sheets are evenly and equidistantly arranged on the upper end of the waterproof coating. The beneficial effects are: by adding a reinforcing layer between the first and second corrugated core layers, the overall structure of the cardboard is strengthened, enabling it to better distribute external pressure and reduce bending deformation. The reinforcing layer (such as a non-woven fabric layer) not only improves the bending resistance of the cardboard but also provides additional support, reducing bending caused by external forces during transportation and stacking.

Description

Technical Field

[0001] This utility model relates to the field of corrugated cardboard technology, and in particular to a bending-resistant composite corrugated cardboard. Background Technology

[0002] Corrugated cardboard, especially double-walled and triple-walled cardboard, is widely used in the packaging industry. The traditional corrugated cardboard structure mainly consists of face paper, core paper, and base paper. Its advantages are low cost, light weight, and recyclability, making it suitable for packaging goods in various logistics environments. However, traditional corrugated cardboard may bend, deform, or break when faced with greater external forces or during long-term transportation, resulting in a decrease in the protective performance of the packaged goods. Utility Model Content

[0003] The purpose of this invention is to solve the problem that traditional corrugated cardboard is prone to bending and deformation during transportation and stacking, especially under heavy stress. This design provides an additional support structure by adding a reinforcing layer between the first and second corrugated core layers, enhancing the cardboard's resistance to bending and reducing the probability of deformation under external forces.

[0004] This utility model achieves the above objectives through the following technical solutions:

[0005] A bend-resistant composite corrugated cardboard includes a first corrugated core layer, a second corrugated core layer on top of the first corrugated core layer, and a reinforcing layer sandwiched between the first and second corrugated core layers. U-shaped paper-plastic composite strips are arranged around the outer four rings of the first, second, and reinforcing core layers. The first corrugated core layer includes high-grammage kraft paper, with a waterproof coating on its upper end. A plurality of corrugated sheets are evenly and equidistantly arranged on the upper end of the waterproof coating. The reinforcing layer between the first and second corrugated core layers provides additional support, thereby effectively increasing the cardboard's bend resistance. The reinforcing layer disperses the impact of external forces, reducing the possibility of cardboard bending during transportation and stacking. High-grammage kraft paper itself has high compressive strength and durability, making corrugated cardboard less prone to deformation or damage when subjected to greater pressure. The waterproof coating effectively isolates moisture, preventing the corrugated cardboard from absorbing water and swelling in humid environments, thus maintaining the stability of the cardboard. This design is particularly suitable for items with high humidity that require long-term storage or transportation. The U-shaped paper-plastic composite strips set around the four outer edges of the cardboard not only enhance the edge protection of the cardboard but also improve its impact resistance. These composite strips effectively prevent damage to the cardboard from collisions or pressure during handling or stacking.

[0006] Furthermore, the reinforcing layer is a non-woven fabric layer, using polypropylene spunbond non-woven fabric. This not only effectively increases the strength and compressive strength of the cardboard, but also makes the production process more flexible. The thickness and density of the non-woven fabric can be adjusted according to different needs. The polypropylene spunbond non-woven fabric replaces nylon mesh, which can also greatly reduce manufacturing costs.

[0007] Furthermore, the first corrugated core layer and the second corrugated core layer have the same structure.

[0008] Furthermore, the first corrugated core layer, the second corrugated core layer, and the reinforcing layer are bonded together with a starch-based bio-adhesive. The combination of the waterproof coating and the starch-based bio-adhesive makes the cardboard particularly suitable for use in humid environments and widely applicable to items with high humidity that require long-term storage or transportation, such as food, chemicals, and certain industrial products.

[0009] Furthermore, the reinforcing layer is coated on both sides with a starch-based bio-adhesive. This double-sided coating of the reinforcing layer enhances the bonding effect, ensures a strong connection between the layers, and also improves the surface strength of the cardboard, reduces the risk of tearing, and further enhances the durability of the cardboard.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] 1. By adding a reinforcing layer between the first and second corrugated core layers, the overall structure of the cardboard is strengthened, enabling it to better distribute external pressure and reduce bending deformation. The reinforcing layer (such as a non-woven fabric layer) not only improves the cardboard's resistance to bending but also provides additional support, reducing bending caused by external forces during transportation and stacking.

[0012] 2. The waterproof coating effectively isolates moisture, preventing the cardboard from absorbing water and swelling in a humid environment, thus maintaining the stability of the cardboard. This is especially important for items that need to be stored or transported with high humidity (such as food, chemicals, etc.), ensuring the waterproofness of the cardboard and extending its service life.

[0013] 3. Using starch-based bio-adhesive as the adhesive not only ensures the environmental friendliness of the cardboard but also makes it biodegradable. The use of this adhesive has a smaller impact on the environment and is in line with the trend of green and sustainable development. The reinforcement layer is treated with double-sided spraying of starch-based bio-adhesive, which not only enhances the bonding effect between the layers but also improves the surface strength of the cardboard. This can effectively reduce the risk of cardboard tearing and further enhance the durability and service life of the cardboard. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the present invention;

[0015] Figure 2 This is a schematic diagram of the first corrugated core layer of this utility model.

[0016] In the diagram, 1-first corrugated core layer, 2-second corrugated core layer, 3-reinforcing layer, 4-U-shaped paper-plastic composite strip, 11-high grammage kraft paper, 12-waterproof coating, 13-corrugated paper. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Combination Figure 1-2 As shown, a type of fold-resistant composite corrugated cardboard includes a first corrugated core layer 1, a second corrugated core layer 2 disposed on the upper end of the first corrugated core layer 1, a reinforcing layer 3 sandwiched between the first corrugated core layer 1 and the second corrugated core layer 2, and U-shaped paper-plastic composite strips 4 disposed around the outer four rings of the first corrugated core layer 1, the second corrugated core layer 2, and the reinforcing layer 3. The first corrugated core layer 1 includes high-grammage kraft paper 11, a waterproof coating 12 disposed on the upper end of the high-grammage kraft paper 11, and a plurality of corrugated sheets 13 evenly and equidistantly arranged on the upper end of the waterproof coating 12. The reinforcing layer between the first and second corrugated core layers provides an additional support structure, thereby effectively increasing the cardboard's fold resistance. The addition of reinforcing layers between the layers disperses the impact of external forces, reducing the possibility of the cardboard bending during transportation and stacking. The high-grammage kraft paper itself has high compressive strength and durability, making the corrugated cardboard less prone to deformation or damage when subjected to greater pressure. The waterproof coating effectively isolates moisture, preventing the corrugated cardboard from absorbing water and swelling in humid environments, thus maintaining the stability of the cardboard. This design is particularly suitable for items with high humidity that require long-term storage or transportation. The U-shaped paper-plastic composite strips set around the four outer edges of the cardboard not only enhance the protection of the cardboard edges but also improve its impact resistance. These composite strips effectively prevent damage to the cardboard from collisions or pressure during handling or stacking.

[0019] The reinforcing layer 3 is a non-woven fabric layer made of polypropylene (PP) spunbond non-woven fabric. This not only effectively increases the strength and compressive strength of the cardboard, but also makes the production process more flexible, allowing for adjustments to the thickness and density of the non-woven fabric to meet different needs. The PP spunbond non-woven fabric replaces nylon mesh, significantly reducing manufacturing costs. The first corrugated core layer 1 and the second corrugated core layer 2 have the same structure. The first corrugated core layer 1, the second corrugated core layer 2, and the reinforcing layer 3 are bonded together using a starch-based bio-adhesive. The combination of the waterproof coating and the starch-based bio-adhesive makes this cardboard particularly suitable for use in humid environments, making it widely applicable to high-humidity items requiring long-term storage or transportation, such as food, chemicals, and certain industrial products. The reinforcing layer 3 is coated with a starch-based bio-adhesive on both sides. This double-sided coating enhances the bonding effect, ensuring a strong connection between layers. This treatment also improves the surface strength of the cardboard, reduces the risk of tearing, and further enhances the cardboard's durability.

[0020] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0021] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A bend-resistant composite corrugated cardboard, comprising a first corrugated core layer (1), characterized in that: A second corrugated core layer (2) is provided on the upper end of the first corrugated core layer (1). A reinforcing layer (3) is sandwiched between the first corrugated core layer (1) and the second corrugated core layer (2). A U-shaped paper-plastic composite strip (4) is provided on the four outer rings of the first corrugated core layer (1), the second corrugated core layer (2), and the reinforcing layer (3). The first corrugated core layer (1) includes high-grammage kraft paper (11). A waterproof coating (12) is provided on the upper end of the high-grammage kraft paper (11). Several corrugated papers (13) are evenly and equidistantly arranged on the upper end of the waterproof coating (12).

2. The anti-bending composite corrugated cardboard according to claim 1, characterized in that: The reinforcing layer (3) is a non-woven fabric layer, which is made of polypropylene (PP) spunbond non-woven fabric.

3. The anti-bending composite corrugated cardboard according to claim 2, characterized in that: The first corrugated core layer (1) and the second corrugated core layer (2) have the same structure.

4. The anti-bending composite corrugated cardboard according to claim 3, characterized in that: The first corrugated core layer (1) is bonded to the second corrugated core layer (2) and the reinforcing layer (3) using a starch-based bio-adhesive.

5. The anti-bending composite corrugated cardboard according to claim 4, characterized in that: The reinforcing layer (3) is coated on both sides using a starch-based bio-adhesive.

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